Fig. 8
py-TMAH-GC/MS chromatogram of sample 2 in the full retention time range, 0–40 min (a) and a narrower range, 16–30 min (b). The peaks up to 16.99 min are due to smaller lipid and amine fragments which are not diagnostic in this sample. The identification of pine resin was possible upon determination of the following markers: dimethyl azelate 1, methyl palmitate 2, methyl stearate 3, 7-oxo-dehydroabietic acid methyl ester 4 and methyl dehydroabietate 5. The mass spectra of compounds 4 (c) and 5 (d) are also shown