Parameter Description
Column name Kromasil 100 C–18 (50 × 2.1 mm), 3.5 μ
Mobile phase* Acetonitrile: TEA buffer (0.1%TEA, pH 3±0.05  with OPA) 
Flow rate 0.8 mL/min
Weak Wash 9:1 (MQ water: Acetonitrile)
Strong Wash 1:9 (MQ water: Acetonitrile)
Detection UV at 240 nm
Column Temperature 40°C
Sample Temperature 25°C
Injection volume 2 μL
Run time 2.2 min
Table 1: UPLC Method Parameters.