Theaflavins are reddish-orange black tea pigments with a benzotropolone chromophore, and their various biological activities have been reported. Theaflavins are produced by oxidative coupling between catechol-type and pyrogallol-type catechins via bicyclo[3.2.1]octane-type intermediates. In this study, a new method for nonenzymatic biomimetic synthesis of theaflavins was developed using the DPPH radical as an oxidizing agent.

中文翻译：

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红茶色素茶黄素的非酶促仿生合成

茶黄素是具有苯并托酚酮发色团的红橙色红茶色素，已经报道了它们的各种生物活性。茶黄素是由儿茶酚型和邻苯三酚型儿茶素通过双环 [3.2.1] 辛烷型中间体氧化偶联产生的。在这项研究中，使用 DPPH 自由基作为氧化剂开发了一种非酶促仿生合成茶黄素的新方法。