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Petroleum-based polymers have raised significant environmental concerns. It is critical to create compostable, good biocompatibility, and nontoxic polymers to replace petroleum-based polymers. Thus, this research was performed to extract the gelatin from fish waste cartilage and coated it over the surface of spherical shaped pre-synthesized ZnNPs along with a suitable plasticizer to produce the biodegradable film. The presence of gelatin on the surface of ZnNPs was first confirmed using UV–visible spectrophotometers, as well as the characteristic functional groups involved in the coating were investigated using Fourier-Transform Infrared Spectroscopy (FTIR). The morphological appearance of gelatin coated ZnNPs was ranged from 41.43 to 52.31 nm, the shape was found as platonic to pentagonal shape, and the fabricated film was observed through Scanning Electron Microscope (SEM). The thickness, density, and tensile strength of fabricated film were found to be 0.04–0.10 mm, 0.10–0.27 g/cm3, and 31.7 kPa. These results imply that the fish waste cartilage gelatin coated ZnNPs-based nanocomposite can be used for film preparation as well as a wrapper for food and pharmaceutical packaging. • Gelatin has been harvested successfully from fish waste cartilage. • The gelatin effectively coated the ZnNPs, resulting in the formation of a nanocomposite. • The size of the gelatin coated ZnNPs was found as 41.43–52.31 nm & platonic shape. • Thickness & density of the fabricated film were found as 0.10 mm & 0.27 g/cm3. • The tensile strength of the gelatin-coated ZnNPs-based biodegradable film was 31.7 kPa. [ABSTRACT FROM AUTHOR]

This research was performed to evaluate the silver nanoparticles (AgNPs) fabricating potential of aqueous shoot extract of Aristolochia bracteolata and also assess the free radicals scavenging potential of synthesized AgNPs. The results obtained from this study showed that the aqueous shoot extract of A. bracteolata has the potential to synthesize the AgNPs and it was initially confirmed by color change in the reaction blend as yellow to dark brownish. Subsequently, a clear absorbance peak was found at 425 nm in UV–visible spectrum analysis. The functional groups involved in the capping and stabilization of AgNPs were confirmed by Fourier Transform-Infrared spectroscopy (FTIR) analysis and recorded about 10 sharp peaks 3688, 3401, 2980, 2370, 1948, 1642, 1480, 1280, 782, and 628 cm−1. The Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM) observations revealed that the predominant shape of the AgNPs was spherical and size ranged from 41.43 to 60.51 nm. Interestingly, the green fabricated AgNPs showed significant free radicals scavenging activity and were confirmed with ferric reducing assay, 1, 1-diphenyl-2-picryl-hydrazyl (DPPH), H 2 O 2 radicals, and 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radicals scavenging activity. Thus, after a few in-vivo antioxidant studies, Aristolochia bracteolata -mediated AgNPs can be considered as an antioxidant agent. • The shoot extract of Aristolochia bracteolata has the potential to synthesize AgNPs. • Synthesized AgNPs were spherical in shape and size ranging from 41.43 to 60.51 nm. • The first report on AgNPs synthesized from A. bracteolata aqueous shoot extract. • AgNPs mediated by A. bracteolata demonstrated excellent antioxidant activity. • On antioxidant assays, the IC 50 of AgNPs ranged from 54.64 to 78.00 g mL−1 [ABSTRACT FROM AUTHOR]