Evaluation of the antioxidant activity of rice bran extracts using different antioxidant assays

Shahzad Ali Shahid Chatha; Farooq Anwar; Maleeha Manzoor; Jawad -ur- Rehman Bajwa

doi:10.3989/gya.2006.v57.i3.56

Autores/as

Shahzad Ali Shahid Chatha Department of Chemistry, University of Agriculture, Faisalabad
Farooq Anwar Department of Chemistry, University of Agriculture, Faisalabad
Maleeha Manzoor Department of Chemistry, University of Agriculture, Faisalabad
Jawad -ur- Rehman Bajwa Department of Chemistry, University of Agriculture, Faisalabad

DOI:

https://doi.org/10.3989/gya.2006.v57.i3.56

Palabras clave:

Antioxidantes, Ensayos de actividad antioxidante, Fenoles totales, Oxidación, Porcentaje de inhibición

Resumen

Se evalúa la actividad antioxidante diferentes extractos (100% metanol, 80% metanol, 100% acetona and 80% acetona) de salvado de arroz -var. Super Kernel- mediante diferentes ensayos y utilizando aceite de girasol como substrato. Los ensayos utilizados fueron la estimación del % de inhibición de la peroxidación en sistemas con ácido linoleico, el contenido total en compuestos fenólicos y la pérdida de β-caroteno en sistemas con ácido linoleico. Adicionalmente, los concentrados de extractos de salvado de arroz se añadieron a aceite de girasol y las muestras se almacenaron a temperatura ambiente. La extensión de la oxidación se evaluó mediante el índice de peróxidos, el índice de p-anisidina, así como la formación de dienos y trienos conjugados.

El orden de la eficacia antioxidante de los extractos de salvado de arroz fue el siguiente: 80 % metanol> 100 % metanol > 80 % acetona > 100% acetona. Los resultados demostraron que los extractos del salvado de arroz de la variedad Super Kernel del arroz indígena de Paquistán son una fuente viable de antioxidantes naturales y podrían ser explotados como alimentos funcionales.

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