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Colloidal gas aphrons based separation process for the purification and fractionation of natural phenolic extracts

Spigno, G., Amendola, D., Dahmoune, F. and Jauregi, P. (2015) Colloidal gas aphrons based separation process for the purification and fractionation of natural phenolic extracts. Food and Bioproducts Processing, 94. pp. 434-442. ISSN 0960-3085

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To link to this item DOI: 10.1016/j.fbp.2014.06.002


Following previous studies, the aim of this work is to further investigate the application of colloidal gas aphrons (CGA) to the recovery of polyphenols from a grape marc ethanolic extract with particular focus on exploring the use of a non-ionic food grade surfactant (Tween 20) as an alternative to the more toxic cationic surfactant CTAB. Different batch separation trials in a flotation column were carried out to evaluate the influence of surfactant type and concentration and processing parameters (such as pH, drainage time, CGA/extract volumetric and molar ratio) on the recovery of total and specific phenolic compounds. The possibility of achieving selective separation and concentration of different classes of phenolic compounds and non-phenolic compounds was also assessed, together with the influence of the process on the antioxidant capacity of the recovered compounds. The process led to good recovery, limited loss of antioxidant capacity, but low selectivity under the tested conditions. Results showed the possibility of using Tween 20 with a separation mechanism mainly driven by hydrophobic interactions. Volumetric ratio rather than the molar ratio was the key operating parameter in the recovery of polyphenols by CGA.

Item Type:Article
Divisions:Life Sciences > School of Chemistry, Food and Pharmacy > Department of Food and Nutritional Sciences > Food Research Group
ID Code:56330
Uncontrolled Keywords:Antioxidants; Colloidal gas aphrons; Grape marc; Phenolics; Surfactants

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