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Glucose-specific poly(allylamine) hydrogels--a reassessment.

Furqan M Fazal1, David E Hansen

  • 1Department of Chemistry, Amherst College, Amherst, MA 01002, USA.

Bioorganic & Medicinal Chemistry Letters
|October 13, 2006
PubMed
Summary

This study found that polymer hydrogels made with poly(allylamine hydrochloride) do not exhibit molecular imprinting. Binding affinities for sugar derivatives were similar across all hydrogels, suggesting solubility, not imprinting, drives interactions.

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Area of Science:

  • Polymer Chemistry
  • Supramolecular Chemistry
  • Biomaterials Science

Background:

  • Molecular imprinting is a technique used to create selective recognition sites in polymers.
  • Poly(allylamine hydrochloride) hydrogels are synthesized using various crosslinking agents and templates.
  • Understanding the molecular recognition capabilities of novel hydrogel systems is crucial for applications in separation and sensing.

Purpose of the Study:

  • To investigate whether templating with different molecules leads to molecular imprinting in poly(allylamine hydrochloride) hydrogels.
  • To evaluate the binding selectivity of these hydrogels towards various sugar derivatives.
  • To determine the mechanism underlying the binding interactions observed in the hydrogels.

Main Methods:

  • Synthesis of poly(allylamine hydrochloride) hydrogels using (+/-)-epichlorohydrin with various templates (e.g., d-glucose-6-phosphate monobarium salt, d-glucose, l-glucose).
  • Batch binding studies were performed using d-glucose, l-glucose, d-fructose, and d-gluconamide as analytes.
  • Quantitative analysis of sugar binding using proton nuclear magnetic resonance ((1)H NMR) spectroscopy.

Main Results:

  • None of the synthesized hydrogels displayed molecular imprinting, even when using specific sugar-phosphate templates.
  • All hydrogels exhibited similar relative binding affinities for the tested sugar derivatives.
  • Binding affinities correlated with the octanol-water partition coefficients of the sugars, indicating solubility-driven interactions.

Conclusions:

  • Crosslinked poly(allylamine hydrochloride) hydrogels, unlike those based on methacrylate or acrylamide, do not achieve true molecular imprinting.
  • The observed binding of sugar derivatives is primarily governed by differential solubilities within the polymer matrix rather than specific molecular recognition.
  • This study highlights the limitations of poly(allylamine hydrochloride) for creating imprinted polymers with high selectivity for small molecules.