Pasting properties modeling and comparative analysis of starch exposed to ionizing radiation

摘要

The paper presents a comparative analysis and the modeling of the behavior of the viscosities associated with the pasting profile of starches subjected to ionizing radiation processing in the range of 0-20 kGy. The study was performed using both experimental data reported in literature over the last decade and the authors' experimental data. Thus, a mathematical model describing the exponential decrease of the viscosities as the increasing of irradiation dose was proposed. As a result, the values of irradiation dose specific to each starch for each viscosity of pasting profile were determined. These specific irradiation doses are strongly related to the starch sensitivity to irradiation, being influenced by the native starch characteristics (moisture, content, amylose proportion, relative crystallinity and crystallographic pattern). The verification of the model was performed by new experiments of electron beam irradiation on maize starch with irradiation doses up to 20 kGy at a dose rate of 2 kGy/min. Also, an algorithm for the practical use of the developed model and the specific irradiation dose was described.