Effects of pulsed electric field treatments on some properties of tapioca starch

► Higher energy input (>49.36Jg−1) offered by pulsed electric field could destroy the crystal region of tapioca starch. ► The gelatinization temperature, enthalpy, the peak viscosity and the breakdown viscosity of PEF-treated samples were all decreased. ► PEF treatments would be a promising physical method to modify properties of starch and get desired products in food industry. Tapioca starch-water dispersions (8.0%, w/w) were subject to pulsed electric fields (PEF) at 30, 40 and 50kVcm−1, respectively. The effect of the intense energy input (Q) of PEF treatment (over 28.85Jg−1) on the functionality of tapioca starch was investigated. Scanning electron microscopy analysis revealed the dissociation and damage of PEF treated tapioca starch granules. X-ray diffraction analysis demonstrated that tapioca starch tended to transform from crystalline to amorphous structure after PEF treatments. It was found that higher energy input (>49.36Jg−1) could destroy the crystal region of tapioca starch. Meanwhile, with increasing electric field strengths, the gelatinization temperature, the gelatinization enthalpy, the peak viscosity and the breakdown viscosity of PEF-treated samples showed a remarkable decrease. These results suggest that PEF treatments would be a promising physical method to modify the properties of starch in order to obtain desired products in food industry.