Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (12): 2822.doi: 10.7503/cjcu20200378

• Polymer Chemistry • Previous Articles     Next Articles

Preparation and Drug Delivery Properties of Thermo/pH Dual Responsive Copolymer Composite Micelles of MPEG-b-PCL/PNVCL-b-PCL

ZHANG Meng, WANG Shaosen, XIN Yuhao, LIU Xue, WU Qiuhua(), ZHANG Guolin()   

  1. College of Chemistry,Liaoning University,Shenyang 110036,China
  • Received:2020-06-22 Online:2020-12-10 Published:2020-12-09
  • Contact: WU Qiuhua,ZHANG Guolin E-mail:wuqiuhua@lnu.edu.cn;glzhang@lnu.edu.cn
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(51373073);the Natural Science Foundation of Liaoning Province of China(2019?ZD?0192)

Abstract:

Thermo/pH dual responsive copolymer composite micelles(CMs) based on the block copolymers with imine bonds show higher sensitivity and stability due to their imine linkage and core-shell-crown three la-yer structure. Using polyethylene glycol monomethyl ether(MPEG), N-vinyl caprolactam(NVCL) and ε-caprolactone(ε-CL) as raw materials, the aldehyde-terminated poly(ethylene glycol) monomethyl ether(MPEG-CHO), aldehyde-terminated poly(N-vinylcaprolactam)(PNVCL-CHO) and amino-terminated polycaprolactone(H2N-PCL) were prepared respectively. Block copolymers, poly(ethylene glycol) monomethyl ether-b-poly(ε-caprolactone)(MPEG-b-PCL) and poly(N-vinylcaprolactam)-b-poly(ε-caprolactone) (PNVCL-b-PCL) based on imine bond, were synthesized by reaction of H2N-PCL with MPEG-CHO and PNVCL-CHO. At room temperature, MPEG-b-PCL and PNVCL-b-PCL self-assembled to form CMs with PCL as the core and MPEG/PNVCL as the mixed shell in water. At the physiological temperature, thermo-responsive PNVCL collapsed on the PCL core, while MPEG still stretched to form core-shell-corona micelles, which might protect the drug encapsulated in the core. Studies on the in vitro drug release showed that a much faster release rate was observed at slightly acidic media, due to the disruption of imine bonds. 3-(4,5)-Dimethylthiahiazo(-z-y1)-3,5-di-phenytetrazoliumromide(MTT) assay demonstrated the low cytotoxicity of the composite micelles.

Key words: Temperature/pH response, Imine bond, Copolymer composite micelle, Drug loading

CLC Number: 

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