Table 1. HPLC condition for analyzing phenolic compounds

Items	Conditions
Instrument	Arc HPLC system(Waters, Milford, MA, USA)
Column	Zorbax eclipse XDB-C18 4.6×250 mm, 5 μm(Agilent technologies, SantaClara, CA, USA)
Detector	PDA Detector(Ex: 210 nm, Em: 280 nm)(2998, Waters, Milford, MA, USA)
Mobile phase	A: 0.1% formic acid in 10% AcetonitrileB: 0.1% formic acid in 90% Acetonitrile
Gradient	0-2 min	A : B = 100 : 0
	2-8 min	A : B = 100 : 0
	8-35 min	A : B = 90 : 10
	35-40 min	A : B = 45 : 55
	40-45 min	A : B = 50 : 50
	45 min	A : B = 100 : 0
Flow rate	1.0 mL/min
Column temp	35°C
Injection volume	10 μL