In a process for producing an iron-dextran compound for use in parenteral treatment of iron-deficiency in humans or animals a stable compound of desired relatively low molecular weight is obtained by using first hydrogenation and then oxidation to convert reducing terminal groups on the dextran molecules before reaction with the iron. First and second frame structures are defined by interconnected modular frame assemblies so as to have sufficient length to extend along the entire length of shelving. In addition, no damage is caused to the organic material layer during formation of the electrode, and the organic functional element is not affected by environmental changes.