Decomposition of starch grains in water dispersion and destruction of starch macromolecules in water solutions at acoustic cavitation has been investigated. Kinetics of this process is described by the first order process. Based on experimental data the rate constants have been found. Mathematical model based on found equations and experimental rate constants allows describing the kinetics of starch grains and starch macromolecules destruction in water as well as the change of relative viscosity of starch solution under ultrasonic treatment.
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