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Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales
Print version ISSN 0370-3908
Abstract
RODRIGUEZ, Edwin Alexander et al. RENDIMIENTO Y CAPACIDAD ANTIOXIDANTE DE EXTRACTOS DE ROSMARINUS OFFICINALIS, SALVIA OFFICINALIS Y PSIDIUM GUAJAVA OBTENIDOS CON CO2 SUPERCRÍTICO. Rev. acad. colomb. cienc. exact. fis. nat. [online]. 2012, vol.36, n.140, pp.305-316. ISSN 0370-3908.
Extracts from stems and leaves of sage (Salvia officinalis, Labiatae Fam.) and rosemary (Rosmarinus officinalis, Labiatae Fam.) and from guava leaves (Psidium guajava, Myrtaceae Fam.), were obtained using supercritical CO2. Polynomic models were formulated to relate yield with extraction conditions. The compositions of the volatile fractions of these extracts were determined using GC-MS. Their antioxidant capacity (ORAC) and the protection resultant from their addition to a cosmetic base subjected to lipid peroxidation as a result of its exposure to UV radiation were also measured. The extract from rosemary imparted the highest lipid peroxidation inhibition (88%), followed by those obtained from sage (76%) and guava leaves (43%). Rosemary and sage extracts exhibited a high antioxidant capacity (1,9 µmol Trolox®/mg), similar to those of BHT and vitamin E (2,8 and 3,0 µmol Trolox®/mg), respectively, and higher than that of the guava leaves extract (0,7 µmol Trolox®/mg).
Keywords : Salvia officinalis; Rosmarinus officinalis; Psidium guajava; supercritical; antioxidant; ORAC; lipid peroxidation; hexanal.