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Related Concept Videos

MALDI-TOF Mass Spectrometry01:19

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Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...
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Matrix-assisted laser desorption ionization (MALDI) is a powerful analytical technique used in mass spectrometry. It enables the identification and characterization of various biomolecules, including proteins, peptides, nucleic acids, and carbohydrates. MALDI is an ionization technique, widely employed in biological and medical research, as well as in fields like pharmacology and biochemistry.The analyte of interest, a biomolecule or a mixture of biomolecules, is mixed with a suitable matrix...
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Related Experiment Video

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Identification of Rare Bacterial Pathogens by 16S rRNA Gene Sequencing and MALDI-TOF MS
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Multicenter Study Demonstrates Standardization Requirements for Mold Identification by MALDI-TOF MS.

Anna F Lau1, Robert C Walchak2, Heather B Miller3

  • 1Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, MD, United States.

Frontiers in Microbiology
|October 17, 2019
PubMed
Summary

Accurate mold identification is crucial for treating infections. Researchers optimized Matrix-Assisted Laser Desorption/Ionization-Time of Flight Mass Spectrometry (MALDI-TOF MS) using the NIH Mold Database, improving fungal identification across multiple centers.

Keywords:
MALDI-TOF MSfilamentous fungiidentificationmoldrapid

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Area of Science:

  • Clinical microbiology
  • Mass spectrometry applications
  • Fungal diagnostics

Background:

  • Rapid and accurate mold identification is essential for effective antifungal therapy.
  • Matrix-Assisted Laser Desorption/Ionization-Time of Flight Mass Spectrometry (MALDI-TOF MS) is underutilized for routine mold identification due to database limitations and process standardization challenges.
  • The NIH Mold Database offers a potential solution for enhancing MALDI-TOF MS mold identification.

Purpose of the Study:

  • To evaluate the efficacy of the NIH Mold Database for routine mold identification in a multicenter setting.
  • To identify critical parameters for optimizing MALDI-TOF MS performance in mold identification.
  • To assess the impact of specialized acquisition programs on identification accuracy.

Main Methods:

  • Eight US academic centers participated in the evaluation.
  • A solid media extraction method and 80 clinical mold isolates were used.
  • Specialized acquisition programs (NIH method and Alternate-B method) were developed and tested.

Main Results:

  • Initial performance varied widely (33-77%) across centers using routine parameters.
  • Specialized acquisition programs (NIH method, Alternate-B method) significantly improved identification accuracy.
  • Optimized instrument maintenance and acquisition parameters were key to successful performance.

Conclusions:

  • Multicenter success in mold identification using the NIH Database for MALDI-TOF MS on Biotyper systems was achieved.
  • Critical program parameters and instrument optimization are vital for widespread implementation.
  • Developing an instrument performance standard for mold spectral acquisition is recommended to enhance reproducibility.