The degree of starch gelatinization needed to increase
HRY is, however, not clearly established. Using differential scanning
calorimetry, a degree of starch gelatinization of ca. 40% is
needed to obtain maximal HRY,whereas, based on amylose/iodine blue values after dispersion in alkali, Priestly (1976) claimed that complete gelatinization is required to improve milling breakage.