Antioxidant activity of various plant extracts under ambient and accelerated storage of sunflower oil

Farooq Anwar; Amer Jamil; Shahid Iqbal; Munir A. Sheikh

doi:10.3989/gya.2006.v57.i2.36

Autores/as

Farooq Anwar Department of Chemistry, University of Agriculture Faislabad
Amer Jamil Department of Chemistry, University of Agriculture Faislabad
Shahid Iqbal Department of Chemistry, University of Sargodha
Munir A. Sheikh Department of Chemistry, University of Agriculture

DOI:

https://doi.org/10.3989/gya.2006.v57.i2.36

Palabras clave:

Antioxidant activity, Inhibition, Plant extracts, Sunflower oil

Resumen

El presente trabajo se ha realizado para investigar la capacidad antioxidante potencial de once plantas medicinales o económicamente importantes autónomas del Pakistán. Las plantas se extractaron con metanol al 80% y se estudia su capacidad antioxidante bajo diferentes condiciones de almacenamiento, utilizando aceite de girasol y soja como sustratos. Los ensayos previos de capacidad antioxidante se llevaron a cabo con la prueba TLC-test y midiendo el porcentaje de inhibición de la peroxidación del ácido linoleico. El rizoma de Iris germanica, las hojas de Lawsonia alba, y M. oleifera, las semillas de café (Coffee arabica), el salvado de arroz (Oryza sativa), el salvado de trigo y salvado, granos y cáscara de avena (Avenis sativa), que fueron las que tuvieron una mayor capacidad antioxidante, de todos los extractos, se ensayaron después usando los sustratos de girasol y soja. Los aceites vegetales se estabilizaron con una dosis de 0,12 (peso/peso) y se sometieron a ensayos de almacenamiento acelerados (15 días a 65º) o temperatura ambiente (6 meses). El deterioro oxidativo se siguió mediante la medida del índice de actividad (AI), índice de peróxido (PV), así como por el contenido de dienos y trienos. En general, los extractos de semillas de café, partículas y cáscaras de avena, y Iris germanica y hojas de M. oleifera fueron las que mostraron una mayor efectividad para extender la estabilidad de los aceites, y retardar la elevación del PV, así como en la prevención de la aparición de productos de oxidación primarios y secundarios. El orden de eficacia fue: partículas y cáscaras de avena > granos de café > hojas de M. oleifera > Lawsonia alba > Iris germanica > salvado de arroz > salvado de trigo. Se detectaron diferencias significativas en el potencial antioxidante de algunos extractos tanto a temperatura ambiente como en condiciones de las pruebas aceleradas. Ello demostró una amplia gama de propiedades antioxidante de los extractos frente a los diferentes procedimientos analíticos empleados.

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