Abstract
The variation and distribution of O-glycosidically linked sugar chains in κ-casein from bovine mature milk were analyzed by HPLC, fast atom bombardment mass spectrometry, and 13C nuclear magnetic resonance. A monosaccharide alditol (N-acetylgalactosaminitol) and four oligosaccharide alditols [a neutral disaccharide (galactosyl-β1-3N-acetylgalactosaminitol), two acidic trisaccharides (straight chain: N-acetylneuraminyl α2-3galactosyl-β1-3N-acetylgalactosaminitol and branch chain: galactosyl β1-3 (N-acetylneuraminyl α2-6)N-acetylgalactosaminitol), and an acidic tetrasaccharide (N-acetylneuraminyl α2-3galactosyl-β1-3(N-acetylgalactosaminyl α2-6)N-acetylgalactosaminitol] were identified as sugar chains linking on normal bovine κ-casein. The most dominant sugar chain was an acidic tetrasaccharide. The four oligosaccharide chains were identical to those already found, but N-acetylgalactosamine was a newly identified sugar chain linking on κ-casein. The distribution of monosaccharide, disaccharide, trisaccharide (straight), trisaccharide (branched), and tetrasaccharide chains were determined by HPLC to be .8, 6.3, 18.4, 18.5, and 56.0%, respectively (means of five κ-caseins).
Original language | English |
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Pages (from-to) | 1768-1774 |
Number of pages | 7 |
Journal | Journal of Dairy Science |
Volume | 75 |
Issue number | 7 |
DOIs | |
Publication status | Published - 1992 |
Keywords
- C nuclear magnetic resonance
- CGP
- CNMR
- FABMS
- Gal
- Gal-NAc
- GalNAc
- N-acetylgalactosamhe
- N-acetylgalactosaminitol
- N-acetylneuraminyl
- NANA
- carbon-13 nuclear magnetic resonance
- caseinoglycopeptide (κ-casein, f106–l69)
- fast atom bombardment mass spectrometry
- fast atom bombardment mass spectrometry
- galactosyl
- sugar chain distribution
- κ-casein
ASJC Scopus subject areas
- Food Science
- Animal Science and Zoology
- Genetics