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Mohamed Ameen H, Kunsági-Máté S, Bognár B, Szente L, Poór M, Lemli B. Thermodynamic Characterization of the Interaction between the Antimicrobial Drug Sulfamethazine and Two Selected Cyclodextrins. Molecules 2019; 24:molecules24244565. [PMID: 31847074 PMCID: PMC6943531 DOI: 10.3390/molecules24244565] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Revised: 12/05/2019] [Accepted: 12/11/2019] [Indexed: 11/18/2022] Open
Abstract
Sulfamethazine is a representative member of the sulfonamide antibiotic drugs; it is still used in human and veterinary therapy. The protonation state of this drug affects its aqueous solubility, which can be controlled by its inclusion complexes with native or chemically-modified cyclodextrins. In this work, the temperature-dependent (298–313 K) interaction of sulfamethazine with native and randomly methylated β-cyclodextrins have been investigated at acidic and neutral pH. Surprisingly, the interaction between the neutral and anionic forms of the guest molecule and cyclodextrins with electron rich cavity are thermodynamically more favorable compared to the cationic guest. This property probably due to the enhanced formation of zwitterionic form of sulfamethazine in the hydrophobic cavities of cyclodextrins. Spectroscopic measurements and molecular modeling studies indicated the possible driving forces (hydrophobic interaction, hydrogen bonding, and electrostatic interaction) of the complex formation, and highlighted the importance of the reorganization of the solvent molecules during the entering of the guest molecule into the host’s cavity.
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Affiliation(s)
- Hiba Mohamed Ameen
- Department of General and Physical Chemistry, Faculty of Sciences, University of Pécs, Ifjúság 6, H-7624 Pécs, Hungary;
- Institute of Organic and Medicinal Chemistry, Medical School, University of Pécs, Szigeti 12, H-7624 Pécs, Hungary; (S.K.-M.); (B.B.)
| | - Sándor Kunsági-Máté
- Institute of Organic and Medicinal Chemistry, Medical School, University of Pécs, Szigeti 12, H-7624 Pécs, Hungary; (S.K.-M.); (B.B.)
- János Szentágothai Research Center, University of Pécs, Ifjúság 20, H-7624 Pécs, Hungary;
| | - Balázs Bognár
- Institute of Organic and Medicinal Chemistry, Medical School, University of Pécs, Szigeti 12, H-7624 Pécs, Hungary; (S.K.-M.); (B.B.)
| | - Lajos Szente
- CycloLab Cyclodextrin Research & Development Laboratory, Ltd., Illatos 7, H-1097 Budapest, Hungary;
| | - Miklós Poór
- János Szentágothai Research Center, University of Pécs, Ifjúság 20, H-7624 Pécs, Hungary;
- Department of Pharmacology, Faculty of Pharmacy, University of Pécs, Szigeti 12, H-7624 Pécs, Hungary
| | - Beáta Lemli
- Institute of Organic and Medicinal Chemistry, Medical School, University of Pécs, Szigeti 12, H-7624 Pécs, Hungary; (S.K.-M.); (B.B.)
- János Szentágothai Research Center, University of Pécs, Ifjúság 20, H-7624 Pécs, Hungary;
- Correspondence: ; Tel.: +36-72-503-600 (ext. 35462)
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Nagymihály Z, Caturello NAMS, Takátsy A, Aragay G, Kollár L, Albuquerque RQ, Csók Z. Palladium-Mediated Catalysis Leads to Intramolecular Narcissistic Self-Sorting on a Cavitand Platform. J Org Chem 2016; 82:390-396. [PMID: 27983839 DOI: 10.1021/acs.joc.6b02472] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Palladium-catalyzed aminocarbonylation reactions have been used to directly convert a tetraiodocavitand intermediate into the corresponding carboxamides and 2-ketocarboxamides. When complex mixtures of the amine reactants are employed in competition experiments using polar solvents, such as DMF, no "mixed" products possessing structurally different amide fragments are detected either by 1H or 13C NMR. Only highly symmetrical cavitands are sorted out of a large number of potentially feasible products, which represents a rare example of intramolecular, narcissistic self-sorting. Our experimental results along with thermodynamic energy analysis suggest that the observed self-sorting is a symmetry-driven, kinetically controlled process.
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Affiliation(s)
- Zoltán Nagymihály
- Department of Inorganic Chemistry and MTA-PTE Research Group for Selective Chemical Syntheses, University of Pécs , Ifjúság 6, 7624 Pécs, Hungary
| | - Naidel A M S Caturello
- São Carlos Institute of Chemistry, University of São Paulo , Av. Trab. São-carlense 400, 13560-970 São Carlos, SP, Brazil
| | - Anikó Takátsy
- Department of Biochemistry and Medical Chemistry, Medical School, University of Pécs , Szigeti 12, 7624 Pécs, Hungary
| | - Gemma Aragay
- Institute of Chemical Research of Catalonia (ICIQ) , Av. Països Catalans 16, 43007 Tarragona, Spain
| | - László Kollár
- Department of Inorganic Chemistry and MTA-PTE Research Group for Selective Chemical Syntheses, University of Pécs , Ifjúság 6, 7624 Pécs, Hungary
| | - Rodrigo Q Albuquerque
- São Carlos Institute of Chemistry, University of São Paulo , Av. Trab. São-carlense 400, 13560-970 São Carlos, SP, Brazil.,School of Pharmacy & Biomolecular Sciences, Liverpool John Moores University , Liverpool L3 3AF, United Kingdom
| | - Zsolt Csók
- São Carlos Institute of Chemistry, University of São Paulo , Av. Trab. São-carlense 400, 13560-970 São Carlos, SP, Brazil
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