Green Synthesis of Antibacterial Silver Nanocolloids with Agroindustrial Waste Extracts, Assisted by LED Light

Herein, the green synthesis of silver nanoparticles (AgNPs), assisted by LED light, using aqueous extracts agroindustrial waste products, such as avocado seeds (ASs), cocoa pod husks (CPHs), and orange peels (OPs), is presented. Surface plasmon resonance analysis showed faster complete NP formation when irradiated with blue light. Green red light irradiation non- limited nanoparticle formation. TEM analyses confirmed semispherical morphology synthesized AgNPs, exception OP–AgNPs, which agglomeration during irradiation. For AS–AgNPs CPH–AgNPs, average particle diameter was about 15 nm. Interestingly, CPH extract demonstrated compared to AS (100 min vs. 250 time, respectively). FTIR spectroscopy assessed involvement diverse functional groups bioactive phytochemicals present in plant photobiosynthesis. The antioxidant activity, determined ferric reducing power (FRAP) assay, varied from 1323.72 µmol TE/mL 836.50 extract. total polyphenol content according Folin–Ciocalteu procedure; exhibited a higher (1.54 mg GAE/g) than did (0.948 GAE/g). In vitro antibacterial assays revealed that promising properties against pathogenic bacteria (E. Coli), whereas CPH–AgNPs activity S. aureus E. coli. AgNPs AS, CPH, OP reported this work environmentally friendly cost-effective, it paves way for future studies related valorization production advanced nanomaterials, potential biomedical, industrial, environmental applications.