Abstract
Mass spectrometry-based plant metabolomics allow large-scale analysis of a wide range of compounds and the discovery of potential new active metabolites with minimal sample preparation. Despite recent tools for molecular networking, many metabolites remain unknown. Our objective is to show the complementarity of collision cross section (CCS) measurements and calculations for metabolite annotation in a real case study. Thus, a systematic and high-throughput investigation of root, bark, branch, and leaf of the Gabonese plant Zhanthoxylum heitzii was performed through ultra-high performance liquid chromatography high-resolution tandem mass spectrometry (UHPLC-QTOF/MS). A feature-based molecular network (FBMN) was employed to study the distribution of metabolites in the organs of the plants and discover potential new components. In total, 143 metabolites belonging to the family of alkaloids, lignans, polyphenols, fatty acids, and amino acids were detected and a semi-quantitative analysis in the different organs was performed. A large proportion of medical plant phytochemicals is often characterized by isomerism and, in the absence of reference compounds, an additional dimension of gas phase separation can result in improvements to both quantitation and compound annotation. The inclusion of ion mobility in the ultra-high performance liquid chromatography mass spectrometry workflow (UHPLC-IMS-MS) has been used to collect experimental CCS values in nitrogen and helium (CCSN2 and CCSHe) of Zhanthoxylum heitzii features. Due to a lack of reference data, the investigation of predicted collision cross section has enabled comparison with the experimental values, helping in dereplication and isomer identification. Moreover, in combination with mass spectra interpretation, the comparison of experimental and theoretical CCS values allowed annotation of unknown features. The study represents a practical example of the potential of modern mass spectrometry strategies in the identification of medicinal plant phytochemical components.
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Data availability
All the data are described within the manuscript. The raw data and metadata analyzed during the current study are available from the corresponding author on request. The molecular networking jobs can be publicly accessed at https://gnps.ucsd.edu/ProteoSAFe/status.jsp?task=813b6121f4a840dbaa2c5d9a969f7056 for positive mode and https://gnps.ucsd.edu/ProteoSAFe/status.jsp?task=022432bae4e94699aa73b973c8214451 for negative mode.
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Acknowledgements
The authors gratefully acknowledge Waters Corporation for the kind provision of the UNIFI software, Kevin Giles, PhD, for his advices, and the COBRA team for the support. The authors gratefully acknowledge Dr. Jean-Bernard Bongui for Z. heitzii providing.
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This work has been partially supported by University of Rouen Normandy, INSA Rouen Normandy, the Centre National de la Recherche Scientifique (CNRS), European Regional Development Fund (ERDF), Labex SynOrg (ANR-11-LABX-0029), Carnot Institut I2C, the graduate school for research Xl-Chem (ANR-18-EURE-0020 XL CHEM), and by Region Normandie.
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Calabrese, V., Schmitz-Afonso, I., Prevost, C. et al. Molecular networking and collision cross section prediction for structural isomer and unknown compound identification in plant metabolomics: a case study applied to Zhanthoxylum heitzii extracts. Anal Bioanal Chem 414, 4103–4118 (2022). https://doi.org/10.1007/s00216-022-04059-7
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DOI: https://doi.org/10.1007/s00216-022-04059-7