GREEN SYNTHESIS AND ANTIOXIDANT ACTIVITY OF NANO ZINC OXIDE NANOPARTICLES USING POLYPHENOL EXTRACT FROM GREEN TEA LEAVES IN THAI NGUYEN

Khiếu Thị Tâm

doi:10.34238/tnu-jst.12301

GREEN SYNTHESIS AND ANTIOXIDANT ACTIVITY OF NANO ZINC OXIDE NANOPARTICLES USING POLYPHENOL EXTRACT FROM GREEN TEA LEAVES IN THAI NGUYEN

About this article

Received: 13/03/25 Revised: 08/04/25 Published: 12/04/25

Authors

Khieu Thi Tam , TNU - University of Sciences

Abstract

Green tea (Camellia sinesis) is a widely cultivated plant in Thai Nguyen, with polyphenols as its main components, exhibiting strong antioxidant properties. The synthesis of zinc oxide nanoparticles (ZnO NPs) using plant extracts has been extensively studied for biomedical applications. In this study, for the first time, ZnO NPs were synthesized using the polyphenol extract derived from tea leaves, and their antioxidant activity was evaluated. The characteristic properties of ZnO NPs were determined using UV-Vis DRS, FTIR, XRD, and TEM analyses. The ZnO NPs exhibited a hexagonal wurtzite crystal structure, spherical shape, with their surfaces functionalized by phytochemical groups present in the polyphenol extract. The ZnO NPs demonstrated significant DPPH free radical scavenging activity, with an IC₅₀ value of 12.62 ± 0.25 µg/mL. These findings confirm the potential of ZnO NPs synthesized using polyphenol-rich tea leaf extracts and their promising applications in antioxidant activity.

Keywords

Green tea; Polyphenol; Green synthesis; Zinc oxide nanoparticles; Antioxidant activity

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DOI: https://doi.org/10.34238/tnu-jst.12301

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