Please use this identifier to cite or link to this item: doi:10.22028/D291-34877
Title: Evaluating Different Storage Media for Identification of Taenia saginata Proglottids Using MALDI-TOF Mass Spectrometry
Author(s): Wendel, Tabea P.
Feucherolles, Maureen
Rehner, Jacqueline
Poppert, Sven
Utzinger, Jürg
Becker, Sören L.
Sy, Issa
Language: English
Title: Microorganisms
Volume: 9
Issue: 10
Publisher/Platform: MDPI
Year of Publication: 2021
Free key words: cestodes
diagnosis
helminth infections
matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry
neglected tropical diseases
taeniasis
DDC notations: 610 Medicine and health
Publikation type: Journal Article
Abstract: Taenia saginata is a helminth that can cause taeniasis in humans and cysticercosis in cattle. A species-specific diagnosis and differentiation from related species (e.g., Taenia solium) is crucial for individual patient management and disease control programs. Diagnostic stool microscopy is limited by low sensitivity and does not allow discrimination between T. saginata and T. solium. Molecular diagnostic approaches are not routinely available outside research laboratories. Recently, matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry (MS) was proposed as a potentially suitable technique for species-specific helminth diagnosis. However, standardized protocols and commercial databases for parasite identification are currently unavailable, and pre-analytical factors have not yet been assessed. The purpose of this study was to employ MALDI-TOF MS for the identification of T. saginata proglottids obtained from a human patient, and to assess the effects of different sample storage media on the technique’s diagnostic accuracy. We generated T. saginata-specific main spectral profiles and added them to an in-house database for MALDI-TOF MS-based diagnosis of different helminths. Based on protein spectra, T. saginata proglottids could be successfully differentiated from other helminths, as well as bacteria and fungi. Additionally, we analyzed T. saginata proglottids stored in (i) LC–MS grade water; (ii) 0.45% sodium chloride; (iii) 70% ethanol; and (iv) 37% formalin after 2, 4, 6, 8, 12, and 24 weeks of storage. MALDITOF MS correctly identified 97.2–99.7% of samples stored in water, sodium chloride, and ethanol, with log-score values ≥2.5, thus indicating reliable species identification. In contrast, no protein spectra were obtained for samples stored in formalin. We conclude that MALDI-TOF-MS can be successfully employed for the identification of T. saginata, and that water, sodium chloride, and ethanol are equally effective storage solutions for prolonged periods of at least 24 weeks.
DOI of the first publication: 10.3390/microorganisms9102006
Link to this record: urn:nbn:de:bsz:291--ds-348771
hdl:20.500.11880/31894
http://dx.doi.org/10.22028/D291-34877
ISSN: 2076-2607
Date of registration: 26-Oct-2021
Faculty: M - Medizinische Fakultät
Department: M - Infektionsmedizin
Professorship: M - Prof. Dr. Dr. Sören Becker
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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