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Related Concept Videos

Raman Spectroscopy: Overview01:20

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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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Resolving Water, Proteins, and Lipids from In Vivo Confocal Raman Spectra of Stratum Corneum through a Chemometric Approach
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A comparative study between human skin substitutes and normal human skin using Raman microspectroscopy.

Marie Leroy1, Jean-François Labbé2, Marise Ouellet2

  • 1Laboratoire d'Ingénierie de Surface (LIS), Département de Génie des Mines, de la Métallurgie et des Matériaux, Centre de Recherche sur les Matériaux Avancés (CERMA), Université Laval, 1065 avenue de la médecine, Québec, QC G1V 0A6, Canada; Centre de Recherche du CHU de Québec, Hôpital St-François d'Assise, 10 rue de l'Espinay, Québec, QC G1L 3L5, Canada; Centre LOEX de l'Université Laval, Génie Tissulaire et Régénération: LOEX-Centre de Recherche du CHU de Québec, Hôpital de l'Enfant Jesus, 1401, 18(e) rue, Québec, QC G1J 1Z4, Canada; Département de Chimie, Regroupement québécois sur la fonction, la structure et l'ingénierie des protéines (PROTEO), CERMA, Université Laval, 1045 avenue de la médecine, Québec, QC G1V 0A6, Canada.

Acta Biomaterialia
|February 18, 2014
PubMed
Summary

Bioengineered skin substitutes show similar protein structures to human skin but have fewer, more organized lipids. This research advances wound healing dressings and in vitro skin testing models.

Keywords:
Human skin substitutesLipid organizationProtein structureRaman microspectroscopy

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Area of Science:

  • Biotechnology
  • Tissue Engineering
  • Dermatology

Background:

  • Bioengineered skin substitutes are crucial for treating skin injuries like burns and diabetic ulcers.
  • Advances in tissue engineering enable the creation of self-assembled, material-free human skin substitutes.
  • These substitutes comprise a dermis and a stratified epidermis, mimicking natural skin structure.

Purpose of the Study:

  • To characterize and compare the molecular organization of bioengineered skin substitutes with normal human skin.
  • To evaluate lipid organization and protein secondary structure in engineered skin models.

Main Methods:

  • Raman microspectroscopy was employed to analyze molecular composition.
  • Comparison of lipid conformation (trans vs. gauche) and protein secondary structure was performed.

Main Results:

  • Both skin substitutes and normal skin exhibit well-ordered lipids (trans conformers) in the stratum corneum.
  • Living epidermis in both shows decreased lipids and increased gauche conformers.
  • Normal human skin contains more lipids and greater lipid organization than substitutes.
  • Protein secondary structure and content are similar between substitutes and normal skin, with epidermis rich in alpha-keratin and dermis in collagen type I.

Conclusions:

  • Bioengineered skin substitutes demonstrate comparable protein structures to native human skin.
  • Differences in lipid quantity and organization exist between substitutes and normal skin.
  • These findings support the use of these skin substitutes for wound healing and in vitro testing.