title: Carboxymethylation of Cassia angustifolia seed gum: synthesis and rheological study.
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.
authors.affiliation: Department of Chemistry, D.A.V. (PG) College, Dehradun, Uttarakhand, India. Electronic address: gaurav_rajput@outlook.com.
authors.forename: Gaurav
authors.initials: G
authors.lastname: Rajput
authors.affiliation: Department of Chemistry, D.A.V. (PG) College, Dehradun, Uttarakhand, India.
authors.forename: I P
authors.initials: IP
authors.lastname: Pandey
authors.affiliation: Cellulose and Paper Division, Forest Research Institute, Dehradun, Uttarakhand, India.
authors.forename: Gyanesh
authors.initials: G
authors.lastname: Joshi
keywords: Carboxymethylation; Cassia angustifolia seed gum; Degree of substitution; Non-Newtonian Pseudoplastic behaviour