Column : Shodex IEC SP-420N (4.6mmID*35mm) Eluent : (A); 20mM MES* buffer(pH5.6) (B); (A) + 0.5M Na2SO4 Linear gradient: 0min to 30min, 5% (B) to 100% (B) Flow rate : 1.5mL/min Detector : VIS(415nm) Column temp. : Room temp.*MES : 2-(N-Morpholino) ethanesulfonic acid