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Effects of high hydrostatic pressure and chemical reduction on the emulsification properties of gum arabic

Ma, F., Bell, A. E., Davis, F. J. and Chai, Y. (2015) Effects of high hydrostatic pressure and chemical reduction on the emulsification properties of gum arabic. Food Chemistry, 173. pp. 567-576. ISSN 0308-8146

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To link to this item DOI: 10.1016/j.foodchem.2014.10.046

Abstract/Summary

Gum arabic is widely used in the food industry as an additive, both as a thickener and an emulsifier. This study has compared the emulsification properties of two types of gums, KLTA (Acacia senegal) and GCA (Acacia seyal), both in their native/untreated forms and after exposure to high pressure (800 MPa). Further studies were undertaken to chemically modify the disulphide linkages present and to investigate the effects of their reduction on the diffusion of the carbohydrate materials. The emulsification properties of the gum samples were examined by determining the droplet size distribution in a ‘‘model’’ oil-in-water system. Results showed that high pressure treatment and chemical reduction of gums changed the emulsification properties of both gums. The high molecular weight component in arabinogalactanproteins (AGP/GP), and more ‘‘branched’’ carbohydrates present in gum arabic, may be responsible for the emulsification properties of GCA gum, indicating that the emulsification mechanisms for KLTA and GCA were different.

Item Type:Article
Refereed:Yes
Divisions:Interdisciplinary centres and themes > Chemical Analysis Facility (CAF)
Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:38220
Uncontrolled Keywords:Gum arabic; Arabinogalactan protein (AGP); High pressure treatment; Reduction of carbohydrate side chain; Emulsification properties
Publisher:Elsevier

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