Binding Property of Aluminium Ion to Dietary Fiber and Polyphenol Compounds

测定了铝离子与膳食纤维、多酚类化合物和有机酸的结合性能。用绿色茶、红茶、乌龙茶和速溶咖啡进行了铝离子被人体吸收的体外研究，测得每1g水溶性大豆膳食纤维中结合铝离子的量为21 mg。表没食子儿茶素没食子酸酯与1.6 mg铝结合。柠檬酸对铝离子的结合能力最强，每克柠檬酸可结合44毫克铝，绿色茶、红茶和速溶咖啡中的铝不以离子形式存在，但乌龙茶中的铝以离子形式存在，占总铝的10-26%。在人体胃液条件下，绿色茶和红茶中的铝不增加。速溶咖啡中约有50%的铝以离子形式存在，乌龙茶中铝的离子化率比前一实验提高了5-10%，说明铝可与可溶性膳食纤维或多酚类化合物形成络合物排出体外，对人体健康无不良影响。

Binding property of aluminium ion were measured to dietary fiber, polyphenol compounds and organic acids. In vitro studies on possibility of Aluminium absorption into human body were carried out using green tea, black tea, oolong tea and instant coffee.Amount of bound aluminium ion to 1 g of soluble soybean dietary fiber isolated by modified Prosky method were determined as 21 mg. Epigallocatechin gallate were bound to 1.6 mg of aluminium. Citric acid showed the highest aluminium ion binding ability and 1 g of citric acid being bound to 44 mg of aluminium.Aluminium in green tea and black tea infusions and instant coffee solution were not found as ion form, but Aluminium in oolong tea infusion was found as ion form in the range of 10-26% of total Aluminium. In the case of human gastric fluide condition, Aluminium in green tea and black tea did not ionize. About 50% of Aluminium in instant coffee was found in ion form and ionized ratio of oolong tea increased 5-10% compared with the former experiment.These results suggest that orally taken aluminium may be excreted as complex with soluble dietary fiber or polyphenol compounds and daily intake of teas may not give any adverse effect to human health.