鸡卵黄膜对葡萄糖的通透性、蛋白与蛋黄之间的碳水化合物梯度

Permeability of chicken egg vitelline membrane to glucose, carbohydrate gradients between albumen and yolk.

García F J, Pons A, Alemany M, Palou A

Comp Biochem Physiol B. 1983;75(1):137-40. doi: 10.1016/0305-0491(83)90051-2.

Abstract

In the fertile chicken egg the albumen had higher carbohydrate concentration than the yolk with the highest concentration in the vicinity of the vitelline and shell membranes. 2. The mean half-life of glucose in the albumen was 18 hr during the first day of incubation. 3. Vitelline membrane was found to be freely permeable to glucose both from albumen to yolk and from yolk to albumen. 4. The amount of carbohydrate strongly linked to protein (glycoprotein) is similar in yolk and albumen. 5. There is an in vivo as well as in vitro fixation of free glucose by the albumen proteins. 6. Most carbohydrate of the fertile chicken egg was found to be loosely-linked to protein.

摘要

在可孵化的鸡蛋中，蛋白中的碳水化合物浓度高于蛋黄，在卵黄膜和蛋壳膜附近浓度最高。2. 在孵化第一天，蛋白中葡萄糖的平均半衰期为18小时。3. 发现卵黄膜对葡萄糖可自由通透，无论是从蛋白到蛋黄还是从蛋黄到蛋白。4. 与蛋白质紧密相连的碳水化合物（糖蛋白）在蛋黄和蛋白中的含量相似。5. 蛋白中的蛋白质在体内和体外都会固定游离葡萄糖。6. 发现可孵化鸡蛋中的大多数碳水化合物与蛋白质的连接较为松散。