#$%^&*AU2013205432A120130523.pdf#####A METHOD FOR IMPROVING THE PHARMACEUTICAL PROPERTIES OF MICROPARTICLES COMPRISING DIKETOPIPERAZINE AND AN ACTIVE AGENT Abstract r 45 301,/3 0.4 (13 0.6 0.7 0A8 0.9 1.1)L Atomization Ilr* sstire (bair) Methods are provided for drying a particle. Specifically, there is provided a spray-dried diketopiperazine-insulin particle formulation having improved aerodynamic performance and in which the active agent is more stable and efficiently delivered as compared to that of the lyophilized diketopiperazine-insulin formulation. The dry powders have utility as pharmaceutical formulations for pulmonary delivery,