大家买菜时,常听到一些口口相传的“买菜指南”。就拿鸡蛋来说,像土鸡蛋,蛋壳越厚越好,蛋黄越大越黄越好。但是,鸡蛋黄到底是不是越黄越好呢?世界上那么多颜色,为什么鸡蛋黄偏偏是黄色?这主要得怪类胡萝卜素,比如最常见的叶黄素。叶黄素是植物成分,鸡自身无法合成,只能从饲料或饮水中获取。在鸡生蛋之前,黄色物质主要沉积在嘴、鸡爪、皮和脂肪。当鸡开始生蛋的时候,黄色物质逐步向卵巢转移。蛋黄的成分是从 We buy food, often heard some word of mouth “grocery shopping guide ”. Take eggs, eggs, such as soil, the thicker the eggshell as possible, the larger the yellowing, the better the yellow. However, the egg yolk in the end is not the more yellow the better? The world so many colors, why the egg yolk is yellow? This is the main strange carotenoids, such as the most common lutein. Lutein is a plant component, the chicken itself can not be synthesized, only from feed or drinking water. Before the chicken was born, the yellow material was mainly deposited on the mouth, chicken feet, skin and fat. When the chicken starts to lay eggs, the yellow substance gradually transfers to the ovary. The composition of the egg yolk is from