Rheological properties of potato starch pastes treated by 60Co-γ radiation

In order to study the effects of γ-ray radiation on rheological properties of starch paste, potato starches were treated by 60Co-γ irradiation with different irradiation dose（0–400 kGy）and their pastes were prepared. By adopting rheometer, the rheological properties of the pastes of potato starch after treated with different irradiation dose were investigated. The static rheological properties investigation revealed that the pastes of potato starches after treated with different irradiation dose showed a phenomenon of so-called pseudo-plastic fluid characteristics and this was consistent with power law. The higher the irradiation dose, the lower the apparent viscosity and share-thinning nature, and it gradually performed similar like Newtonian fluids. The determination of dynamic rheological properties indicated that the elastic modulus, the maximum elastic modulus, the temperature in correspondence to the maximum elastic modulus and the elastic modulus at 20℃ decreased with the increase of irradiation dose. The research results will provide theoretical data for application of potato starch treated by 60Co-γ irradiation.