Biological Activity of Bimetallic Ag/Cu-NPs Produced from the Aqueous Extract of the Fungus Hericium erinaceus: Prospects for Potential Antimicrobial and Antitumor Tools

Green synthesis of nanoparticles using biological extracts has emerged as a sustainable alternative to conventional physicochemical methods, as it provides eco-friendly reducing and stabilizing agents. In this study, silver–copper bimetallic nanoparticles (Ag/Cu-BNPs) were biosynthesized using an aqueous extract of the medicinal mushroom Hericium erinaceus, and their biological properties were evaluated. Three nanoparticle formulations (M1–M3), differing only in the proportion of H. erinaceus extract, were analyzed and selected based on their optical response in UV–Vis spectroscopy. The synthesized nanoparticles were characterized by UV–Vis spectroscopy, FTIR, TEM, and EDS. Antibacterial activity was assessed against Escherichia coli and Staphylococcus aureus using standard methods, while cytotoxicity was evaluated in cancer cell lines (Caco-2, HT-29, A549, MCF-7) and a normal fibroblast line (HDFn). The synthesized Ag/Cu-BNPs were quasi-spherical with an average size of 9.3 ± 3.4 nm, calculated from TEM image analysis of over 900 particles. They exhibited significant antibacterial activity, particularly against S. aureus, and showed dose-dependent cytotoxicity, with Caco-2 cells being the most sensitive. Notably, the nanoparticles displayed greater selectivity toward cancer cells compared to normal fibroblasts, suggesting potential biomedical applications in antimicrobial and antitumor therapies. These results suggest that H. erinaceus extract is an effective biogenic agent for Ag/Cu-BNP synthesis, and that the resulting nanoparticles possess antimicrobial and cytotoxic properties that warrant further investigation for potential biomedical applications.