Abstract
Bulk flow properties of five kinds of model food powders composed of starchy powder (potato starch) and proteinaceous powder (wheat protein) were determined at different water activity by measuring loose bulk density, tapped bulk density, Hausner ratio, angel of repose and slide and shear stress of the model powders. Fitted equations relating these bulk properties to water activity were also developed. As the water activity of model food powders increased, all the tested properties of the model powders increased except loose bulk density and internal friction angle. As the protein content of model food powder increased, Hausner ratio, angle of slide, shear stress, and cohesion increased, but loose bulk density decreased. There were no significant differences in angle of frictions among the tested model powders. If a powder with high protein content is exposed to a high humidity environment, the powder may aggregate due to the low flowability. The correlation coefficients (R) for all the fitted equations were greater than 0.98, indicating the high reliability of the fitted equations for predicting the individual bulk property at a given water activity.
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