Fractionation of a red grape marc extract by colloidal gas aphrons

Farid Dahmoune, Khodir Madani, Paula Jauregi, Dante Marco De Faveri, Giorgia Spigno

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)


The objective of the current study was to investigate the application of colloidal gas aphrons (CGA) as a potential low-cost technology for the fractionation of phenolic extracts obtained from off-skins fermented red grape skins with high sugar content. The trials were aimed to investigate the possibility of using CGA generated from the non-ionic surfactant Tween20 to separate phenolic compounds from non-phenolic compounds (minerals and sugars) and to fractionate different fractions of phenolic compounds (total phenols, cinnamic acids and anthocyanins). Separation tests were carried out in a 0.7 L flotation column investigating the effect of both the volumetric ratio CGA/extract sample and the molar ratio CGA/extract sample on both the recovery yields and the separation factor (the ratio between the concentration of a compound in the recovered aphron phase and in the discharged liquid phase). Results revealed the possibility of reaching high recovery yield even though with a poor selective fractionation of the different compounds present in the extract, with glucose and cinnamic acids showing the highest affinity for the aphron phase.
Original languageEnglish
Title of host publicationChemical Engineering Transactions
Number of pages6
Publication statusPublished - 2013
EventICheaP-11, 11th International Conference on Chemical and Process Engineering - Milano
Duration: 3 Jun 20135 Jun 2013

Publication series



ConferenceICheaP-11, 11th International Conference on Chemical and Process Engineering


  • Colloidal gas aphrons
  • Flotation columns
  • Low-cost technology
  • Phenolic compounds
  • Phenolic extracts
  • Recovery yield
  • Separation factors
  • Volumetric ratio


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