Valuable components concentration of raspberry marc extract by membrane filtration

Zsuzsanna Molnár, Kübra Özdemir, Erika Békássy-Molnár, Gyula Vatai

Research output: Contribution to conferencePaper

Abstract

The raspberry is rich in valuable components like polyphenols, antioxidants, anthocyanins linked to potential health protection against several human diseases. After the pressing, the valuable components can be extracted and then concentrated from the fruit marc. In the solvent extraction processes the usual way of the solvent regeneration is evaporation or distillation. These operations are energy consuming. Membrane separation processes are energetically more efficient, and carrying out at lower temperature the loss of valuable components is low. In this study microfiltration - MF, nanofiltration - NF and reverse osmosis - RO were used for concentration and separation the solvent from solutions prepared by extraction of raspberry marc with ethanol-water solution (in different ratios). Extraction was performed by a conventional method for 2 h at constant temperature. Extracted solutions were collected. For clarification, laboratory scale microfiltration equipment (with ceramic membranes) was used to remove suspended solids from the extract. After the filtration the clarified permeate was concentrated by RO with flat sheet membranes to concentrate the polyphenols and anthocyanins. The total soluble solid content and the density were measured, the total polyphenols and flavonoid compounds and the total anthocyanin content of samples were determined after the filtrations. The results of analysis proved that separated solvent did not contain valuable components and solids, therefore can be reused in extraction process. Combination of membrane filtration processes was appropriate for concentration of the valuable compounds from extracted solutions without losses of compounds. The removal of the solvent by membrane filtration is energetically more efficient than by evaporation.

Original languageEnglish
Publication statusPublished - Dec 1 2011
Event6th International CIGR Technical Symposium - Towards a Sustainable Food Chain: Food Process, Bioprocessing and Food Quality Management - Nantes, France
Duration: Apr 18 2011Apr 20 2011

Other

Other6th International CIGR Technical Symposium - Towards a Sustainable Food Chain: Food Process, Bioprocessing and Food Quality Management
CountryFrance
CityNantes
Period4/18/114/20/11

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Keywords

  • Membrane filtration
  • Raspberry
  • Solvent recovery

ASJC Scopus subject areas

  • Food Science

Cite this

Molnár, Z., Özdemir, K., Békássy-Molnár, E., & Vatai, G. (2011). Valuable components concentration of raspberry marc extract by membrane filtration. Paper presented at 6th International CIGR Technical Symposium - Towards a Sustainable Food Chain: Food Process, Bioprocessing and Food Quality Management, Nantes, France.