Effect of dietary fiber of vegetables on calcium and vitamin B1 absorption

1)从生、煮、炸胡萝卜、菠菜、食用胡萝卜根和甜椒中分离出膳食纤维。在pH值为5.4时，膳食纤维对钙、钠的吸附大于在pH值为8.0时的吸附。2)电子显微镜观察发现，生胡萝卜的膳食纤维形成较圆，而油炸胡萝卜的膳食纤维则有扩大的趋势。3)对于维生素BI总量饱和的女性，早餐时分别给予80g煮胡萝卜根、10g干胡萝卜粉、80g硫胺素来源猪肉或单独80g猪肉。80g食用胡萝卜根可减少早餐后5小时尿维生素B1的排泄，10g干胡萝卜粉可增加尿中维生素B1的排泄量。这些结果表明，食用胡萝卜根可能会抑制维生素BI的吸收，而干胡萝卜粉可能会促进维生素BI的吸收。4)有报道称，肾源性环状AMP(NCA)能够监测钙的吸收，因为膳食中吸收的钙与甲状腺激素呈负相关。因此，在早餐时服用10g干胡萝卜粉的妇女的NCA是测定的，但服用干胡萝卜粉不会改变NCA。

1) Dietary fibers were separated from raw, boiled and fried carrot, spinach, the root of edible hurdock and sweet pepper. Ca and Na adsorption of the dietary fibers were more at pH 5.4 than at PH 8.0. Ca adsorption of the dietary fibers at pH 5.4 was mostly increased by cooking, but that at pH 8.0 was mostly increased ; by cooking.2) It was shown by electron micrograph that the dietary fiber of raw carrot formed on rather round, but that of fried carrot trended to extend.3) Eighty g the root of edible hurdock boiled or ten g dried carrot powder and 80 g pork for thiamin source or 80 g pork alone were administered with breakfast to the women whose total body pool of vitamin BI was saturated. Eighty g the root of edible hurdock decrease the urinary excretion of vitamin Bl for five hours after breakfast, ten g dried carrot powder increased it. These results suggest that the root of edible hurdock may inhibit vitamin BI absorption, whereas dried carrot powder may stimulate it.4) It was reported that nephrongenous cyclic AMP(NCA) was able to monitor Ca absorption, since there is an inverse relation between absorbed dietary Ca and para thyroid hormone. Therefore NcA was measured in women who took ten g dried carrot powder with breakfast, but NcA was not change by taking dried carrot powder.