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。用绿茶、红茶、乌龙茶和速溶咖啡对铝在人体吸收的可能性进行了体外研究。采用改良Prosky法分离的可溶性大豆膳食纤维，测定其与铝离子的结合量为21 mg。表没食子儿茶素没食子酸酯与1.6毫克铝结合。柠檬酸对铝离子的结合能力最强，1g柠檬酸可与44mg铝结合。在绿茶、红茶和速溶咖啡溶液中未发现铝以离子形式存在，而在乌龙茶中铝以离子形式存在，占总铝的10 ~ 26%。在人体胃液条件下，绿茶和红茶中的铝没有电离。速溶咖啡中约有50%的铝以离子形式存在，乌龙茶的电离率较前一次实验提高了5-10%。这些结果表明，口服铝可能与可溶性膳食纤维或多酚化合物复合物一起排出体外，每日摄入茶可能不会对人体健康产生任何不良影响。

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.