The gold nanoparticles (AuNPs) have been synthesized by a green chemical approach using the biopolymer pectin which is isolated from the orange peel. The pectin-AuNPs nanoconjugates are attached on the PLA-PEG-PLA triblock copolymer matrix by the ultra-sonication induced water-in-oil (W/O) emulsion method. The pectin-AuNPs-PLA-PEG-PLA nanoconjugates are characterized by UV-Visible absorption spectroscopy, X-Ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), energy dispersive X-Ray spectroscopy (EDS) and X-Ray photo electron spectroscopy (XPS). The XPS results confirm the zero oxidation state of Au, while the TEM images confirm the spherical shape of 7–13 nm of AuNPs. The XRD analysis reveals that the AuNPs exhibit fcc crystal structure with an average crystallite size of 12 nm. The biocompatibility of the pectin-AuNPs-PLA-PEG-PLA nanoconjugates has been investigated by the In Vitro cell line study on South African green monkey’s kidney cells. The anti-inflammatory activity of the nanoconjugates has been established by the membrane stabilization and inhibition of protein denaturation methods. The pectin-AuNPs-PLA-PEG-PLA nanoconjugates exhibit better anti-inflammatory activity than pectin and pectin-AuNPs.

Silver nanoparticles (AgNPs) were synthesized through a green chemical approach using the piperine isolated from black pepper. The physicochemical properties of Triton X-100 coated silver nanoparticles (Triton X-100/Ag NPs) were well characterized by ultraviolet-visible absorption spectroscopy (UV-Vis), powder X-ray diffraction (PXRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and energy dispersive X-ray spectroscopy (EDS). The TEM images confirmed the spherical shape of silver nanoparticles. The powder X-ray diffraction analysis revealed the silver nanoparticles exhibiting face-centered cubic (fcc) crystal structure with an average crystallite size of 15 nm. The cytotoxicity effects on HepG2 cells were also evaluated with a series of 3-(4,5-dimethylthiazolyl-2)-2,5-diphenyltetrazolium bromide (MTT) assay. The effective toxic concentration of Triton X-100/piperine with silver nanoparticles was too low to damage HepG2 cells. The antibacterial activity results showed that the Triton X-100/piperine/AgNPs efficiently inhibited the two bacteria namely S. aureus and E. coli. The Triton X-100/piperine/AgNPs nanoconjugates were effective in inhibiting the growth of both gram-positive and gram-negative bacteria S. aureus and E. coli.

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In this research, gold nanoparticles (Au NPs) were synthesized by a green chemical approach using the organic natural product piperine isolated from the black pepper. The piperine-Au NPs attached on the Triton X-100 and they were characterized by ultraviolet-visible absorption spectroscopy (UV-Vis), dynamic light scattering spectroscopy (DLS), X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDS). The TEM analysis confirmed the spherical shape of Au NPs with a diameter of 17-30 nm. The XRD analysis revealed that the Au NPs exhibited fcc crystal structure with an average crystallite size of 26 nm. The biocompatibility of the piperine-AuNPs-Triton X-100 nanoconjugates were examined on Hep-G2 cells. The piperine-AuNPs-Triton X-100 nanoconjugates exhibited better anti-oxidant activity.

1 H NMR, 13 C NMR, mass spectral and elemental analysis data are used to synthesize and characterize photosensitive imidazole derivative of 1-(4-Fluorophenyl)-2-(Naphthalen-1-yl)-4, 5-Diphenyl-1H-Imidazole [FNDI]. Nano crystalline ZnO synthesized by sol-gel method is characterized by absorption (UV), fluorescence (PL), Fourier-Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM) and Energy Dispersive X ray Spectroscopy (EDS). The nanocrystalline ZnO surface is bounded by the imidazole derivative. Fluorescence enhancement is explained based on Photo-induced Electron Transfer (PET) method, and calculation of apparent binding constant is done. Due to the ligand adsorption on the ZnO nanoparticle, the LUMO and HOMO energy levels of imidazole derivative are lowered, and strong adsorption occurs due to the chemical affinity between the N 2 atom of the imidazole derivative and the Zn ion. Fluorescence enhancement occurs due to the electron injection from photo excited imidazole derivative to the ZnO conduction band.