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Issue 6 (1) 2007 pp. 27-36

Beata Drużyńska, Agnieszka Stępniewska, Rafał Wołosiak

Warsaw Agricultural University SGGW

THE INFLUENCE OF TIME AND TYPE OF SOLVENT ON EFFICIENCY OF THE EXTRACTION OF POLYPHENOLS FROM GREEN TEA AND ANTIOXIDANT PROPERTIES OBTAINED EXTRACTS

Abstract The aim of the study was to investigate the influence of the type of solvent and time on efficiency of the extraction of polyphenols and antioxidant properties extracts obtained from green tea. Extraction was conducted at room temperature using four solvents: water and 80% ethanol, 80% methanol and 80% acetone (water solutions, v/v) at 15, 30 and 60 minutes. Extracts were analysed for contents of polyphenols and catechins. The antioxidant properties have been determined by two methods: scavenging activity against DPPH· and the method with ABTS·+. The abilities of extracts to chelate iron ions (II) have been investigated too. On the basis of findings it turned out that both type of solvent and time have a significant influence on extraction of polyphenols from green tea. The best solvent for the extraction of total polyphenols was 80% acetone, whereas for catechins was water. The increase of extraction of polyphenols with prolonged extraction time was observed. All extracts had antioxidant properties against DPPH· and ABTS·+ and abilities to chelate iron ions (II).
Keywords: efficiency of extraction, polyphenols, green tea, antioxidant properties
pub/.pdf Full text available in english in Adobe Acrobat format:
http://www.food.actapol.net/issue1/volume/3_1_2007.pdf

For citation:

MLA Drużyńska, Beata, et al. "THE INFLUENCE OF TIME AND TYPE OF SOLVENT ON EFFICIENCY OF THE EXTRACTION OF POLYPHENOLS FROM GREEN TEA AND ANTIOXIDANT PROPERTIES OBTAINED EXTRACTS." Acta Sci.Pol. Technol. Aliment. 6.1 (2007): 27-36.
APA Drużyńska B., Stępniewska A., Wołosiak R. (2007). THE INFLUENCE OF TIME AND TYPE OF SOLVENT ON EFFICIENCY OF THE EXTRACTION OF POLYPHENOLS FROM GREEN TEA AND ANTIOXIDANT PROPERTIES OBTAINED EXTRACTS. Acta Sci.Pol. Technol. Aliment. 6 (1), 27-36
ISO 690 DRUżYńSKA, Beata, STęPNIEWSKA, Agnieszka, WOłOSIAK, Rafał. THE INFLUENCE OF TIME AND TYPE OF SOLVENT ON EFFICIENCY OF THE EXTRACTION OF POLYPHENOLS FROM GREEN TEA AND ANTIOXIDANT PROPERTIES OBTAINED EXTRACTS. Acta Sci.Pol. Technol. Aliment., 2007, 6.1: 27-36.