期刊
CARBOHYDRATE POLYMERS
卷 126, 期 -, 页码 70-77出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2015.02.053
关键词
Kappa-carrageenan; Iota-carrageenan; Cationization; Amphoteric polysaccharides; 3-Chloro-2-hydroxypropyltrimethylammonium chloride
资金
- National Research Council of Argentina [112-200801-00234/2009-2011, 112-200901-00531/2010-2012]
- University of Buenos Aires [20020100100479/2011-2014, 20020100100726/2011-2014]
Commercial kappa- and iota carrageenans were cationized with 3-chloro-2-hydroxypropyltrimethylammonium chloride in aqueous sodium hydroxide solution. For kappa-carrageenan three derivatives with different degrees of substitution were obtained. Native and amphoteric kappa-carrageenans were characterized by NMR and infrared spectroscopy, scanning electron and atomic force microscopy; methanolysis products were studied by electrospray ionization mass spectrometry. Young moduli and the strain at break of films, differential scanning calorimetry, rheological and flocculation behavior were also evaluated; the native and the amphoteric derivatives showed different and interesting properties. Cationization of iota-carrageenan was more difficult, indicating as it was previously observed for agarose, that substitution starts preferentially on the 2-position of 3,6-anhydrogalactose residues; in iota-carrageenan this latter unit is sulfated. (C) 2015 Elsevier Ltd. All rights reserved.
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