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

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

Natka Ćurko, Marina Tomašević, Marina Cvjetko Bubalo, Leo Gracin, Ivana Radojčić Redovniković, Karin Kovačević Ganić

Food Technol Biotechnol. 2017 Sep;55(3):429-437.

PMID: 29089857

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP681281878	1-Methylimidazolium hydrogen sulfate		681281-87-8	Price

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