Hydrodynamic and rheological properties of Irvingia gabonensis gum

Nwokocha, Louis M and Williams, Peter A (2014) Hydrodynamic and rheological properties of Irvingia gabonensis gum. Carbohydrate Polymers, 114. pp. 352-356. ISSN 0144-8617

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Abstract

The polysaccharide component of Irvingia gabonensis endosperm was isolated and its hydrodynamic and rheological properties investigated. The polysaccharide is an arabinogalactan and contains small amounts of rhamnose, galacturonic acid, glucose and glucuronic acid. The polysaccharide displayed typical polyelectrolyte behaviour in solution. The intrinsic viscosity at infinite ionic strength, a measure of the hydrodynamic volume of the uncharged polysaccharide molecule, was obtained as 4.9 dl/g. The macromolecules have a semi flexible backbone with a Smidsrod stiffness parameter of 0.085. The polysaccharide exhibited non-Newtonian behaviour at all the concentrations (0.2% to 3.0% (w/v)) investigated. Cox-Merz plots showed that η( ) and η*(ω) were closely superimposable except at low shear rates and higher concentrations, where η* > η. The high Mw (1.56 x 106 g/mol) and its random coil conformation show Irvingia gabonensis polysaccharide has potential for application as thickener.

Item Type: Article
Keywords: Irvingia gabonensis polysaccharide, monosaccharide composition, molecular weight, rheological properties, stiffness parameter
Members: Glyndŵr University
Depositing User: Mr Stewart Milne
Date Deposited: 27 Feb 2015 13:49
Last Modified: 20 Mar 2016 21:31
URI: http://collections.crest.ac.uk/id/eprint/8266

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