A series of poly(ethylene glycol)-poly(dl-lactide) (PEG-PLA) block copolymers with varying molecular weights were synthesized. Drug-loaded micelles were prepared using amphotericin B (AmB) as the model drug. The PEG-PLA copolymers were freeze-dried to obtain long-term stable formulations. Saccharides at various concentrations including mannose, trehalose and glucose, Pluronic F68 and PEG were used as lyoprotectants, respectively. The protective effects of the various types of lyoprotectants on the particle ...