Food Fingerprinting: LC-ESI-IM-QTOF-Based Identification of Blumeatin as a New Marker Metabolite for the Detection of Origanum majorana Admixtures to O. onites/vulgare

Oregano (Origanum vulgare and O. onites) is one of the most frequently counterfeited herbs in the world and is diluted with the leaves of a wide variety of plants. In addition to olive leaves, marjoram (O. majorana) is often used for this purpose in order to achieve a higher profit. However, apart f...

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Vydáno v:Metabolites Ročník 13; číslo 5; s. 673
Hlavní autoři: Creydt, Marina, Flügge, Friedemann, Dammann, Robin, Schütze, Burkhard, Günther, Ulrich L., Fischer, Markus
Médium: Journal Article
Jazyk:angličtina
Vydáno: Switzerland MDPI AG 20.05.2023
MDPI
Témata:
Chromatography
Fingerprinting
Flavonoids
Food
food fraud
Herbs
Ions
Leaves
Magnetic resonance spectroscopy
marjoram
Mass spectrometry
Mass spectroscopy
Metabolites
Metabolomics
NMR
Nuclear magnetic resonance
oregano
Scientific imaging
Chile
United States > US
Germany
mass spectrometry
food fraud
marjoram
metabolomics
oregano
ISSN:2218-1989, 2218-1989
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Popis
Shrnutí:Oregano (Origanum vulgare and O. onites) is one of the most frequently counterfeited herbs in the world and is diluted with the leaves of a wide variety of plants. In addition to olive leaves, marjoram (O. majorana) is often used for this purpose in order to achieve a higher profit. However, apart from arbutin, no marker metabolites are known to reliably detect marjoram admixtures in oregano batches at low concentrations. In addition, arbutin is relatively widespread in the plant kingdom, which is why it is of great relevance to look for further marker metabolites in order to secure the analysis accordingly. Therefore, the aim of the present study was to use a metabolomics-based approach to identify additional marker metabolites with the aid of an ion mobility mass spectrometry instrument. The focus of the analysis was on the detection of non-polar metabolites, as this study was preceded by nuclear magnetic resonance spectroscopic investigations of the same samples based mainly on the detection of polar analytes. Using the MS-based approach, numerous marjoram specific features could be detected in admixtures of marjoram >10% in oregano. However, only one feature was detectable in admixtures of >5% marjoram. This feature was identified as blumeatin, which belongs to the class of flavonoid compounds. Initially, blumeatin was identified based on MS/MS spectra and collision cross section values using a database search. In addition, the identification of blumeatin was confirmed by a reference standard. Moreover, dried leaves of olive, myrtle, thyme, sage and peppermint, which are also known to be used to adulterate oregano, were measured. Blumeatin could not be detected in these plants, so this substance can be considered as an excellent marker compound for the detection of marjoram admixtures.
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ISSN:2218-1989
2218-1989
DOI:10.3390/metabo13050673