双糖
双糖（英语：Disaccharide，亦称为二糖）是由两个单糖分子经缩合反应去脱一个水分子而成个一种碳水化合物。双糖搭单糖一样可溶于水。常看到个双糖为蔗糖、乳糖、麦芽糖。蔗糖是由葡萄糖搭果糖组成，乳糖是由葡萄糖搭半乳糖组成，麦芽糖则是由两分子个葡萄糖所组成。
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