A new hexasaccharide chain isolated from bovine colostrum κ-casein taken at the time of parturition |
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| Authors: | Tadao Saito Takatoshi Itoh Susumu Adachi Tateo Suzuki Taichi Usui |
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| Institution: | 1. Department of Animal Science, College of Agriculture, Tohoku University, Tsutsumidori Amamiya-machi 1-1, Sendai 980, Japan;2. Department of Food Chemistry, College of Agriculture, Tohoku University, Tsutsumidori Amamiya-machi 1-1, Sendai 980, Japan;3. Department of Agricultural Chemistry, College of Agriculture, Shizuoka University, Ohya 836, Shizuoka 422 Japan |
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| Abstract: | The carbohydrate units linked to caseinoglycopeptide from colostrum taken 30 min after parturition were released as reduced oligosaccharides by alkaline borohydride treatment, and separated into four acidic oligosacchariditols (a hexa- (11.0%), penta- (38.5%), tetra- (35.5%) and a trisacchariditol (15.0%)). Structural studies showed that the hexasacchariditol was a new structure and had the chemical structure: NeuNAc-α-2-3-Gal-β-1-3-NeuNAc-α-2-3-Gal-β-1-4-GlcNAc-β-1-6-]-N-acetylgalactosaminitol(GalNAcItol). The other three oligosacchariditols were shown to be NeuNAc-α-2-3-Gal-β-1-3-Gal-β-1-4-GlcNac- β-1-6-]-GalNAcItol, NeuNAc-α-2-3-Gal-β-1-3-NeuNAc-α-2-6-]-GalNAcItol and NeuNAc-α-2-3-Gal-β-1-3- GalNAcItol, which were identical with those found previously in colostrum κ-casein taken 6 h after parturition. |
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| Keywords: | κ-Casein Hexasacchariditol Parturition Carbohydrate sequence (Bovine colostrum) |
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