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 is worth mentioning that the drink without the oxidation of tea fermentation, the effect is more obvious, it is because of these active ingredients in tea tea to retain more of the reason.
值得一提的是，饮用未经氧化、发酵的普洱茶，其效果更为明显，这是因为这类茶叶保留茶叶中活性成份较多的缘故。
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。
Preparaing theaflavins from the oxidation of tea catechins in vitro simulated fermentation were studies. Two ways of preparing theaflavins was compared.
对儿茶素通过体外酶促氧化和化学氧化定向制备茶黄素进行了研究，并对两种制备途径进行了比较。
The pile fermentation promotes the further oxidation of the withered tea and leads the white tea to be sweeter.
渥堆促进萎凋叶的进一步氧化，使白茶更加甜醇。
The pile fermentation promotes the further oxidation of the withered tea and leads the white tea to be sweeter.
渥堆促进萎凋叶的进一步氧化，使白茶更加甜醇。
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