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Acacia Gum. A hydrocolloid (q.v.) material, also known as gum arabic, that is obtained from the exudate of the tropical acacia tree, Acacia senegal. The gum (q.v.) is made up mainly of the sugars galactose (q.v), arabinose (q.v.), and rhamnose (q.v.), and of various salts of glucuronic acid (q.v.). It is highly water soluble and finds use principally as a stabilizer (q.v.) in flat icings (q.v.) and sugar glazes (q.v.) to which it imparts a smooth and glossy surface character and in which it acts to control the rate of sugar crystallization (q.v.).