The spectra identification was performed using software
GC–MS solutions v. 2.5 (NIST 08 and NIST 08s) database
libraries. Standard alkane solution (C10–C40) prepared in
methanol was applied in the GC–MS under the same conditions
for extracts analysis to calculate the Kovats index
(KI) and Van der Dool and Kratz (AI) (Adams, 2009). The
values found were compared with the literature data, for
the same analysis conditions. For the quantification of the
major sesquiterpenes, we used the external standardization
method, using as external standard the monoterpene
R-(+)-limonene (y = 48221.1229 + 21191.0373x; R2 = 0.9957) in
different concentrations in the same conditions for GC–MS
analysis of the extracts.