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Preparation, characterization and in vitro release properties of morphine-loaded PLLA-PEG-PLLA microparticles via solution enhanced dispersion by supercritical fluids

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Abstract

Morphine-loaded poly(l-lactide)-poly(ethylene glycol)-poly(l-lactide) (PLLA-PEG-PLLA) microparticles were prepared using solution enhanced dispersion by supercritical CO2 (SEDS). The effects of process variables on the morphology, particles size, drug loading (DL), encapsulation efficiency and release properties of the microparticles were investigated. All particles showed spherical or ellipsoidal shape with the mean diameter of 2.04–5.73 μm. The highest DL of 17.92 % was obtained when the dosage ratio of morphine to PLLA-PEG-PLLA reached 1:5, and the encapsulation efficiency can be as high as 87.31 % under appropriate conditions. Morphine-loaded PLLA-PEG-PLLA microparticles displayed short-term release with burst release followed by sustained release within days or long-term release lasted for weeks. The degradation test of the particles showed that the degradation rate of PLLA-PEG-PLLA microparticles was faster than that of PLLA microparticles. The results collectively suggest that PLLA-PEG-PLLA can be a promising candidate polymer for the controlled release system.

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Acknowledgments

This work has been supported by the National Natural Science Foundation of China (project No. 51173120, 51273122 and 51202151). Authors are very much grateful to the National Engineering Research Center for Biomaterials, Sichuan University for the assistance with the microscopy work.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Sichuan University, No.24, South 1st Section, 1st Ring Road, Chengdu, 610065, Sichuan, People’s Republic of China

    Fu Chen, Guangfu Yin, Xiaoming Liao, Yi Yang, Zhongbing Huang, Yadong Yao, Xianchun Chen & Hu Gao

  2. Chengdu Military General Hospital, Tianhui Town, Chengdu, People’s Republic of China

    Jianwen Gu

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  1. Fu Chen
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Correspondence to Xiaoming Liao or Jianwen Gu.

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Chen, F., Yin, G., Liao, X. et al. Preparation, characterization and in vitro release properties of morphine-loaded PLLA-PEG-PLLA microparticles via solution enhanced dispersion by supercritical fluids. J Mater Sci: Mater Med 24, 1693–1705 (2013). https://doi.org/10.1007/s10856-013-4926-1

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