Tsuyoshi Takahashi

Studies on Soluble Ferrous Pyrophosphate Powder

When the colloidal ferrous pyrophosphate is separated from the mother liquor and dried up, the final product loses its colloidal quality, a greater part of iron contained being oxidized to ferric iron. By spray-drying of the colloidal ferrous pyrophosphate in starch hydrolyzate solution, slightly greenish powder is obtained. Both the forming condition of the colloidal ferrous pyrophosphate, and the stability of that powder, were investigated by (1) determination of ferrous iron content, (2) determination of total iron content, (3) reaction to tannic acid, (4) reaction to sodium sulfide, and so on. From the results it became clear that the powder possessed an excellent property for iron enrichment of foods.