Abstract
It has been shown that hemosiderin contains two sialic acids: N-acetylneuraminic acid and glycolylneuraminic acid. These acids are found in both of the iron-free derivatives of hemosiderin: the insoluble aposiderin and the soluble component. Both of these fractions contain the same ratio of sialic acid to hexoses, fucose, and hexosamine, respectively. This suggests that the character of the glycoprotein-like compounds in these fractions is similar. Wöhler's finding of deoxyribose and guanine in aposiderin could not be corroborated. The presence of iron interferes in the determination of sialic acid in hemosiderin.
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