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

日本绿色茶的许多粉末产品（用于饮用和食用）已作为一种健康食品上市。然而，直接食用粉末茶叶会增加氟（F）的摄入量，并且茶叶中的酸性F可能会通过消化器官中的胃液和肠液释放出离子F。因此，研究茶叶粉经人工胃、肠溶液处理后释放F离子的比例，并估算其吸收量的增加是非常重要的。并对日本市售罐装茶饮料中的氟含量进行了测定。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。茶叶中氟的最大释放量为非离子型氟的40%左右， ...更多信息 在室温和37 ℃下，在室温和37 ℃下，食用茶叶的F释放曲线不同。与饮用茶叶相比，在室温下，离子F从非离子F中释放缓慢。在37 ℃的情况下，离子F的释放速度比室温的情况快。这些观察结果表明，从粉末茶叶中释放出相当数量的离子F，并且F的释放模式根据不同的制造工艺而不同.以人工肠液为例，观察到不同产品的离子氟释放曲线不同。在室温和37 ℃下，1号可食茶叶的最大释氟率分别为非离子型氟的12%和25%。在室温和37 ℃下，2号食用茶的情况下释放的离子F低于1号的情况。在37 ℃时，食用茶中氟的最大释放量约为非离子型氟的40%，而在室温下，离子型氟的释放量低于37 ℃时的释放量.在日本的罐装茶饮料中发现了一个案例，其中含有高浓度的氟离子。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