茶叶中有效成分综合提取的研究

以绿茶为原料，采用ZJL大孔离了交换树脂和ZJX大孔吸附树脂从茶叶的浸提液中提取茶氨酸、咖啡因、茶多酚和茶多糖。通过对树脂的静态、动态吸附性能的实验研究，确定了咖啡因、茶氨酸、茶多酚及茶多糖联合分离提取的工艺。研究结果表明：该工艺能有效的从茶叶中提取咖啡因、茶氨酸和茶多酚，提取的咖啡因纯度达83．23％，提取率为1．9％，茶氨酸纯度达85．43％，提取率为0．94％，提取的茶多酚纯度达95．62％，提取率为12．35％，且茶多酚中的咖啡因含量低于0．7％，茶多糖的纯度达51％，提取率为1．1％。

Study on Comprehensive Extraction of Tea Polyphenols, Cafeine, Theanine and Tea Polysaccharides

Tea caffeine, theanine polysaccharidcs and polyphenols were purified from the extract of green tea with ZJL macroporous cation exchange resin and ZJX macroporous adsorption resin with column chromatography respectively. The optimal operation conditions were obtained by the static and dynamic state experiments. Production rate and purity of caffeine were 1.9% and 83.23% respectively. Production rate and purity of theanine were 0.94% and 85.43% respectively. Production rate and purity of tea polyphenols were 12.35% and 95.62% respectively. The content of caffeine in tea polyphenols was less than 0.7%. Production rate and purity of tea polysacchadides were 1.1% and 51% respectively.