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Extraction of phenolics in liquid model matrices containing oak chips: Kinetics, liquid chromatography–mass spectroscopy characterisation and association with in vitro antiradical activity by Evangelia Karvela; Dimitris P. Makris; Panagiotis Kefalas; Michael Moutounet is a Agricultural and Biological Sciences article available to read on EtoBox.

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Four different liquid model matrices were utilised to study the leaching of polyphenols from oak chips. The matrices included distilled water, 12% (v/v) ethanol, 12% (v/v) ethanol adjusted to pH 3.4, and 55% (v/v) ethanol. Extraction of phenolics into the liquid systems was monitored by the estimation of the total polyphenol concentration, using the Folin-Ciocalteu method. The in vitro antiradical activity was also recorded using the stable DPPH radical, to ascertain enrichment of the solutions with potentially antioxidant compounds. As a final step, the polyphenolic composition of each matrix was characterised by means of liquid chromatography-electrospray ionisation mass spectrometry. The kinetics of polyphenol leaching into the liquid phase was found to obey a 2nd parameter power equation of the type y=ax(b), which produced a good fit of the data (p<0.0001). Kinetics was faster in distilled water up to a point, where after polyphenol extraction occurred at higher rate in the 55% ethanolic solution. The antiradical activity in all cases was highly correlated with total polyphenol concentration (p<0.001), providing that the amount of polyphenols extracted into the liquid media exe

Who reads Extraction of phenolics in liquid model matrices containing oak chips: Kinetics, liquid chromatography–mass spectroscopy characterisation and association with in vitro antiradical activity?

Author

Evangelia Karvela; Dimitris P. Makris; Panagiotis Kefalas; Michael Moutounet

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0308-8146)

Published

2008

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)