Rapid analysis of major components and potential authentication of South African olive oils by quantitative ¹³C nuclear magnetic resonance spectroscopy
Date
2004
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Academy of Science for South Africa
Abstract
We have developed a rapid, quantitative ¹³C NMR spectroscopic method for the determination of the major fatty acids (oleic, linoleic and saturated acids) contained as triacylglycerides in South African extra-virgin olive oils. With the judicious use of a shiftless NMR relaxation agent, Cr(acetylacetonate)3, it is possible to determine the principal fatty acids in 0.4 g of olive oil within 20 min. This method also allows for the estimation of the distribution of the oleic and linoleic acids in the naturally occurring triacylglycerides in olive oils, expressed as α/β ratios for the triacylglycerides. Moreover, a fake product, marketed in South Africa as an 'extra-virgin olive oil', was also analysed to demonstrate the use of ¹³C NMR spectroscopy as a rapid means of establishing the authenticity of the claimed product on the local market. We further examined a selection of extra-virgin olive oils produced in various regions of the Western Cape province in 2002 and 2003, using ¹³C NMR spectroscopy, in a preliminary attempt to determine their major fatty acid compositions, and to establish whether any regional and cultivar-based differences in these products can thereby be detected.
Description
CITATION: McKenzie, J. M. & Koch, K. R. 2004. Rapid analysis of major components and potential authentication of South African olive oils by quantitative ¹³C nuclear magnetic resonance spectroscopy. South African Journal of Science, 100(7-8):349-354.
The original publication is available at https://journals.co.za
The original publication is available at https://journals.co.za
Keywords
Olive oil, Fatty acids
Citation
McKenzie, J. M. & Koch, K. R. 2004. Rapid analysis of major components and potential authentication of South African olive oils by quantitative ¹³C nuclear magnetic resonance spectroscopy. South African Journal of Science, 100(7-8):349-354