Table 3.

Calibration curve data for the reference compounds (n = 5).

Compound	Retention Time, min	Linear Regression Equation	R2
Lactic acid	0.30 ± 0.01	y = 1.967 × 103x + 0.561 × 103	0.9913
Gallic acid	0.55 ± 0.05	y = 1.779 × 105x + 0.511 × 103	0.9996
Benzoic acid	1.23 ± 0.02	y = 4.066 × 105x − 9.802 × 103	0.9992
Chlorogenic acid	2.55 ± 0.20	y = 2.586 × 105x + 13.606 × 103	0.9991
Vanillic acid	3.12 ± 0.02	y = 4.022 × 105x + 7.491 × 103	0.9988
Caffeic acid	3.41 ± 0.05	y = 2.103 × 105x + 15.115 × 103	0.9989
Syringic acid	3.78 ± 0.03	y = 2.552 × 105x − 2.430 × 103	0.9993
Salicylic acid	4.06 ± 0.10	y = 0.644 × 105x + 0.347 × 103	0.9996
Coumaric acid	4.34 ± 0.06	y = 2.834 × 105x + 1.135 × 103	0.9991
Ferulic acid	4.96 ± 0.04	y = 2.984 × 105x + 3.121 × 103	0.9994
Rutin	5.49 ± 0.06	y = 2.733 × 105x + 5.876 × 103	0.9974
Ellagic acid	5.59 ± 0.02	y = 7.343 × 105x − 39.101 × 103	0.9994
Coumarin	5.84 ± 0.03	y = 4.232 × 105x + 0.726 × 103	0.9975
Myricetin	6.82 ± 0.04	y = 2.293 × 105x − 13.132 × 103	0.9987
Hesperidin	7.09 ± 0.02	y = 8.740 × 103x + 0.431 × 103	0.9995
Quercetin	7.92 ± 0.05	y = 4.158 × 105x − 15.251 × 103	0.9991
Luteolin	8.07 ± 0.08	y = 2.753 × 105x − 1.610 × 103	0.9996
Naringenin	9.00 ± 0.04	y = 1.293 × 105x − 3.407 × 103	0.9982