Table 1. HPLC condition for analysis

Parameter	Condition
HPLC	Prominance 20A (Shimadzu, Japan)
Mobile phase	Water(0.1% phosphoric acid) : acetonitrile
Column	Sunfire C18 (4.6 × 250 mm, 5 μm)
Wavelength	230, 330 nm
Injection volume	10 μL
Oven temperature	35°C
Flow rate	1.0 mL/min