Flow 1.0 mL/min 1.5 mL/min Injection volume 5 µL with 3.0 s flush port wash 4 µL with 5.0 s flush port wash Table 1 Chromatographic parameters used for the Aijiren LC and Aijiren LC systems. Concentration levels Ascorbic acid (µg/mL) Citric acid (µg/mL) Benzoic acid (µg/mL) 1 10 5500 0.2 2 45 6000 1