Characterisation by SEC and High Field NMR of Limit-Dextrins from Enzymatically Degraded Cationic Starches
Résumé
Chemically modified starches are widely used derivatives in fields such as paper-making and textile industries. Based on the results of enzymatic degradation Kavitha and Bemiller [3] showed that a commercial hydroxy-The physicochemical macroscopic properties of these products are closely linked to their structural organisation propyl starch seemed to more modified in areas near to the branching zones. Commercial cationic at the molecular level. There is a wide range of possible modification pattern on macromolecules such as starches are synthesised either in solution or more likely by dry process, grafting ammonium groups amylopectins. Different reactions may lead to a variety of structures. In a earlier work we observed that high ether bonds [4]. In a recent work we describe an alternative synthetic route to cationic starches using Acetylated starches of the same DS, but synthesised via two different processes, had different structures as via a glycerol-water plasticised molten medium to achieve the reaction [5]. The products of the b-seen from their NMR spectra [1]. Woortman and Steeneken [2] reported that granular starch was methylated amylolytic degradation are separated by SEC and analysed by NMR Spectroscopy. The results of In a more block-wise manner whereas when reacted in solution it was modified in a random fashion. structural characterisation are presented. [1] B. Laignel, C. Bliard, G. Massiot and J.M. Nuzillard, Carbohyd. Res., 298 (1997) 251-260 [2] P.A.M Steeneken, A.
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