In recent years, several eco-friendly processes for the synthesis of silver nanoparticles (AgNPs) are increasing; they have tremendous applications in the field of diagnosis and therapeutic values for various diseases /disorders. In this article the green synthesis of Datura stramonium leaves extract silver nanoparticles (DS-AgNPs) was carried out and are characterized for different properties like reduction of Ag + to Ag◦, absorption maxima, functional group of secondary metabolites, crystalline structure, morphology, and size by using UV-Vis spectroscopy, fourier transform infrared spectroscopy (FITR) X-ray spectroscope (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM) respectively. Further the effects of DS-AgNPs on WT Park TM3 SB and WI Park 25 Parkinson’s mutant Drosophila melanogaster was assessed by the Negative geotaxis assay and PINK 1 gene expression. Treatment with DS-AgNPs exhibited increased geotaxis behavior and with a positive survival percentage, finally PINK1 was found to be down regulated as the treatment concentrations increased in WI Park 25 mutant but up regulated in WT Park TM3 SB mutant PD model. Although more molecular mechanism needs to be understood, however the use of DS-AgNPs can be a promising treatment strategy for the PD.
An efficient and economical one-pot synthesis of pyrano [2,3-c] pyrazoles and pyrazolyl-4H-chromenes using Water Extract of Mango Peel Ash (WEMPA) as a natural aqueous medium catalysts under microwave irradiation described. The microwave irradiation enhances the rate of the reaction, and decreases by-product formation. The catalyst is obtained from the agro-waste feedstock, by simple thermal treatment of dry peel of mango fruit followed by extraction of the resulted ash in water gave catalytic green solvent medium. In continuation of our research work on developing green chemistry protocol for bioactive molecule synthesis, herein, first time described pyrano[2,3-c]pyrazole and pyrazolyl-4H-chromene derivative synthesis by the reaction of hydrazine hydrate (1), malononitrile (2), ethyl acetoacetate (3), aryl aldehydes (4), and/or salicylaldehyde (5). Some of the selected pyrano[2,3-c]pyrazole ( 6) and pyrazolyl-4H-chromene (7) derivatives are tested for their in vitro antioxidant activity (free radical scavenging) by DPPH assay method. The assay result revealed, compounds 6 a, 6 h, 6 i and 7 d showed significant antioxidant activities comparison with refrence ascorbic acid. Some of the selected derivatives are characterized by FT-IR, 1 H-, 13 C-NMR and mass spectrometry analysis, and also tested for their electrochemical behavior studies using a cyclic voltammetry.[a] K.
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