Sample :
1. Aspirin (Acetylsalicylic acid)
2. Caffeine
3. Salicylamide
4. Aminopyrine
5. Phenacetin
Column : Shodex RSpak DS-613 (6.0mmID*150mm) Eluent : 1/15M Phosphate buffer(pH7.2)/CH3CN=75/25 Flow rate : 1.0mL/min Detector : UV(254nm) Column temp. : 40°C