Table 1. Conditions of HPLC analysis for phenolic acid

Parameters	Conditions
Injection volume	10 μL
Detector	DAD
Wavelength	254, 320 nm
Column temperature	30°C
Flow rate	1.0 mL/min
Mobile phase	A: 1% formic acid in water,B: Methanol
Gradient program	Time (min)	A (%)	B (%)
	0	95	5
	5	95	5
	10	90	10
	15	90	10
	20	80	20
	25	80	20
	30	70	30
	40	55	45
	50	40	60
	55	40	60
	60	5	95
	65	5	95
	70	95	5
	75	95	5