Column : Shodex IEC SP-420N (4.6mmID*35mm) Eluent : (A); 20mM MES* buffer(pH6.0) (B); (A) + 0.5M Na2SO4 Linear gradient: 0min to 15min, (A) to (B) Flow rate : 1.5mL/min Detector : UV(280nm) Column temp. : Room temp.*MES: 2-(N-Morpholino)-ethanesulfaonic acid