Table 1.

Calibration curves, limits of detection (LODs), and limits of quantification (LOQs) of the six analytes.

Analyte	Linear Equation a	R 2 b	Linear Range (μg/mL)	LOD (μg/mL) c	LOQ (μg/mL) d
Bisdemethoxycurcumin	y = 101,215x − 75,414	0.9999	3.13–100	0.20	0.67
Demethoxycurcumin	y = 87,918x − 66,314	1.0000	1.56–100	0.26	0.88
Curcumin	y = 86,839x − 64,613	0.9999	1.56–100	0.31	1.04
ar-Turmerone	y = 26,801x − 33,652	1.0000	6.25–400	0.73	2.45
β-Turmerone	y = 69,449x − 49,841	1.0000	3.13–200	0.51	1.71
α-Turmerone	y = 35,041x − 46,310	1.0000	3.13–200	0.91	3.02

^ay, peak area; x, concentration of the analytes (μg/mL); ^b the correlation coefficient; ^c limit of detection (S/N = 3); ^d limit of quantification (S/N = 10).