Abstract
Treatment of bovine and ovine submaxillary mucins with alkaline sodium borohydride converted all of the carbohydrate side-chains into dialyzable fragments. However, 10% and 22% of the hexosamine of native ovine submaxillary mucin (OSM) and bovine submaxillary mucin (BSM), respectively, was not reduced to aminodeoxy-hexitol by alkaline sodium borohydride after 120 h. Most of the hexosamine that was resistant to alkaline borohydride was present in newly described oligosaccharides. The β-elimination of the carbohydrate side-chains from the serine and threonine residues of the protein core was shown to be 95% quantitative when applied to BSM and OSM.
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