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

Paper ID Volume ID Publish Year Pages File Format Full-Text
18936 43037 2015 9 PDF Available
Title
Colloidal gas aphrons based separation process for the purification and fractionation of natural phenolic extracts
Abstract

•Application of colloidal gas aphron to the recovery of phenolics from a natural extract.•pH influence on process separation of natural phenolics using a cationic surfactant.•Tween 20 micelles and natural grape marc phenolics hydrophobic interactions are shown.•Potential selectivity in the separation of different phenolic compounds.

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.

Keywords
ABTS, 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt; AOC, antioxidant capacity expressed as absorbance percent inhibition in the ABTS assay; CAE, caffeic acid equivalents; CAPy/CLPy, concentration of compound y in the collapsed ap
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Colloidal gas aphrons based separation process for the purification and fractionation of natural phenolic extracts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 94, April 2015, Pages 434–442
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us