样本中100毫克庆大霉素浓度1毫升PBS (67 mM, pH 7.4 or 6.0), dispersed in 20 g of a 5% (w/w) polymer solution in ethyl formate by ultrasonication under cooling on ice Solvent Water, Ethylformate, PBS Carrier, Filmogen Poly(D,L-lactide-co-glycolide) PLGA 50:50 and PLGA 50:50H, Esterified PLGA (50:50)