The present study described the synthesis of biocompatible Zinc oxide nanoparticles from the zinc acetate through eco-friendly green process using leaf extract of Cassia auriculata leaf and their antibacterial activity. The green synthesized ZnO nanoparticles were characterized by Fourier-transform infrared (FTIR) spectroscopy, Ultra violet visible spectroscopy, Photoluminescence spectroscopy, X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM). FTIR studies confirm the presence of bio molecules and metal oxides. The calculated optical band gap values of the material to be around 3.3 eV. PL spectrum study revealed the optical properties of ZnO NPs. The biosynthesized nanoparticle synthesized from leaf extract of Cassia auriculata exhibited strong antibacterial activity Bacillus subtilis, Klebsiella pneumonia, Pseudomonas aeruginosa and Proteus mirabilis. Thus, it may be used in the surface coating of food package to prevent the bacterial contamination.

本研究描述了利用肉桂叶的叶提取物通过生态环保的绿色工艺从醋酸锌合成生物相容性氧化锌纳米颗粒及其抗菌活性。通过傅立叶变换红外（FTIR）光谱，紫外可见光谱，光致发光光谱，X射线衍射（XRD），扫描电子显微镜（SEM）对绿色合成的ZnO纳米粒子进行了表征。FTIR研究证实了生物分子和金属氧化物的存在。该材料的计算出的光学带隙值约为3.3 eV。PL光谱研究揭示了ZnO NP的光学性质。决明子叶提取物合成的生物纳米粒子表现出较强的抗菌活性，枯草芽孢杆菌，肺炎克雷伯菌，铜绿假单胞菌和奇异变形杆菌。因此，它可以用于食品包装的表面涂层中以防止细菌污染。