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Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy

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Published on: December 1, 2023

Mapping molecular orientation with phase sensitive vibrationally resonant sum-frequency generation microscopy.

Yang Han¹, Varun Raghunathan, Ran-ran Feng

¹Department of Chemistry, University of California at Irvine, Irvine, California 92697-2025, United States.

The Journal of Physical Chemistry. B

|May 17, 2013

Summary

We developed a new microscope for high-resolution imaging of collagen fibers. This technique reveals fibrous collagen microdomains with opposite orientations, impacting tissue mechanics understanding.

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Area of Science:

Biophysics
Materials Science
Microscopy

Background:

Collagen I is a crucial structural protein in connective tissues like tendons.
Understanding collagen organization at the microscale is vital for tissue mechanics.
Existing imaging techniques may lack the required resolution, speed, or chemical specificity.

Purpose of the Study:

To develop and demonstrate a novel phase-sensitive, vibrationally resonant sum-frequency generation (PSVR-SFG) microscope.
To investigate the microscale organization and phase properties of collagen I fibers in native tissue.

Main Methods:

Utilized a phase-sensitive, vibrationally resonant sum-frequency generation (PSVR-SFG) microscope.
Acquired amplitude and phase images of the second-order susceptibility of collagen I fibers.
Performed imaging on rat tail tendon tissue, specifically targeting methylene vibrations.

Main Results:

Achieved high resolution, fast image acquisition, chemical selectivity, and phase sensitivity.
Generated detailed amplitude and phase images of collagen I fibers.
Observed that the phase of the second-order susceptibility correlates with the effective polarity of fibril bundles.
Identified fibrous collagen domains with opposite orientations within the tendon tissue.

Conclusions:

The PSVR-SFG microscope is a powerful tool for visualizing nanoscale molecular organization.
The detected collagen microdomains with varying orientations may influence tendon mechanical properties.
Further research into these microdomains could refine our understanding of connective tissue biomechanics.