Carboxymethylation of Cassia tora gum

Abstract

The preparation of carboxymethyl (CM)-Cassia tora gum (CTG) with monochloroacetic acid and sodium hydroxide was investigated under different reaction conditions. The carboxymethylation reaction was studied with respect to the degree of substitution of CM-CTG. The variables studied were the concentration of reactants, methanol-water ratio (solvent), reaction time, and reaction temperature. Carboxymethylation of CTG increased its solubil-ity in cold water and the stability of its paste to microorganisms. Regardless of the degree of substitution of these products, their aqueous solutions were characterized by non-Newtonian pseudoplastic behavior. Determination of the rheological properties of CM-CTGThe rheological properties were determined with a Brookfield digital viscometer (model RVTD, Stough-Correspondence to: V. Kumar (vineetkmadan@yahoo.co.in) or P. L. Soni (sonipl@icfre.org).

Development of novel thiolated carboxymethyl-gellan gum as potential mucoadhesive polymer: Application of DoE

“…However, a further increase in concentration of MCA beyond 2g using the optimum dose of NaOH concentration favors the glycolate formation and the reaction efficiency decreases. Similar observations are reported for Cassia tora gum, starch, Leucaena glauca seed gum and Cassia occidentalis seed gum [51][52][53].…”

Synthesis and characterization of carboxymethylated red angico (Anadenanthera macrocarpa) exudate polysaccharide

“…The maximal DS (0.63) and MCA total efficiency (0.57), as well as the yield (91.0%) were obtained at 708C. Similar behavior was observed for granular potato starch in the range of 30-508C, 6 Cassia tora gum from 308C to reflux temperature, 14 corn starch in the range of 30-558C and amaranth starch from 45 to 658C. 8 …”

“…4,6,8,[13][14][15][16] The most efficient reactions were obtained at different temperature, depending on the polysaccharide, and varied from 30 to 958C. In general, solvents are alcohols/water mixtures.…”

“…Reaction parameters (temperature, solvent, reaction time, and reagent concentration) and their effect on the degree of substitution (DS) and yield have been recently investigated for many polysaccharides, such as starch, [5][6][7][8][9] cellulose, [10][11][12] inulin, 4 cashew gum (CG), 13 Cassia tora gum, 14 Cassia occidentalis gum, 15 and Konjac gum. 16 The aim of this work was to study the reaction parameter on the synthesis of carboxymethylated A macrocarpa polysaccharide (CMAG) with different degrees of substitution.…”

Synthesis of Carboxymethyl Flaxseed Gum and Study of Nonlinear Rheological Properties of Its Solutions

“…However, FG has undesirable characteristics such as low solubility in cold water and dull color of its solution [3] Modification of characteristics of natural gums using chemical methods has been employed to improve their properties such as solubility in cold water [4] and stability of gum against microbial degradation [5]. Among various chemical modification methods, carboxymethylation is widely used because of its ease of processing, lower cost, versatility and non-toxicity of the products [6].…”