NMR-STUDIES OF SYNERGISTIC KAPPA-CARRAGEENAN CAROB GALACTOMANNAN GELS

13C-n.m.r. spectroscopy has been used to investigate the carob galactomannan-kappa carrageenan binary gels. Starting from partially depolymerized carob samples, evidence for interaction and intermolecular binding was found by analysis of the spectra obtained in quantitative conditions and in the absolute intensity mode. From these, a reconstitution of the signals corresponding to C-1, C-4, C-5 and C-6 showed the existence of three kinds of galactomannan chains: the first ones with a low galactose content were strongly connected and as much had completely lost their mobility; but the chains with a high galactose content were still detected and could be divided in two groups according to their mobility. © 1990.