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Food Technology and Biotechnology, Vol. 55 No. 3, 2017.

Short communication, Note

https://doi.org/10.17113/ftb.55.03.17.5200

Extraction of Proanthocyanidins and Anthocyanins from Grape Skin by Using Ionic Liquids

Natka Ćurko ; University of Zagreb, Faculty of Food Technology and Biotechnology, Pierott ij eva 6, HR-10000 Zagreb, Croatia
Marina Tomašević ; University of Zagreb, Faculty of Food Technology and Biotechnology, Pierott ij eva 6, HR-10000 Zagreb, Croatia
Marina Cvjetko Bubalo orcid id orcid.org/0000-0001-9023-8482 ; University of Zagreb, Faculty of Food Technology and Biotechnology, Pierott ij eva 6, HR-10000 Zagreb, Croatia
Leo Gracin ; University of Zagreb, Faculty of Food Technology and Biotechnology, Pierott ij eva 6, HR-10000 Zagreb, Croatia
Ivana Radojčić Redovniković orcid id orcid.org/0000-0002-8491-1033 ; University of Zagreb, Faculty of Food Technology and Biotechnology, Pierott ij eva 6, HR-10000 Zagreb, Croatia
Karin Kovačević Ganić ; University of Zagreb, Faculty of Food Technology and Biotechnology, Pierott ij eva 6, HR-10000 Zagreb, Croatia

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Abstract

In this study, eight different types of imidazolium-based ionic liquids (ILs) were applied as new solvents in the extraction of flavonoids from grape skin, and compared to the conventional organic solvent extraction that was not reported earlier. The structure of anions, cations and concentration of ILs significantly affected extraction yields. The highest mass fractions of proanthocyanidins and anthocyanins were obtained with 2.5 mol/L of 1-butyl-3-methylimidazolium bromide [C4mim][Br] and 2.5 mol/L of 1-ethyl-3-methylimidazolium bromide [C2mim][Br], respectively. The studied ILs provided an excellent preliminary result in the extraction of anthocyanins. Significantly higher mass fractions of total and all free anthocyanins were extracted with 2.5 mol/L of [C2mim][Br] and 2.5 mol/L of 1-methylimidazolium hydrogen sulfate [mim][HSO4] than with conventional solvent with the exception of anthocyanin-3-O-acetylmonoglucosides in the latter. On the other hand, 2.5 mol/L of [C4mim][Br] and 2.5 mol/L of 1-(4-sulfobutyl)-3-methylimidazolium hydrogen sulfate [sC4mim][HSO4] showed significantly higher selectivity towards anthocyanin-3-O-acetylmonoglucosides and anthocyanin-3-(6-O-p-coumaroyl)monoglucosides.

Keywords

anthocyanins; grape skin; HPLC; ionic liquids; proanthocyanidins

Hrčak ID:

186561

URI

https://hrcak.srce.hr/186561

Publication date:

19.9.2017.

Article data in other languages: croatian

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