Copyright (c) 2026 Ahmed Najm, douglas Law, Chang Sook Keng, Loh Chee Keat, Manzoor Hussain, Muhammad Yasin, Sarantuya Durakhol, shazrul fazry

This work is licensed under a Creative Commons Attribution 4.0 International License.
Tropical Phytochemicals in ZnO Nanoparticle Synthesis: Antibacterial Action, UV Protection and Future Perspectives
Corresponding Author(s) : Ahmed Abdulkareem Najm
Asian Journal of Chemistry,
Vol. 38 No. 8 (2026): Vol 38, Issue 8 (2026)
Abstract
Zinc oxide nanoparticles (ZnO NPs) are widely studied with diverse applications in biomedicine, cosmetics and environmental technologies due to their unique physico-chemical properties, including a tunable bandgap (3.2-3.4 eV), high exciton binding energy (~60 meV) and strong photocatalytic activity. Conventional synthesis methods often rely on toxic chemicals and energy-intensive conditions, whereas plant-mediated green synthesis offers a sustainable and eco-friendly alternative. This review systematically evaluates and focused only on the biosynthesis of ZnO NPs using tropical plant extracts, with particular emphasis on the roles of phytochemicals including flavonoids, phenolic acids, terpenoids and alkaloids, in regulating nanoparticle nucleation, growth and stabilisation. Current evidence indicates that ZnO NPs formation primarily follows a hydrolysis–dehydration pathway involving zinc hydroxide intermediates rather than the direct reduction of Zn2+ to metallic zinc. Comparative analysis of reported studies shows that green-synthesised ZnO NPs typically exhibit particle sizes of 10-50 nm and demonstrate strong antibacterial activity (MIC 22-40 µg/mL) through reactive oxygen species generation, membrane disruption and metabolic interference. In addition to antimicrobial activity, ZnO NPs provide broad-spectrum UV protection and have potential applications in drug delivery, wound healing and active food packaging. Despite these advantages, challenges remain in standardizing synthesis, achieving scalability and evaluating long-term safety. Future research integrating artificial intelligence–assisted optimisation and hybrid nanocomposite design may improve the reproducibility and functional performance of plant-mediated ZnO nanomaterials for sustainable biomedical and industrial applications.
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