Distribution of N-acetylneuraminic acid and sialylglycan in eggs of the Silky fowl

M. Koketsu, E. Sakuragawa, R. J. Linhardt, H. Ishihara

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Abstract

1. The distribution of sialic acid in the eggs of original Silky fowl was investigated. The sialic acid contents of the yolk, albumen and the chalaza of a single egg were 205.2, 11.96 and 0.83 mg, respectively. 2. The sialic acid content of the yolk of Silky eggs was 11.5-fold higher than that of a conventional domestic fowl yolk. 3. Sialic acid isolated from Silky yolk was entirely N-acetylneuraminic acid (NeuAc). No N-glycolylneuraminic acid or O-acetyl containing sialic acid was observed. 4. The structure of the major sialylglycan in Silky egg yolk was determined to be a disialyl-biantennary chain in which the NeuAc residues were α2-6 linked to glucose. No α2-3 linkage was observed. 5. Thus, the Silky fowl's egg provides an excellent source of NeuAc and sialylglycan.

Original languageEnglish
Pages (from-to)145-148
Number of pages4
JournalBritish Poultry Science
Volume44
Issue number1
DOIs
StatePublished - Mar 2003

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