Estabilidad oxıdativa y capacidad antioxidante del aceite esencial de Tropaeolum majus extraído por energía ultrasónica

Abstract

The aim was to determine the oxidative stability index and the antioxidant capacity of Tropaeolum majus essential oil extracted with ultrasonic energy. For this purpose, mastuerzo stems were collected from the district of Huasahuasi, Tarma Province, stored and transported to the Universidad Nacional del Centro del Perú. The samples were dried at room temperature (8% humidity) and subjected to grinding. To extract the essential oil, the dried stems were immersed in water in proportions of 1:10 and 1:20 for 1 hour, until reaching a humidity of 80%. They were subjected to ultrasound using frequencies of 70, 80 and 90% for 10, 15 and 20 min. A higher yield (0.3983±0.0135%), acidity index (1.82±0.20%) and antioxidant capacity (122.34±0.16 mg Trolox/g of sample) were obtained by means of the ratio stems:water (1:20), a frequency of 90% and 20 minutes of extraction. In refractive index (1.53 ±0.06) at a stems:water ratio (1:20), 80% frequency and 20 minutes of extraction. In optical density (0.880±0.04 g/ml) at a stems:leaf ratio (1:20), 90% frequency and 15 minutes of extraction. Finally, an oxidative stability index that allows to obtain a shelf life of 2.17 years at 18°C storage