Composition and chemical variability of the triterpene fraction of dichloromethane extracts of cork (Quercus suber L.)
2002
Castola, V. | Bighelli, A. | Rezzi, S. | Melloni, G. | Gladiali, S. | Desjobert, J.M. | Casanova, J.
Dichloromethane extracts were prepared from 38 samples of cork harvested in different locations of Corsica and Sardinia from individual trees of Quercus suber L. Friedelin, 3-alpha-hydroxyfriedelan-2-one, betulin, betulinic acid, beta-sitosterol and sitost-4-en-3-one were identified and their molar percentages were calculated by 13C NMR spectroscopy, following a procedure recently developed by our group. The results were submitted to chemometric analysis (k-means and principal component analysis), which allowed three groups to be distinguished with respect to the content of friedelin, betulinic acid and 3-alpha-hydroxyfriedelan-2-one.
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