Hydration and Pressure-Temperature Phase Diagrams of Wheat Starch

摘要

Wheat starch suspensions (5percent DM) were subjected to pressure (0.1 to 600 MPa) and/or temperature (-20 to 96 deg C) during 15 min. Swelling index (s.i.) depended on starch hydration as a function of pressure or temperature level. p-T treatment improved starch hydration for low and high temperatures at the same pressure level. p-T denaturing conditions were found using DSC and loss of birefringence by the granules. The p-T phase diagram of starch was found to correspond to a pseudo ellipsoid curve. A 3D phase diagram of starch was proposed including pressure, temperature and initial moisture content.