期刊
CARBOHYDRATE POLYMERS
卷 117, 期 -, 页码 494-500出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2014.09.063
关键词
Cassia angustifolia seed gum; Carboxymethylation; Degree of substitution; Non-Newtonian Pseudoplastic behaviour
The seeds of Cassia angustifolia are a rich source of galactomannan gum. The seed gums possess a wide variety of industrial applications. To utilize C. angustifolia seed gum for broader industrial applications, the carboxymethyl-Cassia angustifolia seed gum (CM-CAG) was synthesized. The gum was etherified with sodium monochloroacetate (SMCA) in a methanol-water system in presence of alkali (NaOH) at different reaction conditions. The variables studied includes alkali concentration, SMCA concentration, methanol:water ratio, liquor:gum ratio, reaction temperature and time. The extent of carboxymethylation was determined as degree of substitution (DS). The optimum conditions for preparing CM-CAG (DS = 0.474) comprised 0.100 mol of NaOH, 0.05 mol of SMCA, 80% of methanol:water ratio (as %methanol) and liquor:gum ratio (v/w) of 10:1 at 75 degrees C for 60 min using 0.03 mol (as AGU) of CAG. Rheological studies showed CM-CAG to exhibit non-Newtonian pseudoplastic behaviour, relatively high viscosity, cold water solubility and solution stability. (C) 2014 Elsevier Ltd. All rights reserved.
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