Abstract
Ferritin and hemosiderin in diluted tissue cannot be quantitatively separated by centrifugation unless the pH is brought below 6. Tnese Fe-storage substances can be separated from one another and from hemoglobin by ion-exchange chromatography on CM-cellulose, when good recoveries of total tissue iron are obtained. The ferritin fraction has been identified by its solubility, its appearance under the electron microscope, crystallization with Cd2+ and the fact that it corresponds quantitatively to the heat-stable portion of the tissue non-hem Fe.