Summary
1. Studies are reported on attempts to separate antihemophilic factor (AHF) from fibrinogen
in plasma by selective adsorption with fuller’s earth, aluminum hydroxide gel, and
Seitz filtration.
2. Fuller’s earth adsorption of canine plasma resulted in almost complete removal
of fibrinogen without loss of AHF. By the use of this procedure as part of the fractionation
procedure, potent AHF fractions free of fibrinogen have been obtained.
3. Al(OH)3 adsorption of fibrinogen from bovine, canine, and human plasmas is greater than the
adsorption of AHF. Al(OH)3 adsorption offers promise for the preparation of fibrinogen-poor AHF fractions of
human or bovine plasma.
4. Seitz filtration of plasma causes loss of AHF with little or no loss of fibrinogen.