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Related Experiment Video

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Observation and Analysis of Blinking Surface-enhanced Raman Scattering
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Identification of mycolic acid forms using surface-enhanced Raman scattering as a fast detection method for

Jayakumar Perumal1, U S Dinish1, Anne K Bendt2

  • 1Laboratory of Bio-optical Imaging, Singapore Bioimaging Consortium, Agency for Science, Technology, and Research (ASTAR), Singapore, malini_olivo@sbic.a-star.edu.sg; dinish@sbic.a-star.edu.sg.

International Journal of Nanomedicine
|October 17, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a rapid Surface-Enhanced Raman Scattering (SERS) method for detecting mycolic acids, a key biomarker for tuberculosis (TB). This advancement promises faster and more accurate TB diagnosis, crucial for global health.

Keywords:
Ag SNPsLC-MSMAMTBMycobacterium tuberculosisNTMSERSliquid chromatography mass spectrometrymycolic acidnontuberculosis mycobacteriasilver-coated silicon nanopillars

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Area of Science:

  • Biochemistry
  • Spectroscopy
  • Microbiology

Background:

  • Tuberculosis (TB) remains a leading infectious cause of death globally, imposing significant healthcare burdens, particularly in developing nations.
  • Current TB diagnostic methods are often slow, taking weeks, or lack sufficient accuracy and specificity.
  • Early diagnosis and effective treatment are critical for preventing TB-related mortality.

Purpose of the Study:

  • To develop a rapid and efficient diagnostic technique for tuberculosis (TB).
  • To utilize Surface-Enhanced Raman Scattering (SERS) for the detection of mycolic acids (MAs), a biomarker for Mycobacterium species.
  • To overcome the limitations of conventional TB detection methods regarding speed, specificity, and accuracy.

Main Methods:

  • Obtained label-free, direct detection SERS spectra of synthetic and extracted mycolic acids (MAs).
  • Collected SERS spectra from gamma-irradiated whole bacteria (WB) and MA extracts.
  • Utilized silver (Ag) coated silicon nanopillar (Ag SNP) substrates for SERS measurements.

Main Results:

  • Successfully demonstrated SERS-based detection of mycolic acids (MA), a biomarker for Mycobacterium tuberculosis.
  • Achieved SERS spectral characterization of three major MA forms (αMA, methoxy-MA, keto-MA) in bacterial extracts and irradiated whole bacteria.
  • Validated SERS findings using mass spectrometry, showing potential for differentiating pathogenic and nonpathogenic Mycobacterium species.

Conclusions:

  • Direct SERS detection of three major MA forms was achieved in various Mycobacterium tuberculosis (MTB) samples.
  • This SERS approach offers a potential pathway towards a fast and efficient TB detection method.
  • The developed technique holds high clinical significance for improving TB diagnostics.