lead to the generally unique
fingerprint for each compound. However detailed interpretation
of IR bands in this region is difficult. Beside, the intervals 6 and
7, relating to the spectral region of 3116–2762 cm1 (related to
the CAH, OAH and NAH vibrations) is in the second order of
importance [29]. The pattern distribution of the oil samples in
the three-dimensional plot of PLS scores (for interval 17),