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Sykłowska-Baranek K, Gaweł M, Kuźma Ł, Wileńska B, Kawka M, Jeziorek M, Graikou K, Chinou I, Szyszko E, Stępień P, Zakrzewski P, Pietrosiuk A. Rindera graeca (A. DC.) Boiss. & Heldr. (Boraginaceae) In Vitro Cultures Targeting Lithospermic Acid B and Rosmarinic Acid Production. Molecules 2023; 28:4880. [PMID: 37375435 DOI: 10.3390/molecules28124880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 06/15/2023] [Accepted: 06/16/2023] [Indexed: 06/29/2023] Open
Abstract
The in vitro cultures of Rindera graeca, a rare endemic plant, were developed as a sustainable source of phenolic acids. Various shoot and root cultures were established and scaled up in a sprinkle bioreactor. A multiplication rate of 7.2 shoots per explant was achieved. HPLC-PDA-ESI-HRMS analysis revealed the presence of rosmarinic acid (RA) and lithospermic acid B (LAB) as the main secondary metabolites in both the shoot and root cultures. The maximum RA (30.0 ± 3.2 mg/g DW) and LAB (49.3 ± 15.5 mg/g DW) yields were determined in root-regenerated shoots. The strongest free radical scavenging activity (87.4 ± 1.1%), according to 2,2-diphenyl-1-picrylhydrazyl-hydrate assay, was noted for roots cultivated in a DCR medium. The highest reducing power (2.3 µM ± 0.4 TE/g DW), determined by the ferric-reducing antioxidant power assay, was noted for shoots cultivated on an SH medium containing 0.5 mg/L 6-benzylaminopurine. A genetic analysis performed using random amplified polymorphic DNA and start codon targeted markers revealed genetic variation of 62.8% to 96.5% among the investigated shoots and roots. This variability reflects the capacity of cultivated shoots and roots to produce phenolic compounds.
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Affiliation(s)
- Katarzyna Sykłowska-Baranek
- Department of Pharmaceutical Biology, Faculty of Pharmacy, Medical University of Warsaw, 1 Banacha St., 02-097 Warsaw, Poland
| | - Małgorzata Gaweł
- Department of Pharmaceutical Biology, Faculty of Pharmacy, Medical University of Warsaw, 1 Banacha St., 02-097 Warsaw, Poland
| | - Łukasz Kuźma
- Department of Biology and Pharmaceutical Botany, Faculty of Pharmacy, Medical University of Łódź, 1 Muszyńskiego, 90-151 Łódź, Poland
| | - Beata Wileńska
- Faculty of Chemistry, University of Warsaw, 1 Pasteura St., 02-093 Warsaw, Poland
- Biological and Chemical Research Centre, 101 Żwirki i Wigury St., 02-097 Warsaw, Poland
| | - Mateusz Kawka
- Department of Pharmaceutical Biology, Faculty of Pharmacy, Medical University of Warsaw, 1 Banacha St., 02-097 Warsaw, Poland
| | - Małgorzata Jeziorek
- Department of Pharmaceutical Biology, Faculty of Pharmacy, Medical University of Warsaw, 1 Banacha St., 02-097 Warsaw, Poland
| | - Konstantia Graikou
- Laboratory of Pharmacognosy and Chemistry of Natural Products, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis, 15771 Athens, Greece
| | - Ioanna Chinou
- Laboratory of Pharmacognosy and Chemistry of Natural Products, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis, 15771 Athens, Greece
| | - Ewa Szyszko
- Department of Pharmaceutical Biology, Faculty of Pharmacy, Medical University of Warsaw, 1 Banacha St., 02-097 Warsaw, Poland
| | - Piotr Stępień
- Department of Pharmaceutical Biology, Faculty of Pharmacy, Medical University of Warsaw, 1 Banacha St., 02-097 Warsaw, Poland
| | - Patryk Zakrzewski
- Department of Pharmaceutical Biology, Faculty of Pharmacy, Medical University of Warsaw, 1 Banacha St., 02-097 Warsaw, Poland
| | - Agnieszka Pietrosiuk
- Department of Pharmaceutical Biology, Faculty of Pharmacy, Medical University of Warsaw, 1 Banacha St., 02-097 Warsaw, Poland
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Masłowska K, Halik P, Tymecka D, Witkowska E, Wileńska B, Misicka A, Gniazdowska E. Radiolabeled peptidomimetic inhibitors of the VEGF:NRP-1 complex as diagnostic: therapeutic radiopharmaceuticals. Nucl Med Biol 2022. [DOI: 10.1016/s0969-8051(22)02204-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Witkowska E, Godlewska M, Osiejuk J, Gątarz S, Wileńska B, Kosińska K, Starnowska-Sokół J, Piotrowska A, Lipiński PFJ, Matalińska J, Dyniewicz J, Halik PK, Gniazdowska E, Przewlocka B, Misicka A. Bifunctional Opioid/Melanocortin Peptidomimetics for Use in Neuropathic Pain: Variation in the Type and Length of the Linker Connecting the Two Pharmacophores. Int J Mol Sci 2022; 23:674. [PMID: 35054860 PMCID: PMC8775902 DOI: 10.3390/ijms23020674] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2021] [Revised: 01/04/2022] [Accepted: 01/06/2022] [Indexed: 01/25/2023] Open
Abstract
Based on the mechanism of neuropathic pain induction, a new type of bifunctional hybrid peptidomimetics was obtained for potential use in this type of pain. Hybrids consist of two types of pharmacophores that are connected by different types of linkers. The first pharmacophore is an opioid agonist, and the second pharmacophore is an antagonist of the pronociceptive system, i.e., an antagonist of the melanocortin-4 receptor. The results of tests in acute and neuropathic pain models of the obtained compounds have shown that the type of linker used to connect pharmacophores had an effect on antinociceptive activity. Peptidomimetics containing longer flexible linkers were very effective at low doses in the neuropathic pain model. To elucidate the effect of linker lengths, two hybrids showing very high activity and two hybrids with lower activity were further tested for affinity for opioid (mu, delta) and melanocortin-4 receptors. Their complexes with the target receptors were also studied by molecular modelling. Our results do not show a simple relationship between linker length and affinity for particular receptor types but suggest that activity in neuropathic pain is related to a proper balance of receptor affinity rather than maximum binding to any or all of the target receptors.
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Affiliation(s)
- Ewa Witkowska
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland; (M.G.); (J.O.); (S.G.); (B.W.); (K.K.)
| | - Magda Godlewska
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland; (M.G.); (J.O.); (S.G.); (B.W.); (K.K.)
| | - Jowita Osiejuk
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland; (M.G.); (J.O.); (S.G.); (B.W.); (K.K.)
| | - Sandra Gątarz
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland; (M.G.); (J.O.); (S.G.); (B.W.); (K.K.)
| | - Beata Wileńska
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland; (M.G.); (J.O.); (S.G.); (B.W.); (K.K.)
- Biological and Chemical Research Centre, University of Warsaw, 101 Zwirki i Wigury St., 02-097 Warsaw, Poland
| | - Katarzyna Kosińska
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland; (M.G.); (J.O.); (S.G.); (B.W.); (K.K.)
| | - Joanna Starnowska-Sokół
- Department of Pain Pharmacology, Maj Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Str., 31-343 Krakow, Poland; (J.S.-S.); (A.P.); (B.P.)
| | - Anna Piotrowska
- Department of Pain Pharmacology, Maj Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Str., 31-343 Krakow, Poland; (J.S.-S.); (A.P.); (B.P.)
| | - Piotr F. J. Lipiński
- Department of Neuropeptides, Mossakowski Medical Research Institute Polish Academy of Sciences, Pawińskiego 5, 02-106 Warsaw, Poland; (P.F.J.L.); (J.M.); (J.D.)
| | - Joanna Matalińska
- Department of Neuropeptides, Mossakowski Medical Research Institute Polish Academy of Sciences, Pawińskiego 5, 02-106 Warsaw, Poland; (P.F.J.L.); (J.M.); (J.D.)
| | - Jolanta Dyniewicz
- Department of Neuropeptides, Mossakowski Medical Research Institute Polish Academy of Sciences, Pawińskiego 5, 02-106 Warsaw, Poland; (P.F.J.L.); (J.M.); (J.D.)
| | - Paweł K. Halik
- Centre of Radiochemistry and Nuclear Chemistry, Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195 Warsaw, Poland; (P.K.H.); (E.G.)
| | - Ewa Gniazdowska
- Centre of Radiochemistry and Nuclear Chemistry, Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195 Warsaw, Poland; (P.K.H.); (E.G.)
| | - Barbara Przewlocka
- Department of Pain Pharmacology, Maj Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Str., 31-343 Krakow, Poland; (J.S.-S.); (A.P.); (B.P.)
| | - Aleksandra Misicka
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland; (M.G.); (J.O.); (S.G.); (B.W.); (K.K.)
- Biological and Chemical Research Centre, University of Warsaw, 101 Zwirki i Wigury St., 02-097 Warsaw, Poland
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Śliwińska A, Figat R, Zgadzaj A, Wileńska B, Misicka A, Nałęcz-Jawecki G, Pietrosiuk A, Sykłowska-Baranek K. Polyscias filicifolia (Araliaceae) Hairy Roots with Antigenotoxic and Anti-Photogenotoxic Activity. Molecules 2021; 27:molecules27010186. [PMID: 35011416 PMCID: PMC8746452 DOI: 10.3390/molecules27010186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Revised: 12/21/2021] [Accepted: 12/26/2021] [Indexed: 11/30/2022] Open
Abstract
Hairy root cultures are considered as a valuable source of bioactive phytoconstituents with expanding applicability for their production. In the present study, hairy root cultures of Polyscias filicifolia (Araliaceae), a traditional Southeast Asian medicinal plant, were established. The transformation with Agrobacterium rhizogenes ATCC 15834 allowed to obtain 15 root lines. The K-1 line, demonstrating the highest growth capabilities, was subjected to further investigations. To enhance the biosynthetic potential of hairy roots, methyl jasmonate elicitation approach was applied (MeJA; at different doses and exposure time), with subsequent transfer of elicited roots to control medium. This strategy resulted in chlorogenic acid production up to 1.59 mg/g dry weight. HPLC-PDA-ESI-MS analysis demonstrated variation in extracts composition and allowed to identify different caffeic and ferulic acid derivatives. Next, cytotoxic, antigenotoxic, and anti-photogenotoxic properties of hairy roots extracts were determined. None of the tested extracts were cytotoxic. In addition, they demonstrated significant antigenotoxic activity with the highest protective potential; up to 52% and 49% of inhibition of induction ratio (IR) induced by the 2-aminoanthracene was revealed for extracts derived from hairy roots elicited for 3 days with 50 µM MeJA and roots elicited for 7 days with 100 µM MeJA and then transferred for 30 days to control medium, respectively. These same extracts exhibited the highest anti-photogenotoxic potential, up to 36% of inhibition of chloropromazine-induced genotoxicity.
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Affiliation(s)
- Anita Śliwińska
- Department of Pharmaceutical Biology and Medicinal Plant Biotechnology, Faculty of Pharmacy, Medical University of Warsaw, 1 Banacha St., 02-097 Warsaw, Poland; (A.Ś.); (A.P.); (K.S.-B.)
| | - Ramona Figat
- Department of Environmental Health Science, Faculty of Pharmacy, Medical University of Warsaw, Banacha 1, 02-097 Warsaw, Poland; (A.Z.); (G.N.-J.)
- Correspondence: ; Tel.: +48-22-5720740
| | - Anna Zgadzaj
- Department of Environmental Health Science, Faculty of Pharmacy, Medical University of Warsaw, Banacha 1, 02-097 Warsaw, Poland; (A.Z.); (G.N.-J.)
| | - Beata Wileńska
- Faculty of Chemistry, University of Warsaw, 1 Pasteura St., 02-093 Warsaw, Poland; (B.W.); (A.M.)
- Biological and Chemical Research Centre, 101 Żwirki i Wigury St., 02-097 Warsaw, Poland
| | - Aleksandra Misicka
- Faculty of Chemistry, University of Warsaw, 1 Pasteura St., 02-093 Warsaw, Poland; (B.W.); (A.M.)
- Biological and Chemical Research Centre, 101 Żwirki i Wigury St., 02-097 Warsaw, Poland
| | - Grzegorz Nałęcz-Jawecki
- Department of Environmental Health Science, Faculty of Pharmacy, Medical University of Warsaw, Banacha 1, 02-097 Warsaw, Poland; (A.Z.); (G.N.-J.)
| | - Agnieszka Pietrosiuk
- Department of Pharmaceutical Biology and Medicinal Plant Biotechnology, Faculty of Pharmacy, Medical University of Warsaw, 1 Banacha St., 02-097 Warsaw, Poland; (A.Ś.); (A.P.); (K.S.-B.)
| | - Katarzyna Sykłowska-Baranek
- Department of Pharmaceutical Biology and Medicinal Plant Biotechnology, Faculty of Pharmacy, Medical University of Warsaw, 1 Banacha St., 02-097 Warsaw, Poland; (A.Ś.); (A.P.); (K.S.-B.)
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Tymecka D, Lipiński PFJ, Fedorczyk B, Puszko A, Wileńska B, Perret GY, Misicka A. Structure-activity relationship study of tetrapeptide inhibitors of the Vascular Endothelial Growth Factor A binding to Neuropilin-1. Peptides 2017. [PMID: 28627371 DOI: 10.1016/j.peptides.2017.06.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Neuropilin-1 is considered as one of the key receptors responsible for signaling pathways involved in pathological angiogenesis necessary for tumor progression, therefore targeting of VEGF165 binding to NRP-1 could be a relevant strategy for antiangiogenic treatment. It was shown before that the VEGF165/NRP-1 interaction can be inhibited by short tetrapeptides with K/RXXR sequence. Here, we present a structure-activity relationship study of the systematic optimization of amino acid residues in positions 1-3 in the above tetrapeptides. All the 13 synthesized analogs possessed C-terminal arginine that is a necessary element for interaction with NRP-1. The obtained results of the inhibitory activity and modeling by molecular dynamics indicate that simultaneous interactions of the basic amino acid residues in position 1 and 4 (Arg) with Neuropilin-1 are crucial and their cooperation strongly affects the inhibitory activity. In addition, the binding strength is modulated by the flexibility of the peptide backbone (in the central part of the peptide), and the nature of the side chain of the amino acids at the second or third position. A dramatic decrease in the activity to the receptor is observed in flexible derivatives that are missing proline residues. The results described in this paper should prove useful for future studies aimed at establishing the best pharmacophore for inhibitors of VEGF165 binding to NRP-1.
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Affiliation(s)
- Dagmara Tymecka
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
| | - Piotr F J Lipiński
- Department of Neuropeptides, Mossakowski Medical Research Centre, Polish Academy of Sciences, 02-106 Warsaw, Poland
| | | | - Anna Puszko
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
| | - Beata Wileńska
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
| | - Gerard Y Perret
- Université Paris 13, Sorbonne Paris Cité, INSERM U1125, 74 rue Marcel Cachin, 93017 Bobigny, France
| | - Aleksandra Misicka
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland; Department of Neuropeptides, Mossakowski Medical Research Centre, Polish Academy of Sciences, 02-106 Warsaw, Poland.
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6
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Grabowska K, Puszko AK, Lipiński PFJ, Laskowska AK, Wileńska B, Witkowska E, Perret GY, Misicka A. Structure-activity relationship study of a small cyclic peptide H-c[Lys-Pro-Glu]-Arg-OH: a potent inhibitor of Vascular Endothelial Growth Factor interaction with Neuropilin-1. Bioorg Med Chem 2016; 25:597-602. [PMID: 27889287 DOI: 10.1016/j.bmc.2016.11.024] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 11/09/2016] [Accepted: 11/13/2016] [Indexed: 01/13/2023]
Abstract
Inhibition of angiogenesis is one of the most promising approaches in anticancer therapy. It was recently suggested that Neuropilin-1 (NRP-1) in tumour cells may serve as a separate receptor for Vascular Endothelial Growth Factor-165 (VEGF165) which is one of the main pro-angiogenic agents in the organism. Therefore molecules inhibiting VEGF165 binding to NRP-1 could be potential candidates for new antiangiogenic and anticancer drugs. Here we present a structure-activity relationship study of the peptide H-c[Lys-Pro-Glu]-Arg-OH which showed high inhibitory effect on VEGF165/NRP-1 binding (IC50=0.18μM) in our previous study. We report the design, synthesis, in vitro assays and docking analysis of four small cyclic peptides (14-,15-membered ring) and one bigger cyclic compound (30-membered ring). Our study shows that both the ring size and configuration of amino acid residues present in the structure are crucial for high inhibitory effect.
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Affiliation(s)
| | - Anna K Puszko
- Faculty of Chemistry, University of Warsaw, 02-093 Warsaw, Poland
| | - Piotr F J Lipiński
- Department of Neuropeptides, Mossakowski Medical Research Centre Polish Academy of Sciences, 02-106 Warsaw, Poland
| | - Anna K Laskowska
- Department of Neuropeptides, Mossakowski Medical Research Centre Polish Academy of Sciences, 02-106 Warsaw, Poland
| | - Beata Wileńska
- Faculty of Chemistry, University of Warsaw, 02-093 Warsaw, Poland
| | - Ewa Witkowska
- Faculty of Chemistry, University of Warsaw, 02-093 Warsaw, Poland
| | - Gerard Y Perret
- Université Paris 13, Sorbonne Paris Cité, INSERM U1125, 74 rue Marcel Cachin, 93017 Bobigny, France
| | - Aleksandra Misicka
- Faculty of Chemistry, University of Warsaw, 02-093 Warsaw, Poland; Department of Neuropeptides, Mossakowski Medical Research Centre Polish Academy of Sciences, 02-106 Warsaw, Poland.
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Grabowska K, Puszko AK, Lipiński PF, Laskowska AK, Wileńska B, Witkowska E, Misicka A. Design, synthesis and in vitro biological evaluation of a small cyclic peptide as inhibitor of vascular endothelial growth factor binding to neuropilin-1. Bioorg Med Chem Lett 2016; 26:2843-2846. [DOI: 10.1016/j.bmcl.2016.04.059] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 04/19/2016] [Accepted: 04/20/2016] [Indexed: 01/13/2023]
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Wileńska B, Świder P, Danikiewicz W. Reactions of stabilized aliphatic carbanions with esters of formic acid in the gas phase. Eur J Mass Spectrom (Chichester) 2015; 21:533-543. [PMID: 26307733 DOI: 10.1255/ejms.1324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The reactions of nitromethane, acetonitrile, and ethyl acetate carbanions with formic acid esters were investigated in the gas phase by mass spectrometry and quantum chemical calculations. It was found that the carbanion of nitromethane practically does not react with formic acid esters and only traces of the Claisen- type addition-elimination reaction product were observed. In the case of the deprotonated acetonitrile, the Claisen-type condensation that yielded the carbanion of cyanoacetaldehyde proceeded almost quantitatively for all the studied formates. Other products, like the Riveros reaction product, were observed in minor amounts. The ethyl acetate carbanion reacts with formates in a much more complex way because it decomposes in a collision cell, yielding the deprotonated ketene anion, which also can react with formic acid esters. Consequently, the Claisen condensation reaction products of both anions were observed as well as the products of other reactions. All the proposed reaction pathways were confirmed by quantum chemical calculations, including the transition-state energies.
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Affiliation(s)
- Beata Wileńska
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw, Poland. University of Warsaw, Faculty of Chemistry, Pasteura 1, 02-093 Warsaw, Poland.
| | - Paweł Świder
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw, Poland.
| | - Witold Danikiewicz
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw, Poland.
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Lech K, Witkoś K, Wileńska B, Jarosz M. Identification of unknown colorants in pre-Columbian textiles dyed with American cochineal (Dactylopius coccus Costa) using high-performance liquid chromatography and tandem mass spectrometry. Anal Bioanal Chem 2014; 407:855-67. [PMID: 25213214 PMCID: PMC4305107 DOI: 10.1007/s00216-014-8107-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 08/07/2014] [Accepted: 08/11/2014] [Indexed: 11/09/2022]
Abstract
The present study concerns the identification of nine thus-far unknown derivatives of carminic acid extracted from pre-Columbian Peruvian textiles dyed with American cochineal—these derivatives are not found in commercially available preparations of the dye. These compounds probably represent a unique fingerprint of dyed textiles from this region, as they have never been reported to occur in other fabrics of historical value. They were separated by reversed-phase high-performance liquid chromatography (phenyl column) and detected using a UV/vis spectrophotometer and two tandem mass spectrometers. Peaks observed in chromatograms registered at 450 and 500 nm were further identified by ESI QqQ MS (mainly in the negative ion mode), supported by high-resolution ESI QIT/ToF MS data. The characteristic fragmentation pathways of isolated carminic acid and its derivatives provided additional information concerning lost neutrals and thus the functional groups and substituents present in the parent molecules. This information mainly related to multiple cleavages of the hexoside moiety (initially cross-ring cleavage), which are characteristic of C-glucosides (loss of 90, 120, and 148 Da). This is accompanied by the elimination of H2O as well as the further loss of 60 Da from the hexoside moiety. Moreover, other losses from the carbonyl groups (44 Da from CO2 loss, 62 Da from ethylene glycol loss, 32 Da from O2 loss, 138 Da from hydroxybenzoic acid, and 120 Da from oxomethylene cyclohexadienone) provided more specific information about structures of the identified derivatives of carminic acid.
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Affiliation(s)
- Katarzyna Lech
- Faculty of Chemistry, Chair of Analytical Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664, Warsaw, Poland
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Zimnicka M, Wileńska B, Sekiguchi O, Uggerud E, Danikiewicz W. Reactions of nitrophenide and halonitrophenide ions with acrylonitrile and alkyl acrylates in the gas phase: addition to the carbonyl group versus Michael addition. J Mass Spectrom 2012; 47:425-438. [PMID: 22689618 DOI: 10.1002/jms.2042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Gas-phase reactions of isomeric nitrophenide ions and p-halonitrophenide ions with acrylonitrile, methyl acrylate, and ethyl acrylate have been studied using mass spectrometry and computational methods. Depending on the structure of the α,β-unsaturated compound, formation of adducts to the carbonyl group of the acrylate (for methyl acrylate and ethyl acrylate) and β-adducts (adducts of p-halonitrophenide ions to α,β-unsaturated compounds in β position) was observed. Further transformations of these adducts lead to the products of elimination of an alcohol molecule and the anionic products of intramolecular substitution of a halogen atom, respectively.
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Affiliation(s)
- Magdalena Zimnicka
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland
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Wileńska B, Danikiewicz W, Bugaj M, Kamieńska-Trela K, Krówczyńsk A. Electron ionization and electrospray mass spectra of diaryl-substituted enaminoketones and their thio analogs. Eur J Mass Spectrom (Chichester) 2011; 17:237-243. [PMID: 21828419 DOI: 10.1255/ejms.1126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Electron ionization (EI) and positive electrospray ionization (ESI) mass spectra of selected diaryl enaminoketones and enaminothiones have been studied. In the EI mass spectra of both classes of compound, molecular ion peaks are accompanied by the peaks corresponding to the [M-H](+) ions. The formation of these ions can be rationalized by a cyclization reaction resulting in the formation of the respective isoxazolium and isothiazolium cations. Under positive ESI conditions, in the spectra recorded for the enaminoketones peaks corresponding to the [M+H](+), [M+Na](+) and [2M+Na](+) ions appeared, while in the spectra recorded for the enaminothiones, peaks corresponding to the [M-H](+) ions were dominant. These ions are most likely formed by oxidation of the neutral enaminothione molecules on the surface of the positively charged stainless steel capillary in the ESI ion source (anodic oxidation).
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Affiliation(s)
- Beata Wileńska
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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