Open AccessStability of rice bran oil extracted by SFE and soxhlet methods during accelerated shelf-life storage
Author(s) -
Abdul Basit Mariod,
Maznah Ismail,
Nor Faiza Abd Rahman,
Bertrand Matthäus
Publication year - 2014
Publication title -
grasas y aceites
Language(s) - Spanish
Resource type - Journals
eISSN - 1988-4214
pISSN - 0017-3495
DOI - 10.3989/gya.109413
Subject(s) - chemistry , unsaponifiable , rice bran oil , supercritical fluid extraction , chromatography , supercritical fluid , bran , food science , organic chemistry , extraction (chemistry) , raw material
Supercritical fluid high oryzanol (SFE HO) and supercritical fluid low oryzanol (SFE LO) rice bran oils were obtained and compared with that extracted by the Soxhlet (SOX) method. Their composition and stability during storage were determined. The amount of unsaponifiable matter and gamma oryzanol of SFE samples were significantly (p < 0.05) higher than SOX. While the amount of tocopherol in SOX (4.0 mg·g-1) was higher than that reported in SFE HO and SFE LO, at 3.2 and 2.6 mg·g-1, respectively. After storage for 42 days at 70 °C the PV, FFA%, conjugated diene and p-anisidine values of SOX were higher than those of SFE HO, and SFE LO. The SFE samples showed better stability than SOX under successive heating and the addition of BHA decreased PV, FFA%, conjugated diene and p-anisidine levels in all samples. Se realizaron extracciones mediante fluido supercrítico de salvado de arroz con alto (SFE HO) y bajo (SFE LO) contenido en orizanol y se comparó con los extraídos mediante Soxhlet (SOX). Se determinó la composición y la estabilidad durante el almacenamiento. La materia insaponificable y el gamma orizanol de las muestras SFE fueron significativamente más altas (p < 0,05) que SOX. Mientras la cantidad de tocoferol en SOX (4,0 mg·g-1) fue mayor que lo encontrado para SFE HO y SFE LO, 3,2 y 2,6 mg·g-1 respectivamente. Después de 42 días de almacenamiento a 70 °C los valores de PV, FFA %, dienos conjugados y p-anisidina de SOX fueron mayores que los de SFE HO, y SFE LO. Las muestras SFE mostraron mejor estabilidad que SOX bajo calentamiento y la adición de BHA disminuyó el PV, FFA %, dienos conjugados y los niveles de p-anisidina en todas las muestras