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Updated: May 26, 2025

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Published on: July 11, 2016
Identification of Challenging Dermatophyte Species Using Matrix-Assisted Laser Desorption/Ionization Time-of-Flight
Tsung-Fu Tsai1,2, Yun-Chen Fan3, Jang-Jih Lu4
1Department of Dermatology, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan 333, Taiwan.
Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) can now accurately identify dermatophytes. Combining an in-house library with the Bruker library significantly improved species-level identification rates for filamentous fungi.
Area of Science:
- Medical Mycology
- Analytical Chemistry
- Microbiology
Background:
- Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) is standard for bacterial and yeast identification.
- Its application to filamentous fungi, like dermatophytes, is limited by inconsistent performance and library issues.
Purpose of the Study:
- To validate MALDI-TOF MS for dermatophyte identification using the Bruker Biotyper system.
- To develop and evaluate an expanded reference library for improved accuracy.
Main Methods:
- An in-house reference library was created for dermatophyte species within the Trichophyton, Nannizzia, Microsporum, and Epidermophyton genera.
- This library was combined with the existing Bruker library and tested against clinical isolates.
Main Results:
- The combined library correctly identified 90.7% of isolates at the species level.
- The commercial Bruker library alone achieved only 16.1% accuracy.
- An efficient, standardized protocol for routine dermatophyte identification was established.
Conclusions:
- An expanded MALDI-TOF MS library significantly enhances dermatophyte identification accuracy.
- This study provides a validated protocol and review for MALDI-TOF MS-based dermatophyte identification.
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