| abstract |
(57) [Summary]nA method for preparing an ultrafine powder of a biopolymer comprises atomizing a liquid solution of the polymer, drying the droplets formed in the atomization step, and collecting particles resulting from the drying. . By precisely controlling each of the atomization, drying and collection steps, an ultrafine dry powder composition having properties particularly suitable for pulmonary delivery for therapeutic and other purposes can be prepared. |