Department of Chemistry and BioScience, Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, 890-0065, Japan.
Department of Chemistry and BioScience, Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, 890-0065, Japan.
Colloids Surf B Biointerfaces. 2019 Jan 1;173:242-248. doi: 10.1016/j.colsurfb.2018.09.055. Epub 2018 Sep 27.
Gold and silver nanoparticles were prepared from the green tea and black tea extracts of the leaves of Camellia sinensis. The metal nanoparticle solutions were obtained by reacting HAuCl or AgNO aqueous solutions with aqueous NaHCO and tea leaf extracts, which were obtained from used tea leaves at low temperature, under ambient conditions. The nanoparticles were stable at room temperature and had a uniform particle size (Au: ∼10 nm, Ag: ∼30 nm). Nanoparticle-immobilized cotton cloths were then prepared, which displayed high antibacterial activity and a characteristic color, thereby showing potential application as antimicrobial pigments. This study provides a means of utilizing used tea leaves, which would otherwise be considered waste products.
采用绿茶和红茶的茶叶（来自于低温度处理过的废茶叶）提取液作为还原剂和保护剂，通过柠檬酸钠和金银盐的还原反应，制备了金银纳米粒子。纳米粒子在室温下稳定，且具有均匀的粒径（Au：约 10nm，Ag：约 30nm）。然后制备了纳米粒子固定在棉布上，这种固定有纳米粒子的棉布显示出了较高的抗菌活性和特征颜色，因此可能作为抗菌颜料使用。本研究提供了一种利用废茶叶的方法，否则这些茶叶可能会被当作废物处理。
