2.6.2. Linearity
For each run, five standard stock solutions were prepared and
analyzed with three independent injections; the concentrations
ranged between 5 and 125 mg/mL for synephrine and between 0.1 and 5 mg/mL for the other amines. Linear regressions were obtained
by plotting the areas of analyte peaks vs the nominal
concentrations. The calibration curve equations and the corresponding
correlation coefficients (R2) were calculated using both
detectors.