Abstract Polyphenols are a kind of vital biologically active substances in fruits and vegetables. In this study, with the reductive ability in the alkaline solution, eight polyphenols[(-)-Epigallocatechin gallate (EGCG), (-)-Epigallocatechin (EGC), (-)-Epicatechin gallate (ECG), (-)-Epicatechin (EC), (-)-Gallocatechin gallate (GCG), (-)-Gallocatechin (GC), (+)-Catechin (C) and Gallic acid (GA)] could produce silver nanoparticles(AgNPs) with [Ag(NH3)2]+. It was found that the AgNPs had intense surface plasmon resonance bands at 415 nm and RRS spectra signals at 450 nm, which were linearly related to the concentration of polyphenols. It was used for the spectrophotometric and RRS spectra determination of the former eight polyphenols with low detection limits. The developed method was applied for the determination of polyphenols in tea and products.

中文翻译：

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多酚和银对表面等离子体共振吸收和共振瑞利散射光谱的相互作用

摘要 多酚是水果和蔬菜中一种重要的生物活性物质。本研究以在碱性溶液中具有还原能力的八种多酚[(-)-表没食子儿茶素(EGCG)、(-)-表没食子儿茶素(EGC)、(-)-表儿茶素没食子酸酯(ECG)、(-)-表儿茶素(EC)、(-)-没食子儿茶素没食子酸酯 (GCG)、(-)-没食子儿茶素 (GC)、(+)-儿茶素 (C) 和没食子酸 (GA)] 可产生含 [Ag(NH3) 的银纳米粒子 (AgNPs) )2]+。结果发现，AgNPs 在 415 nm 处具有强烈的表面等离子体共振带，在 450 nm 处具有强烈的 RRS 光谱信号，这与多酚的浓度呈线性相关。用于前八种低检测限多酚的分光光度法和RRS光谱测定。建立的方法用于测定茶叶及制品中的多酚。