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Related Concept Videos

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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Raman Spectroscopy Instrumentation: Overview01:26

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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...
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IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
762

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Characterization and Differentiation of Candida auris on Dixon's Agar Using Raman Spectroscopy.

Chrysoula Petrokilidou1, Eleftherios Pavlou1, Aristea Velegraki2

  • 1Department of Medical Physics, Faculty of Medicine, University of Ioannina, 451 10 Ioannina, Greece.

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|November 27, 2024
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Summary

Raman spectroscopy can identify the challenging multidrug-resistant fungus Candida auris and differentiate it from other Candida species. This method shows potential for rapid, non-destructive fungal pathogen identification in clinical settings.

Keywords:
Raman spectroscopySORScandidacandida aurismodified Dixon’s agarspatially offset Raman spectroscopy

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Area of Science:

  • Biomedical Spectroscopy
  • Medical Mycology
  • Analytical Chemistry

Background:

  • Candida auris is a multidrug-resistant fungal pathogen causing healthcare-associated infections.
  • Accurate and rapid identification of C. auris is crucial for effective treatment and infection control.
  • Existing diagnostic methods struggle with differentiating C. auris from other Candida species, especially on non-standard media.

Purpose of the Study:

  • To evaluate Raman spectroscopy for identifying Candida auris on modified Dixon's agar (mDixon).
  • To differentiate C. auris from Candida albicans and Candida parapsilosis using spectral analysis.
  • To explore the potential of spatially offset Raman spectroscopy (SORS) for distinguishing fungal samples from the mDixon culture medium.

Main Methods:

  • Culturing Candida auris, Candida albicans, and Candida parapsilosis on mDixon agar.
  • Acquiring Raman spectra from fungal samples and the mDixon agar.
  • Utilizing principal component analysis (PCA) for spectral data analysis.
  • Employing spatially offset Raman spectroscopy (SORS) to analyze the culture medium.

Main Results:

  • Distinct Raman spectral markers (1171 cm⁻¹, 1452 cm⁻¹) were identified for C. auris, linked to mannan and β-glucan.
  • C. auris was differentiated into two subgroups (A and B) based on spectral characteristics.
  • PCA successfully distinguished between C. auris, C. albicans, and C. parapsilosis, despite spectral overlaps.
  • SORS provided a unique spectral signature for mDixon agar, enabling discrimination from fungal cells.

Conclusions:

  • Raman spectroscopy shows promise as a rapid, non-destructive tool for identifying Candida auris.
  • The method can differentiate C. auris from other common Candida species, aiding in clinical diagnostics.
  • Challenges remain in resolving subtle biochemical differences due to inter-individual variability and spectral overlap, necessitating improved spectral resolution and fluorescence reduction.