1
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Song Y, Song Q, Liu W, Li J, Tu P. High-confidence structural identification of metabolites relying on tandem mass spectrometry through isomeric identification: A tutorial. Trends Analyt Chem 2023. [DOI: 10.1016/j.trac.2023.116982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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2
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Rocha JS, Pereira GB, Oliveira GP, Lima MA, Araujo-Neto JH, Pinto LS, Forim MR, Zanetti RD, Netto AV, Castellano EE, Rocha FV. Synthesis and characterization of silver(I) complexes bearing phenanthroline derivatives as ligands: Cytotoxicity and DNA interaction evaluation. INORG CHEM COMMUN 2021. [DOI: 10.1016/j.inoche.2021.108757] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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3
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Diversity of red, green and black cultivars of Chinese Toon [Toona sinensis (A. Juss.) Roem]: anthocyanins, flavonols and antioxidant activity. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2020. [DOI: 10.1007/s11694-020-00560-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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4
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Yang E, Fournelle F, Chaurand P. Silver spray deposition for AgLDI imaging MS of cholesterol and other olefins on thin tissue sections. JOURNAL OF MASS SPECTROMETRY : JMS 2020; 55:e4428. [PMID: 31410898 DOI: 10.1002/jms.4428] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 07/26/2019] [Accepted: 08/05/2019] [Indexed: 06/10/2023]
Abstract
Olefins such as cholesterol and unsaturated fatty acids play important biological roles. Silver-assisted laser desorption ionization (AgLDI) takes advantage of the strong affinity of silver to conjugate with double bonds to selectively ionize these molecules for imaging mass spectrometry (IMS) experiments. For IMS studies, two main approaches for silver deposition have been described in the literature: fine coating by silver sputtering and spray deposition of silver nanoparticles. While these approaches allow for extremely high resolution IMS experiments to be conducted, they are not readily available to all laboratories. Herein, we present a silver nitrate spray deposition approach as an alternative to silver sputtering and nanoparticle deposition for routine IMS analysis. The silver nitrate spray has the same level of specificity and sensitivity for olefins, particularly cholesterol, and has shown to be capable of IMS experiments down to 10-μm spatial resolution. Minimal sample preparation and the affordability of silver nitrate make this a convenient and accessible technique worth considering.
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Affiliation(s)
- Ethan Yang
- Department of Chemistry, University of Montreal, Montreal, Quebec, Canada, H3C 3J7
| | - Frédéric Fournelle
- Department of Chemistry, University of Montreal, Montreal, Quebec, Canada, H3C 3J7
| | - Pierre Chaurand
- Department of Chemistry, University of Montreal, Montreal, Quebec, Canada, H3C 3J7
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5
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Laurini E, Andreani S, Muselli A, Pricl S, Tintaru A. Direct Identification of α-Bisabolol Enantiomers in an Essential Oil Using a Combined Ion Mobility-Mass Spectrometry/Quantum Chemistry Approach. JOURNAL OF NATURAL PRODUCTS 2020:acs.jnatprod.9b00982. [PMID: 32212660 DOI: 10.1021/acs.jnatprod.9b00982] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Enantiomer-specific identification of chiral molecules in natural extracts is a challenging task, as many routine analytical techniques fail to provide selectivity in multicomponent mixtures. Here we describe an alternative approach, based on the combination of ion mobility-mass spectrometry (IM-MS) and quantum chemistry (QM), for the direct enantiomers differentiation in crude essential oils. The identification of α-bisabolol enantiomers contained in the raw essential oil (EO) from the Corsican Xanthium italicum fruits is reported as a proof-of-concept. Accordingly, IM-MS experiments performed in Ag+-doped methanol revealed the presence of both (+)- and (-)-α-bisabolol in the EO, while molecular simulations provided the structures of the two α-bisabolol enantiomer silver(I) adducts.
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Affiliation(s)
- Erik Laurini
- Molecular Biology and Nanotechnology Laboratory (MolBNL@UniTS), DEA, University of Trieste, 34127 Trieste, Italy
| | - Stéphane Andreani
- Université de Corse, UMR CNRS 6134 SPE, Laboratoire Chimie des Produits Naturels (CPN), Campus Grimaldi, BP 52, 20250 Corte, France
| | - Alain Muselli
- Université de Corse, UMR CNRS 6134 SPE, Laboratoire Chimie des Produits Naturels (CPN), Campus Grimaldi, BP 52, 20250 Corte, France
| | - Sabrina Pricl
- Molecular Biology and Nanotechnology Laboratory (MolBNL@UniTS), DEA, University of Trieste, 34127 Trieste, Italy
- Department of General Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, 90-136 Lodz, Poland
| | - Aura Tintaru
- Aix Marseille Univ, CNRS, Institut de Chimie Radicalaire, UMR7273, 13397 Marseille, France
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6
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De Gregorio G, Biasotto F, Hecel A, Luczkowski M, Kozlowski H, Valensin D. Structural analysis of copper(I) interaction with amyloid β peptide. J Inorg Biochem 2019; 195:31-38. [DOI: 10.1016/j.jinorgbio.2019.03.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 03/04/2019] [Accepted: 03/05/2019] [Indexed: 12/01/2022]
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7
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Atta EM, Hegab KH, Abdelgawad AAM, Youssef AA. Synthesis, characterization and cytotoxic activity of naturally isolated naringin-metal complexes. Saudi Pharm J 2019; 27:584-592. [PMID: 31061628 PMCID: PMC6488849 DOI: 10.1016/j.jsps.2019.02.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Indexed: 01/10/2023] Open
Abstract
High-purity naringin was isolated from the fruit peels of Citrus maxima and characterized by various spectroscopic methods like UV and NMR. The isolated compound ligand (HL) was used as ligand-metal complexes synthesis after using Ag (I), Y (III) and Ru (III) metals. These ligand-metal complexes were characterized by elemental analysis, FT-IR, UV–VIS, TGA, molar conductance and magnetic properties. Cytotoxic activity of the isolated naringin and its metal complexes were investigated against two human cancer cell lines namely, white breast Adenocarcinoma (MCF7) and Lung carcinoma (A549) using cell viability assay. Transition metal increased the cytotoxic activity of naringin when they were conjugated. LC50 of Ag ligand complex demonstrated strong cytotoxicity against MCF-7 and A549 cell line that was found higher active more than three and four times the strength, respectively when compared to LC50 of Adriamycin. While LC50 of Adriamycin compound was slightly more active only about 30% and twice the strength of the Ru ligand complex against MCF-7 and A549 cell line, respectively.
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Affiliation(s)
- Emad M Atta
- Chemistry Dept., Faculty of Science, Jazan Univ., Saudi Arabia.,Genetic Engineering and Biotechnology Research Institute Univ. of Sadat City, Egypt
| | - Khaled H Hegab
- Chemistry Dept., Faculty of Science, Jazan Univ., Saudi Arabia.,Inorganic Chemistry Dept. National Research Center, Giza, Egypt
| | - Ahmed A M Abdelgawad
- Chemistry Dept., Faculty of Science, Jazan Univ., Saudi Arabia.,Medicinal and Aromatic Plants Dept., Desert Research Center, Cairo, Egypt
| | - Abdelghany A Youssef
- Chemistry Dept., Faculty of Science, Jazan Univ., Saudi Arabia.,Medicinal and Aromatic Plants Researches Dept., Pharmaceutical and Drug Industries Division, N. R. C., Giza, Egypt
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8
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Mandial D, Khullar P, Kumar H, Ahluwalia GK, Bakshi MS. Naringin-Chalcone Bioflavonoid-Protected Nanocolloids: Mode of Flavonoid Adsorption, a Determinant for Protein Extraction. ACS OMEGA 2018; 3:15606-15614. [PMID: 31458217 PMCID: PMC6643453 DOI: 10.1021/acsomega.8b01776] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Accepted: 10/29/2018] [Indexed: 05/04/2023]
Abstract
In order to highlight the applications of bioflavonoids in materials chemistry, naringin and its chalcone form were used in the nanomaterial synthesis to produce flavonoid-conjugated nanomaterials in aqueous phase. Chalcone form proved to be excellent reducing as well as stabilizing agent in the synthesis of monodisperse Au, Ag, and Pd nanoparticles (NPs) of ∼5-15 nm, following in situ reaction conditions where no external reducing or stabilizing agents were used. The mechanism of NP surface adsorption of flavonoid was determined with the help of dynamic light scattering and zeta potential measurements. Surface-adsorbed flavonoids also allowed NPs to easily transfer into the organic phase by using aqueous insoluble ionic liquid. Pd NPs attracted the excessive amount of surface adsorption of both naringin as well as its chalcone form that in turn drove Pd NPs in self-assembled state in comparison to Au or Ag NPs. An amount of surface-adsorbed flavonoids selectively determined the extraction of protein fractions from complex zein corn starch protein solution. Self-assembled Pd NPs with a large amount of surface-adsorbed naringin preferentially extracted zein fraction of higher molar mass, whereas Au and Ag NPs almost equally extracted the zein fractions of lower molar masses.
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Affiliation(s)
- Divya Mandial
- Department
of Chemistry, B.B.K. D.A.V. College for
Women, Amritsar 143005 Punjab, India
| | - Poonam Khullar
- Department
of Chemistry, B.B.K. D.A.V. College for
Women, Amritsar 143005 Punjab, India
- E-mail: (P.K.)
| | - Harsh Kumar
- Department
of Chemistry, Dr. B. R. Ambedkar National
Institute of Technology, Jalandhar, 144011 Punjab, India
| | - Gurinder Kaur Ahluwalia
- Nanotechnology
Research Laboratory, College of North Atlantic, Labrador City, Newfoundland
and Labrador A2V 2K7, Canada
| | - Mandeep Singh Bakshi
- Department
of Natural and Applied Sciences, University
of Wisconsin−Green Bay, 2420 Nicolet Drive, Green
Bay, Wisconsin 54311-7001, United States
- E-mail: (M.S.B.)
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9
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Tong C, Tong X, Shi S, Guo K. Rapid discrimination and quantification of isomeric flavonoid-O-diglycosides in Citrus paradisi cv. changshanhuyou by online extraction-quadrupole time-of flight tandem mass spectrometry. J Pharm Biomed Anal 2018; 165:24-30. [PMID: 30500597 DOI: 10.1016/j.jpba.2018.11.049] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Revised: 10/22/2018] [Accepted: 11/20/2018] [Indexed: 01/19/2023]
Abstract
Rapid differentiation, characterization and quantification of isomers from complex mixtures by direct mass spectrometry (MS) remained an analytical challenge due to their similar or identical MS/MS spectra and matrix interferences. Here, we reported a novel online extraction-quadrupole time-of-flight tandem mass spectrometry (OLE-QTOF-MS/MS) system to rapid, efficient and sensitive analysis of interglycosidic linkage isomers (hesperidin and neohesperidin) in Citrus paradisi cv. Changshanhuyou (Changshanhuyou). OLE system packed with solid Changshanhuyou (0.02 mg) could be firstly used to online remove interferences with large polarities, and then online extract and enrich hesperidin and neohesperidin, which shows great potential to diminish the analysis time of sample pretreatment, as well as to reduce matrix effects and instrument consumption. Detailed fragmentation analysis found that, under positive ion mode, relative abundance of specific fragment ions m/z 449 to m/z 303 showed linear correlation to the mass content of hesperidin (0% to 100%) with good correlation coefficient (R2 = 0.9958). Utilizing this method, the mass ratio of hesperidin to neohesperidin in Changshanhuyou was relatively quantified as 3.7:96.3 with RSD at 2.9%. Finally, using internal standard method, the absolute quantitative analysis was performed with acceptable reproducibility (RSD 1.3 and 4.5% for intra- and inter-day variations) and recoveries (from 95.9% to 108.9%), acceptable limit of detection (0.33 ng). In general, OLE-QTOF-MS/MS represented a promising and practical method for simple, rapid and effective analysis of isomeric compounds in complex matrices.
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Affiliation(s)
- Chaoying Tong
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, PR China; Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety, Central South University, Changsha, 410083, PR China
| | - Xia Tong
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, PR China
| | - Shuyun Shi
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, PR China; Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety, Central South University, Changsha, 410083, PR China.
| | - Keke Guo
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, PR China; Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Central South University, Changsha, 410083, PR China
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10
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Longo E, Rossetti F, Merkyte V, Obiedzińska A, Boselli E. Selective binding of potassium and calcium ions to novel cyclic proanthocyanidins in wine by HPLC-HRMS. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2018; 32:1637-1642. [PMID: 29964346 DOI: 10.1002/rcm.8221] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 06/19/2018] [Accepted: 06/21/2018] [Indexed: 05/11/2023]
Abstract
RATIONALE Cyclic B-type (referred also as crown) proanthocyanidins were recently identified in wines. An HPLC-HRMS/MS method was applied to study the binding of cyclic and non-cyclic PAC to potassium and calcium ions, which affect the chemico-physical stability of wines. Different binding affinities suggest that cyclic and non-cyclic analogues, despite the equal number of monomer units, influence the colloidal stability of wine and are related to the grape variety or winemaking conditions. METHODS Nineteen red and white wines were analysed by HPLC high resolution tandem mass spectrometry with positive electrospray ionization to investigate the distribution of novel cyclic proanthocyanidins and their calcium, potassium and sodium adducts. Principal Component Analysis was used to study the distribution of the wines and the relationships among proanthocyanidins with and without cation complexes. RESULTS A dependence on specific isomers (and conformations) was found for the non-cyclic procyanidin (PC) trimer whereas the cyclic tetrameric PAC were shown to bind better to potassium than their non-cyclic analogues. The binding to these metals appeared to be influenced not only be the number of monomer units but also by the conformation assumed by the molecules. Statistical analysis evidenced that the adducts distribution in different wines is less influenced by the grape variety used for winemaking than their associated [M+H]+ species studied earlier. CONCLUSIONS Wines from 19 grape varieties were investigated in order to identify potassium and calcium complexes of non- and cyclic B-type proanthocyanidins that were recently discovered. The results showed a dependence of the distribution of metal complexes according to the cyclic or non cyclic geometry of proanthocyanidins. The multivariate analysis of the mass spectrometric results showed a relationship with the grape variety, however not so straightforward as evidenced for the non-complexed species.
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Affiliation(s)
- Edoardo Longo
- Faculty of Science and Technology, Free University of Bozen-Bolzano, Piazza Università 1, Bozen-Bolzano, Italy
| | - Fabrizio Rossetti
- Department of Agricultural, Food and Environmental Sciences, Marche Polytechnic University, Via Brecce Bianche, 10, 60131, Ancona, Italy
| | - Vakare Merkyte
- Faculty of Science and Technology, Free University of Bozen-Bolzano, Piazza Università 1, Bozen-Bolzano, Italy
| | - Agnieszka Obiedzińska
- Faculty of Computer Science and Food Science, Lomza State University of Applied Sciences, Lomza, Akademicka 1, 18-400, Łomża, Poland
| | - Emanuele Boselli
- Faculty of Science and Technology, Free University of Bozen-Bolzano, Piazza Università 1, Bozen-Bolzano, Italy
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11
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Jeanne Dit Fouque K, Moreno J, Hegemann JD, Zirah S, Rebuffat S, Fernandez-Lima F. Metal ions induced secondary structure rearrangements: mechanically interlocked lassovs.unthreaded branched-cyclic topoisomers. Analyst 2018; 143:2323-2333. [DOI: 10.1039/c8an00138c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Metal ions can play a significant role in a variety of important functions in protein systems including cofactor for catalysis, protein folding, assembly, structural stability and conformational change.
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Affiliation(s)
| | - Javier Moreno
- Department of Chemistry and Biochemistry
- Florida International University
- Miami
- USA
| | | | - Séverine Zirah
- Laboratory Molecules of Communication and Adaptation of Microorganisms
- National Museum of Natural History
- Sorbonne Univ
- 75005 Paris
- France
| | - Sylvie Rebuffat
- Laboratory Molecules of Communication and Adaptation of Microorganisms
- National Museum of Natural History
- Sorbonne Univ
- 75005 Paris
- France
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12
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Rossich Molina E, Eizaguirre A, Haldys V, Urban D, Doisneau G, Bourdreux Y, Beau J, Salpin J, Spezia R. Characterization of Protonated Model Disaccharides from Tandem Mass Spectrometry and Chemical Dynamics Simulations. Chemphyschem 2017; 18:2812-2823. [DOI: 10.1002/cphc.201700202] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 05/09/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Estefania Rossich Molina
- LAMBE, Univ Evry, CEA, CNRSUniversité Paris-Saclay F-91025 Evry France
- LAMBE, Université Cergy-PontoiseUniversité Paris-Seine F-91025 Evry France
| | - Ane Eizaguirre
- LAMBE, Univ Evry, CEA, CNRSUniversité Paris-Saclay F-91025 Evry France
- LAMBE, Université Cergy-PontoiseUniversité Paris-Seine F-91025 Evry France
| | - Violette Haldys
- LAMBE, Univ Evry, CEA, CNRSUniversité Paris-Saclay F-91025 Evry France
- LAMBE, Université Cergy-PontoiseUniversité Paris-Seine F-91025 Evry France
| | - Dominique Urban
- ICMMO—SM2B, Univ Paris-SudUniversité Paris-Saclay and CNRS F-91405 Orsay France
| | - Gilles Doisneau
- ICMMO—SM2B, Univ Paris-SudUniversité Paris-Saclay and CNRS F-91405 Orsay France
| | - Yann Bourdreux
- ICMMO—SM2B, Univ Paris-SudUniversité Paris-Saclay and CNRS F-91405 Orsay France
| | - Jean‐Marie Beau
- ICMMO—SM2B, Univ Paris-SudUniversité Paris-Saclay and CNRS F-91405 Orsay France
| | - Jean‐Yves Salpin
- LAMBE, Univ Evry, CEA, CNRSUniversité Paris-Saclay F-91025 Evry France
- LAMBE, Université Cergy-PontoiseUniversité Paris-Seine F-91025 Evry France
| | - Riccardo Spezia
- LAMBE, Univ Evry, CEA, CNRSUniversité Paris-Saclay F-91025 Evry France
- LAMBE, Université Cergy-PontoiseUniversité Paris-Seine F-91025 Evry France
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13
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Wang Y, Zhong H, Yu HT. Theoretical investigation of the fragmentation mechanism of singly positively charged 5-methoxyflavone. COMPUT THEOR CHEM 2017. [DOI: 10.1016/j.comptc.2017.01.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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14
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de Souza LM, Dartora N, Scoparo CT, Gorin PA, Iacomini M, Sassaki GL. Differentiation of flavonol glucoside and galactoside isomers combining chemical isopropylidenation with liquid chromatography–mass spectrometry analysis. J Chromatogr A 2016; 1447:64-71. [DOI: 10.1016/j.chroma.2016.03.069] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2015] [Revised: 03/21/2016] [Accepted: 03/23/2016] [Indexed: 11/27/2022]
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15
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Makola MM, Steenkamp PA, Dubery IA, Kabanda MM, Madala NE. Preferential alkali metal adduct formation by cis geometrical isomers of dicaffeoylquinic acids allows for efficient discrimination from their trans isomers during ultra-high-performance liquid chromatography/quadrupole time-of-flight mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2016; 30:1011-8. [PMID: 27003038 DOI: 10.1002/rcm.7526] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Revised: 01/21/2016] [Accepted: 02/01/2016] [Indexed: 05/15/2023]
Abstract
RATIONALE Caffeoylquinic acid (CQA) derivatives are a group of structurally diverse phytochemicals that have attracted attention due to their many health benefits. The structural diversity of these molecules is due in part to the presence of regio- and geometrical isomerism. This structural diversity hampers the accurate annotation of these molecules in plant extracts. Mass spectrometry (MS) is successfully used to differentiate between the different regioisomers of the CQA derivatives; however, the accurate discrimination of the geometrical isomers of these molecules has proven to be an elusive task. METHODS UV-irradiated methanolic solutions of diCQA were analyzed using an ultra-high-performance liquid chromatography/quadrupole time-of-flight mass spectrometry (UHPLC/QTOFMS) method in negative ionisation mode. An in-source collision-induced dissociation (ISCID) method was optimized by varying both the capillary and cone voltages to achieve differential fragmentation patterns between UV-generated geometrical isomers of the diCQAs during MS analyses. RESULTS Changes in the capillary voltage did not cause a significant difference to the fragmentation patterns of the four geometrical isomers, while changes in the cone voltage resulted in significant differences in the fragmentation patterns. The results also show, for the first time, the preferential formation of alkali metal (Li(+), Na(+) and K(+)) adducts by the cis geometrical isomers of diCQAs, compared to their trans counterparts. CONCLUSIONS Optimized QTOFMS-based methods may be used to differentiate the geometrical isomers of diCQAs. Finally, additives such as metal salts to induce adduct formation can be applied as an alternative method to differentiate closely related isomers which could have been difficult to differentiate under normal MS settings.
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Affiliation(s)
- Mpho M Makola
- Department of Biochemistry, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa
| | - Paul A Steenkamp
- Department of Biochemistry, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa
- CSIR Biosciences, Natural Products and Agroprocessing Group, Pretoria, 0001, South Africa
| | - Ian A Dubery
- Department of Biochemistry, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa
| | - Mwadham M Kabanda
- Department of Chemistry, North-West University (Mafikeng Campus), Private Bag x2046, Mmabatho, 2735, South Africa
| | - Ntakadzeni E Madala
- Department of Biochemistry, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa
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16
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Butler M, Cabrera GM. A mass spectrometry-based method for differentiation of positional isomers of monosubstituted pyrazine N-oxides using metal ion complexes. JOURNAL OF MASS SPECTROMETRY : JMS 2015; 50:136-144. [PMID: 25601685 DOI: 10.1002/jms.3506] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Revised: 09/05/2014] [Accepted: 09/10/2014] [Indexed: 06/04/2023]
Abstract
A series of 11 pairs of substituted pyrazine N-oxides, differing in the substituent position, were examined using electrospray ionization mass spectrometry (ESI-MS) in order to use spectra to assess the differentiation of positional isomers. For each compound, mass spectra were recorded with three different metal cations, namely calcium (II), copper (II) and aluminum (III), with characterization of the observed peaks. Differentiation between regioisomeric N-oxides has been achieved by comparison of the identity and relative intensities of the peaks originating from the adduct ions formed with the metal ions. Principal component analysis (PCA) has been employed to assist in the interpretation of the results obtained with each metal ion, exploring possible trends according to the nature and position of the substituent in the pyrazine N-oxide.
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Affiliation(s)
- Matías Butler
- Departamento de Química Orgánica, UMyMFOR-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 3° piso, C1428EHA, Buenos Aires, Argentina
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17
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Dastafkan K, Khajeh M, Ghaffari-Moghaddam M, Bohlooli M. Silver nanoparticles for separation and preconcentration processes. Trends Analyt Chem 2015. [DOI: 10.1016/j.trac.2014.08.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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18
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Silva DB, Rodrigues ED, da Silva GVJ, Lopes NP, de Oliveira DCR. Post-column sodiation to enhance the detection of polyacetylene glycosides in LC-DAD-MS analyses: an example from Bidens gardneri (Asteraceae). Talanta 2014; 135:87-93. [PMID: 25640130 DOI: 10.1016/j.talanta.2014.12.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2014] [Revised: 12/17/2014] [Accepted: 12/18/2014] [Indexed: 11/29/2022]
Abstract
The use of liquid chromatography-electrospray ionization-mass spectrometry (LC-ESI-MS) in dereplication studies of medicinal plants is a common strategy, but the analyses of polyacetylenes by LC-ESI-MS are little explored and require huge efforts, especially if there are low concentrations in the extracts. A post-column sodiation strategy was successfully applied to enhance the detection of polyacetylene glycosides. Their molecular formulae were proposed by HRESI, whereas the polyacetylene chromophores were determined by UV data. The use of acetic acid in the mobile phase was essential to obtain satisfactory chromatographic resolution, and only the addition of sodium chloride solution allowed good mass spectra, internal calibration and undoubtedly the molar mass determination of polyacetylenes. This new approach has allowed the identification of polyacetylene glycosides from Bidens gardneri extract, guiding the isolation procedures, and two new compounds were obtained. The structures of the isolated polyacetylenes have been confirmed by 1D and 2D NMR, HRMS.
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Affiliation(s)
- Denise Brentan Silva
- Núcleo de Pesquisas em Produtos Naturais e Sintéticos - NPPNS, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Avenida Bandeirantes 3900, 14040-903 Ribeirão Preto, SP, Brazil
| | - Edilene Delphino Rodrigues
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Avenida dos Bandeirantes 3900, 14040-901 Ribeirão Preto, SP, Brazil; Departamento de Química, Universidade Federal de Mato Grosso do Sul, CP 549, 79070-900 Campo Grande, MS, Brazil
| | - Gil Valdo José da Silva
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Avenida dos Bandeirantes 3900, 14040-901 Ribeirão Preto, SP, Brazil
| | - Norberto Peporine Lopes
- Núcleo de Pesquisas em Produtos Naturais e Sintéticos - NPPNS, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Avenida Bandeirantes 3900, 14040-903 Ribeirão Preto, SP, Brazil.
| | - Dionéia Camilo Rodrigues de Oliveira
- Núcleo de Pesquisas em Produtos Naturais e Sintéticos - NPPNS, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Avenida Bandeirantes 3900, 14040-903 Ribeirão Preto, SP, Brazil
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Kim SH, Cha EJ, Lee KM, Kim HJ, Kwon OS, Lee J. Simultaneous ionization and analysis of 84 anabolic androgenic steroids in human urine using liquid chromatography-silver ion coordination ionspray/triple-quadrupole mass spectrometry. Drug Test Anal 2014; 6:1174-85. [DOI: 10.1002/dta.1747] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Revised: 10/12/2014] [Accepted: 10/13/2014] [Indexed: 11/06/2022]
Affiliation(s)
- So-Hee Kim
- Doping Control Center; Korea Institute of Science and Technology; Hwarang-ro 14-gil 5, Seongbuk-gu Seoul 136-791 Korea
- Department of Chemistry, Research Institute for Natural Sciences; Korea University; 145, Anam-ro, Seongbuk-gu Seoul 136-701 Korea
| | - Eun-Ju Cha
- Doping Control Center; Korea Institute of Science and Technology; Hwarang-ro 14-gil 5, Seongbuk-gu Seoul 136-791 Korea
- Department of Chemistry, Research Institute for Natural Sciences; Korea University; 145, Anam-ro, Seongbuk-gu Seoul 136-701 Korea
| | - Kang Mi Lee
- Doping Control Center; Korea Institute of Science and Technology; Hwarang-ro 14-gil 5, Seongbuk-gu Seoul 136-791 Korea
| | - Ho Jun Kim
- Doping Control Center; Korea Institute of Science and Technology; Hwarang-ro 14-gil 5, Seongbuk-gu Seoul 136-791 Korea
| | - Oh-Seung Kwon
- Doping Control Center; Korea Institute of Science and Technology; Hwarang-ro 14-gil 5, Seongbuk-gu Seoul 136-791 Korea
| | - Jaeick Lee
- Doping Control Center; Korea Institute of Science and Technology; Hwarang-ro 14-gil 5, Seongbuk-gu Seoul 136-791 Korea
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20
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Wu Y, Guo C, Zhang N, Bian G, Jiang K. Rapid differentiation of ortho-, meta-, and para-isomers of halogenated phenylmethylidene hydrazinecarbodithioates by metal complexation and electrospray ionization mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2014; 28:2111-2120. [PMID: 25156601 DOI: 10.1002/rcm.6991] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Revised: 07/15/2014] [Accepted: 07/18/2014] [Indexed: 06/03/2023]
Abstract
RATIONALE Development of mass spectrometry (MS)-based methods for isomeric differentiation remains a challenging analytical task, and has attracted the interest of many research groups. It is relevant to develop a general method to differentiate the isomeric halogenated phenylmethylidene hydrazinecarbodithioates (MX, X = F, Cl, Br). METHODS Diluted CH3 CN solutions containing NiCl2 and a title isomer (MX) were analyzed by electrospray ionization tandem mass spectrometry (ESI-MS(n)) in a quadrupole ion trap instrument equipped with an ESI source. Theoretical calculations were performed using the density functional theory (DFT) method at the uB3LYP/6-31+G(2d,p) level. RESULTS In MS(3) experiments, the complex [MX + SCH3 + Ni](+) ion, resulting from dissociation of the ESI-generated complex [2MX - H + Ni](+) ion, undergoes ligand-exchange reactions with residual gas molecules, such as water, acetonitrile, and nitrogen in the ion trap, and the o-isomers [Mo-X + SCH3 + Ni](+) were found to undergo the characteristic HX elimination reactions to afford several unique ions. Each set of three isomers [MX + SCH3 + Ni](+) show significantly different reactivity, which has been corroborated by MS(4) experiments and theoretical calculations. CONCLUSIONS A rapid method based on metal complexation and tandem mass spectrometric (MS(n)) analysis has been developed to differentiate three sets of positional isomers of halogenated phenylmethylidene hydrazinecarbodithioates (MX, X = F, Cl, Br).
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Affiliation(s)
- Yanqing Wu
- Key Laboratory of Organosilicon Chemistry and Material Technology, Hangzhou Normal University, Hangzhou, 311121, P.R. China
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21
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Cirigliano AM, Cabrera GM. Differentiation of cyclosporin A from isocyclosporin A by liquid chromatography/electrospray ionization mass spectrometry with post-column addition of divalent metal salt. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2014; 28:465-470. [PMID: 24497284 DOI: 10.1002/rcm.6805] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Revised: 12/09/2013] [Accepted: 12/10/2013] [Indexed: 06/03/2023]
Abstract
RATIONALE Cyclosporin A (CsA) rearranges to its isomer isocyclosporin A (isoCsA) upon acid hydrolysis and also during ionization in the ion source of the mass spectrometer. It has been reported that both compounds could not be differentiated by tandem mass spectrometry (MS/MS) using atmospheric pressure ionization (API) sources and ambiguously differentiated by using other sources. In order to analyze these compounds which are common fungal metabolites, it is relevant to develop a simple method for their differentiation. METHODS CsA and isoCsA were analyzed by liquid chromatography/mass spectrometry (LC/MS) with post-column addition of metal ion solutions in a quadrupole time-of-flight instrument equipped with an electrospray ionization (ESI) source. RESULTS Mass spectra of CsA obtained upon post-column addition of solutions of Ca(II), Cu(II) and Zn(II) showed complexes between cyclosporin and the metal, including [2CsA + Me](2+) and [CsA-H + Me](+). These complexes were not observed in the spectra of isoCsA. The same results were observed at different metal concentrations. CONCLUSIONS Differentiation via metal complexation in positive ion mode LC/ESI-MS was performed to simultaneously distinguish CsA and its isomer isoCsA.
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Affiliation(s)
- Adriana M Cirigliano
- Departamento de Química Orgánica, UMyMFOR-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 3° piso, C1428EHA, Buenos Aires, Argentina
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22
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Sun H, Wang L, Pan Y. Gas-phase arylmethyl transfer and cyclodeamination of argentinated N-arylmethyl-pyridin-2-ylmethanimine. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2014; 25:169-175. [PMID: 24356863 DOI: 10.1007/s13361-013-0778-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2013] [Revised: 10/16/2013] [Accepted: 10/23/2013] [Indexed: 06/03/2023]
Abstract
In collisional activation of argentinated N-arylmethyl-pyridin-2-ylmethanimine, a neutral molecule of AgNH2 is eliminated, carrying one hydrogen from the methylene and the other one from the ortho position (relative to the ipso carbon) of the aryl ring. Taking argentinated N-benzyl-pyridin-2-ylmethanimine for example, the proposition that the AgNH2 loss results from intramolecular arylmethyl transfer combined with cyclodeamination is rationalized by deuterium labeling experiments, blocking experiments, and theoretical calculations. The structure of the final product ion from loss of AgNH2 was confirmed further by multistage mass spectrometry.
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Affiliation(s)
- Hezhi Sun
- Department of Chemistry, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
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23
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Ma C, Lv H, Zhang X, Chen Z, Shi J, Lu M, Lin Z. Identification of regioisomers of methylated kaempferol and quercetin by ultra high performance liquid chromatography quadrupole time-of-flight (UHPLC-QTOF) tandem mass spectrometry combined with diagnostic fragmentation pattern analysis. Anal Chim Acta 2013; 795:15-24. [PMID: 23998533 DOI: 10.1016/j.aca.2013.07.038] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Revised: 07/13/2013] [Accepted: 07/17/2013] [Indexed: 11/24/2022]
Abstract
The O-methylation of active flavonoids can enhance their antiallergic, anticancerous, and cardioprotective effects depending on the methylation position. Thus, it is biologically and pharmacologically important to differentiate methylated flavonoid regioisomers. In this study, we examined the regioisomers of methylated kaempferol and quercetin using ultra high performance liquid chromatography quadrupole time-of-flight tandem mass spectrometry. The methyl groups on the flavonoids can generally be cleaved as methyl radicals in a position-independent manner. We found that methyl groups can be cleaved as methane. If there are protons adjacent the methoxy on the flavonol rings, intra-molecule proton transfer can occur via collision-induced dissociation, and one molecule of methane can then be eliminated. The remaining charged fragment ([M+H-CH4](+)) reflects the adjacent structure and is specific to the methoxy position. Furthermore, the retro Diels-Alder (RDA) fragmentation of methylated flavonols can generate fragments with the methoxy at the original methylated ring. Combining the position-specific [M+H-CH4](+) fragment with the RDA fragments provides a diagnostic pattern for rapidly identifying methylated regioisomeric flavonols. Along with their retention behaviour, we have successfully identified ten regioisomers of methylated kaempferol and quercetin, which include six compounds previously reported in plants and shown to be biologically active. The developed approach is sensitive, rapid, reliable, and requires few standard compounds. It is highly efficient for characterising the specificity of novel flavonoid O-methyltransferases and can help direct enzymatic or chemical syntheses during the early stages of drug discovery. This method also has potential for use in identifying other methylated isomeric flavonoids.
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Affiliation(s)
- Chengying Ma
- Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, Zhejiang 310008, China
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24
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Niemeyer ED, Brodbelt JS. Regiospecificity of human UDP-glucuronosyltransferase isoforms in chalcone and flavanone glucuronidation determined by metal complexation and tandem mass spectrometry. JOURNAL OF NATURAL PRODUCTS 2013; 76:1121-32. [PMID: 23713759 PMCID: PMC3710688 DOI: 10.1021/np400195z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The glucuronidation of a series of chalcones (2'-hydroxychalcone, 2',4'-dihydroxychalcone, 3,2'-dihydroxychalcone, 4,2'-dihydroxychalcone, and cardamonin) and their corresponding cyclized flavanones (7-hydroxyflavanone, 3'-hydroxyflavanone, 4'-hydroxyflavanone, and alpinetin) by eight human UDP-glucuronosyltransferase (UGT) 1A enzymes was evaluated. A postcolumn metal complexation LC-MS/MS strategy was used successfully to produce characteristic mass spectrometric product ions that were utilized in combination with elution order trends to identify chalcone and flavanone monoglucuronides unambiguously, thus allowing determination of the regioselectivities of the UGT1A isoforms. The presence of hydroxy groups on the A- or B-ring had a significant effect on the glucuronide product yield and the site where glucuronidation occurred. For example, for reaction with UGT1A9, formation of the 2'-O-glucuronide was increased for dihydroxychalcones with A-ring hydroxy substituents. In contrast, although UGT1A8 reacted with 3,2'-dihydroxychalcone and 4,2'-dihydroxychalcone to yield 2'-O-glucuronide products, the presence of a B-ring hydroxy group at the 4' position on cardamonin and 2',4'-dihydroxychalcone quenched the reaction at the OH-2' position. Moreover, the A-ring OH-4 group promoted glucuronidation at the 2' position for the reaction of 4,2'-dihydroxychalcone with UGT1A1 and 1A3. For UGT1A7, hydroxy group substituents on the chalcone A-ring also promoted cyclization and formation of the corresponding flavanone glucuronide.
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Affiliation(s)
- Emily D Niemeyer
- Department of Chemistry and Biochemistry, Southwestern University, Georgetown, Texas 78626, USA.
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25
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Zhou WJ, Song JZ, Fu WW, Tan HS, Bian ZX, Xu HX. Chemical comparison of two dosage forms of Hemp Seed Pills by UHPLC-Q-ToF-MS/MS and multivariate statistical techniques. J Pharm Biomed Anal 2013; 84:59-68. [PMID: 23807000 DOI: 10.1016/j.jpba.2013.05.034] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2013] [Revised: 05/20/2013] [Accepted: 05/22/2013] [Indexed: 11/18/2022]
Abstract
Hemp seed soft gel capsule (HSSGC) is a modernised dosage form that is derived from a traditional Chinese patent medicine, Hemp Seed Pills (HSP). Two dosage forms claim the same therapeutic effects; however, their chemical components and chemical equivalency are unclear. In the present study, an ultra performance liquid chromatography coupled with time-of-flight mass spectrometry (UHPLC-ToF-MS)-based chemical profiling approach was proposed to rapidly evaluate the chemical differences between HSP and HSSGC as model dosage forms. Samples of the two dosage forms were subjected to UHPLC-ToF-MS analysis. The datasets of retention time (TR) and mass-to-charge ratio (m/z) pairs, ion intensities and sample codes were processed with principal component analysis (PCA) and partial least squares discriminate analysis (PLS-DA) to holistically compare the difference between these two dosage form samples. A clear classification trend was observed in the score plot, and a loading bi-plot was generated in which the variables are correlated with the group and the samples that were observed. The important chemical components that caused differences among the samples were explored with a Variables Importance Projection (VIP) index. Using the proposed approach, global chemical differences were found between the two dosage forms and among samples of the same dosage form. The most important components that are related to the differences were identified and most of them were attributed to Fructus Aurantii Immaturus. It is suggested that this newly established approach could be used for pre-clinical trial chemical equivalence study or the quality evaluation of the traditional medicinal products with large variations in quality.
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Affiliation(s)
- Wen-Jun Zhou
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
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26
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Robotham SA, Brodbelt JS. Identification of flavone glucuronide isomers by metal complexation and tandem mass spectrometry: regioselectivity of uridine 5'-diphosphate-glucuronosyltransferase isozymes in the biotransformation of flavones. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:1457-63. [PMID: 23362992 PMCID: PMC3578006 DOI: 10.1021/jf304853j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Flavone glucuronide isomers of five flavones (chrysin, apigenin, luteolin, baicalein, and scutellarein) were differentiated by collision-induced dissociation of [Co(II) (flavone-H) (4,7-diphenyl-1,10-phenanthroline)(2)](+) complexes. The complexes were generated via postcolumn addition of a metal-ligand solution after separation of the glucuronide products generated upon incubation of each flavone with an array of uridine 5'-diphosphate (UDP)-glucuronosyltransferase (UGT) isozymes. Elucidation of the glucuronide isomers allowed a systematic investigation of the regioselectivity of 12 human UGT isozymes, including 8 UGT1A and 4 UGT2B isozymes. Glucuronidation of the 7-OH position was the preferred site for all the flavones except for luteolin, which possessed adjacent hydroxyl groups on the B ring. For all flavones and UGT isozymes, glucuronidation of the 5-OH position was never observed. As confirmed by the metal complexation/MS/MS strategy, glucuronidation of the 6-OH position only occurred for baicalein and scutellarein when incubated with three of the UGT isozymes.
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Yu Q, Yu B, Yang H, Li X, Liu S. Silver (Ι)-assisted enantiomeric analysis of ginsenosides using electrospray ionization tandem mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2012; 47:1313-1321. [PMID: 23019162 DOI: 10.1002/jms.3085] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
For identification of ginsenoside enantiomers, electrospray ionization mass spectrometry (ESI-MS) was used to generate silver complexes of the type [ginsenoside + Ag](+). Collision induced dissociation of the silver-ginsenoside complexes produced fragment ions by dehydration, allowing differentiation of ginsenoside enantiomers by the intensity of [M + Ag - H(2)O](+) ion. In the meanwhile, an approach based on the distinct profiles of enantiomer-selective fragment ion intensity varied with collision energy was introduced to refine the identification and quantitation of ginsenoside enantiomers. Five pairs of enantiomeric ginsenosides were distinguished and quantified on the basis of the distribution of fragment ion [M + Ag - H(2)O](+). This method was also extended to the identification of other type of ginsenoside isomers such as ginsenoside Rb2 and Rb3. For demonstrating the practicability of this novel approach, it was utilized to analyze the molar ratio of 20-(S) and 20-(R) type enantiomeric ginsenosides in enantiomer mixture in red ginseng extract. The generation of characteristic fragment ion [M + Ag - H(2)O](+) likely results from the reduction of potential energy barrier of dehydration because of the catalysis of silver ion. The mechanism of enantiomer identification of ginsenosides was discussed from the aspects of computational modeling and internal energy.
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Affiliation(s)
- Qing Yu
- Changchun Center of Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
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28
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Wang K, Groom M, Sheridan R, Zhang S, Block E. Liquid sulfur as a reagent: synthesis of polysulfanes with 20 or more sulfur atoms with characterization by UPLC-(Ag+)-coordination ion spray-MS. J Sulphur Chem 2012. [DOI: 10.1080/17415993.2012.721368] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Kai Wang
- a Department of Chemistry , University at Albany, SUNY , Albany , NY , 12222 , USA
| | - Murree Groom
- b ECOspray Limited , Grange Farm, Hilborough, Norfolk , IP26 5BT , UK
| | - Robert Sheridan
- c NYS Department of Agriculture and Markets , Food Laboratory Division , Albany , NY , 12235 , USA
| | - Shaozhong Zhang
- a Department of Chemistry , University at Albany, SUNY , Albany , NY , 12222 , USA
| | - Eric Block
- a Department of Chemistry , University at Albany, SUNY , Albany , NY , 12222 , USA
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Johnson BS, Burinsky DJ, Burova SA, Davis R, Fitzgerald RN, Matsuoka RT. Novel product ions of 2-aminoanilide and benzimidazole Ag(I) complexes using electrospray ionization with multi-stage tandem mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2012; 26:1115-1122. [PMID: 22467462 DOI: 10.1002/rcm.6210] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
RATIONALE The 2-aminoaniline scaffold is of significant value to the pharmaceutical industry and is embedded in a number of pharmacophores including 2-aminoanilides and benzimidazoles. A novel application of coordination ion spray mass spectrometry (CIS-MS) for interrogating the silver ion (Ag(+)) complexes of a homologous series of these compounds using multi-stage tandem mass spectrometry is described. Unlike the ubiquitous alkali metal ion complexes, Ag(+) complexes of 2-aminoanilides and benzimidazoles were found to yield [M - H](+) ions in significant abundance via gas-phase elimination of the metal hydride (AgH) resulting in unique product ion cascades. METHODS Sample introduction was by liquid chromatography with mass spectrometry analysis performed on a hybrid linear ion trap/orbitrap instrument capable of high-resolution measurements. RESULTS Rigorous structural characterization by multi-stage tandem mass spectrometry using [M + H](+), [M - H](-) and [M - H](+) precursor ions derived from ESI and CIS experiments was performed for the homologous series of 2-aminoanilide and benzimidazole compounds. A full tabular comparison of structural information resulting from these product ion cascades was produced. CONCLUSIONS Multi-stage tandem mass spectrometry of [M - H](+) ions resulting from Ag(+) complexes of 2-aminoanilides and benzimidazoles in CIS-MS experiments produced unique product ion cascades that exhibited complementary structural information to that obtained from tandem mass spectrometry of [M + H](+) and [M - H](-) ions by electrospray ionization (ESI). These observations may be broadly applicable to other compounds that are observed to form Ag(+) complexes and eliminate AgH.
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Affiliation(s)
- Byron S Johnson
- GlaxoSmithKline, 5 Moore Drive, Research Triangle Park, NC 27709-3398, USA.
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Robotham SA, Brodbelt JS. Regioselectivity of human UDP-glucuronosyltransferase isozymes in flavonoid biotransformation by metal complexation and tandem mass spectrometry. Biochem Pharmacol 2011; 82:1764-70. [PMID: 21889496 DOI: 10.1016/j.bcp.2011.08.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2011] [Revised: 08/13/2011] [Accepted: 08/15/2011] [Indexed: 11/28/2022]
Abstract
Based on reactions with five flavonoids, the regioselectivities of twelve human UDP-glucuronosyltransferase (UGT) isozymes were elucidated. The various flavonoid glucuronides were differentiated based on LC-MS/MS fragmentation patterns of [Co(II)(flavonoid-H)(4,7-diphenyl-1,10-phenanthroline)(2)](+) complexes generated upon post-column complexation. Glucuronide distributions were evaluated to allow a systematic assessment of the regioselectivity of each isozyme. The various UGT enzymes, including eight UGT1A and four UGT2B, displayed a remarkable range of selectivities, both in terms of the positions of glucuronidation and relative reactivity with flavanones versus flavonols.
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Affiliation(s)
- Scott A Robotham
- Department of Chemistry and Biochemistry, University of Texas at Austin, 1 University Station A5300, Austin, TX 78712, USA
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31
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Gao X, Hu X, Zhu J, Zeng Z, Han D, Tang G, Huang X, Xu P, Zhao Y. An isotope (18O, 15N, and 2H) technique to investigate the metal ion interactions between the phosphoryl group and amino acid side chains by electrospray ionization mass spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2011; 22:689-702. [PMID: 21472608 DOI: 10.1007/s13361-010-0069-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2010] [Revised: 12/24/2010] [Accepted: 12/28/2010] [Indexed: 05/30/2023]
Abstract
Cationic metal ion-coordinated N-diisopropyloxyphosphoryl dipeptides (DIPP-dipeptides) were analyzed by electrospray ionization multistage tandem mass spectrometry (ESI-MS(n)). Two novel rearrangement reactions with hydroxyl oxygen or carbonyl oxygen migrations were observed in ESI-MS/MS of the metallic adducts of DIPP-dipeptides, but not for the corresponding protonated DIPP-dipeptides. The possible oxygen migration mechanisms were elucidated through a combination of MS/MS experiments, isotope ((18)O, (15)N, and (2)H) labeling, accurate mass measurements, and density functional theory (DFT) calculations at the B3LYP/6-31 G(d) level. It was found that lithium and sodium cations catalyze the carbonyl oxygen migration more efficiently than does potassium and participation through a cyclic phosphoryl intermediate. In addition, dipeptides having a C-terminal hydroxyl or aromatic amino acid residue show a more favorable rearrangement through carbonyl oxygen migration, which may be due to metal cation stabilization by the donation of lone pair of the hydroxyl oxygen or aromatic π-electrons of the C-terminal amino acid residue, respectively. It was further shown that the metal ions, namely lithium, sodium, and potassium cations, could play a novel directing role for the migration of hydroxyl or carbonyl oxygen in the gas phase. This discovery suggests that interactions between phosphorylated biomolecules and proteins might involve the assistance of metal ions to coordinate the phosphoryl oxygen and protein side chains to achieve molecular recognition.
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Affiliation(s)
- Xiang Gao
- Department of Chemistry and The Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
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Cheng L, Shen LM, Zhang M, Li N, Li X, Ma ZJ, Qu HB. Eleven New Triterpenes from Eurycorymbus cavaleriei. Helv Chim Acta 2010. [DOI: 10.1002/hlca.201000131] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Mass Spectrometry as a Powerful Analytical Technique for the Structural Characterization of Synthesized and Natural Products. ACTA ACUST UNITED AC 2010. [DOI: 10.1007/978-90-481-9815-3_20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
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Stobiecki M, Staszków A, Piasecka A, Garcia-Lopez PM, Zamora-Natera F, Kachlicki P. LC-MSMS profiling of flavonoid conjugates in wild Mexican lupine, Lupinus reflexus. JOURNAL OF NATURAL PRODUCTS 2010; 73:1254-1260. [PMID: 20568784 DOI: 10.1021/np100139d] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Profiles of flavonoid conjugates present in the root and leaf tissues of the Mexican wild lupine, Lupinus reflexus, were established using two LC-MSMS systems in the positive and negative ion modes. The ion trap mass spectrometer and quadrupole time-of flight instrument provided sequential MS(n) spectra and MSMS spectra with accurate m/z values of [M + H](+) and [M - H] (-) ions, respectively. Sixty-two flavone and isoflavone glycoconjugates were found and tentatively identified. Numerous isomeric or isobaric compounds with the same molecular mass could be differentiated. Isomeric di- and mono glucosides of biochanin A, genistein, 2'-hydroxygenistein, luteone, and 2,3-didehydrokievitone were distinguished on the basis of relative abundances of product ions. The studied flavonoid glycoconjugates were acylated with dicarboxylic aliphatic acids and their methyl esters at either the aglycone or glycosidic moiety.
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Affiliation(s)
- Maciej Stobiecki
- Institute of Bioorganic Chemistry PAS, Noskowskiego 12/14, Poznan, Poland
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Abad-García B, Garmón-Lobato S, Berrueta LA, Gallo B, Vicente F. Practical guidelines for characterization of O-diglycosyl flavonoid isomers by triple quadrupole MS and their applications for identification of some fruit juices flavonoids. JOURNAL OF MASS SPECTROMETRY : JMS 2009; 44:1017-1025. [PMID: 19283783 DOI: 10.1002/jms.1573] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Fifteen flavonoid O-diglycosides with different interglycosidic linkage isomery and glycosylation position have been studied in order to analyze their fragmentation patterns. Initial separation was carried out using high performance liquid chromatography with diode array detection (HPLC/DAD) coupled to an electrospray ionization (ESI) interface and a triple quadrupole mass spectrometer. Some useful differences in their MS spectra have been found and discussed. As it has already been reported, [Y*]+/[Y0]+ ratio for flavanones and [Y1]+/[Y0]+ ratio for other flavonoids is specific for each isomeric interglycosidic linkage. In this work it has also been observed that the abundance of these ions is dependent on the position of glycosylation. On the basis of these differences, systematic guidelines for our experimental conditions have been proposed for the differentiation of not only isomeric interglycosidic linkage but also glycosylation position using collision-induced dissociation MS/MS (CID-MS/MS) spectra in positive mode. These results have been successfully applied for the characterization of three diglycosyl flavonoids found in Citrus fruit juices and these conclusions have also been extrapolated for characterizing two triglycosides in the same fruits.
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Affiliation(s)
- B Abad-García
- Departamento de Química Analítica, Facultad de Ciencia y Tecnología, Universidad del País Vasco/Euskal Herriko Unibertsitatea, P.O. Box 644, 48080 Bilbao, Spain
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March R, Brodbelt J. Analysis of flavonoids: tandem mass spectrometry, computational methods, and NMR. JOURNAL OF MASS SPECTROMETRY : JMS 2008; 43:1581-1617. [PMID: 18855332 DOI: 10.1002/jms.1480] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Due to the increasing understanding of the health benefits and chemopreventive properties of flavonoids, there continues to be significant effort dedicated to improved analytical methods for characterizing the structures of flavonoids and monitoring their levels in fruits and vegetables, as well as developing new approaches for mapping the interactions of flavonoids with biological molecules. Tandem mass spectrometry (MS/MS), particularly in conjunction with liquid chromatography (LC), is the dominant technique that has been pursued for elucidation of flavonoids. Metal complexation strategies have proven to be especially promising for enhancing the ionization of flavonoids and yielding key diagnostic product ions for differentiation of isomers. Of particular value is the addition of a chromophoric ligand to allow the application of infrared (IR) multiphoton dissociation as an alternative to collision-induced dissociation (CID) for the differentiation of isomers. CID, including energy-resolved methods, and nuclear magnetic resonance (NMR) have also been utilized widely for structural characterization of numerous classes of flavonoids and development of structure/activity relationships.The gas-phase ion chemistry of flavonoids is an active area of research particularly when combined with accurate mass measurement for distinguishing between isobaric ions. Applications of a variety of ab initio and chemical computation methods to the study of flavonoids have been reported, and the results of computations of ion and molecular structures have been shown together with computations of atomic charges and ion fragmentation. Unambiguous ion structures are obtained rarely using MS alone. Thus, it is necessary to combine MS with spectroscopic techniques such as ultraviolet (UV) and NMR to achieve this objective. The application of NMR data to the mass spectrometric examination of flavonoids is discussed.
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Affiliation(s)
- Raymond March
- Department of Chemistry, Trent University, Ontario, Canada.
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Cheng L, Zhang M, Zhang P, Song Z, Ma Z, Qu H. Silver complexation and tandem mass spectrometry for differentiation of triterpenoid saponins from the roots of Pulsatilla chinensis (Bunge) Regel. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2008; 22:3783-3790. [PMID: 18973198 DOI: 10.1002/rcm.3801] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
For detection and differentiation of two types of triterpenoid saponins based on different aglycons of the lupane and oleanane skeleton from the roots of Pulsatilla chinensis (Bunge) Regel, the silver ion was introduced and electrospray ionization multi-stage tandem mass spectrometry was applied to analyze eleven triterpenoid saponin silver complexes. The quasi-molecular ion [M+Ag](+) was observed in the full-scan MS spectra of all the silver complexes. The MS(2) data of the [M+Ag](+) ion provided structural information on the sugar sequence of the oligosaccharide chains and the aglycon of the saponins. There are two patterns in the cleavage pathway of oleanane-type saponins. One is elimination of the sugar chain and subsequent loss of the carboxylic group which is the same as the cleavage of lupine-type saponins. The other is loss of the distinguishing ions at m/z 72 and 28 (C(2)H(4)) followed by loss of the carboxylic group. Diagnostic fragmentation pathways of the silver complexes of the saponins allow successful identification of the two types of saponins from the roots of Pulsatilla chinensis (Bunge) Regel.
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Affiliation(s)
- Lin Cheng
- Institute of Pharmaceutical Informatics, School of Pharmaceutical Sciences of Zhejiang University, Hangzhou 310058, China
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Sherrod SD, Diaz AJ, Russell WK, Cremer PS, Russell DH. Silver Nanoparticles as Selective Ionization Probes for Analysis of Olefins by Mass Spectrometry. Anal Chem 2008; 80:6796-9. [DOI: 10.1021/ac800904g] [Citation(s) in RCA: 112] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Stacy D. Sherrod
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77843
| | - Arnaldo J. Diaz
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77843
| | - William K. Russell
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77843
| | - Paul S. Cremer
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77843
| | - David H. Russell
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77843
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Kachlicki P, Einhorn J, Muth D, Kerhoas L, Stobiecki M. Evaluation of glycosylation and malonylation patterns in flavonoid glycosides during LC/MS/MS metabolite profiling. JOURNAL OF MASS SPECTROMETRY : JMS 2008; 43:572-586. [PMID: 18074333 DOI: 10.1002/jms.1344] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Flavonoid conjugates constitute several classes of plant phenolic secondary metabolites including many isomeric compounds differing in the hydroxylation pattern and substitution of their rings with different groups such as alkyls, acyls or sugars. These compounds occur in plant tissues mainly as glycosides and in many cases it is necessary to have reliable and detailed information concerning the structure of these natural products. Our results were obtained using leaf extracts of Arabidopsis thaliana and Lupinus angustifolius in which different glycosides of flavones, flavonols and isoflavones are present. Analysis of collision-induced dissociation (CID)/MS/MS spectra of protonated [M + H](+), sodiated [M + Na](+) or deprotonated [M - H](-) molecules recorded during HPLC runs may bring needed information in this respect. However, registration of mass spectra of [M + Na](+) ions with a good efficiency is possible only after post-column addition of a sodium acetate solution to the LC column eluate. The retention of sodium cation on the saccharidic parts of the molecule is observed after the CID fragmentation. In many cases, the location of this cation on the glycan attached to C-3 hydroxyl group of flavonol led to assignment of its structure. Additionally, the determination of the structure of the aglycone and of the sequence of the glycan part was made possible through the CID data obtained from the [M + H](+) and [M - H](-) ions. CID spectra show a different order of sugar elimination from hydroxyl groups at C-3 and C-7 in flavonol glycosides isolated from A. thaliana leaves and give sufficient information to discriminate flavonoid O-diglycosides from flavonoid di-O-glycosides.
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Affiliation(s)
- P Kachlicki
- Institute of Plant Genetics PAS, Strzeszyńska 34, Poznań, Poland
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Davis BD, Brodbelt JS. Regioselectivity of human UDP-glucuronosyl-transferase 1A1 in the synthesis of flavonoid glucuronides determined by metal complexation and tandem mass spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2008; 19:246-56. [PMID: 18083528 PMCID: PMC2277483 DOI: 10.1016/j.jasms.2007.11.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2007] [Revised: 11/12/2007] [Accepted: 11/12/2007] [Indexed: 05/13/2023]
Abstract
A three-part tandem mass spectrometric strategy that entails MSn analysis and a post-column LC-MS cobalt complexation method is developed to identify flavonoid monoglucuronide metabolites synthesized using the 1A1 isozyme of human UDP-glucuronosyltransferase (UGT). Ten flavonoid aglycons were used as substrates, spanning the subclasses of flavones, flavonols, and flavanones. The products were characterized by LC-MS and LC-MSn, with post-column cobalt complexation employed to pinpoint the specific sites of conjugation. The dissociation of complexes of the form [Co(II) (flavonoid glucuronide - H) (4,7-diphenyl-1,10-phenanthroline)(2)]+ allowed identification of the products and differentiation of isomers. The correlation between glycosylation site and elution order is used to provide additional structural confirmation. Flavonoids lacking a 3' hydroxyl group were glucuronidated only at position 7, while those containing this functionality also formed 3'-O-glucuronides and sometimes 4'-O-glucuronides, thus supporting the conclusion that the presence or absence of the 3'-OH group is the major determinant of the regioselectivity of glucuronidation. Moreover, the specific distribution of multiple glucuronide products (7-O, 3'-O, 4'-O) is governed by the subclass of flavonoid.
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Affiliation(s)
| | - Jennifer S Brodbelt
- *Address reprint requests to: Dr. Jennifer S. Brodbelt, Department of Chemistry and Biochemistry, The University of Texas at Austin, 1 University Station A5300, Austin, TX 78712, Phone: (512) 471-0028, Fax: (512) 471-8696,
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Firdoussi AE, Lafitte M, Tortajada J, Kone O, Salpin JY. Characterization of the glycosidic linkage of underivatized disaccharides by interaction with Pb(2+) ions. JOURNAL OF MASS SPECTROMETRY : JMS 2007; 42:999-1011. [PMID: 17567836 DOI: 10.1002/jms.1220] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Electrospray ionization in combination with tandem mass spectrometry and lead cationization is used to characterize the linkage position of underivatized disaccharides. Lead(II) ions react mainly with disaccharides by proton abstraction to generate [Pb(disaccharide)(m)-H](+) ions (m = 1-2). At low cone voltages, an intense series of doubly charged ions of general formula [Pb(disaccharide)(n)](2+) are also observed. Our study shows that MS/MS experiments have to be performed to differentiate Pb(2+)-coordinated disaccharides. Upon collision, [Pb(disaccharide)-H](+) species mainly dissociate according to glycosidic bond cleavage and cross-ring cleavages, leading to the elimination of C(n)H(2n)O(n) neutrals (n = 2-4). The various fragmentation processes allow the position of the glycosidic bond to be unambiguously located. Distinction between glc-glc and glc-fru disaccharides also appears straightforward. Furthermore, for homodimers of D-glucose our data demonstrate that the anomericity of the glycosidic bond can be characterized for the 1 --> n linkages (n = 2, 4, 6). Consequently, Pb(2+) cationization combined with tandem mass spectrometry appears particularly useful to identify underivatized disaccharides.
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Affiliation(s)
- Ahlam El Firdoussi
- Université d'Evry Val d'Essonne--Laboratoire Analyse et Modélisation pour la Biologie et l'Environnement, CNRS, Bâtiment Maupertuis, Boulevard François Mitterrand, 91025 EVRY, France
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Shi P, He Q, Song Y, Qu H, Cheng Y. Characterization and identification of isomeric flavonoid O-diglycosides from genus Citrus in negative electrospray ionization by ion trap mass spectrometry and time-of-flight mass spectrometry. Anal Chim Acta 2007; 598:110-8. [PMID: 17693314 DOI: 10.1016/j.aca.2007.07.027] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2007] [Revised: 07/11/2007] [Accepted: 07/11/2007] [Indexed: 10/23/2022]
Abstract
Flavonoid O-diglycosides are important bioactive compounds from genus Citrus. They often occur as isomers, which makes the structural elucidation difficult. In the present study, the fragmentation behavior of six flavonoid O-diglycosides from genus Citrus was investigated using ion trap mass spectrometry in negative electrospray ionization (ESI) with loop injection. For the flavonoid O-rutinosides, [M-H-308]- ion was typically observed in the MS2 spectrum, suggesting the loss of a rutinose. The fragmentation patterns of flavonoid O-neohesperidosides were more complicated in comparison with their rutinoside analogues. A major difference was found in the [M-H-120]- ion in the MS2 spectrum, which was a common feature of all the flavonoid O-neohesperidosides. The previous literature for naringin located the loss of 120Da to the glycan part, whereas the present study for naringin had shown that the [M-H-120]- ion was produced by a retro-Diels-Alder reaction in ring C, and this fragmentation pattern was confirmed by the accurate mass measurement using an orthogonal time-of-flight mass spectrometer. Combined with high performance liquid chromatography (HPLC) and diode array detection (DAD), the established approach to the structural identification of flavonoid O-diglycosides by ion trap mass spectrometry was applied to the analysis of extracts of two Chinese medicines derived from genus Citrus, namely Fructus aurantii and F. aurantii immaturus. According to the HPLC retention behavior, the diagnostic UV spectra and the molecular structural information provided by multistage mass spectrometry (MS(n)) spectra, 13 flavonoid O-glycosides in F. aurantii and 12 flavonoid O-glycosides in F. a. immaturus were identified rapidly.
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Affiliation(s)
- Peiying Shi
- Pharmaceutical Informatics Institute, Zhejiang University, Hangzhou 310027, PR China
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Pikulski M, Aguilar A, Brodbelt JS. Tunable transition metal-ligand complexation for enhanced elucidation of flavonoid diglycosides by electrospray ionization mass spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2007; 18:422-31. [PMID: 17112735 DOI: 10.1016/j.jasms.2006.10.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2006] [Revised: 10/12/2006] [Accepted: 10/12/2006] [Indexed: 05/12/2023]
Abstract
A tunable ESI-MS/MS strategy for differentiation of flavone and flavanone diglycoside isomers based on metal complexation with auxiliary ligands is reported. The addition of a metal salt and an auxiliary ligand to a flavonoid solution results in the formation of [M(II) (flavonoid-H) auxiliary ligand](+) complexes, where M(II) is a transition metal. A series of auxiliary ligands with electron-withdrawing substituents were synthesized to tailor the relative metal binding affinities of the ligands and thus directly influence the stabilities, and consequently the dissociation pathways, of the complexes. Upon collisionally activated dissociation, the complexes yield fragmentation patterns in which the abundances of key diagnostic ions are enhanced, thus facilitating isomer differentiation.
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Affiliation(s)
- Michael Pikulski
- Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712-0165, USA
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Yin H, Porter NA. Identification of Intact Lipid Peroxides by Ag+ Coordination Ion‐Spray Mass Spectrometry (CIS‐MS). Methods Enzymol 2007; 433:193-211. [DOI: 10.1016/s0076-6879(07)33011-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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45
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Davis BD, Needs PW, Kroon PA, Brodbelt JS. Identification of isomeric flavonoid glucuronides in urine and plasma by metal complexation and LC-ESI-MS/MS. JOURNAL OF MASS SPECTROMETRY : JMS 2006; 41:911-20. [PMID: 16810646 DOI: 10.1002/jms.1050] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Noncovalent complexes were used for structural determination and isomer differentiation of flavonoid glucuronides. Several flavonoid glucuronides including naringenin-7-O-glucuronide, synthesized here for the first time, were used as test compounds. Electrospray ionization quadrupole ion trap mass spectrometry with collision-induced dissociation (CID) was used to analyze complexes of the form [Co(II) (L-H) (Aux)]+ and [Co(II) (L-H) (Aux)2]+, in which L is the flavonoid glucuronide and Aux is a phenanthroline-based ligand. These complexes yielded characteristic fragmentation patterns that facilitated assignment of the substitution position of the glucuronides. The methods were adapted to liquid chromatography/tandem mass spectrometry (LC-MS/MS) with postcolumn cobalt complexation and were tested on extracts from biological fluids. The metabolites naringenin-7-O-glucuronide and naringenin-4'-O-glucuronide were detected in human urine following the consumption of grapefruit juice. Isomeric quercetin glucuronides were identified and differentiated after spiking rat plasma at the 1 microM level, proving that the new methods are effective at biologically relevant concentrations.
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Affiliation(s)
- Barry D Davis
- Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, TX 78712, USA
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Clowers BH, Hill HH. Influence of cation adduction on the separation characteristics of flavonoid diglycoside isomers using dual gate-ion mobility-quadrupole ion trap mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2006; 41:339-51. [PMID: 16498610 DOI: 10.1002/jms.994] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
An electrospray ionization-dual gate-ion mobility-quadrupole ion trap mass spectrometer was used to evaluate the separation characteristics of isomeric flavonoid diglycosides adducted with sodium, potassium, and silver. This instrumental configuration allows ions to be selectively accumulated within the ion trap on the basis of their gas phase conformation prior to mass analysis. For the metal cations examined, silver produced the most compact adducts with flavonoid diglycosides. Listed in order of increasing size, the trend of flavonoid diglycoside ion-neutral cross sections adducted with Na+, K+, and Ag+ was narirutin < naringin < hesperidin < neohesperidin < rutin. To examine the separation contribution of the carbohydrate group, hesperetin, the aglycone of hesperidin, and neohesperin were compared to quercetin, the aglycone of rutin. Separation of the flavonoid diglycosides indicated that quercetin-derived diglycosides drifted longer than their hesperetin-derived isomers. Combined with the observed collision assisted dissociation (CAD) data, these findings suggest that carbohydrate moiety plays a significant role in both the separation and metal chelating characteristics of flavonoid diglycosides.
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Affiliation(s)
- Brian H Clowers
- Department of Chemistry, Washington State University, Pullman, WA 99164, USA
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48
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Lyapchenko N, Schroeder G. Energy-resolved in-source collisionally induced dissociation for the evaluation of the relative stability of noncovalent complexes in the gas phase. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2005; 19:3517-22. [PMID: 16261656 DOI: 10.1002/rcm.2212] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Energy-resolved in-source collisionally induced dissociation (CID) studies on the complexation of alkali metal cations by some crown ethers, nucleic acid bases, and amino acids have been performed. It has been shown that the cone voltage corresponding to the maximum ion abundance (V(c,Imax)) of the breakdown curve is characteristic of a given ion and not influenced by the cone desolvation process or the composition of the solution. Very good agreement of the V(c,Imax) value with the bond strength of the ion has been observed. Determination of the V(c,Imax) values for different ionic species is a useful, simple, and inexpensive way to obtain their relative stabilities in in-source CID conditions.
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Affiliation(s)
- Nataliya Lyapchenko
- Department of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland.
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