ISLA Maria Ines
Antioxidant activity and chemical composition of essential oils of three aromatic plants from La Rioja province
NATALIA BARBIERI , MILENA COSTAMAGNA , MIGUEL GILABERT , MARINA PEROTTI , CAROLA SCHUFF , MARıA ISLA , AND ALBA BENAVENTE
TAYLOR & FRANCIS INC
Lugar: Londres; Año: 2015 p. 1 - 6
Context: The use of many traditional medicinal plants is often hampered by the absence of a proper biochemical characterization, which is essential to identify the bioactive compounds present in it. The essential oils (EOs) of three native species from the La Rioja province were analyzed: Lippia turbinata Griseb and Lippia integrifolia (Griseb.) Hieron (Verbenaceae), and Clinopodium gilliesii (Benth.) Kuntze (Lamiaceae). Objective: The aim of this study was to evaluate their EOs antioxidant activity (AA) and their chemical composition. Materials and methods: EOs were analyzed by gas chromatography-mass spectrometry (GC-MS). To enhance the aqueous solubilization of the EOs, EO?water emulsions were prepared (concentration range of 0.1?6 mg/mL). AA was determined using ABTS, DPPH, and peroxyl radical scavenging assays, as well as by the b-carotene bleaching test. Results: Piperitenone oxide was a major constituent in L. turbinata, pulegone and piperitenone oxide in C. gilliesii, and b-caryophyllene in L. integrifolia. Lippia turbinata EO was the most active ABTS and DPPH radical scavenger (SC50 values of 0.40 ± 0.14 and 0.74 ± 0.08 mg/ mL,respectively). Clinopodium gilliesii EO exhibited the highest hydrogen peroxide scavenging activity (SC25 value ¼ 1.52 ± 0.27 mg/mL). In the b-carotene assay, L. turbinata EO was more effective at inhibiting lipid peroxidation than the other two oils (IC25 value ¼ 0.15 ± 0.04 mg/ mL). Conclusion: Our results suggest that the AA observed can be justified by the presence of oxygenated monoterpenes, mainly piperitenone oxide. Finally, L. turbinata EO might be used as a safe natural antioxidant and food preservative in the food and cosmetic industries.