Tyrosol and Hydroxytyrosol Determination in Extra Virgin Olive Oil with Direct Liquid Electron Ionization-Tandem Mass Spectrometry

Extra virgin olive oil (EVOO) is one of the main ingredients of the Mediterranean diet. It is claimed as a functional food for its unique content of health-promoting compounds. Tyrosol (Tyr), Hydroxytyrosol (Htyr), and their phenolic derivatives present in EVOO show beneficial properties, and their...

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Bibliographic Details
Published inSeparations Vol. 8; no. 10; p. 173
Main Authors Termopoli, Veronica, Piergiovanni, Maurizio, Cappiello, Achille, Palma, Pierangela, Famiglini, Giorgio
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.10.2021
Subjects
Calibration
Chromatography
Electrons
extra virgin olive oil (EVOO)
Flavonoids
Free form
Functional foods & nutraceuticals
Hydrolysis
hydroxytyrosol
Ionization
LC–MS
liquid electron ionization (LEI)
Mass spectrometry
Methods
Olive oil
Phenols
Polyphenols
Regulation
Scientific imaging
Selectivity
tyrosol
Italy
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Summary:Extra virgin olive oil (EVOO) is one of the main ingredients of the Mediterranean diet. It is claimed as a functional food for its unique content of health-promoting compounds. Tyrosol (Tyr), Hydroxytyrosol (Htyr), and their phenolic derivatives present in EVOO show beneficial properties, and their identification and quantification, both in their free form and after the hydrolysis of more complex precursors, are important to certify its quality. An alternative method for quantifying free and total Tyr and Htyr in EVOO is presented using an LC–MS interface based on electron ionization (EI), called liquid electron ionization (LEI). This method requires neither sample preparation nor chromatography; the sample is diluted and injected. The selectivity and sensitivity were assessed in multiple reaction monitoring mode (MRM), obtaining confirmation and quantification in actual samples ranging from 5 to 11 mg/Kg for the free forms and from 32 to 80 mg/Kg for their total amount after hydrolysis. Two MS/MS transitions were acquired for both compounds using the Q/q ratios as confirmatory parameters. Standard addition calibration curves demonstrated optimal linearity and negligible matrix effects, allowing a correct quantification even without expensive and difficult to find labeled internal standards. After several weeks of operation, the system’s repeatability was excellent, with an intraday RSD (%) spanning from five to nine and an interday RSD (%) spanning from 9 to 11.
ISSN:2297-8739
2297-8739
DOI:10.3390/separations8100173