期刊
FOOD CHEMISTRY
卷 110, 期 1, 页码 263-272出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2008.02.001
关键词
antiradical activity; antioxidants; hydrolysable tannins; model systems; oak chips
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-clectrospray 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 polyplienol 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 exerted a proportional antioxidant effect. The analytical examination by liquid chromatography-mass spectrometry revealed that the compounds implicated are hydrolysable tannins and hydrolysis products thereof. (C) 2008 Elsevier Ltd. All rights reserved.
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