PREPARATION OF AMPHOTERIC STARCHES DURING AQUEOUS ALCOHOLIC CATIONIZATION

Use of an aqueous alcoholic-alkaline solvent allowed cationization and phosphorylation to be combined in simultaneous or sequential processe s in the production of amphoteric starch. Degrees of substitution requ ired by the paper industry were obtained in normal corn, pea and barle y starches, and in waxy corn and barley starches without the need for drying and heating the cationic starches to complete the phosphorylati on reaction. The amphoteric starches had increased swelling power, low er gelatinization temperatures, improved paste consistency and stabili ty, and increased alpha-amylase digestibility than native controls, wh ile gel syneresis after cold storage was eliminated.