A method for separating and purifying the active hematinic species (AHS)
present in iron-saccharidic compositions, including AHS such as sodium
ferric gluconate complex, ferric hydroxide-sucrose complex and ferric
saccharate complex and others of similar form and function. The method
separates the AHS from one or more excipients and, preferably,
lyophilizes the separated AHS. Separation of the AHS permits its
analytical quantification, further concentration, purification and/or
lyophilization as well as preparation of new and useful products and
pharmaceutical compositions, including those useful for the treatment of
humans and animals.