Table 3.

Summary of HPLC method performance: linear equation, linear ranges, and coefficients of phenolic compounds (n = 3).

Phenolic compounds	Retention time (min)	Slope	Intercept	Linear range (μmol/mL)	R 2
Gallic acid	7.23 ± 0.07	1.20 × 109 ± 0.06 × 109	−1.00 × 104 ± 0.55 × 104	0.01–1.18	0.999
Catechin	15.51 ± 0.11	1.18 × 108 ± 0.04 × 108	−5.17 × 102 ± 0.14 × 102	0.01–0.65	0.999
p-Hydroxybenzoic acid	17.61 ± 0.11	5.78 × 108 ± 0.12 × 108	2.96 × 103 ± 1.13 × 103	0.01–1.45	0.999
Vanillic acid	22.92 ± 0.12	7.34 × 108 ± 0.23 × 108	−6.89 × 103 ± 1.66 × 103	0.01–1.31	0.999
Caffeic acid	23.94 ± 0.12	1.24 × 109 ± 0.07 × 109	−1.50 × 104 ± 0.6 × 104	0.01–1.11	0.999
Ferulaic acid	31.73 ± 0.09	8.15 × 109 ± 0.25 × 109	−4.15 × 103 ± 1.66 × 103	0.01–0.20	0.999
Rutin	32.34 ± 0.13	8.26 × 108 ± 0.49 × 108	1.99 × 103 ± 0.40 × 103	0.01–0.33	0.999
Benzoic acid	34.11 ± 0.14	9.55 × 107 ± 0.36 × 107	3.32 × 103 ± 0.98 × 103	0.02–2.05	0.999
Quercetin	45.49 ± 0.15	9.61 × 108 ± 0.33 × 108	−5.11 × 103 ± 1.23 × 103	0.01–0.33	0.999