Vasiliki Lagouri - A comparison of the antioxidant activity and phenolic content of non-polar and polar extracts obtained from four endemic Lamiaceae species grown in Greece

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      Publication Details (including relevant citation   information):

      Lagouri V., Mpantouna A. and Stathopoulos P.   (2010):  J. Food Process. Pres. (34), 872-886

      Abstract:

      This study was designed to compare the phenolic content and   antioxidant properties of non-polar and polar fractions of   Origanum onites, O. dictamnus, Thymus vulgaris and Rosmarinus   officinalis that are grown in the same region (Crete, Greece). In   the b-carotene/linoleic acid system the hexane extracts showed   higher antioxidant activity (P < 0.05) than methanol and

      dichoromethane extracts did (mean value: 73.53, 52.79 and 33.5%,   respectively). Oregano exhibited stronger antioxidant activity (P   < 0.05) than rosemary, thyme and dittany. The dichloromethane   and methanol extracts appeared to have a higher radical   scavenging activity (P < 0.05) than the hexane extracts (mean   50% inhibition value: 1.62, 1.21 and 7.71, respectively). The   dichloromethane extracts showed strong inhibition in the corn oil   oxidation (up to 81.1%), which is higher when compared with that   of butylated hydroxytoluene (42.07%). Rosemary was a stronger   inhibitor in the oil oxidation (P < 0.05) than oregano, thyme   and dittany. High and positive correlations were observed between   the total flavonoids of the methanol plant

      extracts and their antioxidant activity in all the three assays.

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