Synthesis and characterization of acryloyloxy guar gum

Guar gum is a galactomannan commonly used as a viscosity modifier in the food, pharmaceutical, and cosmetics industry. The aim of this study was to synthesize acryloyloxy guar gum via a Schotten-Bauman reaction in aqueous media. The reaction products were characterized using FTIR, C¹³-NMR, wide angl...

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Bibliographic Details
Published in:Journal of applied polymer science 2010-07, Vol.117 (1), p.148-154
Main Authors: Shenoy, Mohan A, D'Melo, Dawid John
Format: Article
Language:English
Subjects:
Applied sciences
biomaterials
Cosmetics
Diffraction
Esters
Exact sciences and technology
Guar gum
Heating
hydrophilic polymers
Hydroxyl groups
modification
Natural polymers
Physicochemistry of polymers
polysaccharides
Reproduction
Starch and polysaccharides
Thermal analysis
Viscosity
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Summary:Guar gum is a galactomannan commonly used as a viscosity modifier in the food, pharmaceutical, and cosmetics industry. The aim of this study was to synthesize acryloyloxy guar gum via a Schotten-Bauman reaction in aqueous media. The reaction products were characterized using FTIR, C¹³-NMR, wide angle X-ray diffraction techniques to ascertain the effect of acrylation on the structure of guar gum. The acrylation of guar gum was found to be limited to the primary hydroxyl groups on the guar gum molecule. The maximum degree of substitution (DS) was found to be 0.56, which was observed after 3 h of reaction. Since the reaction was carried out in an aqueous medium after 3 h of reaction the DS of the derivatised guar gum was found to decrease, because of hydrolysis of the formed ester linkages. The ester content and intrinsic viscosity of the derivatised guar gums were also evaluated. Thermal analysis showed that a higher DS resulted in products with lower thermal stability and there was no evidence of reaction via the acrylate groups on heating.
ISSN:0021-8995
1097-4628
1097-4628
DOI:10.1002/app.31872