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Amyloids, Congo red and the apple-green effect.

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Amyloids complex with Congo red molecules, forming stable supramolecular structures. This self-assembly leads to significant UV and visible light absorbance changes, indicating electron delocalization in these amyloid-dye complexes.

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Area of Science:

  • Biochemistry
  • Materials Science
  • Spectroscopy

Background:

  • Amyloids are known to interact with Congo red dye.
  • The self-assembly properties of Congo red molecules are significant.
  • Understanding amyloid-dye interactions is crucial for diagnostics and therapeutics.

Purpose of the Study:

  • To investigate the complex formation between amyloids and Congo red molecules.
  • To provide evidence for the preservation of supramolecular organization in these complexes.
  • To analyze the spectral properties and their correlation with molecular self-assembly.

Main Methods:

  • Spectrophotometric analysis of Congo red solutions at varying concentrations.
  • Modeling amyloid fibrils using polyvinyl alcohol as a scaffold.
  • Observation of spectral shifts and absorbance changes under polarized light.

Main Results:

  • Increasing Congo red concentration leads to increased molecular acidity and nonlinear UV absorbance.
  • Polyvinyl alcohol scaffolds stabilize Congo red micelles, mimicking amyloid fibril structures.
  • Significant shifts in UV and visible absorbance bands were observed, linked to electron delocalization.

Conclusions:

  • Amyloid-Congo red complexes exhibit preserved supramolecular organization.
  • The self-assembly of Congo red is a key factor driving spectral changes.
  • Spectral variability in these complexes is associated with electron delocalization within the supramolecular structure.