2.5. Identification of components
Identification of the individual components was based (i) on
comparison of their GC retention indices (RI) on apolar and polar
columns, with those of authentic compounds (ii) on computer
matching with commercial mass spectral libraries (National
Institute of Standards and Technology, 1996; König et al., 2001;
Adams, 2007), and (iii) on comparison of the signals in the 13C
NMR spectra of the mixtures with those of reference spectra
compiled in the laboratory spectral library, with the help of a
laboratory-made software (Rezzi et al., 2002; Tomi and Casanova,
2006; Bighelli and Casanova, 2009).