Amino Acid Additives Effects on Sweet Potato Starch Thermal Properties

Abstract

AbstractThis study assessed the effects of amino acid additives, aspartic acid, leucine, lysine, and methionine, on the thermal characteristics of white‐fleshed and orange‐fleshed Beauregard sweet potato starches. The orange‐fleshed sweet potato (OFSPS) starch began to gelatinize at a lower temperature (56.8°C) than the white‐fleshed sweet potato starch (WFSPS) (70.1°C), but the two starches needed the same amount of energy to gelatinize. Lysine increased the gelatinization temperature of the OFSPS. The addition of leucine, aspartic acid, and methionine had no apparent impact on the OFSPS. The addition of lysine or aspartic acid increased the gelatinization temperatures of the WFSPS. Overall, the two starches used were more affected by charged amino acids than by the neutral ones.