Carboxymethylation of Cassia angustifolia seed gum: Synthesis and rheological study. (6th March 2015)

• Record Type: Journal Article
• Authors: Rajput, Gaurav; Pandey, I.P.; Joshi, Gyanesh
• Is Part Of: Carbohydrate polymers. Volume 117(2015)
• Page Start: 494
• Page End: 500
• Publication Date: 2015-03-06
• Subjects: Cassia angustifolia seed gum -- Carboxymethylation -- Degree of substitution -- Non-Newtonian Pseudoplastic behaviour; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2014.09.063
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Carboxymethyl Cassia Angustifolia seed gum (DS 0.474) was synthesized successfully. Rheological study showed non-Newtonian pseudoplastic behaviour. IR spectra confirmed the carboxymethylation of Cassia Angustifolia seed gum. Abstract: 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 °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.