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Tracking Molecular Diffusion across Biomaterials' Interfaces Using Stimulated Raman Scattering.

Han Cui1,2, Andrew Glidle2, Jonathan M Cooper2

  • 1Beijing Key Lab for Precision Optoelectronic Measurement Instrument and Technology, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China.

ACS Applied Materials & Interfaces
|July 8, 2022
PubMed
Summary
This summary is machine-generated.

Stimulated Raman scattering quantifies molecular diffusion in tissues, overcoming fluorescence interference. While hydrogels show simple diffusion, biological tissues exhibit more complex transport mechanisms.

Keywords:
biomaterial interfacesdiffusionhydrogelsspectroscopystimulated Raman scatteringtissue

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Area of Science:

  • Biomaterials science
  • Chemical physics
  • Biomedical engineering

Background:

  • Understanding molecular diffusion across biomaterial interfaces is crucial for drug delivery.
  • Spontaneous Raman spectroscopy for diffusion measurement suffers from weak signals and fluorescence interference.
  • Soft tissue diffusion analysis requires advanced spectroscopic techniques.

Purpose of the Study:

  • To demonstrate stimulated Raman scattering (SRS) for quantifying molecular diffusion in soft tissues.
  • To overcome limitations of spontaneous Raman spectroscopy, such as low signal-to-noise ratio and fluorescence interference.
  • To compare molecular transport mechanisms in hydrogels versus biological tissues.

Main Methods:

  • Utilized stimulated Raman scattering (SRS) spectroscopy.
  • Employed deuterated (d7-) glucose as a model metabolite/drug molecule.
  • Monitored the C-D Raman band, a region free from interfering signals.
  • Analyzed diffusion in both hydrogel matrices and soft tissue samples.

Main Results:

  • SRS provided high signal-to-noise ratio measurements in soft tissues, free from fluorescence.
  • Deuterated glucose diffusion was successfully monitored in the C-D band.
  • Mass transport in hydrogels adhered to Fick's laws of diffusion.
  • Molecular transport in soft tissues demonstrated more complex mechanisms than simple diffusion.

Conclusions:

  • Stimulated Raman scattering is a powerful technique for measuring molecular diffusion in biological tissues.
  • SRS overcomes the limitations of spontaneous Raman spectroscopy for in-situ diffusion studies.
  • Biological tissues exhibit complex molecular transport mechanisms that deviate from simple Fickian diffusion observed in hydrogels.