Structural, Pasting, and Thermal Properties of Ultra-high Pressure-treated Lotus Seed Starch

Lotus seed starch (15%, w/w) was subjected to ultra-high pressure (UHP) at 500 MPa for 10 similar to 60 min. The effects of UHP on the structural, pasting, and thermal properties of starch were investigated using solid-state C-13 CP/MAS NMR, differential scanning calorimetry (DSC), HPSEC-MALLS-RI, and a rapid visco analyzer. The C-13 CP/MAS NMR results revealed a reduction in the relative crystallinity and peak intensity of the crystalline state with increasing the UHP time. The molecular weight of native starch was 1.433 x 10(7) Da, which was higher than that of the UHP-treated starch. Viscograms of UT-treated starch revealed an increase in paste viscosity, peak time, and pasting temperature and a reduction in breakdown and setback viscosity compared to the native starch. Furthermore, the DSC results showed a reduction in gelatinization temperature and gelatinization enthalpy with increasing the UHP time.