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糖是α-碳原子上带有羟基的多羟基醛或多羟基酮,或能水解生成这样化合物的物质。一般可分为四类:单糖,二糖,寡聚糖(一般含3个以上的单糖)和多糖(含10个以上的单糖)。糖分子中一般都含有几个不对称碳原子,所以大多具有旋光性。
Sugar is a polyhydroxy aldehyde or polyhydroxy ketone having a hydroxyl group on the? -carbon atom, or a substance that can be hydrolyzed to produce such a compound. Generally can be divided into four categories: monosaccharides, disaccharides, oligosaccharides (usually containing more than 3 monosaccharides) and polysaccharides (containing more than 10 monosaccharides). Sugar molecules generally contain several asymmetric carbon atoms, so most of the optical activity.