Like cellobiose and maltose, lactose is a reducing sugar. It exhibits muta - rotation and is a 1,4'-beta-linked glycoside. Unlike cellobiose and maltose, however, lactose contains two dif~erent monosaccharide units. Acidic hydrolysis of lactose yields 1 equiv of D-glucose and 1 equiv of D-galactose; the two are joined by a beta-glycoside bond between C1 of galactose and C4 of glucose.
Lactose, a 1,4'-beta-glycoside
[4-0 -(beta-D-Galactopyranosyl)-beta-D-glucopyranose]
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