Composition and chemical variability of the oleoresin of Pinus nigra ssp. laricio from Corsica

Eighteen samples of oleoresin of Pinus nigra ssp. laricio were harvested in six locations in Corsica. Eight diterpene acids, six neutral diterpenes and α-pinene were identified and their contents calculated by 13C NMR spectroscopy, following a procedure recently developed in our laboratories. The results were submitted to chemometric analysis (k-means and principal component analysis) and two clusters were distinguished with respect to the contents of levopimaric acid and dehydroabietic acid.