Rapid Method of Brabender Viscograph and its Application to Analysis of a Large Number of Samples

It is possible to establish a rapid method of Brabender viscography by reducing the reaction time for gelatinization. A rapid method was examined by increasing the heating and cooling speed of the suspension and evaluated by the application to a large number of samples for its practical use. (1) Increase of heating and cooling speed to 3°C/min in the rapid method reduced the measuring time of the existing method by half to 47 minutes and made possible to analyze 8 samples a day. (2) Reproducibility in standard deviation of the rapid method was 7.6 BU which was more accurate than the existing method. High significant correlation between the two methods was observed for each parameter. (3) Each method needs to be performed independently due to the large difference in the analytical data in several parameters between the two methods. (4) The correlations between the viscosity parameters are often different among the rice species. Therefore, every viscosity parameter in the cooled condition is required to be directly analyzed for its evaluation. From these data, it was indicated that the rapid method can be used for the evaluation of the viscosity characteristics of a large number of samples with adequate accuracy using existing Brabender viscographs.