TITLE:
Quality of Canola Oil Obtained by Conventional and Supercritical Fluid Extraction
AUTHORS:
Rabie Khattab, Curtis Rempel, Miyoung Suh, Usha Thiyam
KEYWORDS:
Canola Oil; Quality; Supercritical Fluid Extraction
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.3 No.12A,
December
31,
2012
ABSTRACT: Quality of canola oil obtained by the supercritical
fluid extraction (SFE), using CO2 with ethanol as a co-solvent, was
evaluated and compared to that of the conventionally-obtained oils using either n-hexane or chloroform methanol mixture. Physical
characteristics, chemical properties, fatty acid composition and phenolic
profile of oils were investigated. The SFE oil showed significantly lower
melting point, peroxide value (PV) and higher free fatty acids (FFAs) and iodine
value (IV) than the n-hexane-extracted
one. There were no significant differences in the fatty acid composition of
different oils. The SFE oil showed significantly higher phenolic content
(35.91, 10.15, 3.16, 0.32 and47.48mg/g of sinapic acid, sinapine, sinapoyl glucose, canolol and total
phenolics) as compared to 0.08, 0.70, 0.88, 0.45 and0.71mg/g,
respectively in the n-hexane-extracted
oil. These results indicate the superiority of SFE and advocate its use for the
extraction of highly stable and functional canola oil for further health and
nutraceutical uses. The present results have an industrial and technological
relevance as SFE could be competitive with the traditional extraction
techniques providing an environmental approach and enhancing the obtained oil
quality and stability. After recovery of the initial installation costs, SFE
could be more economic than conventional extraction. However, further
economical studies are needed to validate this last conclusion.