Novel Acrylic-modified Acacia Gum Thickener: Preparation, Characterization and Rheological Properties

Acacia gum (Arabic gum; A-gum) is a branched complex heteropolysaccharide with extremely high solubility and extraordinary Newtonian behavior in solution at concentrations even higher than 25%. In this work, A-gum thickening properties were highly improved to form non-Newtonian fluids in water at co...

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Bibliographic Details
Published in:Die Stärke 2009-04, Vol.61 (3-4), p.188-198
Main Authors: Nickzare, Morteza, Zohuriaan-Mehr, Mohammad J, Yousefi, Ali A, Ershad-Langroudi, Amir
Format: Article
Language:English
Subjects:
Acrylonitrile
Arabic gum
Biological and medical sciences
Cereal and baking product industries
Food industries
Fundamental and applied biological sciences. Psychology
Graft copolymerization
Rheology
Thickener
Thickener, Rheology
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Summary:Acacia gum (Arabic gum; A-gum) is a branched complex heteropolysaccharide with extremely high solubility and extraordinary Newtonian behavior in solution at concentrations even higher than 25%. In this work, A-gum thickening properties were highly improved to form non-Newtonian fluids in water at concentrations below 2%. The thickener was prepared by graft copolymerization of acrylonitrile onto A-gum using ceric ammonium nitrate. The synthesized graft copolymers (differing in percentage and molecular weight of the grafted acrylic chains) were then alkaline-hydrolyzed under various conditions (i.e. temperature, time and the NaOH concentration) to prepare the thickening agents. FTIR and elemental analyses were used for elucidating the structure of samples. Steady-shear rheological properties of aqueous solutions of the thickener at variety of concentrations, temperatures and saline solutions were investigated in details.
ISSN:0038-9056
1521-379X
DOI:10.1002/star.200800066