|Concentration of each compound in standard solutions was as follows. C1: 3-CQA (40 mg/L), 4-CQA (20 mg/L), and 5-CQA (20 mg/L); C2: 3-CQA (160 mg/L), 4-CQA (80 mg/L), and 5-CQA (80 mg/L); C3: 3-CQA (320 mg/L), 4-CQA (160 mg/L), and 5-CQA (160 mg/L).|
coefficient of determination, number of calibration curve standards.
cSensitivity was expressed as the slope of the calibration curves.
dCalculated from the signal to noise ratio of 3 (LOD) and 10 (LOQ).