Lipase-Catalyzed Selective Synthesis and Micellization of Poly(ethylene glycol)-block-poly(ε-caprolactone) Copolymer Possessing a Carboxylic Acid Group at the PEG Chain End

Abstract

A novel poly(ethylene glycol)-block-poly(ε-caprolactone) (PEG-b-PCL) copolymer possessing a carboxylic acid group at the PEG chain end was prepared by the one-pot lipase-catalyzed polymerization of ε-CL using an α-carboxylic acid-ω-hydroxy-PEG as a macroinitiator. This synthetic approach is remarkable because it dose not require tedious chemical routes such as end-functional group changing steps and protection-deprotection steps. The PEG-b-PCL copolymer spontaneously forms a polymeric micelle with a size of 35.3 nm and a narrow polydispersity index (μ22=0.15) in aqueous media. Furthermore, the PEG-b-PCL micelles had a negative zeta potential due to the existence of the reactive carboxylic acid groups on the surface of the PEG-b-PCL micelles, indicating that the carboxylic acid end-functionalized PEG-b-PCL copolymer was successfully prepared. Therefore, this reactive PEG-b-PCL micelle may have potential uses in the field of drug delivery systems as a targetable drug carrier.

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Correspondence to Yukio Nagasaki.

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Oishi, M., Ikeo, S. & Nagasaki, Y. Lipase-Catalyzed Selective Synthesis and Micellization of Poly(ethylene glycol)-block-poly(ε-caprolactone) Copolymer Possessing a Carboxylic Acid Group at the PEG Chain End. Polym J 39, 239–244 (2007). https://doi.org/10.1295/polymj.PJ2006172

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Keywords

  • Lipase
  • Poly(ethylene glycol)-poly(ε-caprolactone) Block Copolymer
  • End-Functionalization
  • Reactive Polymeric Micelle
  • Drug Delivery System

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