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Characterization and release kinetics of liposomes inserted by pH-responsive bola-polymer

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Abstract

One important thing in tumor chemotherapy is to develop the targeting, precise timing, and quantitative drug delivery/release system. According to the weak acid of tumor extracellular environment, a pH-sensitive bola-type triblock copolymer (PEG m -PDPA n -PEG m ) was synthesized and mixed with phospholipid to form functional hybrid liposomes (liposome@Bola). When compared to pure liposome, the stability of the liposome@Bola was enhanced greatly and the drug leakage was inhibited at pH 7.4. However, under pH 6.0, the drug released quickly through the nanopores on the lipid bilayer created by the escape of copolymers. Under a strongly acidic environment, the drug release of liposome@Bola could be blocked again due to the coverage of free copolymers. The kinetic curves of drug release had been modeled by using some frequently used models. It was found that the release of liposome@Bola under pH 6.0 was biphasic with a slow release by means of membrane permeation and a rapid second phase which was released through nanopores on liposome membrane. The results indicated that the pH-responsive liposome@Bola could be expected to be a good potential in controllable drug delivery system.

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Acknowledgments

Financial support for this work is provided by the National Natural Science Foundation of China (no. 21276074), the 111 Project of China (no. B08021), and the Fundamental Research Funds for the Centre Universities of China.

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Authors and Affiliations

  1. Key Laboratory for Advanced Materials and Department of Chemistry, East China University of Science and Technology, Shanghai, 200237, China

    Weiju Hao, Tian Xia, Yazhuo Shang, Shouhong Xu & Honglai Liu

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  1. Weiju Hao
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  2. Tian Xia
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  3. Yazhuo Shang
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  4. Shouhong Xu
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  5. Honglai Liu
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Correspondence to Shouhong Xu.

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Hao, W., Xia, T., Shang, Y. et al. Characterization and release kinetics of liposomes inserted by pH-responsive bola-polymer. Colloid Polym Sci 294, 1107–1116 (2016). https://doi.org/10.1007/s00396-016-3871-1

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  • DOI: https://doi.org/10.1007/s00396-016-3871-1

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