Comparison of the Brabender Viskograph and the Rapid Visco Analyser .1. Statistical evaluation of the pasting profile

摘要

A statistical evaluation was made of the pasting profiles of starches registered with the Brabender Viskograph and the Rapid Visco Analyser (RVA). Fourteen sets of native and modified starches, with a total of 71 samples, were tested in both instruments at the same concentration. When starch samples with only slightly different pasting profiles were measured, e.g., in quality control, the Brabender Viskograph remains the first choice because of its better discriminating ability. For most of the modified starches, good correlations between both instruments were obtained for the viscosity data. When different concentrations were used in both instruments, which is common practice, correlation of viscosity data was poor for those sets, in which the order of viscosities varied as a function of concentration. Correlation of the temperature data was poor. In many cases, the Brabender analysis can be appreciably shortened because of the good correlation between peak and end viscosities.