Long-term storage of three unconventional oils | Conservación a largo plazo de tres aceites no convencionales
2008
Mariod, A. | Matthäus, B. | Eichner, K. | Hussein, I.H.
Spanish; Castilian. Tres muestras de aceite, Sclerocarya birrea oil (SCO), Melon bug oil (Aspongubus viduatus) (MBO), y Sorghum bug oil (Agonoscelis pubescens) (SBO), fueron almacenadas en la oscuridad a 30 +/- 2 grados C durante 24 meses. Cada 2- 4 meses se toman alícuotas para analizar los cambios de calidad. Se determinaron la composición en ácidos grasos, el contenido en tocoferol, el índice de peróxidos y la estabilidad oxidativa mediante el aparato Rancimat. Después de 24 meses de almacenamiento, la composición en ácidos grasos no experimentó variación mientras que el contenido en tocoferol disminuyó en los tres aceites. SCO y MBO mostraron cambios minoritarios como se comprobó por los índices de peroxidos y estabilidad a los 24 meses. SBO fue el menos estable de los tres aceites.
Show more [+] Less [-]English. Three samples, Sclerocarya birrea oil (SCO), Melon bug oil (Aspongubus viduatus) (MBO), and Sorghum bug oil (Agonoscelis pubescens) (SBO), were stored (autoxidized) in the dark at 30 +/- 2 grados C for 24 months. Oil aliquots were withdrawn every 2-4 month for analyses of changes in four quality indexes, namely fatty acid composition, tocopherol content, peroxide value and oxidative stability index by Rancimat. After 24 months of storage the fatty acid composition of the three oils showed no change while tocopherol contents were decreased. SCO and MBO showed only slight changes in their oxidative stability as indicated by the peroxide value and induction period during the 24 months of storage. Sorghum bug oil showed a periodical increase in the peroxide value and had less stability as measured by the Rancimat in comparison to other oils.
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