NOTION OF GLASS-TRANSITION APPLIED TO THE SPRAY-DRYING OF CARBOHYDRATE SOLUTIONS

In order to specify the relationship between the glass transition and the deposits observed during spray-drying of carbohydrate solutions, m easurements of glass transition temperatures (T-g) are made on pure su gars or mixtures of sugars and starch hydrolysis products with a diffe rential scanning calorimetry technique, whereas the stickiness is eval uated through spray-drying trials performed in a pilot tower. The resu lts show the influence of dextrose-equivalent and of molecular mass on T-g, and the significant role of T-g on the deposits occuring during spray-drying.