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Polyethyleneimine assisted-two-step polymerization to develop surface imprinted cryogels for lysozyme purification.

Kadir Erol1, Kazım Köse2, Lokman Uzun3

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Summary

This study developed novel surface-imprinted cryogels using polyethyleneimine (PEI) for efficient lysozyme capture. The plastic antibodies demonstrate high selectivity and adsorption capacity, paving the way for protein purification applications.

Keywords:
CryogelLysozymePolyethyleneimineSurface imprintingTwo-step polymerization

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Affinity Chromatography

Background:

  • Protein imprinting faces challenges, but surface imprinting offers a promising alternative.
  • Polyethyleneimine (PEI) assisted coordination is explored for template molecule imprinting.

Purpose of the Study:

  • To develop a two-step polymerization strategy for surface imprinting lysozyme using PEI-modified cryogels.
  • To characterize the imprinted materials and optimize lysozyme adsorption conditions.

Main Methods:

  • Synthesis of poly(HEMA-GMA) cryogels and subsequent PEI immobilization.
  • Functionalization with methacrylate groups and Cu(II) chelation for template binding.
  • Characterization using FTIR, SEM, and μCT; optimization of adsorption parameters (pH, time, concentration, temperature, ionic strength).
  • Selectivity assessment against cytochrome c and BSA; Langmuir isotherm modeling.

Main Results:

  • Successful synthesis and characterization of PEI-modified cryogels.
  • Optimized conditions for lysozyme adsorption from aqueous solutions.
  • Demonstrated high selectivity for lysozyme over competing proteins.
  • Adsorption process accurately described by the Langmuir isotherm model.

Conclusions:

  • The developed surface-imprinted cryogels show significant potential for selective lysozyme purification.
  • The PEI-assisted coordination strategy is effective for creating plastic antibodies.
  • The Langmuir isotherm model provides a good fit for the adsorption data, indicating monolayer adsorption.