High resolution 13C-N.M.R. spectroscopy of legume-seed galactomannans |
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| Affiliation: | 1. Food for Health Science Centre, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden;2. Department of Food Technology, Engineering and Nutrition, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden;1. Glyn O. Phillips Hydrocolloid Research Centre, School of Food and Pharmaceutical Engineering, Faculty of Light Industry, Hubei University of Technology, Wuhan 430068, China;2. Hubei Collaborative Innovation Centre for Industrial Fermentation, Hubei University of Technology, Wuhan 430068, China;3. Texture Design Laboratory, San-Ei Gen F.F.I. Inc., 1-1-11, Sanwa-cho, Toyonaka, Osaka 561-8588, Japan;4. Norwegian Biopolymer Laboratory, Department of Biotechnology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway;1. Department of Life Sciences, University of Trieste, Via Licio Giorgieri 5, I-34127 Trieste, Italy;2. Department of Chemical and Pharmaceutical Sciences, University of Trieste, Via Licio Giorgieri 1, I-34127 Trieste, Italy |
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| Abstract: | Five galactomannans obtained by aqueous extraction at different temperatures from the endosperm of the seed of Gleditsia triacanthos, and having different Gal:Man ratios, were submitted to a preliminary degradation, and the products analyzed by high resolution 13C-n.m.r. spectroscopy. In these spectra all carbon atoms yield several lines. C-6 (substituted Man) shows, for the first time, a clear splitting, which is explained by considering that this carbon atom is sensitive to whether or not its neighbors are branched; this provides a basis for determining the next-nearest-neighbor probabilities in the galactomannans (“triad frequencies”). Although diad frequencies are roughly consistent with a random arrangement, the values obtained for the triad frequencies indicate a more complex kind of arrangement of the lateral chains. |
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