Table 2.

Retention time, linear range, calibration curve, limit of detection, limit of quantification, precision, stability, repeatability, and recovery of 10 reference standards.

Standard	Retention time (min)	Calibration curve	R2	Linear range (mg L−1)	LOD (μg L−1)	LOQ (μg L−1)	Precision		Stability		Repeatability		Standard recovery rate (%)
							Peak area RSD (%)	Retention time RSD (%)	Peak area RSD (%)	Retention time RSD (%)	Peak area RSD (%)	Retention time RSD (%)
Gallic acid	5.07	y = 79.451x -2.9812	0.9999	0.15–15	0.06	0.41	1.07	0.47	0.84	0.06	0.42	0.06	98.47
Protocatechuic acid	7.68	y = 67.397x +1.481	0.9997	0.5–50	0.71	2.64	1.98	0.61	1.25	0.03	1.51	0.14	99.51
Chlorogenic acid	9.50	y = 39.726x -2.541	0.9999	0.8–80	3.22	10.44	0.94	0.53	2.71	0.36	2.25	0.26	100.71
Caffeic acid	11.39	y = 29.151x ‐ 4.516	0.9999	0.2–20	1.24	5.43	0.82	1.12	2.28	0.02	1.54	0.13	101.34
p-Coumaric acid	15.66	y = 129.262x +3.477	0.9998	0.6–60	0.03	1.16	1.17	0.18	0.87	0.01	2.26	0.07	96.72
Rutin	16.68	y = 49.814x ‐ 3.431	0.9999	0.2–20	1.24	5.37	1.08	0.36	1.04	0.01	3.75	0.06	98.76
Ferulic acid	18.32	y = 29.385x -1.037	0.9979	0.5–10	0.49	0.74	1.41	0.79	1.41	0.01	2.53	0.02	96.45
Salicylic acid	30.25	y = 89.177x +2.385	0.9998	0.7–70	0.15	0.24	0.97	0.37	0.79	0.09	1.65	0.16	86.92
Cinnamic acid	33.87	y = 57.221x -13.713	0.9998	0.5–50	0.03	0.22	1.13	0.06	1.68	1.26	1.82	0.14	96.55
Kaempferol	38.42	y = 35.216x -4.172	0.9999	0.05–5	0.51	1.57	3.79	0.09	1.72	1.96	2.24	0.38	105.29