title: Characterization of two molecular species GD3 ganglioside from bovine buttermilk.
abstract: Two gangliosides, representing 85% of total lipid-bound sialic acid, have been isolated from bovine buttermilk and characterized. Both contained long-chain base, glucose, galactose and sialic acid in the molar ratio 1:1:1:2, and gave, upon sialidase treatment, a neutral glycolipid, characterized as lactosylceramide. Partial acid hydrolysis, permethylation analysis and chromium trioxide oxidation indicated their basic oligosaccharide portion to be NeuAc alpha 2----8NeuAc alpha 2----3Gal beta 1----4Glc. The difference between the two forms was exclusively in the ceramide moiety of the molecule, one containing mainly long-chain (C22-C25) fatty acids and an equimolar proportion of C16 and C18 long-chain bases, and the other mainly palmitic acid and C18 long-chain base.
mesh_terms: D000818:Animals; D002241:Carbohydrates / Q000032:analysis; D002417:Cattle; D002855:Chromatography, Thin Layer; D005227:Fatty Acids / Q000032:analysis; D005260:Female; D005732:Gangliosides / Q000032:analysis*; D008892:Milk / Q000032:analysis*; D009439:Neuraminidase / Q000378:metabolism
chemical_list: D002241:Carbohydrates; D005227:Fatty Acids; D005732:Gangliosides; C026226:ganglioside, GD3; D009439:Neuraminidase