Abstract
1. 1. The density of mucus glycoprotein compared to that of the corpus, antrum and duodenum was; 1.52, 1.49 and 1.57 g/ml respectively. 2. 2. Carbohydrate composition of gastrointestinal mucus glycoprotein consisted of N- acetylgalactosamine , N- acetylglucosamine , galactose, fucose and sialic acid. Ratios of carbohydrate composition among corpus, antral and duodenal mucus glycoproteins differed. 3. 3. The average length of an oligosaccharide was found to be about 12–13, 14 and 10 sugars in the corpus, antrum and duodenum, respectively. 4. 4. In the corpus, the amino acid content was found to have the following quantitative order: Thr > Ser > Glx = Pro ; in the antrum: Thr > Ser > Glx; and in the duodenum: Thr > Ser > Pro. 5. 5. Corpus, antral and duodenal mucus glycoproteins have the blood-group A antigen; antral mucus glycoprotein in particular exhibited strong blood-group A activity.
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