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pH-responsive Micelles from a Blend of PEG-b-PLA and PLA-b-PDPA Block Copolymers: Core Protection Against Enzymatic Degradation

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Abstract

pH-responsive micelles with a biodegradable PLA core and a mixed PEG/PDPA shell were prepared by self-assembly of poly(ethylene glycol)-b-poly(lactic acid) (PEG-b-PLA) and poly(2-(diisopropylamino)ethyl methacrylate)-b-poly(lactic acid) (PDPA-b-PLA). The micellization status with different pH and the enzyme degradation behavior were characterized by 1H-NMR spectroscopy, dynamic light scattering measurement and zeta potential test. The pH turning point of PDPA block was determined to be in the range of 5.5−7.0. While the pH was above 7.0, the PDPA block collapsed onto the PLA core and could protect the PLA core from invasion of enzyme, as a result, the micelle exhibited a resistance to the enzymatic degradation.

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Acknowledgments

The financial supports by the National Natural Science Foundation of China (Nos. 21404082 and 51503104), the State Key Laboratory of Medicinal Chemical Biology of China (No. 201603001) and Natural Science Foundation of Tian** (Nos. 15JCQNJC05900, 15JCQNJC13400 and 16JCQNJC03000) are gratefully acknowledged.

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Authors and Affiliations

  1. State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tian**, 300071, China

    Yan-Ling Xu, Ao-Ting Qu, Ru-Jiang Ma, Ang Li, Zhen-Kun Zhang, Yao-Fang Zhang & Ying-Li An

  2. College of Basic Science, Chemistry Experiment Teaching Center, Tian** Agricultural University, Tian**, 300384, China

    Yan-Ling Xu, Zhi-Qiang Shang, Yao-Fang Zhang & Lu-**a Bu

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  1. Yan-Ling Xu
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Correspondence to Ying-Li An.

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Xu, YL., Qu, AT., Ma, RJ. et al. pH-responsive Micelles from a Blend of PEG-b-PLA and PLA-b-PDPA Block Copolymers: Core Protection Against Enzymatic Degradation. Chin J Polym Sci 36, 1262–1268 (2018). https://doi.org/10.1007/s10118-018-2149-0

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  • DOI: https://doi.org/10.1007/s10118-018-2149-0

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