Fluoride release from powdered tea leaves treated with an artificial gastric and intestinal solutions.

日本绿茶的许多粉状产品（供饮用和食用）已经作为一种保健食品上市。然而，直接食用茶叶粉会增加氟化物(F)的摄入量，并且茶叶中的可酸化F有可能通过消化器官的胃液和肠液释放离子F。因此，研究释放离子F的比例和估计吸收F的增加是很重要的。本研究的目的是测定经人工胃液和人工肠液处理的茶叶粉末中离子F的释放水平。并测量了日本市场上罐装茶饮料中的氟化物含量。实验结果如下：1.实验结果表明：在人工胃液的情况下，在饮用和食用茶叶之间观察到不同的F释放曲线。饮用茶叶中F的最大释放率约为非离子型F的40%，高于室温和37℃的温度。食用茶叶在室温和37ºC温度下的F释放曲线不同。在室温下，离子F从非离子F中释放出来的速度比饮用时慢。在37℃的情况下，离子F的释放速度比室温下要快。这些观察结果表明，相当数量的离子F从茶叶粉末中释放出来，并且释放模式因不同的制造工艺而异。在人工肠液的情况下，观察到不同产品的氟离子释放曲线不同。在室温和37℃条件下，食用茶叶1号的最大释出率分别为非离子型F的12%和25%。食用茶2号在室温和37个氯<s:1> C4下释放的离子F比1号低。在37℃的温度下，可食用茶中F的最大释放率约为非离子型F的40%。然而，在室温下，离子F的释放量低于37 C.5。在日本的罐头茶饮料中发现了高浓度的氟离子。少

A lot of powdered products (for drinking and eating) of the Japanese green tea has been on the market as a kind of health food. However, direct eating of powdered tea leaves increases the fluoride (F) intake levels, and there is a possibility that the acidlaible F in the tea leaves release ionic F by gastric and intestinal juice in the digestive organ. Therefore, it is important to examine the ratio of the releasing ionic F and estimate the increase of F absorption.The objective of this research was to determine the level of the releasing ionic F from the powdered tea leaves treated by an artificial gastric and intestinal solutions. And the fluoride levels in the tinned tea drinks on the market in Japan were measured.The results were as follows :1. In the case of an artificial gastric solution, a different F releasing curve was observed between the drinking and the eating tea leaves. The maximum ratios of F releasing from the drinking tea leaves were about 40% of non-ionic F in them bo … More th at the room temperature and 37ﾟC.2. The eating tea leaves showed different F releasing curves between at room temperature and at 37ﾟC.In room temperature, ionic F was released slowly from non-ionic F compared to the case of drinking ones. In the case of 37ﾟC,ionic F was released faster than the cases of room temperature. These observations indicate that a considerable amount of ionic F is released from powdered tea leaves and the F-releasing patterns vary according to the different manufacturing processes.3. In the case of an artificial intestinal solution, the different ionic fluorine releasing curves were observed among the products. The maximum ratio of F releasing from the edible tea leaves No.1 was about 12 and 25% of non-ionic F in them at room temperature and 37ﾟC,respectively. The case of the edible tea No.2 released lower ionic F than the case of No.1 both at room temperature and 37ﾟC4. The maximum ratio of F releasing from the edible teas were about 40% of non-ionic F in them at 37ﾟC.In the room temperature, however, ionic F was released lower than the case of 37ﾟC.5. One case in the tinned tea drinks in Japan was found to have a high concentration of ionic fluorine. Less