Sample :
1. Theobromine
2. Theophylline
3. Caffeine
(Left) Column : Shodex RSpak DE-413(4.6mmID*150mm) Eluent : H2O/CH3CN=75/25 Flow rate : 0.5mL/min Detector : UV(254nm) Column temp. : 30°C |
(Right) : Shodex RSpak DE-213(2.0mmID*150mm) : H2O/CH3CN=75/25 : 0.1mL/min : 30°C |