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Se obtuvieron extractos de hojas y tallos de salvia (Salvia officinalis, Fam. Labiatae) y romero (Rosmarinus officinalis, Fam. Labiatae) y de hojas de guayaba (Psidium guajava Fam. Myrtaceae), empleando co2 en estado supercrítico. Se obtuvieron modelos polinómicos para relacionar el rendimiento de extractos con las condiciones de su obtención. La composición de la fracción volátil de los extractos se determinó por medio de Gc-MS. Se midieron la capacidad antioxidante (oRAc) de los extractos y el grado de protección que ofrecen al agregarse a una base cosmética sometida a oxidación lipídica por acción de la radiación UV. El extracto de romero mostró el mayor porcentaje de inhibición de la oxidación lipídica (88%), seguido por el de salvia (76%) y el de hojas de guayaba (43%). Los extractos de romero y salvia exhibieron una capacidad antioxidante alta (1,9 μmol Trolox®/mg), similar a la del BHT y la vitamina E (2,8 y 3,0 μmol Trolox®/mg), mayor que la del extracto de hojas de guayaba (0,7 μmol Trolox®/mg).
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