Search

Hydroxyapatite (HAp) nanocomposite particles were prepared simply in the presence of polyethylene glycol (PEG) and fabricated with silver via a sol–gel route and the physico-chemical and biological properties of these materials were investigated. The objective of this study is to inspect the crystallinity and antibacterial activity of these composite materials. PEG has been used to greatly promote biocompatibility and biodegradability of HAp. Silver nanoparticles were used for improving its bactericidal efficacy while applying composites. Nano-sized HAp composite particles with PEG and nano-silver was incorporated to increase the crystalline nature of the nanocomposite. The structure of nanocomposite particles was studied by XRD, FTIR, HR-SEM, EDS and TEM analyses. Silver nanoparticles loaded on the synthesized HAp-PEG showed a synergistic antibacterial effect against Gram-negative bacterium Escherichia coli ( E. coli ). The controlled release of Ag + ion from HAp-PEG-Ag nanocomposite has given good antibacterial efficacy evidenced by epi-fluorescence microscopy images during different hours. [ABSTRACT FROM AUTHOR]

Exhausted reactive dye bath of light yellow and blue shades were collected from cotton knit wear dyeing units in Tirupur and ozonated in a column reactor system at the rate of 0.16g/min to assess its efficiency in reducing the color, chemical oxygen demand and total organic carbon. The potential for repeated reuse of the decolorized dye bath was also studied. Color removal of the effluent was achieved in 5min contact time for yellow and blue shades at an ozone consumption of 37.5 and 36mg/L, respectively. It is concluded that ozonation is efficient in decolorization of exhausted dye bath effluents containing conventional reactive dyes. However, the corresponding removal of COD was not significant. Maximum for yellow and blue shades, COD removal was achieved in 20 and 40min contact time at an ozone consumption of 65.8 and 76.5mg/L, respectively. The COD removal was 51% for blue and 48% for yellow shades, while the TOC removal efficiency was 51 and 42% for blue and yellow shades, respectively. The dyeing quality was not affected by the reuse of decolorized dye bath for two successive cycles. [Copyright &y& Elsevier]

The eco-friendly synthesis of Yb 2 O 3 and IL-Yb 2 O 3 NPs was performed by A ndrographis Paniculata leaves extract. The XRD pattern described the crystalline behavior and the crystallite size was at 50 and 45 nm for Yb 2 O 3 and IL-Yb 2 O 3 NPs. The FTIR and Raman analyses illustrated the functional groups of Yb 2 O 3 and IL-Yb 2 O 3 NPs. The UV–visible analysis described the formation of synthesized NPs with the absorption peak at 227 and 239 nm. The photoluminescence study revealed the yellow color luminescent behavior of Yb 2 O 3 and IL-Yb 2 O 3 NPs. The formation of IL-Yb 2 O 3 NPs with 25–75 nm particle size was revealed from DLS analysis. The SEM analysis explained the circular and rectangular morphology of Yb 2 O 3 and IL-Yb 2 O 3 NPs. The composition analysis of EDX showed the purity of Yb 2 O 3 and IL-Yb 2 O 3 NPs with the presence of only Yb and O peaks and also chemical elements of IL-Yb 2 O 3 NPs was confirmed by XPS analysis. The HRTEM analysis explained the hexagonal structured formation of Yb 2 O 3 and IL-Yb 2 O 3 NPs. The antibacterial assay described the high inhibition of Yb 2 O 3 and IL-Yb 2 O 3 NPs on E.coli and S.aureus bacteria. The anti-diabetic assay revealed the biomedical behavior of Yb 2 O 3 and IL-Yb 2 O 3 NPs on α- Amylase. The anti-inflammatory assay found the potential denaturation of bovine serum albumin (BSA) by Yb 2 O 3 and IL-Yb 2 O 3 NPs. The antioxidant assay revealed the potential free radical scavenging behavior of Yb 2 O 3 and IL-Yb 2 O 3 NPs. The MTT assay found the biomedical potential action of Yb 2 O 3 and IL-Yb 2 O 3 NPs on the MCF-7 cancer cell line. [Display omitted] • The Yb 2 O 3 and IL-Yb 2 O 3 NPs were synthesized by Andrographis paniculata leaves extract. • The hexagonal structured NPs were showed by HRTEM analysis. • The EDX analysis showed the presence only Yb and O peak. • The anti-diabetic, anti-inflammatory assays showed the biomedical behavior of Yb 2 O 3 and IL-Yb 2 O 3 NPs. • The MTT assay showed the biomedical behavior of Yb 2 O 3 and IL-Yb 2 O 3 NPs with low dose based concentration. [ABSTRACT FROM AUTHOR]

• Neodymium oxide NPs were synthesized by greener solvothermal method using A.paniculata leaves extract as reducing agent. • IL of 1-butyl 3-methyl imidazolium hexafluorophosphate was used to improve the morphology of Nd 2 O 3 NPs. • Nd 2 O 3 NPs has the binding energy of 3d 3/2 and 3d 5/2 orbital at 1010 eV and 983 eV. • IL mediated Nd 2 O 3 NPs shows the potent anticancer activity against MCF-7 breast cancer cells. Plant mediated synthesis of nanoparticles (NPs) plays a prominent role in the field of pharmaceutical and biomedical applications. In the present work, the leaves extract of 'Andrographis paniculata' was used as a reducing agent for the synthesis of neodymium oxide (Nd 2 O 3) and ionic liquid assisted neodymium oxide (Nd 2 O 3 -IL) NPs. The ionic liquid of 1-butyl 3-methyl imidazolium hexafluorophosphate [BMIM PF 6 is used as a stabilizing agent to improve the morphology and surface nature of Nd 2 O 3 NPs. The crystallinity and structure of Nd 2 O 3 and Nd 2 O 3 -IL NPs were analyzed by X-ray diffraction (XRD) pattern. The optical emission peak of the NPs was found to be 480, 532, 595 and 675 nm. The chemical compositions of Nd 2 O 3 and Nd 2 O 3 -IL NPs were analyzed using energy dispersive X-ray (EDX) spectrum. The XPS analysis revealed that the binding energies of neodymium correspond to 3d 3/2 , 3d 5/2 , and 4d orbitals. The antibacterial activity of the NPs was tested against the bacterial strains of Staphylococcus aureus and Escherichia coli. The antioxidant, anti-inflammatory and anti-diabetic activities with standard drugs were tested by the synthesized Nd 2 O 3 and Nd 2 O 3 -IL NPs. The anticancer activity of Nd 2 O 3 and Nd 2 O 3 -IL NPs confirmed the concentration based mitochondria dehydrogenize in MTT assay against MCF-7 breast cancer cells. [ABSTRACT FROM AUTHOR]

Highlights: [•] First time [Bmim][TfO] IL is used for the Fe3O4 nanoparticle synthesis. [•] Novel method tunes Fe3O4 nanocubes and nanoflakes forms influenced by the base and IL. [•] Fe3O4 oxidized topotactically into γ-Fe2O3 nanoparticles by annealing and base. [•] Uniform morphology with average size of 33nm negligible superstructure are formed. [•] Ms values are characterized by thin layer of γ-Fe2O3 on the nanoparticle surface. [ABSTRACT FROM AUTHOR]

A novel biomimetic f-HAp/PVP/Ag nanocomposite was synthesized under the ionic liquid medium, which was composed of inorganic and organic nanofillers like fluor-hydroxyapatite, silver nanoparticles and polyvinyl pyrrolidone. In composite synthesis, the first time we were used fluorine based ionic liquid for the fluorine contents on the fluor-hydroxyapatite nanoparticles which were resulting in very good crosslinking and interfacial bonding with the PVP and Ag nanoparticles. Ionic liquid has assisted good morphological structure of both inorganic materials. The chemical interaction and crystallinity changes of the nanocomposite were evaluated by FTIR and XRD studies. The surface morphology and composition of the samples were observed by FE-SEM, HR-TEM and EDS analyses. This report reveals that the greener approach for synthesis of fluor-hydroxyapatite nanocomposite and sustained delivery of silver and fluorine ions from the fluor-hydroxyapatite surface to the bacterial surface have been reducing the bacterial growth rate which was evaluated by different pathogenic bacterial strains via different methods and it also favourable cytotoxicity effect with human osteosarcoma (MG-63) cells. [ABSTRACT FROM AUTHOR]

Abstract: In the present investigation, we report a sustainable novel green synthetic strategy to synthesis zinc oxide nanocrystals. This is the first report on sustainable biosynthesis of zinc oxide nanocrystals employing Nephelium lappaceum L., peel extract as a natural ligation agent. Green synthesis of zinc oxide nanocrystals was carried out via zinc-ellagate complex formation using rambutan peel wastes. The successful formation of zinc oxide nanocrystals was confirmed employing standard characterisation studies. A possible mechanism for the formation of ZnO nanocrystals with rambutan peel extract was also proposed. The prepared ZnO nanocrystals were coated on the cotton fabric and their antibacterial activity were analyzed. ZnO nanocrystals coated cotton showed good antibacterial activity towards Escherichia coli (E. coli), gram negative bacteria and Staphylococcus aureus (S. aureus), gram positive bacteria. [Copyright &y& Elsevier]

Abstract: Sulfated β-cyclodextrin was synthesized from sulfonation of β-cyclodextrin and sulfated polymer was crosslinked with cotton fabric using ethylenediaminetetraacetic acid as crosslinker. ZnO, TiO2 and Ag nanoparticles were prepared and characterized by XRD, UV, DLS, SEM and PSA. The prepared nanoparticles were coated on crosslinked cotton fabric. The crosslinking and nanoparticles coating effects of cotton fabrics were studied by FTIR and SEM analysis. The antibacterial test was done against gram positive Staphylococcus aureus and gram negative Escherichia coli bacterium. [Copyright &y& Elsevier]