Provided are a polycaprolactone-polyphosphate block copolymer, a liquid composite formed by the block copolymer, a nucleic acid preparation, preparation methods for the copolymer and the liquid composite, and the use of the copolymer and the liquid composite in a nucleic acid medicine delivery system. The block copolymer prepared using the present invention has good biocompatibility, low cytotoxicity, and good biodegradability. The micelles provided in the present invention self-assemble into nano-particles in an aqueous solution, and have good stability, biocompatibility, and biodegradability, and low cytotoxicity. The preparation method is simple, has high repeatability, as a vector can protect small nucleic acids such as siRNA from biodegradation, can combine with the scale effect of nano-particles, and can be used for treating different diseases. Additionally, bonding targeting groups enable specificity recognition of different cancer cells.
                            提供了一种聚
己内酯-聚
磷酸酯嵌段共聚物,由该嵌段共聚物形成的液体复合物,核酸制剂,以及该共聚物和液体复合物在核酸药物传递系统中的使用。利用本发明制备的嵌段共聚物具有良好的
生物相容性,低细胞毒性和良好的
生物降解性。本发明提供的胶束在
水溶液中自组装成纳米粒子,并具有良好的稳定性,
生物相容性,
生物降解性和低细胞毒性。该制备方法简单,具有高重复性,作为载体可以保护小核酸如siRNA免受
生物降解,可以与纳米粒子的规模效应结合,并可用于治疗不同疾病。此外,结合靶向基团使得能够特异识别不同癌细胞。