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Design of Cysteine Functional Polyesters through Michael Addition.

Marta Chrószcz-Porębska1, Sylwia Waśkiewicz2, Tomasz Gołofit1

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Amino acids like L-cysteine modified polymaleates and polyfumarates for biomedical uses. Polymaleates showed better properties and solubility, suggesting potential as modifiers for tissue engineering scaffolds.

Keywords:
Amino acid-polymer conjugatesL-cysteineLinear polyestersPost-polymerisation modificationThio–Michael addition

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Area of Science:

  • Polymer Chemistry
  • Biomedical Engineering
  • Materials Science

Background:

  • Amino acid modification of polymers is increasingly important for biomedical applications, including tissue engineering.
  • Linear polyesters of butenedioic acid, such as polymaleates and polyfumarates, are being explored for tailored properties.

Purpose of the Study:

  • To modify polymaleates and polyfumarates using L-cysteine (Cys) and N-acetyl-L-cysteine (NAC) via thio-Michael addition.
  • To evaluate the properties of the resulting amino acid-polymer adducts for potential biomedical applications.

Main Methods:

  • Thio-Michael addition reaction to covalently attach Cys and NAC to polymaleates and polyfumarates.
  • Nuclear Magnetic Resonance (NMR) and Fourier-Transform Infrared (FT-IR) spectroscopy to confirm amino acid attachment.
  • Analysis of thermal properties, solubility, and molecular weight of the modified polymers.

Main Results:

  • Covalent attachment of Cys and NAC was confirmed by NMR and FT-IR.
  • Polymaleates exhibited a higher degree of addition (AD) compared to polyfumarates, with near 100% AD using Cys.
  • Polymaleate adducts demonstrated favorable thermal stability (>200 °C), low glass transition temperature (<0 °C), and solubility in organic solvents, unlike polyfumarate adducts.

Conclusions:

  • Polymaleate adducts are more promising for biomedical applications due to superior solubility and thermal properties.
  • The low molecular weight of the synthesized polymers precludes their use as standalone tissue engineering scaffolds.
  • Polymaleate adducts may be suitable as modifiers for common scaffolds like polylactide or poly(ɛ-caprolactone) due to shared solvent solubility.