Methods: (1) With the PLGA as matrix and ultrasound emulsification and dissolvent volatilization, PLGA nano-encapsuled BDP of nanoparticals(NP) were prepared.

• 方法：(1)采用超声乳化法和去溶剂固化法，以聚乳酸-聚羟乙酸共聚物(PLGA)为基质，制备BDP纳米微囊；