Green Synthesis of Silver Nanoparticles from Indonesian Medicinal Plants: Antibacterial and Biomedical Applications

Silver nanoparticles made from plant extracts — rather than harsh industrial chemicals — may offer a promising new weapon against drug-resistant bacteria, and Indonesian medicinal plants including Moringa oleifera are among the most studied sources. This semi-systematic review gathered and critically assessed a decade of published research (2015–2025) on so-called "green synthesis" of silver nanoparticles (AgNPs) from Indonesian plant species, asking whether the method works, how well the resulting particles kill bacteria, and whether the process is environmentally sound. The answer across the reviewed literature is cautiously encouraging. Researchers found that plant extracts reliably produce silver nanoparticles in the 5–50 nanometre size range — small enough to penetrate bacterial membranes — and that these particles attack bacteria through at least four distinct mechanisms: physically disrupting the cell membrane, releasing silver ions that poison bacterial enzymes, generating reactive oxygen species that damage cellular components, and interfering directly with bacterial DNA. Moringa oleifera was one of several Indonesian plants shown to mediate this synthesis successfully. Smaller particles coated with phenolic compounds from the plant extract tended to be the most potent antibacterial agents. Compared with conventional chemical synthesis routes, the plant-based method scored markedly better on standard green-chemistry metrics, meaning less toxic waste and lower production costs. However, the review also flags serious gaps: almost all tested particles were evaluated against standard laboratory bacterial strains rather than the real-world drug-resistant clinical isolates that make antimicrobial resistance so dangerous. There is also very little data on how these nanoparticles behave inside living organisms or what happens to them in the environment after use. The findings are relevant to anyone interested in moringa's industrial or biomedical potential beyond nutrition.