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The work focuses on the study of two brown algae Dictyota dichotoma and   Dictyopteris membranacea. Extracts obtained by different organic solvents   (dichloromethane, hexane, acetone, methanol, chloroform) were screened for   their DPPH antiradical activity, whereas essential oils obtained by steam   distillation were chemically characterized by GC-MS. Steam distillation   yielded 0.07 and 0.095% of the essential oils for Dictyota dichotoma and   Dictyopteris membranacea, respectively. The chemical screening of the   essential oils of Dictyopteris membranacea and Dictyota dichotoma showed   similar chemical profiles. Namely, trans-anethole showed to be the main   component in both studied oils, yielding 12.28% and 10.70% for Dictyopteris   membranacea and Dictyota dichotoma, respectively. Antioxidant activity of   extracts was expressed by IC50 values and was in the range 0.375-1.72 mg/ml.

Chemical characterization of essential oils and antioxidant activity of Dictyota dichotoma and Dictyopteris membranacea