Sample :
1. Aspirin (Acetylsalicylic acid)
2. Aminopyrine
3. Antipyrine
4. Caffeine
5. Phenacetin
Column : Shodex RSpak DM-614 (6.0mmID*150mm) Eluent : 0.035M Na2HPO4 + 0.030M KH2PO4 + 35% CH3OH Flow rate : 0.6mL/min Detector : UV(254nm) Column temp. : 27°C