Abstract
Ferric pyrophosphate is a reaction product from ferric and pyrophosphate ions. At the reaction equivalent point, ferric pyrophosphate is colloidal and the soluble iron content is minimum. Ferric pyrophosphate, thus freshly prepared, is soluble to some extent in dilute hydrochloric acid or aqueous dilute solution of disodium phosphate. But a reagent grade ferric pyrophosphate powder is insoluble both to dilute acid or alkali, and it does not suspend in water for the lack of its colloidal quality. Therefore, it is considered that a reagent grade ferric pyrophosphate powder is inappropriate for iron enrichment of foods.
By spray-drying of colloidal ferric pyrophosphate in whole milk concentrate, skimmilk concentrate or starch hydrolysate solution, non-precipitated colloidal ferric pyrophosphate powder preparations were obtained.
The application of these preparations was carried out for the iron enrichment of modified milk powder and baby food. It was confirmed that these preparations affected little on the appearance, taste, keeping quality and other properties of these foods.
