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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

662
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
662
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Non-contact, Label-free Monitoring of Cells and Extracellular Matrix using Raman Spectroscopy
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Mapping Bone Surface Composition Using Real-Time Surface Tracked Micro-Raman Spectroscopy.

Furqan A Shah1, Krisztina Ruscsák2, Anders Palmquist2

  • 1Department of Biomaterials, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden, furqan.ali.shah@biomaterials.gu.se.

Cells, Tissues, Organs
|February 4, 2021
PubMed
Summary

This study introduces a new micro-Raman spectroscopy method for analyzing irregular bone surfaces. The technique uses real-time focus-tracking to map bone composition non-destructively, overcoming limitations of traditional methods.

Keywords:
BiomineralizationBoneBone surfaceRaman spectroscopy

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Area of Science:

  • Biomaterials Science
  • Chemical Analysis
  • Skeletal Biology

Background:

  • Bone surface characteristics offer insights into bone formation and repair.
  • Scanning electron microscopy provides morphological data but limited chemical information.
  • Micro-Raman spectroscopy enables non-destructive chemical analysis of bone, but signal loss occurs on non-planar surfaces.

Purpose of the Study:

  • To develop a novel micro-Raman spectroscopy technique for mapping the chemical composition of irregular bone surfaces.
  • To overcome signal integrity issues encountered with conventional Raman imaging on non-planar bone samples.
  • To enable detailed analysis of bone constituents and microstructures at the surface.

Main Methods:

  • Implemented real-time focus-tracking using laser focus optimization via closed-loop feedback.
  • Scanned deproteinized and decellularized/defatted sheep tibial cortical bone surfaces.
  • Achieved micrometer and submicrometer resolution mapping over regions up to 1 mm² despite significant surface topography.

Main Results:

  • Demonstrated successful mapping of bone surface composition despite surface height deviations exceeding 100 μm.
  • Showcased the ability to probe local gradients in organic and inorganic constituents.
  • Identified markers of bone metabolism, turnover, blood vessels, osteocyte lacunae, and mineralized bundles.

Conclusions:

  • The developed focus-tracking micro-Raman spectroscopy technique effectively maps the chemical composition of non-planar bone surfaces.
  • This method overcomes limitations of conventional Raman imaging, allowing detailed analysis of native bone topology.
  • Provides a powerful tool for understanding bone quality, metabolism, and microstructural features non-destructively.