Effect of high pressure treatment on the structural and physicochemical properties of Cardiocrinum cathayanum starch.

In this study, Cardiocrinum cathayanum starch was treated with high pressure of 100 MPa, 400 MPa for 10 min, 20 min, respectively, the changes in structural and physicochemical properties were investigated. The results showed that the surface of starch granules became rougher after high pressure treatment. Also, significant variations in some starch quality parameters were generated by high pressure treatment. For instance, apparent amylose content increased from 36.02 % to 39.26 % after 100 MPa-10 min treatment. The hardness of starch gel was increased after treatment at 400 MPa, so did the peak viscosity, hot paste viscosity, cold paste viscosity, setback viscosity and consistency. In contrast, the relative crystallinity, onset, peak and conclusion temperature decreased after high pressure treatment. The particle size of starch became smaller after 100 MPa-20 min treatment. It is worth noting that the solubility and swelling power were changed to different extents. However, no significant changes were observed in break down viscosity, pasting temperature, adhesiveness, cohesiveness, and enthalpy of gelatinization. The results indicated that high pressure treatment has a significant and complex effect on starch characteristics. The present study provides useful information for the modification of C. cathayanum starch, which can expand its application.