Although there are many ways to prepare tea catechins, the solvent extraction and the iron-precipitation are mainly applied in the industrial technology.

制备儿茶素的方法很多，但目前工业化制备技术主要集中于溶剂萃取法和金属离子沉淀法。

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Lignocellulose was prepared from cedar sawdust and used to isolate caffeine and tea catechins from tea extract by static adsorption and gradient elution using water and 80% ethanol.

以杉木屑为原料制备木质纤维素，采用静态吸附、蒸馏水和80%乙醇分段洗脱等实验，研究其对茶儿茶素类及咖啡因选择性吸附作用。

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CONCLUSION It indicated that tea catechins had protective effects on the injury of cerebral ischemia and reperfusion in rats, and these effects may be related to calcium concentrations in brain.

结论茶儿茶素可能通过降低脑细胞内钙离子浓度，保护脑组织对抗缺血再灌注损伤。

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