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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.
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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Pigmentation01:19

Pigmentation

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The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
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For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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Probing the Limits of Egg Recognition Using Egg Rejection Experiments Along Phenotypic Gradients
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Analysing avian eggshell pigments with Raman spectroscopy.

Daniel B Thomas1, Mark E Hauber2, Daniel Hanley3

  • 1Institute of Natural and Mathematical Sciences, Massey University, Auckland 0632, New Zealand d.b.thomas@massey.ac.nz.

The Journal of Experimental Biology
|June 27, 2015
PubMed
Summary

Raman spectroscopy accurately identifies eggshell pigments like biliverdin and protoporphyrin IX. This non-destructive technique analyzes avian eggshell coloration, even in extinct species.

Keywords:
BiliverdinChemical analysisMoaNon-destructiveProtoporphyrin IXTinamou

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Area of Science:

  • * Paleo-ornithology
  • * Biogeochemistry
  • * Spectroscopy

Background:

  • * Avian eggshells exhibit diverse coloration due to pigments.
  • * Understanding eggshell pigments aids in evolutionary and ecological studies.
  • * Non-destructive analysis methods are crucial for valuable museum specimens.

Purpose of the Study:

  • * To evaluate Raman spectroscopy for identifying avian eggshell pigments.
  • * To demonstrate the technique's diagnostic capability for biliverdin and protoporphyrin IX.
  • * To showcase the application in analyzing both extant and extinct avian eggshells.

Main Methods:

  • * Raman spectroscopy with various excitation wavelengths (1064 nm, 785 nm, 351 nm).
  • * Analysis of pigment-diagnostic Raman peaks and emission spectra.
  • * Application to eggshells of Elegant Crested Tinamou and Upland Moa.

Main Results:

  • * Biliverdin-pigmented eggshells showed characteristic Raman peaks under 785 nm excitation.
  • * Protoporphyrin IX-pigmented eggshells exhibited strong emission and informative resonance Raman spectra.
  • * Biliverdin was identified in extant (Elegant Crested Tinamou) and extinct (Upland Moa) eggshells.

Conclusions:

  • * Raman spectroscopy is a powerful, non-destructive tool for avian eggshell pigment analysis.
  • * The technique provides accurate diagnostic information on major eggshell constituents.
  • * This study supports broader use of Raman spectroscopy in coloration and pigment research.