Differences in oligosaccharide pattern of a sample of polar bear colostrum and mid-lactation milk |
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Authors: | Urashima Tadasu Nagata Hiromi Nakamura Tadashi Arai Ikichi Saito Tadao Imazu Koji Hayashi Teruaki Derocher Andrew E Wiig Oystein |
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Institution: | Department of Animal Science, Obihiro University of Agriculture and Veterinary Medicine, Inada cho, Hokkaido, Obihiro 080-8555, Japan. urashima@obihiro.ac.jp |
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Abstract: | Although the concentrations of carbohydrate in the colostrum and in the mid-lactation milk of polar bear (Ursus maritimus) were similar, the oligosaccharide patterns differed. The colostrum sample contained Neu5Ac(α2-3)Gal(β1-4)Glc (3′-N-acetylneuraminyllactose), GalNAc(α1-3)Fuc(α1-2)]Gal(β1-4)Glc (A-tetrasaccharide), Fuc(α1-2)Gal(β1-4)Glc (2′-fucosyllactose) and Gal(β1-4)Glc (lactose). The mid-lactation milk contained Gal(α1-3)Fuc(α1-2)]Gal(β1-4)Fuc(α1-3)]Glc (B-pentasaccharide), GalNAc(α1-3)Fuc(α1-2)]Gal(β1-4)Fuc(α1-3)]Glc (A-pentasaccharide), Gal(α1-3)Fuc(α1-2)]Gal(β1-4)Glc (B-tetrasaccharide), A-tetrasaccharide, Gal(α1-3)Gal(β1-4)Fuc(α1-3)]Glc (3-fucosylisoglobotriose), Gal(α1-3)Gal(β1-4)Glc (isoglobotriose) and lactose. The dominant saccharides in the colostrum were 3′-N-Acetylneuraminyllactose and lactose, whereas isoglobotriose was the dominant saccharide in the mid-lactation milk in which lactose was only a minor component. Isoglobotriose, which had previously been found to be a dominant saccharide in mature milk from the Ezo brown bear, the Japanese black bear and the polar bear, was not found in the polar bear colostrum. |
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Keywords: | Ursus maritimus Polar bear Colostrum Milk oligosaccharides Isoglobotriose Milk composition Lactation |
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