OBJECTIVE:A new ionexchange chromatographic procedure has been developed to a highly purified factor VIII conc-entrate from plasma cryoprecipitate.METHODS:Solubilized cryoprecipitate,after adsorption on aluminium hydroxide,acid precipitation in low temperature and PEG precipiatation,was treated with 0.3% tri(nbutyl)phosphate and 1% Tween 80 at 25℃ for at least 8hour to inactivate lipidenveloped viruses.The fractions then loaded onto a column packed with DEAEFractogel TSK 650M and chromatographed.Most protei...