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Benkovics G, Malanga M, Fenyvesi É. The ‘Visualized’ macrocycles: Chemistry and application of fluorophore tagged cyclodextrins. Int J Pharm 2017; 531:689-700. [DOI: 10.1016/j.ijpharm.2017.04.035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2017] [Revised: 04/06/2017] [Accepted: 04/16/2017] [Indexed: 12/22/2022]
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Benkovics G, Afonso D, Darcsi A, Béni S, Conoci S, Fenyvesi É, Szente L, Malanga M, Sortino S. Novel β-cyclodextrin-eosin conjugates. Beilstein J Org Chem 2017; 13:543-551. [PMID: 28405233 PMCID: PMC5372748 DOI: 10.3762/bjoc.13.52] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 02/23/2017] [Indexed: 01/08/2023] Open
Abstract
Eosin B (EoB) and eosin Y (EoY), two xanthene dye derivatives with photosensitizing ability were prepared in high purity through an improved synthetic route. The dyes were grafted to a 6-monoamino-β-cyclodextrin scaffold under mild reaction conditions through a stable amide linkage using the coupling agent 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride. The molecular conjugates, well soluble in aqueous medium, were extensively characterized by 1D and 2D NMR spectroscopy and mass spectrometry. Preliminary spectroscopic investigations showed that the β-cyclodextrin–EoY conjugate retains both the fluorescence properties and the capability to photogenerate singlet oxygen of the unbound chromophore. In contrast, the corresponding β-cyclodextrin–EoB conjugate did not show either relevant emission or photosensitizing activity probably due to aggregation in aqueous medium, which precludes any response to light excitation.
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Affiliation(s)
- Gábor Benkovics
- CycloLab, Cyclodextrin R&D Ltd, Budapest, H-1097 Illatos út 7, Hungary; Department of Organic Chemistry, Faculty of Science, Charles University in Prague, Hlavová 8, 128 43, Prague 2, Czech Republic
| | - Damien Afonso
- Laboratory of Photochemistry, Department of Drug Sciences, University of Catania, I-95125 Viale A. Doria 6, Italy
| | - András Darcsi
- Department of Pharmacognosy, Semmelweis University, H-1085 Üllői út 26, Hungary
| | - Szabolcs Béni
- Department of Pharmacognosy, Semmelweis University, H-1085 Üllői út 26, Hungary
| | - Sabrina Conoci
- STMicroelectronics, Stradale Primosole 50, I-95121, Catania, Italy
| | - Éva Fenyvesi
- CycloLab, Cyclodextrin R&D Ltd, Budapest, H-1097 Illatos út 7, Hungary
| | - Lajos Szente
- CycloLab, Cyclodextrin R&D Ltd, Budapest, H-1097 Illatos út 7, Hungary
| | - Milo Malanga
- CycloLab, Cyclodextrin R&D Ltd, Budapest, H-1097 Illatos út 7, Hungary
| | - Salvatore Sortino
- Laboratory of Photochemistry, Department of Drug Sciences, University of Catania, I-95125 Viale A. Doria 6, Italy
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Malanga M, Darcsi A, Balint M, Benkovics G, Sohajda T, Beni S. New synthetic strategies for xanthene-dye-appended cyclodextrins. Beilstein J Org Chem 2016; 12:537-48. [PMID: 27340446 PMCID: PMC4902026 DOI: 10.3762/bjoc.12.53] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Accepted: 03/02/2016] [Indexed: 01/09/2023] Open
Abstract
Xanthene dyes can be appended to cyclodextrins via an ester or amide bridge in order to switch the fluorescence on or off. This is made possible through the formation of nonfluorescent lactones or lactams as the fluorophore can reversibly cyclize. In this context we report a green approach for the synthesis of switchable xanthene-dye-appended cyclodextrins based on the coupling agent 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride (DMT-MM). By using 6-monoamino-β-cyclodextrin and commercially available inexpensive dyes, we prepared rhodamine- and fluorescein-appended cyclodextrins. The compounds were characterized by NMR and IR spectroscopy and MS spectrometry, their UV-vis spectra were recorded at various pH, and their purity was determined by capillary electrophoresis. Two potential models for the supramolecular assembly of the xanthene-dye-appended cyclodextrins were developed based on the set of data collected by the extensive NMR characterization.
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Affiliation(s)
- Milo Malanga
- CycloLab, Cyclodextrin R&D Ltd., Budapest, H-1097 Illatos út 7, Hungary
| | - Andras Darcsi
- Department of Pharmacognosy, Semmelweis University, H-1085 Üllői út 26, Hungary
| | - Mihaly Balint
- CycloLab, Cyclodextrin R&D Ltd., Budapest, H-1097 Illatos út 7, Hungary
| | - Gabor Benkovics
- CycloLab, Cyclodextrin R&D Ltd., Budapest, H-1097 Illatos út 7, Hungary
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8, 12843 Prague 2, Czech Republic
| | - Tamas Sohajda
- CycloLab, Cyclodextrin R&D Ltd., Budapest, H-1097 Illatos út 7, Hungary
| | - Szabolcs Beni
- Department of Pharmacognosy, Semmelweis University, H-1085 Üllői út 26, Hungary
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Bogdanova LN, McHedlov-Petrossyan NO, Vodolazkaya NA, Lebed AV. The influence of beta-cyclodextrin on acid-base and tautomeric equilibrium of fluorescein dyes in aqueous solution. Carbohydr Res 2010; 345:1882-90. [PMID: 20678757 DOI: 10.1016/j.carres.2010.07.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2010] [Revised: 06/25/2010] [Accepted: 07/04/2010] [Indexed: 10/19/2022]
Abstract
The protolytic equilibrium of fluorescein in aqueous solutions was studied in the presence of cycloheptaamylose (beta-cyclodextrin, or beta-CD). The constants of stepwise ionization of the dye (H(3)R(+)left arrow over right arrowH(2)Rleft arrow over right arrow HR(-)left arrow over right arrowR(2-)), K(a0), K(a1), and K(a2) were determined using vis-spectroscopy at ionic strength 0.05 M (NaCl+buffer) and 25 degrees C. In the presence of 0.0086 M beta-CD, the indices of ionization constants are as follows: pK(a0)=1.21+/-0.12, pK(a1)=5.08+/-0.03, pK(a2)=6.35+/-0.02. The changes in these pK(a)s, as compared with the values determined without cyclodextrin, are unequal. Namely, the pK(a0) value decreases by 1.0, while the pK(a1) value increases by 0.7. Thus, the introduction of beta-CD allows to govern the ratios K(a0)/K(a1) and K(a1)/K(a2), which are equal to, respectively, 141 and 151 in water, and 7.4 x 10(3) and 18.6 with cyclodextrin added. Rationalization of the observed phenomenon is possible taking into account the detailed scheme of protolytic equilibrium. Conclusions concerning tautomerism of dye molecules were deduced from absorption spectra; the fractions of tautomers, tautomerization constants, and microscopic ionization constants were evaluated. These data allow concluding that the main reason for the aforementioned pK(a) alterations is the binding of H(2)R by the cyclodextrin cavity accompanied by turning these neutral species into the colorless lactone. The host-guest interaction of neutral species of fluorescein isothiocyanate, 2,7-dichlorofluorescein, and 3',4',5',6'-tetrachlorofluorescein also results in the cyclodextrin-assisted shift of tautomeric equilibrium. Such nature of interactions is proved by the addition of competing agents, camphor-4-carboxylic acid and sodium n-nonylsulfonate, which results in the removing of neutral dye species from the cycloheptaamylose cavity.
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Wenz G, Kräuter I, Sackmann E. Assembly of a fluorescent cyclodextrin polyrotaxane and its detection by fluorescence microscopy. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/pola.23666] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Tan W, Zhang D, Wen G, Zhou Y, Zhu D. Tuning the energy transfer process for the ensemble of fluorescein with β-cyclodextrin (β-CD) unit and spiropyran with adamantyl (AD) unit: A temperature-gated molecular fluorescence switch. J Photochem Photobiol A Chem 2008. [DOI: 10.1016/j.jphotochem.2008.01.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Bügler J, Engbersen JFJ, Reinhoudt DN. Novel Water-Soluble β-Cyclodextrin−Calix[4]arene Couples as Fluorescent Sensor Molecules for the Detection of Neutral Analytes. J Org Chem 1998. [DOI: 10.1021/jo9723321] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jürgen Bügler
- Laboratory of Supramolecular Chemistry and Technology, University of Twente, P.O. Box 217, NL-7500 AE Enschede, The Netherlands
| | - Johan F. J. Engbersen
- Laboratory of Supramolecular Chemistry and Technology, University of Twente, P.O. Box 217, NL-7500 AE Enschede, The Netherlands
| | - David N. Reinhoudt
- Laboratory of Supramolecular Chemistry and Technology, University of Twente, P.O. Box 217, NL-7500 AE Enschede, The Netherlands
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Fujita S, Toru T, Kitagawa Y, Kagiyama N, Momiyama M. Highly sensitive detection of membrane-bound DNA using fluorescein derivatives. Anal Chim Acta 1997. [DOI: 10.1016/s0003-2670(96)00479-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Fujita S, Kagiyama N, Momiyama M, Toru T. Efficient Detection of Membrane-Bound Nucleic Acids Using New Fluorescein Derivative. CHEM LETT 1996. [DOI: 10.1246/cl.1996.1073] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Corradini R, Dossena A, Marchelli R, Panagia A, Sartor G, Saviano M, Lombardi A, Pavone V. A Modified Cyclodextrin with a Fully Encapsulated Dansyl Group: Self-Inclusion in the Solid State and in Solution. Chemistry 1996. [DOI: 10.1002/chem.19960020404] [Citation(s) in RCA: 91] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Strong binding between acidic guests and fluorescein modified -?-Cyclodextrin via hydrogen bonding. ACTA ACUST UNITED AC 1996. [DOI: 10.1007/bf01044998] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Peterson BR, Wallimann P, Carcanague DR, Diederich F. Steroid complexation by cyclophane receptors in aqueous solution: Substrate selectivity, enthalpic driving force for cavity inclusion, and enthalpy-entropy compensation. Tetrahedron 1995. [DOI: 10.1016/0040-4020(94)00905-a] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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