With dry powder inhalers, the flow properties of the formulation influence both ease of manufacture and the aerosolization process needed for drug delivery. To achieve effective delivery, lactose is often used as a carrier for the very fine active pharmaceutical ingredients in inhaled formulations. One way to improve its flow properties is by applying a very thin magnesium stearate coating using mechanofusion. Using the FT4 to compare the influence on the powder behavior of this technique with a conventional blending approach, the Monash team showed mechanofusion to be much the more effective.
Specific energy, a dynamic property routinely reported by the FT4, proved especially sensitive to changes induced by the inclusion of magnesium stearate, successfully detecting the smaller improvements caused by simply mixing the additive with the lactose. The aim is now to use the FT4 to define parameters that enable the prediction of both in-process flow behavior and aerosolization.
The FT4 from Freeman Technology is a universal powder tester that delivers dynamic, shear, and bulk measurements that together combine to give the fullest insight into powder behavior. Well-defined analytical protocols, automation, and sample conditioning, prior to measurement, give the instrument exemplary reproducibility. High sensitivity and the process relevance of the parameters generated make the FT4 an excellent tool for process development, troubleshooting, QC, and development. For more information, visit www.freemantech.co.uk.