The plant-based biological molecules possess exceptionally controlled assembling properties to make them suitable in the synthesis of metal nanoparticles. In the present study, an efficient simple one-pot method was employed for the synthesis of silver nanoparticles (SNPs) from the Rangoon creeper (RC) aqueous leaf extract. Biomolecules present in the leaf extract play a significant role as reducing agent as well as capping agent in the formation of RC-SNPs. The formation of RC-SNPs was confirmed by using several analytical techniques such as Fourier-transform infrared spectroscopy and ultraviolet-visible spectrophotometer studies. The presence of a sharp surface plasmon resonance peak at 449 nm showed the formation of RC-SNPs. X-ray diffraction analysis showed the crystalline nature of the RC-SNPs with a face-centred cubic structure. Elemental analysis of RC-SNPs was done by using energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. The morphology of RC-SNPs was examined by transmission electron microscopy (TEM) in the nano range 12 nm, and thermogravimetric-differential thermal analysis demonstrated the mechanical strength of RC-SNPs at various temperatures. The authors' newly synthesised RC-SNPs exhibited significant anti-bacterial activity against Staphylococcus aureus and Escherichia coli.

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A simple, low cost and environmentally bioreduction method was adopted to in situ generate silver nanoparticles (AgNPs) on the surface of cellulose cotton fabrics utilizing Tinospora cordifolia leaf extract as reducing agent. The bio generation of AgNPs in nanocomposite cellulose cotton fabrics (NCCFs) was confirmed by Fourier Transform Infrared spectroscopy, Scanning Electron Microscopy along with Energy Dispersive X-ray (EDX) spectroscopy, X-ray Diffraction (XRD), primary and derivative thermogravimetric (TG and DTG) analysis and Differential Scanning Calorimetry (DSC). The generated AgNPs in NCCFs were found to be spherical in shape with an average size of 90 nm. The presence of silver element was revealed by EDX spectra with an energy absorption peak at 3 keV. The bio synthesized AgNPs were found to be crystalline in nature from XRD. The bio generated AgNPs in NCCFs were found to be stable up to 399 °C as confirmed by DTG and DSC analysis. These NCCFs also exhibited good mechanical properties. Further, these also exhibited good antibacterial activity against pathogenic disease producing Gram positive (G +ve) and Gram negative (G −ve) bacteria. Basing on these properties, the prepared NCCFs can be considered for medical applications such as hospital bed materials, aprons etc. and also for packing applications.

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Objective: The motto of this research work was to synthesize the zinc oxide nanoparticles (ZnONPs) should be environmental friendly. Hence, it receives more attention toward the green route method.Methods: At last, the Ficus racemosa ZnONPs (FR-ZnONPs) were successfully synthesized using a simple protocol and eco favorable technique. This paper highlights the biosynthesis of ZnONPs using leaf extract of F. racemosa. Results: FR-ZnONPs formation was confirmed by the different spectral analysis such as UV-visible spectroscopy, Fourier transform-infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), and electronic dispersive X-ray spectroscopy. UV-visible studies revealed that the intrinsic band gap absorptions were at 372 nm and photoluminescence study showed that the blue emission at 492, 481, 473, and 450 nm and the green emission at 540 nm, respectively. FR-ZnONPs are wurtzite hexagonal structure with an average grain size of 15 nm was found from XRD analysis.Conclusion: FR-ZnONPs exhibited good antimicrobial efficacy on Escherichia coli and Staphylococcus aureus with various concentrations (100 μg/mL, 75 μg/mL, and 50 μg/mL) by disc diffusion method. The results showed the good antibacterial activity of FR-ZnONPs on G+ve and G-ve bacteria.