Vitamin A is added in the AD calcium salt in the form of ethyl ester, which is insoluble in water. AD钙盐中的维生素A是以其乙酸酯的形态加入,而后者不溶于水。
In foods of animal origin, the major form of vitamin A is an ester, primarily retinyl palmitate, which is converted to the retinol ( chemically an alcohol) in the small intestine. 在动物z来源的食品中,维生素A的主要存在形式是维生素A酯,最常见的是维生素A棕榈酸酯,它们在小肠内被转化成维生素A。