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Recovery of gallic acid with colloidal gas aphrons (CGA)

Spigno, G. and Jauregi, P. (2005) Recovery of gallic acid with colloidal gas aphrons (CGA). International Journal of Food Engineering, 1 (4). p. 5. ISSN 1556-3758

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To link to this item DOI: 10.2202/1556-3758.1038


In the present paper the potential application of colloidal gas aphrons (CGA) to the recovery of antioxidants from wine-making waste extracts is investigated. CGA were generated by stirring a buffered solution (400 ml) of a cationic surfactant(cetyltrimethylammonium bromide, CTAB) at 8000 rpm for 10 minutes. Trials were carried out on standard solutions (2 ml) of gallic acid (GA) 200 mg/l with varying volumes of colloidal gas aphrons (20-60 ml) generated with varying concentrations of CTAB (2 and 4 mM). Influence of pH, solvent (buffered aqueous solution and ethanol), CTAB to GA molar ratio on recovery were studied. Best recovery (63%) was achieved from an aqueous solution of GA and at a CTAB to GA molar ratio of 16. Separation is mainly driven by electrostatic interactions but pH conditions are to be optimised to preserve the GA antioxidant power.

Item Type:Article
Divisions:Life Sciences > School of Chemistry, Food and Pharmacy > Department of Food and Nutritional Sciences
ID Code:12967
Uncontrolled Keywords:Recovery, antioxidants, colloidal gas aphrons, gallic acid, wine-making waste

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