Extraction and quantitation steps were carried-out in duplicate for each sample. The standard
solutions used for the calibration curve were regularly injected at intervals between sample injections
to confirm the retention times. The chromatograms shown in Figures 1 and 2 correspond to a standard
and extracted solution, respectively; they reveal that capsaicin (a) and dihydrocapsaicin (b) are eluted
at 4.69 and 6.51 min, respectively.
Figure 1. Chromatogram of the standard solution corresponding to 100 μg/g of capsaicin
and dihydrocapsaicin (conditions: column Betasil C18 (150 × 4.6 mm × 3 μm), mobile
phase: H2O/CH3CN, 50:50 v/v, flow rate: 1.5 mL/min, UV detection at 222 nm).