Abstract
In this study, the fatty acid compositions of Turkish virgin olive oils produced in the Izmir province, an important olive production region of Turkey, were classified by chemometric methods: principal component analysis (PCA) and discriminant analysis (DA). A total of 103 oil samples were examined over the course of two harvest years (2001–2002 and 2002–2003). The samples were divided into five groups according to olive growing zones: North (Ayvalik cultivar), East (Memeli, Memecik, Domat and Gemlik cultivars), South (Memecik cultivar), Izmir Penisula (Erkence cultivar) and Firms (poly-varietial oils or commercial blends). Consistent with discriminant analysis (DA), the predicted grouping in terms of the two harvest years were correctly separated as 84.6 and 85.9%, respectively. The highest levels of predicted grouping for the two harvest years were found in the North (Ayvalik cultivar) and Izmir peninsula (Erkence cultivar) groups (as 100%). In addition to oleic, linoleic, linolenic, margaric and margoleic acids, total trans isomers of linoleic, linolenic and palmitic/linoleic were determined to be the best descriptive components for the oil samples.
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Acknowledgments
The authors are grateful to Mr. Metin Aydogdu (Agric. Eng. Department of Geographical Information Systems, Ministry Agriculture and Rural Affairs, Ankara) for the map of Izmir Province.
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Diraman, H., Saygi, H. & Hisil, Y. Relationship Between Geographical Origin and Fatty Acid Composition of Turkish Virgin Olive Oils for Two Harvest Years. J Am Oil Chem Soc 87, 781–789 (2010). https://doi.org/10.1007/s11746-010-1557-2
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DOI: https://doi.org/10.1007/s11746-010-1557-2