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This study proposed a novel electrochemical sensor for the sensitive measurement of the eye medication ofloxacin (OFX), which is based on a NiO@C-dot nanocomposite. The NiO@C-dot nanocomposite was synthesized using the sol-gel method, which was then applied to alter a glassy carbon electrode (GCE). With regard to OFX, the modified GCE shown outstanding electrochemical activity along with good sensitivity, selectivity, and stability. With OFX concentrations ranging from 5 µM to 975 µM, the NiO@C-dot/GCE showed a linear relationship with a sensitivity of 0.63994 µA/µM. The limit of detection (LOD) was 0.023 µM. The response to 50 µM OFX was measured, and the electrode was stored at 4°C after each test in order to evaluate the sensor's long-term stability and repeatability. After 20 days, the peak current response was still 97.89 % of its initial value. After 40 days of prolonged storage, 93.78 % of the electrode's original responsiveness was retained. The sensor showed a recovery rate of 97.37–99.70 % in all sample types when it was used to detect OFX in human urine, tap water, and food samples. These findings highlight the NiO@C-dot/GCE's outstanding selectivity, dependability, and longevity as solid platforms for OFX detection in complicated samples for a range of applications. [ABSTRACT FROM AUTHOR]

The exponential advancement of science and technology, especially within the realm of nanotechnology, has significantly expanded the applications of metal and metal oxide nanoparticles across various industrial sectors, scientific domains, and research institutions. Nickel oxide nanoparticles, in particular, have garnered considerable interest due to their unique characteristics and versatile applications. This paper comprehensively reviews NiO NPs, emphasizing their biological synthesis methods, characterization techniques, and wide‐ranging biomedical applications. These applications include their efficacy against fungal, bacterial, and viral infections, anticancer properties, and potential as innovative therapeutic agents for numerous diseases. Our findings underscore the novelty of NiO NPs in enhancing therapeutic strategies and expanding their biomedical applications, paving the way for innovative medical interventions.The objective of this review is to elucidate a thorough overview of the current research landscape, highlight recent developments, and explore the potential future directions for NiO NPs. [ABSTRACT FROM AUTHOR]

Due to the unique properties of modern nanomaterials, many companies design complex electronic devices that are used in the aviation and space spheres to assemble powerful computers, video equipment, help diagnose various diseases, as well as quickly transmit information. Such nanostructured materials are obtained by embedding nanoparticles into various polymer matrices. The effect of nickel oxide nanoparticles (NiONPs) stabilized by a matrix of high-pressure polyethylene (LDPE) obtained by the mechanochemical method on the structure and properties of nanocomposites based on high-pressure polyethylene (LDPE) containing multiwalled carbon nanotubes (MWCNT) has been studied. The physical-mechanical, thermophysical and thermal properties of the obtained composites were studied using DTA and AFM analysis methods. The optimal composition of components for obtaining nanocomposites with improved properties has been determined. Shown that small amounts of nanofillers introduced into the polymer play the role of structure formers - artificial crystallization nuclei, which contributes to the appearance of a fine spherulite structure in the polymer. AFM micrographs show the complex interweaving of nanoparticles with each other and the polymer matrix and the formation of a new fine-crystalline supramolecular structure related to the interfacial interaction of nickel-containing nanoparticles with multilayer carbon nanotubes, which contributes to the maximum increase in the physical-mechanical and thermal properties of the resulting nanocomposite. [ABSTRACT FROM AUTHOR]

Abstract—The effect of nanofiller (NF) additives containing nickel oxide nanoparticles (NPs) stabilized by a polymer matrix of high-pressure polyethylene (PE) obtained by the mechanochemical method on the peculiarities of the structure and properties of metal-containing nanocomposites based on isotactic polypropylene (PP) and high-pressure polyethylene (PE) is studied. Differential thermal analysis (DTA), X-ray diffraction (XRD), and scanning electron microscopy (SEM) are used. Improvement of the strength, deformation, and rheological parameters as well as thermo-oxidative stability of the obtained nanocomposites is found. This is apparently associated with the synergistic effect of the interfacial interaction of nickel-containing nanoparticles in the PE matrix with the components of the PP/PE polymer composition. It is shown that nanocomposites based on PP/PE/NF can be processed by both the method of pressing and the methods of injection molding and extrusion, which expands the scope of their application. [ABSTRACT FROM AUTHOR]

Although the production and use of nickel oxide nanoparticles (NiONP) are widespread, environmental and public health problems are associated with it. The kidney is the primary organ in excretion and is among the target organs in nanoparticle toxicity. This study aimed to compare the renal toxicity of nickel oxide (NiO) microparticles and nickel oxide nanoparticles by different routes of administration, such as oral, intraperitoneal (IP), and intravenous (IV). Seven groups were formed, with 42 male rats and six animals in each group. NiO oral (150 mg/kg), NiO IP (20 mg/kg), NiO IV (1 mg/kg), NiONP oral (150 mg/kg), NiONP IP (20 mg/kg), and NiONP IV (1 mg/kg) was administered for 21 days. After NiO and NiONP administration, a decrease in antioxidant activities and an increase in lipid peroxidation occurred in the kidney tissue of rats. Increased kidney urea, uric acid, and creatinine levels were observed. Inhibition of acetylcholinesterase activity and an increase in interleukin 1 beta were detected. Apoptotic markers, Bax, caspase-3, and p53 up-regulation and Bcl-2 down-regulation were observed. In addition, histopathological changes occurred in the kidney tissue. In general, it was observed that nickel oxide microparticles and nickel oxide nanoparticles cause inflammation by causing oxidative stress in the kidney tissue, and NiONP IV administration is more effective in renal toxicity. [ABSTRACT FROM AUTHOR]

NiO nanoparticles have garnered significant interest due to their diverse applications and unique properties, which differ markedly from their bulk counterparts. NiO nanoparticles are p-type semiconductors with a wide bandgap, high discharge capacity, and high carrier density, making them ideal for use in batteries, sensors, and catalysts. Their ability to generate reactive oxygen species also imparts disinfectant and antibiotic properties. Additionally, the higher Néel temperature of NiO compared with other antiferromagnetic materials makes it suitable for high-temperature applications in spintronic devices and industrial settings. This review focuses on the critical role of structure and composition in determining the magnetic properties of NiO nanoparticles. It examines how finite-size surface effects, morphology, crystallinity, and nickel distribution influence these properties. Fundamental physical properties and characterization techniques are discussed first. Various synthesis methods and their impact on NiO nanoparticle properties are then explored. Their magnetic phenomenology is examined in detail, highlighting the effects of finite size, particle composition and surface, and crystal quality. The review concludes with a summary of key insights and future research directions for optimizing NiO nanoparticles in technological applications. [ABSTRACT FROM AUTHOR]

The present study validates the impact of nickel oxide nanoparticles (NiONPs) biosynthesized from the brown seaweed Dictyota bartayresiana (DB) and its biological applications. The phytochemicals analyzed in the seaweed extract served as a reducing, capping or stabilizing agent in the formation of nanoparticles. UV visible spectrum of nickel oxide nanoparticles synthesized from DB (DB-NiONPs) represented a prominent peak at 392 nm which validates its formation. Fourier Transmission Infrared Spectroscopy (FT-IR) showcased the presence of functional groups in the biomolecules which aids in the stabilization of DB-NiONPs. The X-ray diffractometry (XRD) revealed the crystalline nature of DB-NiONPs and the particle size was calculated as 18.26 nm. The Scanning electron microscope (SEM) illustrates the irregularly shaped DB-NiONPs and the desired elements were depicted in energy dispersive X-ray (EDX) spectrum which confirms the purity of DB-NiONPs. The DB-NiONPs efficiently decolorised the Black B133 (BB133) dye to 86% in 25 min. The data of adsorption studies well fitted into Langmuir isotherm and pseudo-second order kinetic model. The thermodynamic study substantiated the spontaneous, feasible and endothermic process of adsorption. DB-NiONPs revealed enhanced antimicrobial, larvicidal and nematicidal activities against the selected microbes, larva of Culex pipens and juveniles of Meloidogyne incognita respectively. The phytotoxicity studies revealed the DB-NiONPs had a positive impact on the germination and growth of green gram seedlings. [ABSTRACT FROM AUTHOR]

This work reports on the synthesis of a unique nickel oxide/carboxylated reduced graphene oxide (NiO/c-rGO) nanocomposites electrochemical sensor for the detection of quercetin (QCT). The successful integration of NiO nanoparticles into the c-rGO matrix was confirmed by the characterization and synthesis of both the NiO nanoparticles and c-rGO. After that, the glassy carbon electrode (GCE) was treated with the NiO/c-rGO nanocomposite, which produced a modified GCE with improved electrochemical characteristics. The NiO/c-rGO modified GCE showed a wide linear-range of 0.5 to 750 µM and a low detection limit of 0.016 µM, indicating high sensitivity towards QCT. Additionally, the sensor exhibited excellent selectivity, with very little interference from examined kinds of analytes, both organic and inorganic. Additionally, the sensor's long-term stability was demonstrated by its steady redox reaction to QCT, with a sensitivity of roughly 96.68% over a 33-day period. The suggested sensor's use was evaluated by measuring differential pulse voltammetry on real samples, including onions, apple juice, honey, and green tea. These samples' QCT recovery rates, which varied from 96.00 to 99.40%, showed the precision, dependability, and potency of the suggested sensor. Based on these results, the NiO/c-rGO nanocomposite may be a great material to use in the creation of stable, highly sensitive, and selective electrochemical sensors for QCT detection. The food, pharmaceutical, and clinical diagnostics industries might all benefit greatly from this. This work enhances the field of electrochemical sensor technology and paves the way for the development of further sensors using similar nanocomposites. [ABSTRACT FROM AUTHOR]

This study proposed a novel electrochemical sensor for the sensitive measurement of the eye medication ofloxacin (OFX), which is based on a NiO@C-dot nanocomposite. The NiO@C-dot nanocomposite was synthesized using the sol-gel method, which was then applied to alter a glassy carbon electrode (GCE). With regard to OFX, the modified GCE shown outstanding electrochemical activity along with good sensitivity, selectivity, and stability. With OFX concentrations ranging from 5 µM to 975 µM, the NiO@C-dot/GCE showed a linear relationship with a sensitivity of 0.63994 µA/µM. The limit of detection (LOD) was 0.023 µM. The response to 50 µM OFX was measured, and the electrode was stored at 4°C after each test in order to evaluate the sensor's long-term stability and repeatability. After 20 days, the peak current response was still 97.89 % of its initial value. After 40 days of prolonged storage, 93.78 % of the electrode's original responsiveness was retained. The sensor showed a recovery rate of 97.37–99.70 % in all sample types when it was used to detect OFX in human urine, tap water, and food samples. These findings highlight the NiO@C-dot/GCE's outstanding selectivity, dependability, and longevity as solid platforms for OFX detection in complicated samples for a range of applications.

Through the creation and characterization of novel poly (L-lactic acid) (PLLA)-based nanocomposites containing graphene oxide (GO), nanocrystalline hydroxyapatite (nano-HAP), and nickel oxide (NiO) nanoparticles, this study seeks to improve the performance of bone tissue scaffolds. Utilizing a casting procedure to create nanocomposites, wet chemical methods were used to synthesize nano-HAP. X-ray diffraction, transmission electron microscopy, and Fourier transform infrared spectroscopy were used to characterize the materials. The nanocomposite comprising 5 % GO + 5 % NiO + 10 % nano-HAP showed a 110 % increase in tensile modulus, a 38 % increase in extension, and a 29 % increase in load-bearing capacity compared to plain PLLA. The results showed a considerable increase in mechanical strength. On the surfaces of the nanocomposite, osteoblast adhesion and proliferation increased by 185 %, according to biological tests. Studies on degradation revealed regulated rates that matched bones' natural mending process while preserving a pH environment that was steady. According to these results, adding nanostructures to PLLA scaffolds improves their mechanical and biological properties considerably, which may lead to therapeutic uses in bone tissue engineering in the future.

NiO nanoparticles have garnered significant interest due to their diverse applications and unique properties, which differ markedly from their bulk counterparts. NiO nanoparticles are p-type semiconductors with a wide bandgap, high discharge capacity, and high carrier density, making them ideal for use in batteries, sensors, and catalysts. Their ability to generate reactive oxygen species also imparts disinfectant and antibiotic properties. Additionally, the higher Néel temperature of NiO compared with other antiferromagnetic materials makes it suitable for high-temperature applications in spintronic devices and industrial settings. This review focuses on the critical role of structure and composition in determining the magnetic properties of NiO nanoparticles. It examines how finite-size surface effects, morphology, crystallinity, and nickel distribution influence these properties. Fundamental physical properties and characterization techniques are discussed first. Various synthesis methods and their impact on NiO nanoparticle properties are then explored. Their magnetic phenomenology is examined in detail, highlighting the effects of finite size, particle composition and surface, and crystal quality. The review concludes with a summary of key insights and future research directions for optimizing NiO nanoparticles in technological applications.

The precursor nanoparticles of nickel hydroxide (Ni(OH)2) and nickel oxide (NiO) were successfully converted into the latter by the reaction of nickel chloride with hydrazine at ambient temperature. (TGA) and (DSC) were adapted for annealing the precursor products at different annealing temperatures (210, 285, 350, 390, 425, and 450 °C). XRD, TEM, and UV-VIS absorption spectroscopy were used to characterize the products. Both the band edge and energy gap values decrease with increasing annealing temperatures. Hysteresis loops are visible in the M-H curves of annealed (350 °C and 390 °C) precursor NiO NPs, indicating the presence of ferromagnetic Ni domains. However, NiO nanoparticles annealed at higher temperatures (425 °C and 450 °C) had a straight M-H curve, indicating paramagnetic properties. NiO NPs were used to study photocatalysis in the degradation of the MB dye. As annealing temperatures increased, the catalyst caused the degradation of MB. The sample that was annealed at 450 °C, however, exhibits the maximum photocatalytic activity, reaching up to 72.4% after being exposed to visible light. In other words, it was discovered that as the catalyst's annealing temperature rose, so did the rate of MB's photocatalytic degradation. [ABSTRACT FROM AUTHOR]

Presently, the utilization of nanomaterials has evolved as an appealing alternative for ever-changing healthcare obstacles due to their distinctive features and multifunctional applications. This work aimed to fabricate and analyze novel NiO/Ni2O3 nanoparticles (NPs) using Sargassum tentorium extracts and investigate their antioxidant and anticancer potentials. Diverse analytical instrumental tools were applied to explore NiO/Ni2O3 NPs, including UV–vis diffuse reflectance spectroscopy (UVDRS), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high-resolution scanning electron microscopy (HRTEM), and energy-dispersive X-ray (EDX) analyses. HRTEM images revealed mostly quasi-spherical and wire-shaped NPs with average 97 and 87 nm sizes for NiO/Ni2O3 NPs. Afterward, the biological properties of the biologically manufactured NiO/Ni2O3 NPs were explored. This work assessed the anticancer potential of as-fabricated NiO/Ni2O3 NPs utilizing the MTT assay. The experiment assessed cell viability at doses ranging from 7.81 to 500 µg/mL during a 24 h period for the breast cancer cell line (MCF-7). The study outcomes demonstrate a concentration-dependent effect of fabricated NiO/Ni2O3 NPs on MCF-7 cells. The inhibition of MCF-7 cells increases with the concentration of NiO/Ni2O3 NPs, achieving an IC50 value of 883.4 µg/mL in 24 h. Furthermore, the antioxidant potency of NiO/Ni2O3 NPs was examined via a free radical scavenging ABTS and DPPH assay. At a concentration of 50 μg/mL, NiO/Ni2O3 NPs also exhibited 74.71% ABTS scavenging and 71.62% DPPH scavenging inhibition, respectively. In conclusion, NiO/Ni2O3 NPs manufactured via Sargassum tenerrimum extracts could be promising candidates for further biomedical applications. Highlights: First-time disclosed work on Sargassum tenerrimum-mediated creation of NiO/Ni2O3 NPs via a bio-inspired approach. The manufactured NiO/Ni2O3 NPs were analyzed via UVDRS, FTIR, XRD, FESEM, HRTEM, and EDX analyses. As-prepared NiO/Ni2O3 NPs was investigated for anticancer potential using MTT assay for MCF-7 cell lines. Antioxidant potency of NiO/Ni2O3 NPs was revealed using ABTS and DPPH tests. [ABSTRACT FROM AUTHOR]

A simple and environmentally friendly method was employed to synthesize Nickel oxide (NiO) nanoparticles (NPs) using the leaf extract of Catharanthus roseus via the sol-gel method. Nickel sulfate hexahydrate was utilized as a precursor, with the leaf extract of Catharanthus roseus serving as both a reducing agent and a stabilizing agent. Various characterization techniques including X-ray diffraction, Fourier transfer infrared spectroscopy, Ultraviolet diffused reflectance spectroscopy (UV-DRS), Scanning electron spectroscopy, Energy dispersive X-ray analysis, Transmission electron microscopy, and Vibrating sample magnetometer were employed to investigate the structural and characteristic properties of the NiO NPs. The synthesized NiO NPs showed super paramagnetic behaviour at room temperature with saturated magnetization (Ms= 47.22x10-3 emu). Methylene blue is one of the industrial dyes that make water unfit for irrigation or drinking. It is a toxic, carcinegic and recalcitrant dye which causes a severe threat to human health. As the dye is difficult to be degraded, a biological eco-friendly method is followed in the present study. NiO NPs had a band energy gap of 3.6 eV and a strong potential to be used as photocatalysts in wastewater treatment to rapidly degrade textile dyes. Almost complete photocatalytic degradation of methylene blue dye was achieved using NiO NPs, which also exhibited high stability and reusability for three additional cycles without any significant decrease in efficacy. [ABSTRACT FROM AUTHOR]

Nickel oxide nanoparticles (NiO NPs) were synthesized using an eco-friendly green method employing Imperata cylindrica extract. The synthesized NiO NPs on the nanoscale and their morphology, sizes, surface area, and optical properties were characterized using various analytical techniques such as UV-visible, FTIR, EDX, FE-SEM, and AFM. This study explored the phytochemicals present in Imperata cylindrica that contribute to its bio-reducing capabilities, utilizing gas chromatography-mass spectrometry analysis. Additionally, the catalytic potential of NiO NPs was investigated for the degradation of rhodamine B, a hazardous environmental contaminant found in water bodies. The degradation process was examined under various experimental conditions, including different catalyst loadings, irradiation sources (UVC, UVB, UVA, and halogen lamps), reaction media, and the use of NaOCl as an activating agent for the catalysts. Antibacterial properties of NiO NPs against both gram-positive and gram-negative bacteria were studied. [ABSTRACT FROM AUTHOR]

The use of nanomaterials in bioethanol production is promising and on the increase. In this report, the effect of nickel oxide nanoparticles (NiO NPs) on bioethanol production in the presence of a novel yeast strain, Pichia kudriavzveii IFM 53048 isolated from banana wastes was investigated. The hot percolation method was employed for the green synthesis of NiO NPs. The logistic and modified Gompertz kinetic models employed in this study showed a 0.99 coefficient of determination (R2) on cell growth, and substrate utilization on the initial rate data plot which indicate that these model were best suited for bioethanol production studies. As a result, 99.95% of the substrate was utilized to give 0.23 g/L/h−1 bioethanol productivity, and 51.28% fermentation efficiency, respectively. At 0.01 wt% of NiO NPs, maximum production was achieved with 0.27 g/g bioethanol yield. Meanwhile, 0.78 h−1 maximum specific growth rate (µmax) of the microorganism, 3.77 g/L bioethanol concentration (Pm), 0.49 g/L/h production rate (rp.m), and 2.43 h production lag time (tL) were obtained when 0.01 wt% of NiO NPs were used during the bioethanol production process. However, a decrease in bioethanol concentrations occurred at ≥0.02 wt% of NiO NPs. The incorporation of NiO NPs in the simultaneous saccharification and fermentation (SSF) process improved the production of bioethanol by 1.90 fold using banana peel wastes as substrate. These revealed NiO NPs could serve as a suitable biocatalyst in the green production of bioethanol from banana peel waste materials. [ABSTRACT FROM AUTHOR]

In this work, a new electrochemical sensor for the detection of the doping agent metoprolol (MTP) in food samples and bodily fluids is presented. The sensor's foundation is a nanocomposite made of polypyrrole (PPy) and nickel oxide nanoparticles (NiO NPs) on a glassy carbon electrode (GCE). Pyrole was electropolymerized to create the nanocomposite, and then NiO NPs were electrodedeposited on the GCE surface (NiO NPs/PPy/GCE). By combining the benefits of PPy with NiO NPs, this technique offers good electrocatalytic activity and a large surface area for analyte interaction. The nanocomposite was characterized using structural analyses such as scanning electron microscopy (SEM), X-ray diffractometry (XRD) and X-ray photoelectron spectroscopy (XPS). These analyses revealed a network-like structure that improved the accessibility of the electrolyte ions and showed that the nanocomposite had been successfully deposited on the GCE surface. The electrochemical MTP sensor was examined using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) tests. The sensor's sensitivity was 0.03074 μA/μM, and it demonstrated a linear connection between the peak currents and the MTP concentrations (5–1600μM). The suggested sensor's limit of quantification (LOQ) and limit of detection (LOD) were determined to be 0.581 μM and 0.018 μM, respectively. The prepared urine sample produced acceptable recovery rates in the range of 98.40–99.86% in the real sample analyses, together with low relative standard deviation values (below 4.16%). In a similar vein, the prepared apple juice sample analysis revealed low relative standard deviation values (less than 4.28%) and respectable recovery rates ranging from 97.20 to 99.66%. The results showed low relative standard deviation values and good recovery rates, demonstrating the high precision and dependability of the suggested approach. [ABSTRACT FROM AUTHOR]

In the current paper, nickel oxide nanoparticles (NiO NPs) was successfully applied as a sustainable effective and recoverable catalyst for the preparation of 2-amino-4H pyran derivatives 2-11 via one-pot, threecomponent reaction of 4-formylphenyl-4-methyl benzenesulfonate (1) with malononitrile and active methylene compounds in green solvent water and ethanol in ratio (3:1) in excellent yield (95-98%) and shorter reaction time (5-8 min). The structures of the pyran derivatives were elucidated by elemental and spectral analyses such as IR, 1H NMR, 13C NMR and DEPT 135 spectra. Moreover, the characterization of the catalyst after and before the reaction were studied using X-ray diffraction (X-RD), scanning electron microscope (SEM), EDX techniques and IR-spectra. It has been indicated that catalyst has the same efficiency. The application of this protocol has many advantages such as eco-friendly, inexpensive, simple protocol and easy recovery of the catalyst. Overall products are designed, synthesized and studied for their anti-microbial evaluation. It has been found that is compounds 2, 3, 7 and 10 are the most active against antibacterial compression with the stander drug Ampicillin. On the other hand, Compounds 2, 3, 8, and 11 displayed the most promising antifungal activities with Amphotericin B. [ABSTRACT FROM AUTHOR]

Electrodeposition of nickel nanoparticles, achieved through potentiostatic amperometry followed by thermal annealing at 200–400 °C, has produced nickel oxide nanoparticles on flexible graphene substrates. Using transmission electron microscopy and depth-profiling X-ray photoelectron spectroscopy, we demonstrate that the resulting NiOx nanoparticles exhibit several Ni oxidation states and a core–shell heterostructure, with a metallic Ni crystalline core and a NiO crystalline shell with a mixed crystalline–amorphous NiOOH/Ni-(OH)2 skin. The composition of the NiOOH/Ni-(OH)2 redox couple relative to NiO is found to vary with the annealing temperature and annealing time. The use of a highly conductive graphene substrate enhances electron transfer. The NiOx nanoparticle samples obtained with selected annealing temperature–time combinations are used for lactate detection, with the best sample showing an excellent linear range of 0.02–65.1 mM, a high sensitivity of 80.0 μA mM–1 cm–2, and an impressive limit of detection of 0.00015 mM. The NiOx nanoparticle sample is also tested for lactate sensing in an artificial sweat electrolyte, and it exhibits a reduced linear range of 0.02–53.1 mM and a lower limit of detection of 0.00013 mM while maintaining the same high sensitivity of 80.0 μA mM–1 cm–2. This sensing performance can be optimized by controlling the relative composition NiOOH + Ni-(OH)2 to NiO, with the sample obtained with a higher relative content at a lower annealing temperature found to provide more reactive sites for lactate detection and therefore higher sensitivity. [ABSTRACT FROM AUTHOR]

The influence of nanofiller (NF) additives containing nickel oxide nanoparticles (NP) stabilized by a polymer matrix of high density polyethylene (PE), obtained by the mechanochemical method, on the properties of composites based on isotactic polypropylene (PP) was studied using X-ray diffraction (XRD) and thermogravimetric (TGA) analyses. An improvement in the strength and deformation parameters as well as the thermal-oxidative stability of the resulting nanocomposites was revealed, which is apparently due to the effect of interfacial interaction of nickel containing nanoparticles with the polymer matrix. It has been shown that PP-based nanocomposites can be processed both by pressing and by injection molding and extrusion. Minor amounts of nanofiller introduced into the polymer play the role of structure formers: artificial crystallization nuclei, which contributes to the occurrence of a fine spherulite structure in the polymer, characterized by improved physicomechanical and thermal properties of the resulting nanocomposite. [ABSTRACT FROM AUTHOR]

Nickel oxide (NiOX) is a desirable hole‐transporting material for perovskite solar cells owing to their merits of low‐cost, stable, and readily scalable. However, the NiOX|perovskite interface suffers from serious recombination and poor photostability because of the interfacial redox reactions. Herein, NiOX nanoparticles with tunable size have been synthesized at low temperatures by controlling the reactivity of the hydrolysis reaction. A self‐assembled monolayer composed of a ruthenium complex, i.e., C106, is then introduced to optimize the interfacial properties. The C106 molecule chemically bonds to NiOX via carboxyl acid group, which passivates the surface defects of NiOX and suppresses the negative redox reaction at the interface. The modification leads to an improvement in perovskite film morphology, crystallization, and band alignment. As a result, the efficiency of solar cells has been improved from 18.1% to 20.5%. More importantly, the modified solar cells retain >80% of their initial performance after continuous operation under 100 mW cm−2 irradiation for 800 h, which is much enhanced than the unmodified devices. [ABSTRACT FROM AUTHOR]

The current study evaluated the biogenic synthesis of nickel oxide nanoparticles (SP-NiONPs) from the root extract of (Salvadora persica) S. persica and their biological properties. The nanoparticles were characterized using spectroscopic and microscopic techniques and then evaluated for their antimicrobial properties against 10 oral pathogens. The ultraviolet-visible (UV–Vis) spectra exhibited a distinctive resonance spectrum at 334 nm for the SP-NiONPs produced from S. persica. The fourier transform infrared (FTIR) analysis revealed the presence of functional groups of biomolecules of S. persica that served as reducing and capping agents of the SP-NiONPs. The scanning electron microscope (SEM) and transmission electron microscopy (TEM) analyses showed that the nanoparticles were spherical-shaped, tightly packed, and ranged in size from 18.20 nm to 45.12 nm. The energy dispersive x-ray (EDX) analysis confirmed 69.9% of the nickel (Ni) content by weight, and the X-ray diffraction (XRD) results showed the face-centered cubic (FCC) crystalline structure of the formed SP-NiONPs. The antioxidant activity of the SP-NiONPs exhibited a dose-dependent profile with an IC50 value of 51.45 ± 0.65 and a 54.13 ± 0.98 DPPH• and ABTS•+ radical scavenging activity, respectively. The SP-NiONPs showed an antibacterial activity against all the test strains; however, E. cloacae was found to be the most sensitive strain, with an inhibition zone of 31 ± 0.50 mm. The SEM image of the E. cloacae cells treated with SP-NiONPs showed irregular shapes and ruptured, destroyed cell membranes. Our findings revealed that SP-NiONPs could be used as excellent antibacterial agents against oral pathogens. [ABSTRACT FROM AUTHOR]

The current study evaluated the biogenic synthesis of nickel oxide nanoparticles (SP-NiONPs) from the root extract of (Salvadora persica) S. persica and their biological properties. The nanoparticles were characterized using spectroscopic and microscopic techniques and then evaluated for their antimicrobial properties against 10 oral pathogens. The ultraviolet-visible (UV–Vis) spectra exhibited a distinctive resonance spectrum at 334 nm for the SP-NiONPs produced from S. persica. The fourier transform infrared (FTIR) analysis revealed the presence of functional groups of biomolecules of S. persica that served as reducing and capping agents of the SP-NiONPs. The scanning electron microscope (SEM) and transmission electron microscopy (TEM) analyses showed that the nanoparticles were spherical-shaped, tightly packed, and ranged in size from 18.20 nm to 45.12 nm. The energy dispersive x-ray (EDX) analysis confirmed 69.9% of the nickel (Ni) content by weight, and the X-ray diffraction (XRD) results showed the face-centered cubic (FCC) crystalline structure of the formed SP-NiONPs. The antioxidant activity of the SP-NiONPs exhibited a dose-dependent profile with an IC50 value of 51.45 ± 0.65 and a 54.13 ± 0.98 DPPH• and ABTS•+ radical scavenging activity, respectively. The SP-NiONPs showed an antibacterial activity against all the test strains; however, E. cloacae was found to be the most sensitive strain, with an inhibition zone of 31 ± 0.50 mm. The SEM image of the E. cloacae cells treated with SP-NiONPs showed irregular shapes and ruptured, destroyed cell membranes. Our findings revealed that SP-NiONPs could be used as excellent antibacterial agents against oral pathogens.

The two most prominent areas of nanotechnology and nanoscience are environmental remediation and biomedical applications, which has a strong need to develop cleaner and more eco-friendly methods for preparing functional nanomaterials. This involves incorporating non-toxic chemicals and reagents for converting metal cations into metal or metal oxide nanoparticles (NPs), using readily available plant reagents and microbes as redox mediators. The extracts of these plants and microbes contain varying amounts of phytochemicals and metabolites that act as redox mediators and capping agents to stabilize biosynthesized NPs. Considering these natural reagents for forming metal/metal oxide NPs, the present work aims to provide a complete review of the green fabrication of nickel oxide (NiO) NPs using extracts from various plant and microbial sources. In addition, the performance of various biosynthesized NiO NPs and their potential uses in biological applications are discussed.

The precursor nanoparticles of nickel hydroxide (Ni(OH)2) and nickel oxide (NiO) were successfully converted into the latter by the reaction of nickel chloride with hydrazine at ambient temperature. (TGA) and (DSC) were adapted for annealing the precursor products at different annealing temperatures (210, 285, 350, 390, 425, and 450 °C). XRD, TEM, and UV-VIS absorption spectroscopy were used to characterize the products. Both the band edge and energy gap values decrease with increasing annealing temperatures. Hysteresis loops are visible in the M-H curves of annealed (350 °C and 390 °C) precursor NiO NPs, indicating the presence of ferromagnetic Ni domains. However, NiO nanoparticles annealed at higher temperatures (425 °C and 450 °C) had a straight M-H curve, indicating paramagnetic properties. NiO NPs were used to study photocatalysis in the degradation of the MB dye. As annealing temperatures increased, the catalyst caused the degradation of MB. The sample that was annealed at 450 °C, however, exhibits the maximum photocatalytic activity, reaching up to 72.4% after being exposed to visible light. In other words, it was discovered that as the catalyst’s annealing temperature rose, so did the rate of MB’s photocatalytic degradation.

Mearg Gidey Berhe,1 Yemane Tadesse Gebreslassie2 1Department of Physics, College of Natural and Computational Science, Adigrat University, Adigrat, Ethiopia; 2Department of Chemistry, College of Natural and Computational Science, Adigrat University, Adigrat, EthiopiaCorrespondence: Yemane Tadesse Gebreslassie, Tel +251 910027187, Email yemanet12@gmail.com; yemane.tadese@adu.edu.etAbstract: Nickel oxide nanoparticles have gained tremendous attention recently in a variety of scientific domains thanks to their characteristic chemical, physical, optical, and biological properties. Due to the diversity of applications in various fields, different physicochemical methods have been used to synthesize nickel oxide nanoparticles. However, most conventional methods use hazardous chemicals during synthesis and become liable for potential health risks, while others are expensive and require a lot of energy to synthesize nanoparticles. As a result, the nanoparticles become less biocompatible and biologically inefficient. Biogenic synthesis of nanoparticles is currently proposed as a valuable alternative to the physical and chemical methods, as it is a simple, non-toxic, cheap, green and facile approach. This synthetic method uses biological substrates such as plant extracts, microorganisms, and other biological products to synthesize nickel oxide nanoparticles. The various phytochemicals from plant extracts, enzymes or proteins from microorganisms, and other biological derivatives play as reducing, stabilizing, and capping agents to provide bioactive and biocompatible nickel oxide nanoscale material. This review discusses current findings and trends in the biogenic synthesis of nickel oxide nanoparticles and their biological activities such as antibacterial, antifungal, antileishmanial, and anticancer, with an emphasis on antimicrobial and anticancer activity along with their mechanistic elucidation. Overall, this thorough study provides insight into the possibilities for the future development of green nickel oxide nanoparticles as therapeutic agents for a variety of ailments.Graphical Abstract: Keywords: nickel oxide nanoparticles, biogenic synthesis, antimicrobial activity, antileishmanial activity, anticancer activity

Nickel oxide nanoparticles (NiONPs) are toxic heavy metal compounds that induce liver fibrosis and metabolic disorders. Current research shows that the intestinal microbiota regulates liver metabolism through the gut-liver axis. However, it is unclear whether NiONPs affect the intestinal microbiota and the relationship between microbiota and liver metabolic disorders. Therefore, in this study, we established liver fibrosis model by administering 0.015, 0.06 and 0.24 mg/mL NiONPs through tracheal instillation twice a week for 9 weeks in rats, then we collected serum and fecal sample for whole metabolomics and metagenomic sequencing. As the result of sequencing, we screened out seven metabolites (beta-D-glucuronide, methylmalonic acid, linoleic acid, phosphotidylcholine, lysophosphatidylinositol, docosapentaenoic acid and progesterone) that related to functional alterations (p

Antimicrobial resistance and cancer claim millions of lives each year, making it important to find effective medications. The current study focuses on the rapid and sustainable manufacture of nickel oxide nanoparticles using Sargassum wightii aqueous extract (SW-NiO NPs) as a novel antibacterial and anticancer agent. The presence of phytochemicals in the Sargassumwightii in all extract was qualitatively screened and water extract, which is found to contain abundant phytochemical was used for the biosynthesis. Thus synthsized SW-NiO nanoparticles was characterised by UV–Visible, FT-IR, XRD, SEM, and TEM spectral studies, and then screend for its invitro anti microbial activity against bacterial strains (E. coli, K. pneumoniae, S. aureus, and B. subtilis) and fungal activity with the fungus strains (C. albicans, C. tropicalis),invitro anticancer and larvicidal activity. The SW-NiO NPs possessed cubic and hexagonal structures with an average crytallite size of 15–20 nm, according to the results of the analytical characterization. SEM and TEM analysis confirms the spherical like morphology and their respective elemental composition were identified by EDAX studies. The antimicrobial activity was carried by well diffusion method.Compared to gram-negative organisms, gram-positive species were more vulnerable to the SW-NiO NPs with the zone of inhibition 17 mm. The fungal activity results showed the zone of inhibition 16 and 14 mm. It was also found that SW-NiO NPs inhibit the growth of tested fungus at higher doses. The cytotoxicity studies with liver cancer cell line through MTT assay revealed the inhibition value at 52.25 ± 0.05 µM, indicating their sensitivity to the HepG2 cell line. SW-NiO NPs made with water extract showed the highest larvicidal activity and 88.33 % death of Aedes agypti(AE). The LC50 and LC90 values for SW-NiO NPs against Aedes agypti(AE) larvae are found to be 31.420 and 134.261 ppm, respectively. The findings of the antimicrobial, larvicidal and invitro anticancer screening of this work provide compelling evidence that SW-NiO NPs made from an aqueous extract of Sargassum wightii have considerable biological applications which can be explored in detail on identifying the potential phyto constituents which are responsible for the activity.

The possibility of fabricating metal nanoparticles using plant extracts has already been explored in phytomedicines. Nanobiotechnology has a wide range of potential applications, including the cosmetics industry, packaging, coatings, biomedicine, and the enhancement of biological activity. Nickel oxide (NiO) was fabricated in a waste-free, low-cost method and then used to adorn Marsdenia tenacissima extract (MTE), a crucial plant leaf. After forming the nanoparticles, MTE@NiO-NPs were also tested for their optical and biological qualities. The morphological characteristics of NiO-NPs are rhombohedra and slightly agglomerated, and the particle size of the biosynthesized NiO-NPs is observed in the range of ∼ 15 nm. The in vitro cytotoxicity of Marsdenia tenacissima extract (MTE) and nanoparticles on lung cancer cells (A549 and H1299) by MTT assay. The in vitro cytotoxicity assay results revealed that the newly fabricated nanoparticles effectively kill cancer cells with low minimal inhibitory concentration. The various biochemical staining assays assessed the cell death and morphological investigation. Furthermore, the mode of cell death was evaluated by mitochondrial membrane potential (Δψm) and reactive oxygen species (ROS). Therefore, the study concludes that the plant leaves extract of Marsdenia tenacissima is a powerful reducing/capping agent in fabricating MTE@NiO-NPs, demonstrating useful biological features.

Conventional nanoparticle (NP) synthesis based on physical and chemical processes are costly and are mostly associated with harmful effects on environment, whereas the use of plant extract is eco-friendly and cost effective which could act as reducing, stabilizing and capping agent. Herein, the present study is aimed to synthesize nickel oxide nanoparticles from nickel nitrate precursor and Sesbania grandiflora flower extract. Synthesized nickel oxide nanoparticles were characterized by Ultraviolet–Visible, FT-IR, SEM and XRD analyses. Ni-O stretching vibrations at 418 cm−1 in the FT-IR spectrum confirmed the formation of NiO NPs. The XRD pattern revealed the crystallite size of the NiO NPs to be in range of 19.9–60.4 nm. The morphology of the NiO NPs as revealed by the SEM images, which was rod like structure. The anticancer activity of the synthesized NiO NPs was evaluated with MM2 (human breast cancer cells) and HeLa (human cervical cancer cells) and compared with cisplatin. In MM2, the IC50 value of the NiO NPs is 33.57 ± 1.37 µg/mL whereas in HeLa, the IC50 value is 26.92 ± 1.67 µg/mL. The value is significant when compared with the conventional standard drug cisplatin (17.80 ± 0.30 µg/mL for MM2 and 15.06 ± 0.84 µg/mL for HeLa).

Wastewater is one of the major concerns for agriculture, and the composition of wastewater depends on its origin. Generally, industrial wastewater consists of azo dyes and heavy metals that contaminate the food chain. In this study, nickel oxide nanoparticles (NiO-NPs) were biosynthesized from Shewnella spp. and characterized by UV–visible spectroscopy (UV–vis), Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). Azo dye decolorization indicated that NiO-NPs decolorize methylene blue (MB) (82.36%), Congo red (CR) (93.57%), malachite green (MCG) (91.05%), reactive black 5(RB5) (55.17%), reactive red-II(RR-II) (55.45%), and direct blue-I(DB-I) (59.94%) at a dye concentration of 25 mg L−1 after 4 h of sunlight exposure. Additionally, the rate of decolorization was also examined for a 50 mg L−1 concentration of dye. In order to investigate the photocatalytic potential of NiO-NPs, different dyes were also subjected to static and shaking conditions for dye decolorization. The treatment of industrial wastewater with NiO-NPs showed a significant reduction in pH from 8.5 to 6.1, EC (48.38%), chemical oxygen demand (49.24%), total dissolved solids (67.05%), sulfates (52.5%), and phosphates (49.49%). The results of this study indicated that biosynthesized NiO-NPs are an attractive choice for azo dye degradation and industrial wastewater treatment, and they can help save the depleted natural resources of water for agricultural purposes. [ABSTRACT FROM AUTHOR]

A novel catechol-based PCA@MWCNT-Ni(OH)2 hybrid material was prepared and used to construct a non-enzymatic glucose biosensor. In this synthesis, MWCNTs were covered with a poly(caffeic acid) coating and then subjected to a straightforward electrochemical process to decorate the hybrid material with Ni(OH)2 particles. The physicochemical properties and morphology of the nanomaterial were characterized using high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS), and atomic force microscopy (AFM). Amperometry and cyclic voltammetric studies demonstrated the enhanced redox properties of a GC/PCA@MWCNT-Ni(OH)2 electrode and its electrocatalytic activity in glucose detection, with a low detection limit (0.29 μM), a selectivity of 232.7 μA mM−1 cm−2, and a linear range of 0.05–10 mM, with good stability (5 months) and reproducibility (n = 8). The non-enzymatic sensor was also used for glucose determination in human serum and human blood, with recovery values ranging from 93.3% to 98.2%. In view of the properties demonstrated, the described GC/PCA@MWCNT-Ni(OH)2 sensor represents a facile synthesis method of obtaining the hybrid nanomaterial and a low-cost approach to electrochemical glucose measurement in real samples (human serum, human blood). [ABSTRACT FROM AUTHOR]

This research deals with the manufacture of nickel oxide nanoparticles NiO, it has been characterized by Field emission scanning electron microscopy (FESEM), and Fourier Transform Infrared (FTIR), and their radii were range (10-20) nm and frequency (58.49%), where did not exceed the largest particles is (60 nm). Nitrogen carbon quantum dots (NCQD) were prepared based on a carbon-rich source and a nitrogen-rich source with a heat source. Nitrogen carbon quantum dots (NCQD) were prepared from L-glutamic acid as a carbon source and ethylene diamine (EDA) as a nitrogen-rich source depending on the source of heat: (reflex, autoclave, UV-digestion, oven, and microwave). The (NCQD) synthesis was characterized using spectral scanning (UV-VIS), then, the effect of its quenching ratio was studied using a sulfuric acid solution, it was found that the best thermal method is the autoclave then a UV-digester then oven and microwave. Nickel oxide-nitrogen quantum carbon dots (NiO-NCQD) are prepared from a mix between NiO nanoparticles with nitrogen carbon quantum dots as nano-adsorbent. (NiO-NCQD) has been characterized by Fourier Transform Infrared (FTIR) and energy-dispersive X-ray (EDX). [ABSTRACT FROM AUTHOR]

In this work, nickel oxide nanoparticles are synthesized using plant extracts of Camellia sinensis, Matricaria chamomilla L., Artemisia herba-alba Asso. and Punica granatum L. peel., with an evaluation of their antimicrobial activity. The possible mechanism of the formation of NiO nanoparticles mediated by plant extracts has been elucidated. Synthesized green nickel oxide nanoparticles (NiO NPs) were characterized using X-ray diffraction (XRD), energy-dispersive X-ray (EDX) analysis, field emission-scanning electron microscopy (FE-SEM), UV–visible spectrophotometer analysis (UV–Vis), Fourier transform infrared spectroscopy (FTIR), and Zeta potential (ZP). The crystal size of the as-prepared NiO nanoparticles estimated via the Debye Scherrer — formula was about (19.68–23.77) nm. Nickel oxide-mediated nanoparticles possess strong antibacterial activity (gram-positive and gram-negative) and fungi. [ABSTRACT FROM AUTHOR]

Nickel oxide (NiO) and cobalt doped Nickel oxide (Co-NiO) nanoparticles were successfully synthesized by cost effective, environmentally friendly, and scalable eco-precipitation method. The prepared nanoparticles were investigated by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy dispersive X-ray analysis (EDAX), Fourier Transform Infrared Spectroscopy (FTIR), Optical spectroscopy (UV) and Cyclic voltammetric (CV). The structural characterization was carried out by X-ray diffraction which confirmed the polycrystalline nature of the particles with cubic structure. SEM analysis of the particles enabled the conclusion that the prepared particles were polycrystalline, irregularly spherical in shape, and agglomerated. The chemical bond and functional group were identified from FTIR spectroscopy and the elemental composition of prepared particles was identified by EDAX analysis. From UV-Vis absorbance spectra and Tauc relation, the type of transition and band gaps of the particles were estimated. The electrochemical performance was investigated using Cyclic Voltammetry (CV), Galvanostatic charge discharge (GCD), and Electrical Impedance Spectroscopy (EIS) in presence of 1M KOH as an electrolyte. The NiO and cobalt doped NiO coated electrodes provide promising applications as electrode materials for energy storage devices. [ABSTRACT FROM AUTHOR]

In this study, nickel oxide (NiO) nanoparticles were successfully synthesized by Syzygium aromaticum (clove) extract via a green synthesis method and evaluated their antibacterial properties. The bio-molecules inside the extract play an important role in converting nickel nitrate salt into nickel oxide nanoparticles. The prepared nickel oxide nanoparticles were characterized via different techniques such as X-ray Diffraction, fourier transform infrared spectroscopy, field emission-scanning electron microscopy and ultravioletevisible spectrophotometer. From X-ray diffraction results, the crystallite size of NiO NPs was estimated to be (39.7 nm). The fourier transform infrared spectroscopy exhibits intense two peaks at 594 cm¡1 and 469 cm¡1 which indicates the formation of NiO NPs. In addition, the energy band-gap calculated by Tauc's formula was ~2.89 eV. Finally, The antibacterial activity study results detected that NiO NPs have the highest activity against Staphylococcus aureus when compared to Escherichia coli. Thus, the present study exhibits good antibacterial activity, which may be explored in future clinical treatments. [ABSTRACT FROM AUTHOR]

Lately, nickel oxide nanoparticles (NiO NPs) have been employed in different industrial and biomedical fields. Several studies have reported that NiO NPs may affect the development of reproductive organs inducing oxidative stress and, resulting in male infertility. We investigated the in vitro effects of NiO NPs on porcine pre-pubertal Sertoli cells (SCs) which undergone acute (24 h) and chronic (from 1 up to 3 weeks) exposure at two subtoxic doses of NiO NPs of 1 mg/ml and 5 mg/ml. After NiO NPs exposure we performed the following analysis: (a) SCs morphological analysis (Light Microscopy); (b) ROS production and oxidative DNA damage, gene expression of antioxidant enzymes (c) SCs functionality (AMH, inhibin B Real-time PCR analysis and ELISA test); (d) apoptosis (WB analysis); (e) pro-inflammatory cytokines (Real-time PCR analysis), and (f) MAPK kinase signaling pathway (WB analysis). We found that the SCs exposed to both subtoxic doses of NiO NPs didn’t sustain substantial morphological changes. NiO NPs exposure, at each concentration, reported a marked increase of intracellular ROS at the third week of treatment and DNA damage at all exposure times. We demonstrated, un up-regulation of SOD and HO-1 gene expression, at both concentrations tested. The both subtoxic doses of NiO NPs detected a down-regulation of AMH and inhibin B gene expression and secreted proteins. Only the 5 mg/ml dose induced the activation of caspase-3 at the third week. At the two subtoxic doses of NiO NPs a clear pro-inflammatory response was resulted in an up-regulation of TNF-a and IL-6 in terms of mRNA. Finally, an increased phosphorylation ratio of p-ERK1/2, p-38 and p-AKT was observed up to the third week, at both concentrations. Our results show the negative impact of subtoxic doses NiO NPs chronic exposure on porcine SCs functionality and viability. [ABSTRACT FROM AUTHOR]

Domiati cheese is the most popular type of white soft cheese in Egypt. Staphylococcus aureus is a common microorganism that can easily contaminate Domiati cheese during processing and distribution. Enterotoxigenic S. aureus strains produce staphylococcal enterotoxins (SE) that have been involved in food poisoning outbreaks worldwide. The aim of the present study was to examine the inhibitory effect of yoghourt starter culture and nickel oxide nanoparticles (NiO NPs) on the development of the enterotoxigenic S. aureus together with the enterotoxin production during the manufacturing and storage of Domiati cheese. Fresh cow's milk was inoculated with S. aureus in a count of six log CFU/mL with the addition of either yoghourt starter culture or NiO Nps. The cytotoxicity of NiO NPs on normal human epithelial cells (HEC) was assessed using the MTT assay. In the current study, the inoculated milk was used for making Domiati cheese and the survival Weibull and log-linear models were fitted to the observed data. The obtained results showed that the mean log count of S. aureus decreased one week earlier by using yoghourt starter culture. Staphylococcal enterotoxin A (SEA) was identified only in the control cheese. Notably, Domiati cheese contained MIC of NiO NPs (35 µg/mL), which resulted in a significant decrease in S. aureus counts since at day 21 of cheese ripening it was not detected (<10 CFU/g). Overall, the current study indicated that the addition of yoghourt starter culture and NiO NPs during the processing of Domiati cheese could be useful candidates against S. aureus and enterotoxin production in the dairy industry. [ABSTRACT FROM AUTHOR]

Lately, nickel oxide nanoparticles (NiO NPs) have been employed in different industrial and biomedical fields. Several studies have reported that NiO NPs may affect the development of reproductive organs inducing oxidative stress and, resulting in male infertility. We investigated the in vitro effects of NiO NPs on porcine pre-pubertal Sertoli cells (SCs) which undergone acute (24 h) and chronic (from 1 up to 3 weeks) exposure at two subtoxic doses of NiO NPs of 1 μg/ml and 5 μg/ml. After NiO NPs exposure we performed the following analysis: (a) SCs morphological analysis (Light Microscopy); (b) ROS production and oxidative DNA damage, gene expression of antioxidant enzymes (c) SCs functionality (AMH, inhibin B Real-time PCR analysis and ELISA test); (d) apoptosis (WB analysis); (e) pro-inflammatory cytokines (Real-time PCR analysis), and (f) MAPK kinase signaling pathway (WB analysis). We found that the SCs exposed to both subtoxic doses of NiO NPs didn’t sustain substantial morphological changes. NiO NPs exposure, at each concentration, reported a marked increase of intracellular ROS at the third week of treatment and DNA damage at all exposure times. We demonstrated, un up-regulation of SOD and HO-1 gene expression, at both concentrations tested. The both subtoxic doses of NiO NPs detected a down-regulation of AMH and inhibin B gene expression and secreted proteins. Only the 5 μg/ml dose induced the activation of caspase-3 at the third week. At the two subtoxic doses of NiO NPs a clear pro-inflammatory response was resulted in an up-regulation of TNF-α and IL-6 in terms of mRNA. Finally, an increased phosphorylation ratio of p-ERK1/2, p-38 and p-AKT was observed up to the third week, at both concentrations. Our results show the negative impact of subtoxic doses NiO NPs chronic exposure on porcine SCs functionality and viability.

Elaeagnus angustifolia (EA) mediated green chemistry route was used for the biofabrication of NiONPs without the provision of additional surfactants and capping agents. The formation of NiONPs was confirmed using advanced different characterization techniques such as Scanning electron microscopy, UV, Fourier transmission-infrared, RAMAN, and energy dispersal spectroscopic and dynamic light scattering techniques. Further, different biological activities of EA-NiONPs were studied. Antibacterial activities were performed using five different bacterial strains using disc-diffusion assays and have shown significant results as compared to standard Oxytetracycline discs. Further, NiONPs exhibited excellent antifungal performance against different pathogenic fungal strains. The biocompatibility test was performed using human RBCs, which further confirmed that NiONPs are more biocompatible at the concentration of 7.51–31.25 µg/mL. The antioxidant activities of NiONPs were investigated using DPPH free radical scavenging assay. The NiONPs were demonstrated to have much better antioxidant potentials in terms of % DPPH scavenging (93.5%) and total antioxidant capacity (81%). Anticancer activity was also performed using HUH7 and HEP-G2 cancer cell lines and has shown significant potential with IC50 values of 18.45 μg/mL and 14.84 μg/mL, respectively. Further, the NiONPs were evaluated against Lesihmania tropica parasites and have shown strong antileishmanial potentials. The EA-NiONPs also showed excellent enzyme inhibition activities; protein kinase (19.4 mm) and alpha-amylase (51%). In conclusion, NiONPs have shown significant results against different biological assays. In the future, we suggest various in vivo activities for EA-NiONPs using different animal models to further unveil the biological and biomedical potentials. [ABSTRACT FROM AUTHOR]

Over the past several years, the greener fabrication of metal oxide nanoparticles has attracted significant attention due to their simplicity, eco-friendliness, availability, and nontoxicity. This paper focused on the fabrication of nickel oxide nanoparticles (NiO-NPs) using the leaf extract of Ziziphus spina-christi L. and evaluating its potential biological activities. The characterization of synthesized NiO-NPs was confirmed using ultraviolet–visible spectroscopy, field emission-scanning electron microscope, energy-dispersive X-ray spectroscopy, and X-ray diffraction. Furthermore, protoscolicidal, antibacterial, and antioxidant activities and hemocompatibility of NiO-NPs were investigated. The findings revealed that the NiO-NPs were crystalline on nanoscale between 50- and 90-nm particle sizes. The NiO-NPs showed high scolicidal activity against Echinococcus granulosus. The viability of the treated protoscoleces exponentially decreased with an increase in the concentration of NiO-NPs. The NiO-NPs exhibited effective antibacterial activity against Escherichia coli and Staphylococcus aureus. NiO-NPs also possess a H2O2 scavenging activity in a dose-dependent manner. This study revealed that the Z. spina-christi L. leaf extract is an effective reducing and capping agent for the production of NiO-NPs; it showed critical biological properties. Moreover, NiO-NPs have a potent antioxidant activity and low toxicity on the erythrocytes and appear hemocompatible. [ABSTRACT FROM AUTHOR]

The present study focuses on the synthesis of pure and different concentrations, viz. 2 %, 5 %, and 10 %, 15 % of Silver doped nickel oxide (NiO) nanoparticles prepared by green synthesis method using aqueous flower extract of Moringa oleifera Lam. (MO). The flower extract of MO contains several bioactive constituents that can be used as a strong reducing, stabilizing and capping agent to prepare pure and Silver (Ag) doped NiO NPs. The XRD studies confirm the crystallinity structure of the material. Pure NiO is found to be around 20.38 nm on average, 14.7–18.29 nm for Ag-doped NiO nanoparticles, and it belongs to the face-centred cubic (FCC) structure. The morphology of the samples is studied using SEM analysis, and the elements present are confirmed by EDS. FTIR-ATR studies confirm the structure of the functional groups present in the samples. The UV–Vis spectra analyses are used to calculate the band gap values for the synthesized nanoparticles. Agar well diffusion methods are used to study the antimicrobial activity of green synthesized pure and silver-doped NiO nanoparticles. The antimicrobial studies reveal that good antibacterial activity is present in both gram-positive and gram-negative organisms of the green synthesis of pure and Silver doped NiO nanoparticles. Hence, the synthesized silver-doped NiO nanoparticles can be used for biomedical applications due to their antibacterial properties. [Display omitted] [ABSTRACT FROM AUTHOR]

Nickel oxide nanoparticles [NiO NPs] were synthesized using chemical (Combustion method) and green route using Coccania grandis leaf extract (Probe sonication method). SEM reveals that, NiONPs synthesized using green route showed agglomerated porous, having diameter of 200 nm. Whereas, chemically synthesized NiO NPs were uniform in size with diameter of 180 nm. From PXRD analysis, average crystallite size of green and chemically synthesized NiONPs was found to be 52.6 nm and 41.9 nm respectively. NiO NPs synthesized using the green route. Antibacterial study of NiONPs (synthesized by green route) displayed maximum zone of inhibition i.e10.8mm (Staphylococcussp), 9.4mm (E coli) and 7.4mm (Pseudomonas) compared to 8mm (Staphylococcussp), 9mm (Ecoli). Photocatalytic activity of direct green dye was effective in NiO NPs synthesized by chemical (69.25%) compared to the green route (25.65%). In electrochemical analysis (biosensor), one reduction and one oxidation peak were observed and were highly effective in sensing Fe3+ under alkaline medium in green route NiO NPs.

Background: Nickel oxide nanoparticles (NiO-NPs) have recently been utilized in various advanced industrial fields like lithium-ion micro batteries, nanofibers, electrochromic devices, and several biomedical applications. NiO-NPs are classified as extremely toxic substances as they can cause long-term harm to the environment and aquatic life. Moreover, frequent and prolonged exposure can affect human and animal health, causing skin allergies and major toxic consequences, such as hepatorenal toxicity. Hesperidin (HSP) has been proven to possess anti-inflammatory, antioxidant, and free radical scavenging activities. Objective: This study aimed to investigate the underlying protective mechanisms and effects of HSP against NiO-NPs-induced hepatorenal toxicities in rats. Materials and Methods: Forty male Wistar rats were randomly divided into four groups (n = 10 in each). The first group served as a Control group. For 8 weeks, the second group was administered NiO-NPs (100mg/kg/day), and the third group was given HSP (100mg/kg/day) via oral gavage for both groups. The fourth group received NiO-NPs and HSP concurrently in the same oral daily doses and duration as the second and third groups. Results: NiO-NPs administration revealed a significant increase in plasma biomarkers of nephrotoxicity (urea, creatinine) and hepatotoxicity (ALT, AST) in NiO-NPs group compared to Control group (p < 0.05). In addition, NiO-NPs administration resulted in a substantial increase in malondialdehyde levels with a significant drop in catalase activity and GSH content in Group II. Also, a significant decreased expression of Nrf-2 and Bcl-2 mRNA levels and upregulation of TNF-α, NF-kβ and BAX in the liver and kidney of NiO-NPs group were also detected. Histologically, the liver and kidney of rats of NiO-NPs group showed significant histopathological disturbances, with a substantial increase in the proliferating cell nuclear antigen (PCNA) positive hepatocytes and renal tubular cells in the NiO-NPs group compared to Control and HSP groups (p < 0.05). In contrast, concomitant administration of HSP with NiO-NPs in group IV showed a significant biochemical, histopathological, and immunohistochemical improvement compared to NiO-NPs group. Conclusion: Co-administration of HSP with NiO-NPs significantly ameliorated most of the NiO-NPs-induced hepatorenal toxicities in male rats. [ABSTRACT FROM AUTHOR]

In this work, TiO2 nanotubes were synthesized electrochemically by anodization of pure Ti sheet in 0.5% HF and annealed in N2 atmosphere to obtain (TiO2 NTs‐N2) and then the nickel was deposited on the support TiO2 NTs by immersing TiO2 NTs in mesoporous sol–gel template Ni nanoparticles method for overnight and then annealed in N2 atmosphere to obtain the electrocatalyst NiO NPs/TiO2 NTs‐N2. The physicochemical characterizations of NiO NPs/TiO2 NTs‐N2 were performed by scanning electron microscopy (SEM) and X‐ray diffraction (XRD) analysis. The catalyst NiO NPs/TiO2 NTs‐N2 was electrochemically characterized in a basic solution of methanol by cyclic voltammetry (CV) measurement. XRD characterization indicates the presence of nickel oxide nanoparticles with a diameter less than 43 nm and regularly combined into TiO2 nanotubes. NiO NPs/TiO2 NTs‐N2 catalyst exhibited a remarkably high electrocatalytic activity and has high electrocatalytic stability for methanol electrocatalytic oxidation reaction. The electrochemical studies showed that NiO NPs/TiO2 NTs‐N2 in alcoholic basic solution exhibited higher catalytic activity and stronger poisoning tolerance for methanol oxidation than that in nonalcoholic basic solution. This suggests that the NiO NPs catalyst supported on TiO2 NTs‐N2 has promising potential applications in electrocatalyst reactions. Nickel oxide supported on the conductive support TiO2 NTs‐N2 is used as an electrocatalyst in alkaline fuel cells. Results showed the best improvement in the physico‐chemical properties of these catalysts in comparison with previous studies. [ABSTRACT FROM AUTHOR]

Aims: Present study demonstrates dose and time dependent effects of NiONPs (<30 nm) on the ovaries of Wistar rat., Methods: Female rats were gavaged NiONPs or NiOMPs (5 mg/kg b.w.) for 24 h, 15 days and 30 days, euthanized and ovaries thus removed were analyzed for nickel bioaconcentration and processed for scanning electron microscopy. Serum samples were analyzed to compare the effects of nickel nano & microparticles on progesterone and estradiol values., Results: Results confirmed the bioaccumulation of Ni in ovarian tissue. Its concentration was higher in NiONPs treated rats than NiOMPs treated rats. Progesterone level increased whereas estradiol values decreased in NiONPs and NiOMPs treated rats. SEM results also exhibited dose dependent effects on the morphology of corpoluteal complex. The structural changes varied from formation of blebs to distorted microvilli and germinal epithelium., Conclusion: It is hypothesized that NiONPs/NiOMPs are biodegraded into smaller fragments that conjugate with amino acids and or alter downstream signaling pathways, generate ROS and modulate protein structure activity relationships. Finally, these processes manifest into morphological alterations in the ovary. Biopersistence of nickel in female reproductive system may compromise with fertility and reproductive performance of exposed population., Competing Interests: Declaration of Competing Interest The authors declare that they have no conflict of interest., (Copyright © 2024 Elsevier Ltd. All rights reserved.)

Background: Nickel oxide nanoparticles (NiO-NPs) have recently been utilized in various advanced industrial fields like lithium-ion micro batteries, nanofibers, electrochromic devices, and several biomedical applications. NiO-NPs are classified as extremely toxic substances as they can cause long-term harm to the environment and aquatic life. Moreover, frequent and prolonged exposure can affect human and animal health, causing skin allergies and major toxic consequences, such as hepatorenal toxicity. Hesperidin (HSP) has been proven to possess anti-inflammatory, antioxidant, and free radical scavenging activities.Objective: This study aimed to investigate the underlying protective mechanisms and effects of HSP against NiO-NPs-induced hepatorenal toxicities in rats.Materials and Methods: Forty male Wistar rats were randomly divided into four groups (n = 10 in each). The first group served as a Control group. For 8 weeks, the second group was administered NiO-NPs (100 mg/kg/day), and the third group was given HSP (100 mg/kg/day) via oral gavage for both groups. The fourth group received NiO-NPs and HSP concurrently in the same oral daily doses and duration as the second and third groups.Results: NiO-NPs administration revealed a significant increase in plasma biomarkers of nephrotoxicity (urea, creatinine) and hepatotoxicity (ALT, AST) in NiO-NPs group compared to Control group (p < 0.05). In addition, NiO-NPs administration resulted in a substantial increase in malondialdehyde levels with a significant drop in catalase activity and GSH content in Group II. Also, a significant decreased expression of Nrf-2 and Bcl-2 mRNA levels and upregulation of TNF-α, NF-kβ and BAX in the liver and kidney of NiO-NPs group were also detected. Histologically, the liver and kidney of rats of NiO-NPs group showed significant histopathological disturbances, with a substantial increase in the proliferating cell nuclear antigen (PCNA) positive hepatocytes and renal tubular cells in the NiO-NPs group compared to Control and HSP groups (p < 0.05). In contrast, concomitant administration of HSP with NiO-NPs in group IV showed a significant biochemical, histopathological, and immunohistochemical improvement compared to NiO-NPs group.Conclusion: Co-administration of HSP with NiO-NPs significantly ameliorated most of the NiO-NPs-induced hepatorenal toxicities in male rats.