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Updated: Jul 14, 2025

Imaging Amyloid Tissues Stained with Luminescent Conjugated Oligothiophenes by Hyperspectral Confocal Microscopy and Fluorescence Lifetime Imaging
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Structural Colors from Amyloid-Based Liquid Crystals.

Tonghui Jin1, Ye Yuan1, Massimo Bagnani1

  • 1Department of Health Sciences and Technology, ETH Zürich, Zürich, 8092, Switzerland.

Advanced Materials (Deerfield Beach, Fla.)
|October 7, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed novel iridescent films using amyloid cholesteric liquid crystals (CLCs). These protein-based CLCs reflect specific colors, offering a new route for creating structural color materials.

Keywords:
amyloid fibrilschiralcholesteric liquid crystalsphotonic bandgapstructural color

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Area of Science:

  • Materials Science
  • Biophysics
  • Optics

Background:

  • Cholesteric liquid crystals (CLCs) exhibit helical structures that diffract light, producing structural color.
  • Natural materials like DNA and cellulose often form left-handed CLCs with specific color properties.
  • Amyloid fibrils, known for their self-assembly, offer a potential new source for CLC materials.

Purpose of the Study:

  • To explore the use of amyloid fibrils in creating right-handed cholesteric liquid crystal films.
  • To investigate the generation of structural color from these novel protein-based CLCs.
  • To control the optical properties and color reflection of amyloid CLC films.

Main Methods:

  • Self-assembly of left-handed amyloid fibrils into right-handed CLC structures.
  • Drying of amyloid CLC films with controlled pitch using glucose concentration.
  • Characterization of structural color and optical properties using Bragg's law and optical rotatory dispersion.

Main Results:

  • Formation of right-handed amyloid CLCs from left-handed fibrils.
  • Tunable iridescent color reflection based on helical pitch, controlled by glucose.
  • Demonstration of color switching between gradients and uniform large areas by varying drying speed.
  • Confirmation of structural color origin from layered CLC structures, with negligible birefringence.

Conclusions:

  • Amyloid CLCs provide a facile method for creating biosourced cholesteric materials.
  • This study introduces a new class of proteinaceous materials for generating structural color.
  • The developed films reflect circularly polarized light with the same handedness as the CLC helix.