A simple non-aqueous method for carboxymethylation of galactomannans

Parvathy, K. S. and Susheelamma, N. S. and Tharanathan, R. N. and Gaonkar, Anil Kumar (2005) A simple non-aqueous method for carboxymethylation of galactomannans. Carbohydrate Polymers, 62. pp. 137-141.

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Abstract

<p align="justify">A simple non-aqueous method for the preparation of carboxymethyl (CM) derivatives of galactomannans and other biopolymers has been developed. Galactomannans such as guar, tara and locust bean gums were subjected to carboxymethylation using monochloroacetic acid under the catalytic influence of NaHCO3 in dry state. The ratios of reagent and catalyst as well as the temperature and duration of the reaction were varied to prepare CM derivatives of different DS values ranging from 0.065 to 0.675. The progress of the reaction was followed by FT-IR and 13C NMR spectral data. The reaction carried out in the presence of a small amount (less than 0.01%) of EaOH (just to surface wet the gum powder) gave CM derivatives having relatively a higher viscosity (3500 cps) than the unmodified gum. Being a mild alkali, removal of NaHCO3 was easier, and the possibility of alkaline degradation caused by strong NaOH and also the effect of elevated temperature could be minimized. Overall the described method adds to the cost effectiveness as well as eco-friendly characteristic of the reaction.</p>

Item Type:	Article
Uncontrolled Keywords:	Guar gum; Tara gum; Galactomannans; Carboxymethylation
Subjects:	600 Technology > 08 Food technology > 22 Legumes-Pulses 500 Natural Sciences and Mathematics > 04 Chemistry and Allied Sciences > 28 Polysaccharide Chemistry
Divisions:	Dept. of Biochemistry
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	13 Jan 2006
Last Modified:	05 Oct 2018 06:15
URI:	http://ir.cftri.res.in/id/eprint/292

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