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Wojtanowski KK, Mroczek T. Detection, Identification and Structural Elucidation of Flavonoids using Liquid Chromatography Coupled to Mass Spectrometry. CURR ORG CHEM 2020. [DOI: 10.2174/1385272824666200123104815] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Flavonoids are one of the most common secondary metabolites occurring in plants. Their activity in the Central Nervous System (CNS) including sedative, anxiolytic, anti-convulsive, anti-depressant and neuro-protective actions is well known and documented. The most popular methods for detection, identification and structural elucidation of flavonoids are these based on Nuclear Magnetic Resonance (NMR) and mass spectrometry (MS). NMR allows rapid, high throughput analysis of crude extracts and also gives stereochemical details about identified substances. However, these methods are expensive and less sensitive than MS-based techniques. Combining High Performance Liquid Chromatography (HPLC) with MS detection gives the most powerful tool for analysis of flavonoids occurring in plants. There is a lot of different approaches to use LC/MS based techniques for identification of flavonoids and this short review shows the most important.
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Affiliation(s)
- Krzysztof Kamil Wojtanowski
- Independent Laboratory of Natural Product Chemistry, Chair of Pharmacognosy, Medical University of Lublin, 1 Chodzki Street, 20-093 Lublin, Poland
| | - Tomasz Mroczek
- Independent Laboratory of Natural Product Chemistry, Chair of Pharmacognosy, Medical University of Lublin, 1 Chodzki Street, 20-093 Lublin, Poland
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Kurka O, Kučera L, Pelantová H, Kuzma M, Havlíček V, Bednář P. Semisynthesis and spectral characterization of 5-methylpyranopelargonidin and 4-methylfuropelargonidin and their separation and detection in strawberry fruit wine. J Chromatogr A 2017. [PMID: 28648259 DOI: 10.1016/j.chroma.2017.06.051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Condensation of anthocyanins and their aglycons with small organic molecules yields more stable natural dyes, e.g. pyranoanthocyanins arising spontaneously in various food products. Reaction of pelargonidin with acetone produces two isomeric anthocyanidin dyes - 5-methylpyranopelargonidin and 4-methylfuropelargonidin. A robust semipreparative liquid chromatographic method was developed to isolate both derivatives from a simple aged solution of pelargonidin in methanol: acetone: 37% aqueous hydrochloric acid (1:1:0.008, v/v/v). Detailed interpretation of mass and nuclear magnetic resonance spectra allowed to assign structures of both dyes in isolated fractions. A fast UHPLC-MS method was optimized for the control of their production in the reaction mixture. Use of reversed stationary phase and acidic mobile phases in gradient mode allowed separation of both isomers in less than one minute. Fragmentation of both dyes after collision activated dissociation in collision cell was studied comprehensively and the observed processes were compared with data from quantum calculations (computational chemistry utilizing DFT methods). When comparing both isomers, retro-Diels-Alder fragmentation appears preferred in furo-derivative, while small losses (i.e. methane and water molecules) were more pronounced in pyrano-derivative. Both studied isomeric dyes were found in laboratory prepared strawberry fruit wine and their content was compared with major present anthocyanins and their derivatives.
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Affiliation(s)
- Ondřej Kurka
- Regional Centre of Advanced Technologies and Materials, Department of Analytical Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, 771 46, Olomouc, Czech Republic
| | - Lukáš Kučera
- Regional Centre of Advanced Technologies and Materials, Department of Analytical Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, 771 46, Olomouc, Czech Republic
| | - Helena Pelantová
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Vídeňská 1083, 142 20 Prague 4, Czech Republic
| | - Marek Kuzma
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Vídeňská 1083, 142 20 Prague 4, Czech Republic
| | - Vladimír Havlíček
- Regional Centre of Advanced Technologies and Materials, Department of Analytical Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, 771 46, Olomouc, Czech Republic; Institute of Microbiology, Academy of Sciences of the Czech Republic, Vídeňská 1083, 142 20 Prague 4, Czech Republic
| | - Petr Bednář
- Regional Centre of Advanced Technologies and Materials, Department of Analytical Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, 771 46, Olomouc, Czech Republic.
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