Chemical Effects of A- and B-Decomposing Enzymes on Blood Group Substances from Red Cells

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Abstract
1. Sugars in red cells, stroma, and crude glycolipid of A, B, and O blood groups consisted of galactose, glucose, mannose, fucose, N-acetylgalactosamine, N-acetylglucosamine, and sialic acid. 2. When the blood group specific enzyme was applied to red cells or crude glycolipid derived from them, disaccharide, consisting of N-acetylgalactosamine and galactose, was mainly demonstrated besides such monosaccharides as N-acetylgalactosamine and galactose in the case of group A, and monosaccharide, galactose, in the case of group B. 3. From the amount of sugar liberated from red cells as the result of the enzyme action, molecule number of sugar as the end determinant of the blood group specificity per one red cell was calculated.

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