Chemometric analysis of gas chromatographic data of oils from Eucalyptus species.
Chemom. Intell. Lab. Syst., (1995)Abstract
Gas chromatograms (GCs) of oil extd. from Eucalyptus species have been compared using principal components anal. (PCA), linear discriminant anal. (LDA), and the Tanimoto distance in which the no. of similar peaks between two species are detd. Two systems were studied, a no. of examples of E. camaldulensis Dehnh. (River Red Gum) and clones of that species, and samples from two trees E. woodwardii Maiden and E. torquata Luehm. and a no. of their hybrids (E. torwoodii). The PCA revealed natural groupings of E. camaldulensis clones and showed, via loading plots, that eight intensities of the 180 times studied were sufficient to explain most of the variance and characterize each tree. The chem. species were identified by GC-mass spectrometry as alpha -pinene, 1,8-cineole, p-cymene, terpinen-4-ol/aromadendrene, cryptone, borneol, spathulenol, and torquatone. Each hybrid (E. torwood) of the trees E. woodwardii and E. torquata has a distribution of oils that lies between those of the parents. LDA was able to define two distinct groups and performed better than the Tanimoto distance in classifying the trees. on SciFinder (R)