It was formerly derived by fermentation of carbohydrates but is now made synthetically by aldol condensation of acetaldehyde or by oxidation of petroleum gases.
以前它是由碳水化合物发酵得到，现在由乙醛醛醇缩合或石油气体氧化的合成方法制得。
Results of enzymatic oxidation showed that the highest content of theaflavins (15.05%) was formed at 80 minutes fermentation with polyphenol oxidase.
酶促氧化结果表明，发酵80分钟时，茶黄素的生成量最高(为15.05%)。
It was proved that catechin and epicatechin had a leading role during the final fermentation and storage of ciders in the process of non-enzymatic oxidation.
说明在非酶促氧化过程中，儿茶素和表儿茶素是在苹果酒酿造后期及陈酿过程中起主要作用的酚类物质。
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