The main chemical compounds identified via GC/MS and GC/FID
in the upper fractions are listed in Table 5, while those identified in
the bottom fractions are reported in Table 6. The concentration of
each compound was calculated using the results of the FID
chromatogram and relative response factors (RRF) following the
methodology suggested in a previous paper [21]. The bio-oils were
dissolved in acetonitrile at a concentration of 50 mg/mL and the
concentration of the identified compounds, reported in Tables 5
and 6, refers to these solutions. The GC/FID of WP12L_U and
WP12L_B and total ion chromatogram (TIC) of WP12L_BOT are
reported in Fig. 4 for a visual comparison.