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The interest of many has been attracted by plant-mediated synthesizing procedures for nanoparticles since they provide certain qualities including being cost-effective, quick, and compatible with the environment. In this regard, this work introduces the production of selenium-nanoparticles (Se-NPs) in a biological manner utilizing aqueous extracts of Rosmarinus officinalis (R. officinalis). Production of Se-NPs was confirmed using UV-visible (UV-Vis) spectrophotometry. Also, dynamic light scattering (DLS) analysis was used for determination particle size distribution, while we distinguished the identification of crystalline construction of nanoparticles through the means of X-ray diffraction (XRD) pattern, DLS, and transmission electron microscopy (TEM) examination indicated that Se-NPs are often spherical with a size about 20 to 40 nm. The minimum inhibitory concentration (MIC) of the synthesized Se-NPs by R. officinalis extract against Mycobacterium tuberculosis (M. tuberculosis), Staphylococcus aureus (S. aureus), Streptococcus mutans (S. mutans), Escherichia coli (E. coli), and Pseudomonas aeruginosa (P. aeruginosa) was 256, 16, 32, 128, and 64 µg/mL, respectively. The synthesized Se-NPs had no significant effect on Mycobacterium simiae (M. simiae) and had exhibited a strong antimicrobial functionality towards the gram-positive and gram-negative bacteria and can stand as a potent antibacterial agent.

Green synthesis of selenium nanoparticles (Se-NPs) was done using Abelmoschus esculentus extract as the capping and reducing agent and sodium selenite (Na2SeO3) as the selenium source. UV-Vis spect...

A great deal of attention has been paid to developing methods for heterogenizing homogeneous catalysts in order to combine the advantages of both homogeneous and heterogeneous catalysis.1 Among the...

Herein, the novel synthesis, characterisation and further application of magnetic multi-walled carbon nanotubes modified with polyamidoamine (PAMAM) dendrimers (MMWCNTs-D-NH2) as highly sensitive and selective recognition element in sensor development for the electrochemical determination of As(III) in water matrices is presented. The synthetized nanomaterials were characterised by Fourier transform- infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and transmission electron microscopy (TEM) analysis. Thus, the glassy carbon electrode (GCE) was subjected to functionalisation with the MMWCNTs-D-NH2 to produce the sensor. Electrochemical impedance spectroscopy (EIS) and cyclic voltammetric (CV) measurements were performed to characterise the surface of modified electrode. The electrochemical performances of the developed sensor towards different concentration of As(III) were studied by square wave anodic stripping voltammetric (SWASV) measurements. The sensor shown its high sensitivity and selectivity against possible interferents, such as Hg(II), Pb(II), Cd(II), Cu(II). The limit of detection (LOD) was found to be 0.46 µgL−1. The suitability of the proposed sensor in spiked water samples (drinking, tap and mineral water) is also discussed.

In this study, magnetic multi-walled carbon nanotubes were functionalized with polyamidoamine (PAMAM) dendrimers and modified with butylsulfonate to afford MMWCNTs-D-(CH2)4-SO3H. The synthesized nanocomposite (MMWCNTs-D-(CH2)4-SO3H) was characterized by various techniques such as Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and thermo-gravimetric analysis (TGA). This nanocomposite catalyst effectively catalyzed four and three component reactions for the synthesis of dihydro-1H-Indeno[1,2-b] pyridines and tetrahydrobenzo[b] pyrans (85–98% yield in 15–20 min and 80–98% yield in 12–30 min, respectively). In addition, the magnetically recoverable catalyst could be easily recycled at least five times without significant loss of catalytic activity. In the first step of synthesis of nanocomposite the Fe3O4 nanoparticles were deposited on oxidized MWCNTs, then a modified PAMAM dendrimer was used to bond to the carbonyl groups. Finally MMWCNTs-D-NH2 functionalized with 1,4‐butanesultone.