Radical Formation in the Mixed Powders of Starch and Silicates

Abstract

Free radicals were found on the surface of potato starch particles when in contact with some kinds of silicates and silicas. Similarly, radical formation also occurs when the potato starch alone is heated. The reaction mechanism of this radical formation of the mixture may be caused by the heat arising from immersional wetting of additives in the surface water of potato starch particles, or some kinds of chemical reactions on the surface. The maximum amount of radicals formed was 1.1-3.0×10¹⁵ spins/g at the proportion of 0.5-1.0% of additives. Finally, the relationship between radical formation and fluidity is discussed.