Surface state modifications in powder products induced by a spray-coating technique

摘要

The characterization of the surface state of powder products, such as theophylline, microencapsulated by a spray-coating technique was achieved. In this approach were also covered such areas as surface topography, surface chemistry, or reactivity problems dealt with in terms of matter transfer or adhesion. The study was carried out through galenic applications based on the controlled release techniques of encapsulated products.