Some physical and chemical properties of gum exudates from acacia species of the series vulgares and gummiferae.

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Date
1998
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Publisher
University of Dar es Salaam
Abstract
This dissertation reports on the physicochemical properties of five Acacia gum samples from Tanzania and compares them with the specifications demanded by the regulatory bodies as well as Tanzanian commercial Acacia gum. Some properties (total ash, viscosity, optical density, specific rotation, tannin and methoxyl contents and acid equivalent weight) of the gum exudate from A. sieberana var woodii have been found to be similar to those of Tanzanian commercial gum arabic. However, the results suggest that the gum is only a minor source of the commercial product. The properties of the gum from the other Acacia species, i. e. A. stuhlmanii, A. pseudofistula and A. tanganyikensis are substantially different from those of the Tanzanian commercial product, and therefore do not contribute to Tanzanian commercial Acacia gum. In addition, some of the properties (moisture, total ash and nitrogen and lead contents) of the gum exudate from A. sieberana var woodii satisfy the specifications demanded by the regulatory bodies for gum arabic for food and pharmaceutical use. However, the gum has been found to contain tannin and its specific rotation outside the specified range. The properties of the gum exudates from A. sieberana var woodii and A. sieberana var sieberana are quite similar and it is justifiable to retain them as variants of the same species.
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Keywords
Gums and resins, Plant exudates
Citation
Kejo, J. Z. (1998). Some physical and chemical properties of gum exudates from acacia species of the series vulgares and gummiferae. Master dissertation, University of Dar es Salaam. Available at (http://41.86.178.3/internetserver3.1.2/search.aspx?formtype=advanced)