Abstract
Purpose
Detection of Clostridium perfringens enterotoxin (CPE) in human stool is critical evidence of food poisoning. However, processing patient-derived samples is difficult and very few methods exist to confirm the presence of CPE. In this study, a technique was developed using proteomic analysis to identify and quantify CPE in artificial gut fluid as an alternative.
Methods
The standard CPE was spiked into artificial gut fluids, and effective methods were developed by employing both a stable isotope-labelled internal standard peptide and liquid chromatography–tandem mass spectrometry (LC–MS/MS).
Results
Proteotypic peptide EILDLAAATER formed by tryptic digestion was selected for quantitation of CPE. The peptide was identified using product ion spectra. Although the nontoxic peptides originating from CPE showed very low detectability in extraction and tryptic digestion, they could be detected with sufficient sensitivity using the method we developed. Based on a spiked recovery test at two concentrations (50 and 200 µg/kg), the recovery values were 85 and 78%, respectively. The relative standard deviations of repeatability and within-laboratory reproducibility were less than 8 and 11%, respectively. These standard deviations satisfied the criteria of the Japanese validation guidelines for residues (MHLW 2010, Director Notice, Syoku-An No. 1224–1). The limit of quantification (LOQ) was estimated to be 50 µg/kg. The combination of the product ion spectra and relative ion ratio supported CPE identification at the LOQ level.
Conclusions
To the best of our knowledge, this is the first report of proteomic analysis of CPE using LC–MS/MS. The method would greatly help in assessing CPE reliably.
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Data availability statement
The datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The authors would like to thank Jun’ichi Nakajima from the Department of Pharmaceutical and Environmental Science at the Tokyo Metropolitan Institute of Public Health for his helpful review of this manuscript.
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Conceptualization: HK; investigation: HK; validation: HK; writing—original draft: HK; writing—review and editing: MK; project administration: MK; data curation: SY, HH, YM, YO, MH, and CN; resources: SY and HH; supervision: KO, JK and TS; methodology: JK.
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11419_2023_660_MOESM1_ESM.tif
Supplementary file1 Comparison of peak shapes in LC-MS/MS chromatograms using organic mobile phases: (a) acetonitrile containing 0.1% formic acid and (b) methanol containing 0.1% formic acid. Each peptide was obtained in Clostridium perfringens enterotoxin (CPE) standard solution at 1000 µg/L: (left) the quantitative transition (m/z 601.3/618.3), and (right) the transition (m/z 596.8/591.3). (TIF 155 KB)
11419_2023_660_MOESM2_ESM.tif
Supplementary file2 Comparison of background signals in total ion current chromatograms of blank artificial gut fluid samples (m/z 60–660) (a) without and (b) with the desalting process (GL-Tip SDB). The black arrow indicates the ion suppression. (TIF 67 KB)
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Koike, H., Kanda, M., Yoshikawa, S. et al. Proteomic identification and quantification of Clostridium perfringens enterotoxin using a stable isotope-labelled peptide via liquid chromatography–tandem mass spectrometry. Forensic Toxicol 41, 249–259 (2023). https://doi.org/10.1007/s11419-023-00660-2
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DOI: https://doi.org/10.1007/s11419-023-00660-2