Table 2.
Operating conditions of HPLC for analyzing organic acid contents

Items	Conditions
Instrument	Agilent 1260 Infinity
Column	PL Hi-Plex H (ɸ7.7 mm×300 mm, Agilent)
Column temp.	65°C
Detector	UV Detector
Mobile phase	0.005 M Sulfuric acid
Flow rate	0.6 mL/min
Injection volume	20 μL
Running time	20 min