, chemical reaction, UV-VIS, IR spectrum.The results indicated that the red pigment of natural red yolk isCarotenoids, and had conjugated keto, no hydroxyl.

• 结果表明天然红心鸭蛋中红色色素为类胡萝卜素,该红色类胡萝卜素不含羟基,具有与类胡萝卜素双键呈共轭状态的羰基。