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Fully Symmetric Cyclodextrin Polycarboxylates: How to Determine Reliable Protonation Constants from NMR Titration Data. Int J Mol Sci 2022; 23:ijms232214448. [PMID: 36430926 PMCID: PMC9696085 DOI: 10.3390/ijms232214448] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 11/14/2022] [Accepted: 11/16/2022] [Indexed: 11/22/2022] Open
Abstract
Acid-base properties of cyclodextrins (CDs), persubstituted at C-6 by 3-mercaptopropionic acid, sualphadex (Suα-CD), subetadex (Suβ-CD) and sugammadex (Suγ-CD, the antidote of neuromuscular blocking steroids) were studied by 1H NMR-pH titrations. For each CD, the severe overlap in protonation steps prevented the calculation of macroscopic pKa values using the standard data fitting model. Considering the full symmetry of polycarboxylate structures, we reduced the number of unknown NMR parameters in the "Q-fitting" or the novel "equidistant macroscopic" evaluation approaches. These models already provided pKa values, but some of them proved to be physically unrealistic, deceptively suggesting cooperativity in carboxylate protonations. The latter problem could be circumvented by adapting the microscopic site-binding (cluster expansion) model by Borkovec, which applies pairwise interactivity parameters to quantify the mutual basicity-decreasing effect of carboxylate protonations. Surprisingly, only a single averaged interactivity parameter could be calculated reliably besides the carboxylate 'core' microconstant for each CD derivative. The speciation of protonation isomers hence could not be resolved, but the optimized microscopic basicity parameters could be converted to the following sets of macroscopic pKa values: 3.84, 4.35, 4.81, 5.31, 5.78, 6.28 for Suα-CD; 3.82, 4.31, 4.73, 5.18, 5.64, 6.06, 6.54 for Suβ-CD and 3.83, 4.28, 4.65, 5.03, 5.43, 5.81, 6.18, 6.64 for Suγ-CD. The pH-dependent charge of these compounds can now be accurately calculated, in support of designing new analytical methods to exploit their charge-dependent molecular recognition such as in cyclodextrin-aided chiral capillary electrophoresis.
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Saridakis E, Kasimati EM, Yannakopoulou K, Mavridis IM. A guanidino-γ-cyclodextrin superdimer generates a twin receptor for phosphate dimers assembled by anti-electrostatic hydrogen bonds. Chem Commun (Camb) 2022; 58:5300-5303. [PMID: 35411367 DOI: 10.1039/d2cc00323f] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Octakis-6-guadinidino-γ-cyclodextrin (gguan) hydrochloride in the presence of phosphates crystallises from aqueous solution in the unprecedented form of a superdimer (dimer-within-a-dimer). The self-assembly exposes four circular octa-guanidinium regions that bind and stabilise discrete H-bonded phosphate anion dimers. The small (∼2 nm) gguan-phosphate assembly is preorganised and stable in aqueous solution, as demonstrated by DLS and NMR experiments.
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Affiliation(s)
- Emmanuel Saridakis
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", Patr. Grigoriou E' & 27 Neapoleos str, Aghia Paraskevi Attikis 15341, Greece.
| | - Eleni-Marina Kasimati
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", Patr. Grigoriou E' & 27 Neapoleos str, Aghia Paraskevi Attikis 15341, Greece.
| | - Konstantina Yannakopoulou
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", Patr. Grigoriou E' & 27 Neapoleos str, Aghia Paraskevi Attikis 15341, Greece.
| | - Irene M Mavridis
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", Patr. Grigoriou E' & 27 Neapoleos str, Aghia Paraskevi Attikis 15341, Greece.
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3
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Kaur J, Nadimetla DN, Bhosale SV, Singh PK. Polyanionic Cyclodextrin-Induced Supramolecular Assembly of a Cationic Tetraphenylethylene Derivative with Aggregation-Induced Emission. J Phys Chem B 2022; 126:1147-1155. [PMID: 35103477 DOI: 10.1021/acs.jpcb.1c09780] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The combination of supramolecular chemistry and aggregation-induced emission-based luminogens (AIEgens) has recently attracted tremendous attention because of its ability to offer large emission enhancement even in substantially dilute solutions. In this work, a new aggregation-induced emission (AIE)-based supramolecular assembly has been reported, which consists of a polyanionic cyclodextrin derivative and a tetracationic tetraphenylethylene (TPE) derivative. Ionic cyclodextrins have attracted significant attention in host-guest supramolecular chemistry and pharmaceutical industry. However, ionic derivatives of β-cyclodextrins have not been explored to establish noncovalent interactions-based aggregation assembly of the most popular class of AIEgens, i.e., tetraphenylethylene derivatives. The current report demonstrates AIE of a tetracationic methyl pyridinium derivative of tetraphenylethylene (TPy-TPE) induced by a polyanionic sulfated β-cyclodextrin (S-βCD). The AIE-based supramolecular assembly has been thoroughly investigated using steady-state fluorescence, ground-state absorbance, and time-resolved fluorescence measurements. Further, the response of the supramolecular assembly towards external stimuli, such as, ionic strength, pH, and temperature, has been investigated. In addition, the complexation behavior of the TPE derivative has also been compared with the native neutral β-cyclodextrin derivative, which delineates the important role of the negatively charged portal of S-βCD in inducing aggregation of the TPy-TPE. The stoichiometry of the complex has been found to be 3:1 for TPy-TPE:S-βCD, using Job's plot analysis. Finally, to get insights into the underlying interactions between the supramolecular assembly components, molecular docking calculations have been performed.
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Affiliation(s)
- Jasvir Kaur
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Dinesh N Nadimetla
- School of Chemical Sciences, Goa University, Taleigao Plateau, Goa 403 206, India
| | - Sheshanath V Bhosale
- School of Chemical Sciences, Goa University, Taleigao Plateau, Goa 403 206, India
| | - Prabhat K Singh
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India.,Homi Bhabha National Institute, Anushaktinagar, Mumbai 400085, India
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4
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Nemeth T, de Wild T, Gubler L, Nauser T. Impact of substitution on reactions and stability of one-electron oxidised phenyl sulfonates in aqueous solution. Phys Chem Chem Phys 2022; 24:895-901. [PMID: 34909811 PMCID: PMC8725611 DOI: 10.1039/d1cp04518k] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Highly reactive aromatic cation radicals have been invoked lately in synthetic routes and in the degradation pathways of hydrocarbon-based polymers. Changes in the electron density of aromatic compounds are expected to alter the reaction pathway following one electron oxidation through altering the pKa of the formed intermediate cation radical. Electron-donating groups increase its stability, however, little experimental data are known. While, in theory, the cation radical can be repaired by simple electron transfer, electron transfer to or from its deprotonated form, the hydroxycyclohexadienyl radical, will cause permanent modification or degradation. Time-resolved absorption spectroscopy indicates a pKa ≈ 2–3 for the 4-(tert-butyl)-2-methoxyphenylsulfonate (BMPS) radical cation, while its parent compound 4-(tert-butyl) phenylsulfonate (BPS) is much more acidic. The stability of both compounds towards oxidation by HO˙ was evaluated under air at pH 5 and pH 0. At pH 5, both BMPS and BPS are unstable, and superstoichiometric degradation was observed. Degradation was slightly reduced for BPS at pH 0. In contrast, the more electron rich BMPS showed 80% lower degradation. We unambigously showed that in the presence of Ce(iii) and H2O2 at pH 0 both BMPS and BPS could be catalytically repaired via one electron reduction, resulting in further damage moderation. Functional groups can be used to modify the equilibrium position and tune the reactivity of one electron oxidised aromatic compounds.![]()
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Affiliation(s)
- Tamas Nemeth
- Electrochemistry Laboratory, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.,Laboratory of Inorganic Chemistry, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland.
| | - Tym de Wild
- Electrochemistry Laboratory, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Lorenz Gubler
- Electrochemistry Laboratory, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Thomas Nauser
- Laboratory of Inorganic Chemistry, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland.
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5
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Łagiewka J, Girek T, Ciesielski W. Cyclodextrins-Peptides/Proteins Conjugates: Synthesis, Properties and Applications. Polymers (Basel) 2021; 13:1759. [PMID: 34072062 PMCID: PMC8198514 DOI: 10.3390/polym13111759] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 05/19/2021] [Accepted: 05/25/2021] [Indexed: 12/24/2022] Open
Abstract
Cyclodextrins (CDs) are a family of macrocyclic oligosaccharides mostly composed of six, seven, or eight α-D-glucopyranose units with α-1,4-glycosidic bonds to form toroidal structures. The CDs possess a hydrophilic exterior and hydrophobic interior with the ability to form an inclusion complex, especially with hydrophobic molecules. However, most existing studies are about conjugation CDs with peptide/protein focusing on the formation of new systems. The CD-peptide/protein can possess new abilities; particularly, the cavity can be applied in modulation properties of more complexed proteins. Most studies are focused on drug delivery, such as targeted delivery in cell-penetrating peptides or co-delivery. The co-delivery is based mostly on polylysine systems; on the other hand, the CD-peptide allows us to understand biomolecular mechanisms such as fibryllation or stem cell behaviour. Moreover, the CD-proteins are more complexed systems with a focus on targeted therapy; these conjugates might be controllable with various properties due to changes in their stability. Finally, the studies of CD-peptide/protein are promising in biomedical application and provide new possibilities for the conjugation of simple molecules to biomolecules.
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Affiliation(s)
- Jakub Łagiewka
- Faculty of Mathematics and Natural Science, Jan Dlugosz University in Czestochowa, Armii Krajowej Ave., 13/15, 42 201 Czestochowa, Poland; (T.G.); (W.C.)
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6
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Várnai B, Grabarics M, Szakács Z, Pagel K, Malanga M, Sohajda T, Béni S. Structural characterization of fondaparinux interaction with per-6-amino-beta-cyclodextrin: An NMR and MS study. J Pharm Biomed Anal 2021; 197:113947. [PMID: 33601159 DOI: 10.1016/j.jpba.2021.113947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 01/28/2021] [Accepted: 01/30/2021] [Indexed: 11/18/2022]
Abstract
The highly anionic synthetic pentasaccharide fondaparinux (FDPX) - representing the antithrombin binding sequence of heparin - is in clinical use as a potent anticoagulant. Contrary to the unfractionated heparin, FDPX lacks potent antidote completely reversing its anticoagulant activity, therefore it is of great importance to identify new structures exhibiting strong intermolecular interactions towards FDPX. The polycationic heptakis(6-amino-6-deoxy)-beta-cyclodextrin (NH2-β-CD) can serve as an excellent model compound to mimic these interactions between the oppositely charged oligosaccharides. Herein, extensive NMR spectroscopic and nano-electrospray ionization mass spectrometric (nESI-MS) studies were conducted to understand the molecular-level interactions in the FDPX - NH2-β-CD systems. NMR experiments were performed at pD 7.4 and 2.0. Job's method of continuous variation and 1H NMR titration experiments suggested the formation of FDPX∙NH2-β-CD complex at pD 7.4, while the presence of multiple complexes was assumed at pD 2.0. Stability constants were determined by separate 1H NMR titrations, yielding log β11=3.65 ± 0.02 at pD 7.4, while log β11 ≥ 4.9 value suggested a high-affinity system at pD 2.0. 2D NOESY NMR studies indicated spatial proximities between the anomeric resonance α-l-iduronic acid residue and the cyclodextrin's methylene unit in the proximity of the cationic amino function. Acidic degradation of FDPX was investigated by NMR and MS for the first time in detail confirming that desulfation occurs involving one to two sulfate moieties. The desulfation of FDPX was inhibited by the cationic cyclodextrin in the case of equimolar ratio at pD 2.0. This is the first report on the stabilizing effect of cyclodextrin complexation on heparin degradation.
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Affiliation(s)
- Bianka Várnai
- Semmelweis University, Department of Pharmacognosy, Üllői út. 26, H-1085, Budapest, Hungary
| | - Márkó Grabarics
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Arnimallee 22, 14195, Berlin, Germany; Fritz Haber Institute of the Max Planck Society, Department of Molecular Physics, Faradayweg 4-6, 14195, Berlin, Germany
| | - Zoltán Szakács
- Gedeon Richter Plc., Spectroscopic Research Department, H-1475, Budapest, P.O.B. 27, Hungary
| | - Kevin Pagel
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Arnimallee 22, 14195, Berlin, Germany; Fritz Haber Institute of the Max Planck Society, Department of Molecular Physics, Faradayweg 4-6, 14195, Berlin, Germany
| | - Milo Malanga
- CycloLab, Cyclodextrin R&D Ltd, Budapest, H-1097, Illatos út 7, Hungary
| | - Tamás Sohajda
- CycloLab, Cyclodextrin R&D Ltd, Budapest, H-1097, Illatos út 7, Hungary
| | - Szabolcs Béni
- Semmelweis University, Department of Pharmacognosy, Üllői út. 26, H-1085, Budapest, Hungary.
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Hesler M, Schwarz DH, Dähnhardt-Pfeiffer S, Wagner S, von Briesen H, Wenz G, Kohl Y. Synthesis and in vitro evaluation of cyclodextrin hyaluronic acid conjugates as a new candidate for intestinal drug carrier for steroid hormones. Eur J Pharm Sci 2019; 143:105181. [PMID: 31852628 DOI: 10.1016/j.ejps.2019.105181] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 11/28/2019] [Accepted: 12/10/2019] [Indexed: 12/17/2022]
Abstract
Steroid hormones became increasingly interesting as active pharmaceutical ingredients for the treatment of endocrine disorders. However, medical applications of many steroidal drugs are inhibited by their very low aqueous solubilities giving rise to low bioavailabilities. Therefore, the prioritized oral administration of steroidal drugs remains problematic. Cyclodextrins are promising candidates for the development of drug delivery systems for oral route applications, since they solubilize hydrophobic steroids and increase their rate of transport in aqueous environments. In this study, the synthesis and characterization of polymeric β-cyclodextrin derivates is described, which result from the attachment of a hydrophilic β-CD-thioether to hyaluronic acid. Host-guest complexes of the synthesized β-cyclodextrin hyaluronic acid conjugates were formed with two poorly soluble model steroids (β-estradiol, dexamethasone) and compared to monomeric β-cyclodextrin derivates regarding solubilization and complexation efficiency. The β-cyclodextrin-drug (host-guest) complexes were evaluated in vitro for their suitability (cytotoxicity and transport rate) as intestinal drug carriers for steroid hormones. In case of β-estradiol, higher solubilities could be achieved by complexation with both synthesized β-cyclodextrin derivates, leading to significantly higher intestinal transport rates in vitro. However, this success could not be shown for dexamethasone, which namely solubilized better, but could not enhance the transport rate significantly. Thus, this study demonstrates the biocompatibility of the synthesized and characterized β-cyclodextrin derivates and shows their potential as new candidate for intestinal drug carrier for steroid hormones like β-estradiol.
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Affiliation(s)
- Michelle Hesler
- Fraunhofer Institute for Biomedical Engineering, Department Bioprocessing & Bioanalytics, Joseph-von-Fraunhofer-Weg 1, 66280 Sulzbach, Germany.
| | - Dennis H Schwarz
- Saarland University, Organic Macromolecular Chemistry, 66123 Saarbrücken, Germany.
| | | | - Sylvia Wagner
- Fraunhofer Institute for Biomedical Engineering, Department Bioprocessing & Bioanalytics, Joseph-von-Fraunhofer-Weg 1, 66280 Sulzbach, Germany.
| | - Hagen von Briesen
- Fraunhofer Institute for Biomedical Engineering, Department Bioprocessing & Bioanalytics, Joseph-von-Fraunhofer-Weg 1, 66280 Sulzbach, Germany.
| | - Gerhard Wenz
- Saarland University, Organic Macromolecular Chemistry, 66123 Saarbrücken, Germany.
| | - Yvonne Kohl
- Fraunhofer Institute for Biomedical Engineering, Department Bioprocessing & Bioanalytics, Joseph-von-Fraunhofer-Weg 1, 66280 Sulzbach, Germany.
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8
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Schönbeck C, Holm R. Exploring the Origins of Enthalpy–Entropy Compensation by Calorimetric Studies of Cyclodextrin Complexes. J Phys Chem B 2019; 123:6686-6693. [DOI: 10.1021/acs.jpcb.9b03393] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Christian Schönbeck
- Department of Science and Environment, Roskilde University, Universitetsvej 1, DK-4000 Roskilde, Denmark
| | - René Holm
- Department of Science and Environment, Roskilde University, Universitetsvej 1, DK-4000 Roskilde, Denmark
- Drug Product Development, Janssen Research and Development, Johnson & Johnson, Turnhoutseweg 30, 2340 Beerse, Belgium
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9
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Weiss-Errico MJ, O’Shea KE. Enhanced host–guest complexation of short chain perfluoroalkyl substances with positively charged β-cyclodextrin derivatives. J INCL PHENOM MACRO 2019. [DOI: 10.1007/s10847-019-00930-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Abstract
Quantification of noncovalent interactions is the key for the understanding of binding mechanisms, of biological systems, for the design of drugs, their delivery and for the design of receptors for separations, sensors, actuators, or smart materials.
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11
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Cheng JG, Yu HJ, Chen Y, Liu Y. Selective binding and controlled release of anticancer drugs by polyanionic cyclodextrins. Bioorg Med Chem 2018; 26:2287-2290. [DOI: 10.1016/j.bmc.2018.03.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 03/08/2018] [Accepted: 03/08/2018] [Indexed: 02/06/2023]
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12
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Schönbeck C. Charge Determines Guest Orientation: A Combined NMR and Molecular Dynamics Study of β-Cyclodextrins and Adamantane Derivatives. J Phys Chem B 2018; 122:4821-4827. [DOI: 10.1021/acs.jpcb.8b02579] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christian Schönbeck
- Department of Science and Environment, Roskilde University, Universitetsvej 1, DK-4000, Roskilde, Denmark
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13
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Vurgun N, Nitz M. Highly Functionalized β-Cyclodextrins by Solid-Supported Synthesis. Chemistry 2018; 24:4459-4467. [PMID: 29389050 DOI: 10.1002/chem.201800028] [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: 01/03/2018] [Indexed: 12/26/2022]
Abstract
Using covalent capture, a high yielding selective mono-functionalization of heptakis-[6-deoxy-6-(2-aminoethylsulfanyl)]-β-CD with a 5-mercaptopentyl functional group has been achieved. Here, we demonstrate the immobilization of the mono-thiol functionalized β-CD on PEGA resin via a disulfide bond, enabling solid-phase elaboration of the remaining six primary amines. To showcase the potential of this method, the amines were elaborated to tripeptides through standard Fmoc-peptide chemistry. A small library of CD-tripeptide conjugates was generated which, when reduced from the solid support, could be tagged at the released thiol with an environmentally sensitive fluorophore. The resulting library of sensors showed potential for the differential sensing of various bile salts. The described methodology provides a rapid and versatile route to synthesize highly functionalized libraries of CD derivatives that may be tailored towards applications in sensing, catalysis, and multivalent displays.
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Affiliation(s)
- Nesrin Vurgun
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
| | - Mark Nitz
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
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14
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Hu Y, Kim H, Shinde VV, Jeong D, Choi Y, Cho E, Jung S. Carboxymethyl cyclosophoraoses as a flexible pH-responsive solubilizer for pindolol. Carbohydr Polym 2017; 175:493-501. [DOI: 10.1016/j.carbpol.2017.08.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 08/04/2017] [Accepted: 08/06/2017] [Indexed: 11/26/2022]
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15
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Agnes M, Thanassoulas A, Stavropoulos P, Nounesis G, Miliotis G, Miriagou V, Athanasiou E, Benkovics G, Malanga M, Yannakopoulou K. Designed positively charged cyclodextrin hosts with enhanced binding of penicillins as carriers for the delivery of antibiotics: The case of oxacillin. Int J Pharm 2017; 531:480-491. [DOI: 10.1016/j.ijpharm.2017.04.080] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Revised: 04/26/2017] [Accepted: 04/30/2017] [Indexed: 02/07/2023]
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16
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Schwarz DH, Engelke A, Wenz G. Solubilizing steroidal drugs by β-cyclodextrin derivatives. Int J Pharm 2017; 531:559-567. [DOI: 10.1016/j.ijpharm.2017.07.046] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Revised: 07/13/2017] [Accepted: 07/14/2017] [Indexed: 11/15/2022]
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17
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Stjern L, Voittonen S, Weldemichel R, Thuresson S, Agnes M, Benkovics G, Fenyvesi É, Malanga M, Yannakopoulou K, Feiler A, Valetti S. Cyclodextrin-mesoporous silica particle composites for controlled antibiotic release. A proof of concept toward colon targeting. Int J Pharm 2017; 531:595-605. [DOI: 10.1016/j.ijpharm.2017.05.062] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 05/24/2017] [Accepted: 05/25/2017] [Indexed: 11/16/2022]
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18
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Blass J, Brunke J, Emmerich F, Przybylski C, Garamus VM, Feoktystov A, Bennewitz R, Wenz G, Albrecht M. Interactions between shape-persistent macromolecules as probed by AFM. Beilstein J Org Chem 2017; 13:938-951. [PMID: 28684975 PMCID: PMC5480325 DOI: 10.3762/bjoc.13.95] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2016] [Accepted: 04/24/2017] [Indexed: 12/15/2022] Open
Abstract
Water-soluble shape-persistent cyclodextrin (CD) polymers with amino-functionalized end groups were prepared starting from diacetylene-modified cyclodextrin monomers by a combined Glaser coupling/click chemistry approach. Structural perfection of the neutral CD polymers and inclusion complex formation with ditopic and monotopic guest molecules were proven by MALDI-TOF and UV-vis measurements. Small-angle neutron and X-ray (SANS/SAXS) scattering experiments confirm the stiffness of the polymer chains with an apparent contour length of about 130 Å. Surface modification of planar silicon wafers as well as AFM tips was realized by covalent bound formation between the terminal amino groups of the CD polymer and a reactive isothiocyanate-silane monolayer. Atomic force measurements of CD polymer decorated surfaces show enhanced supramolecular interaction energies which can be attributed to multiple inclusion complexes based on the rigidity of the polymer backbone and the regular configuration of the CD moieties. Depending on the geometrical configuration of attachment anisotropic adhesion characteristics of the polymer system can be distinguished between a peeling and a shearing mechanism.
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Affiliation(s)
- Johanna Blass
- INM-Leibniz-Institute for New Materials, Saarland University, Campus D 2.2, D-66123 Saarbrücken, Germany
- Physics Department, Saarland University, Campus D 2.2, D-66123 Saarbrücken, Germany
| | - Jessica Brunke
- Organic Macromolecular Chemistry, Saarland University, Campus C 4.2, D-66123 Saarbrücken, Germany
| | - Franziska Emmerich
- INM-Leibniz-Institute for New Materials, Saarland University, Campus D 2.2, D-66123 Saarbrücken, Germany
- Physics Department, Saarland University, Campus D 2.2, D-66123 Saarbrücken, Germany
| | - Cédric Przybylski
- UPMC, IPCM-CNRS UMR 8232, Sorbonne Universités, 75252 Paris Cedex 05, France
| | - Vasil M Garamus
- Helmholtz-Zentrum Geesthacht (HZG), Centre for Materials and Costal Research, Max-Planck-Str. 1, 21502 Geesthacht, Germany
| | - Artem Feoktystov
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85748 Garching, Germany
| | - Roland Bennewitz
- INM-Leibniz-Institute for New Materials, Saarland University, Campus D 2.2, D-66123 Saarbrücken, Germany
- Physics Department, Saarland University, Campus D 2.2, D-66123 Saarbrücken, Germany
| | - Gerhard Wenz
- Organic Macromolecular Chemistry, Saarland University, Campus C 4.2, D-66123 Saarbrücken, Germany
| | - Marcel Albrecht
- Organic Macromolecular Chemistry, Saarland University, Campus C 4.2, D-66123 Saarbrücken, Germany
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19
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Schneider HJ. Spatial mismatch, non-additive binding energies and selectivity in supramolecular complexes. Org Biomol Chem 2017; 15:2146-2151. [DOI: 10.1039/c6ob02755e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A geometric mismatch in supramolecular complexes often leads to deviations from the additivity of binding energies with the consequence of large changes in selectivity and binding mode.
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Affiliation(s)
- Hans-Jörg Schneider
- FR Organische Chemie der Universität des Saarlandes
- D 66123 Saarbrücken
- Germany
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20
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Sun HL, Zhang YM, Chen Y, Liu Y. Polyanionic Cyclodextrin Induced Supramolecular Nanoparticle. Sci Rep 2016; 6:27. [PMID: 28442707 PMCID: PMC5431346 DOI: 10.1038/s41598-016-0026-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 11/11/2016] [Indexed: 12/21/2022] Open
Abstract
Ionizable cyclodextrins have attracted increasing attention in host–guest chemistry and pharmaceutical industry, mainly due to the introduction of favorable electrostatic interactions. The ionizable cyclodextrins could not only enhance its own solubility but also induce oppositely charged guests to form more stable complex. However, the aggregation induced by charged cyclodextrins has rarely been reported. In this work, guided by the concept of molecular-induced aggregation, a series of carboxyl modified cyclodextrins were synthesized via “click” and hydrolysis reaction. Then, UV-vis spectrum was used to investigate the aggregating behaviors induced by these cyclodextrins towards the cationic guest molecules. The results showed that only the hepta-carboxyl-β-cyclodextrin could induce the guest molecules to self-assemble into supramolecular spherical nanoparticles. Meanwhile, it could form stable inclusion complex with amantadine, a drug for anti-Parkinson and antiviral. The assembly behaviors were investigated by dynamic light scattering, scanning electron microscope, atomic force microscope, transmission electron microscope and NMR spectroscopy. The supramolecular nanoparticles induced by hepta-carboxyl-β-CD and its inclusion with amantadine could be used to encapsulate the model drug and achieve its controlled releasing behaviors.
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Affiliation(s)
- He-Lue Sun
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Ying-Ming Zhang
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Yong Chen
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, P. R. China.,Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin, 300071, P. R. China
| | - Yu Liu
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, P. R. China. .,Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin, 300071, P. R. China.
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21
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Zhang YM, Yang Y, Zhang YH, Liu Y. Polysaccharide Nanoparticles for Efficient siRNA Targeting in Cancer Cells by Supramolecular pKa Shift. Sci Rep 2016; 6:28848. [PMID: 27363811 PMCID: PMC4929451 DOI: 10.1038/srep28848] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Accepted: 06/09/2016] [Indexed: 12/21/2022] Open
Abstract
Biomacromolecular pKa shifting is considered as one of the most ubiquitous processes in biochemical events, e.g., the enzyme-catalyzed reaction and protein conformational stabilization. In this paper, we report on the construction of biocompatible polysaccharide nanoparticle with targeting ability and lower toxicity by supramolecular pKa shift strategy. This was realized through a ternary assembly constructed by the dual host‒guest interactions of an adamantane-bis(diamine) conjugate (ADA) with cucurbit[6]uril (CB[6]) and a polysaccharide. The potential application of such biocompatible nanostructure was further implemented by the selective transportation of small interfering RNA (siRNA) in a controlled manner. It is demonstrated that the strong encapsulation of the ADA's diammonium tail by CB[6] not only reduced the cytotoxicity of the nano-scaled vehicle but also dramatically enhanced cation density through an obvious positive macrocycle-induced pKa shift, which eventually facilitated the subsequent siRNA binding. With a targeted polysaccharide shell containing a cyclodextrin‒hyaluronic acid conjugate, macrocycle-incorporated siRNA polyplexes were specifically delivered into malignant human prostate PC-3 cells. The supramolecular polysaccharide nanoparticles, the formation of which was enabled and promoted by the complexation-assisted pKa shift, may be used as a versatile tool for controlled capture and release of biofunctional substrates.
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Affiliation(s)
- Ying-Ming Zhang
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Yang Yang
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Yu-Hui Zhang
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Yu Liu
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, P. R. China
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22
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Abstract
On the basis of many literature measurements, a critical overview is given on essential noncovalent interactions in synthetic supramolecular complexes, accompanied by analyses with selected proteins. The methods, which can be applied to derive binding increments for single noncovalent interactions, start with the evaluation of consistency and additivity with a sufficiently large number of different host-guest complexes by applying linear free energy relations. Other strategies involve the use of double mutant cycles, of molecular balances, of dynamic combinatorial libraries, and of crystal structures. Promises and limitations of these strategies are discussed. Most of the analyses stem from solution studies, but a few also from gas phase. The empirically derived interactions are then presented on the basis of selected complexes with respect to ion pairing, hydrogen bonding, electrostatic contributions, halogen bonding, π-π-stacking, dispersive forces, cation-π and anion-π interactions, and contributions from the hydrophobic effect. Cooperativity in host-guest complexes as well as in self-assembly, and entropy factors are briefly highlighted. Tables with typical values for single noncovalent free energies and polarity parameters are in the Supporting Information.
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Affiliation(s)
- Frank Biedermann
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT) , Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Hans-Jörg Schneider
- FR Organische Chemie der Universität des Saarlandes , D-66041 Saarbrücken, Germany
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23
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Tatar A, Grishina A, Buděšínský M, Kraus T. Per-2,3-O-alkylated β-cyclodextrin duplexes connected with disulfide bonds. Supramol Chem 2016. [DOI: 10.1080/10610278.2016.1164860] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Ameneh Tatar
- Institute of Organic Chemistry and Biochemistry AS CR, v.v.i., Prague 6, Czech Republic
| | - Anastasia Grishina
- Institute of Organic Chemistry and Biochemistry AS CR, v.v.i., Prague 6, Czech Republic
| | - Miloš Buděšínský
- Institute of Organic Chemistry and Biochemistry AS CR, v.v.i., Prague 6, Czech Republic
| | - Tomáš Kraus
- Institute of Organic Chemistry and Biochemistry AS CR, v.v.i., Prague 6, Czech Republic
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24
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Vurgun N, Gómez-Biagi RF, Nitz M. Access to Versatile β-Cyclodextrin Scaffolds through Guest-Mediated Monoacylation. Chemistry 2015; 22:1062-9. [DOI: 10.1002/chem.201503131] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2015] [Indexed: 11/08/2022]
Affiliation(s)
- Nesrin Vurgun
- Department of Chemistry; University of Toronto; 80 St. George Street Toronto Ontario M5S 3H6 Canada
| | - Rodolfo F. Gómez-Biagi
- Department of Chemistry; University of Toronto; 80 St. George Street Toronto Ontario M5S 3H6 Canada
| | - Mark Nitz
- Department of Chemistry; University of Toronto; 80 St. George Street Toronto Ontario M5S 3H6 Canada
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25
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Bozna BL, Blass J, Albrecht M, Hausen F, Wenz G, Bennewitz R. Friction mediated by redox-active supramolecular connector molecules. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:10708-10716. [PMID: 26367352 DOI: 10.1021/acs.langmuir.5b03026] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report on a friction study at the nanometer scale using atomic force microscopy under electrochemical control. Friction arises from the interaction between two surfaces functionalized with cyclodextrin molecules. The interaction is mediated by connector molecules with (ferrocenylmethyl)ammonium end groups forming supramolecular complexes with the cyclodextrin molecules. With ferrocene connector molecules in solution, the friction increases by a factor of up to 12 compared to control experiments without connector molecules. The electrochemical oxidation of ferrocene to ferrocenium causes a decrease in friction owing to the lower stability of ferrocenium-cyclodextrin complex. Upon switching between oxidative and reduction potentials, a change in friction by a factor of 1.2-1.8 is observed. Isothermal titration calorimetry reveals fast dissociation and rebinding kinetics and thus an equilibrium regime for the friction experiments.
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Affiliation(s)
- B L Bozna
- INM - Leibniz-Institute for New Materials, 66123 Saarbrücken, Germany
| | - J Blass
- INM - Leibniz-Institute for New Materials, 66123 Saarbrücken, Germany
| | | | - F Hausen
- INM - Leibniz-Institute for New Materials, 66123 Saarbrücken, Germany
| | | | - R Bennewitz
- INM - Leibniz-Institute for New Materials, 66123 Saarbrücken, Germany
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26
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Mavridis IM, Yannakopoulou K. Anionic cyclodextrins as versatile hosts for pharmaceutical nanotechnology: Synthesis, drug delivery, enantioselectivity, contrast agents for MRI. Int J Pharm 2015; 492:275-90. [DOI: 10.1016/j.ijpharm.2015.06.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 06/03/2015] [Accepted: 06/04/2015] [Indexed: 12/30/2022]
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27
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Blass J, Albrecht M, Bozna BL, Wenz G, Bennewitz R. Dynamic effects in friction and adhesion through cooperative rupture and formation of supramolecular bonds. NANOSCALE 2015; 7:7674-7681. [PMID: 25833225 DOI: 10.1039/c5nr00329f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We introduce a molecular toolkit for studying the dynamics in friction and adhesion from the single molecule level to effects of multivalency. As experimental model system we use supramolecular bonds established by the inclusion of ditopic adamantane connector molecules into two surface-bound cyclodextrin molecules, attached to a tip of an atomic force microscope (AFM) and to a flat silicon surface. The rupture force of a single bond does not depend on the pulling rate, indicating that the fast complexation kinetics of adamantane and cyclodextrin are probed in thermal equilibrium. In contrast, the pull-off force for a group of supramolecular bonds depends on the unloading rate revealing a non-equilibrium situation, an effect discussed as the combined action of multivalency and cantilever inertia effects. Friction forces exhibit a stick-slip characteristic which is explained by the cooperative rupture of groups of host-guest bonds and their rebinding. No dependence of friction on the sliding velocity has been observed in the accessible range of velocities due to fast rebinding and the negligible delay of cantilever response in AFM lateral force measurements.
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Affiliation(s)
- Johanna Blass
- INM - Leibniz Institute of New Materials, Campus D2 2, Saarland University, 66123 Saarbrücken, Germany.
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28
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Hazra S, Kumar GS. Physicochemical properties of inclusion complexes of sanguinarine with natural cyclodextrins: spectroscopy, calorimetry and NMR studies. RSC Adv 2015. [DOI: 10.1039/c4ra10204e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The study addresses interpretation of the various physicochemical properties of inclusion complexes of the anticancer plant alkaloid sanguinarine with natural cyclodextrins.
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Affiliation(s)
- Soumitra Hazra
- Biophysical Chemistry Laboratory
- Chemistry Division
- CSIR-Indian Institute of Chemical Biology
- Kolkata 700 032
- India
| | - Gopinatha Suresh Kumar
- Biophysical Chemistry Laboratory
- Chemistry Division
- CSIR-Indian Institute of Chemical Biology
- Kolkata 700 032
- India
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29
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Blass J, Bozna BL, Albrecht M, Krings JA, Ravoo BJ, Wenz G, Bennewitz R. Switching adhesion and friction by light using photosensitive guest–host interactions. Chem Commun (Camb) 2015; 51:1830-3. [DOI: 10.1039/c4cc09204j] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Friction and adhesion between two β-cyclodextrin functionalized surfaces can be switched reversibly by external light stimuli. The interaction is mediated by complexation with ditopic azobenzene guest molecules.
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Affiliation(s)
- Johanna Blass
- INM - Leibniz-Institute for New Materials
- Saarland University
- 66123 Saarbrücken
- Germany
- Physics Department
| | - Bianca L. Bozna
- INM - Leibniz-Institute for New Materials
- Saarland University
- 66123 Saarbrücken
- Germany
| | - Marcel Albrecht
- Organic Macromolecular Chemistry
- Saarland University
- 66123 Saarbrücken
- Germany
| | | | - Bart Jan Ravoo
- Organic Chemistry Institute
- University of Münster
- 48149 Münster
- Germany
| | - Gerhard Wenz
- Organic Macromolecular Chemistry
- Saarland University
- 66123 Saarbrücken
- Germany
| | - Roland Bennewitz
- INM - Leibniz-Institute for New Materials
- Saarland University
- 66123 Saarbrücken
- Germany
- Physics Department
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30
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Becker LF, Schwarz DH, Wenz G. Synthesis of uniform cyclodextrin thioethers to transport hydrophobic drugs. Beilstein J Org Chem 2014; 10:2920-7. [PMID: 25550759 PMCID: PMC4273231 DOI: 10.3762/bjoc.10.310] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Accepted: 11/23/2014] [Indexed: 01/03/2023] Open
Abstract
Methyl and ethyl thioether groups were introduced at all primary positions of α-, β-, and γ-cyclodextrin by nucleophilic displacement reactions starting from the corresponding per-(6-deoxy-6-bromo)cyclodextrins. Further modification of all 2-OH positions by etherification with iodo terminated triethylene glycol monomethyl ether (and tetraethylene glycol monomethyl ether, respectively) furnished water-soluble hosts. Especially the β-cyclodextrin derivatives exhibit very high binding potentials towards the anaesthetic drugs sevoflurane and halothane. Since the resulting inclusion compounds are highly soluble in water at temperatures ≤37 °C they are good candidates for new aqueous dosage forms which would avoid inhalation anaesthesia.
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Affiliation(s)
- Lisa F Becker
- Organic Macromolecular Chemistry, Saarland University, Campus C4.2, 66123 Saarbrücken, Germany
| | - Dennis H Schwarz
- Organic Macromolecular Chemistry, Saarland University, Campus C4.2, 66123 Saarbrücken, Germany
| | - Gerhard Wenz
- Organic Macromolecular Chemistry, Saarland University, Campus C4.2, 66123 Saarbrücken, Germany
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31
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Extrathermodynamic relations in the binding of charged and neutral substrates to sulfobutylether-β-CDs (SBE-β-CDs) and a 2-hydroxypropyl-β-CD (HP-β-CD). J INCL PHENOM MACRO 2013. [DOI: 10.1007/s10847-013-0374-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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32
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Fourmentin S, Ciobanu A, Landy D, Wenz G. Space filling of β-cyclodextrin and β-cyclodextrin derivatives by volatile hydrophobic guests. Beilstein J Org Chem 2013; 9:1185-91. [PMID: 23843912 PMCID: PMC3701372 DOI: 10.3762/bjoc.9.133] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Accepted: 05/31/2013] [Indexed: 11/23/2022] Open
Abstract
The inclusion of volatile derivatives of benzene and cyclohexane in β-cyclodextrin (β-CD), hydroxypropyl-β-CD, and hydrophilic β-CD-thioethers was investigated by static headspace gas chromatography (HS-GC) and molecular modelling. The obtained binding constants strongly increase with the amount of space filling of the CD cavity and the salt concentration. β-CD thioethers show a 3–10 times higher binding potential than native β-CD.
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Affiliation(s)
- Sophie Fourmentin
- University Lille Nord de France, F-59000 Lille, France ; ULCO, UCEIV, F-59140 Dunkerque, France
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33
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Multilayered textile coating based on a β-cyclodextrin polyelectrolyte for the controlled release of drugs. Carbohydr Polym 2013; 93:718-30. [DOI: 10.1016/j.carbpol.2012.12.055] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2012] [Revised: 12/14/2012] [Accepted: 12/19/2012] [Indexed: 12/30/2022]
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34
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Betulin complex in γ-cyclodextrin derivatives: properties and antineoplasic activities in in vitro and in vivo tumor models. Int J Mol Sci 2012. [PMID: 23203108 PMCID: PMC3509624 DOI: 10.3390/ijms131114992] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Given the present high incidence of melanoma and skin cancer, interest in potential drugs of plant origin has increased significantly. Pentacyclic lupane-type triterpenes are widely distributed in plants, offering numerous pharmacological benefits. Betulin is an important compound in the bark of Betula pendula Roth and has important therapeutic properties, including antitumor activities. Its biological effect is limited by its poor water solubility, which can be improved by cyclodextrin complexation. The best results have been obtained by using a novel cyclodextrin derivative, octakis-[6-deoxy-6-(2-sulfanyl ethanesulfonate)]-γ-CD. The complexes between betulin and the previously mentioned cyclodextrin were analyzed by scanning electron microscopy (SEM)and differential scanning calorimetry (DSC) and pharmacologically evaluated in vitro (MTT and immunocytochemistry tests) and in vivo in C57BL/6J mice. The solubility of betulin is improved by cyclodextrin complexation, which creates a stable complex that improves the in vitro and in vivo properties of the active compound.
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35
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Wenz G. Influence of intramolecular hydrogen bonds on the binding potential of methylated β-cyclodextrin derivatives. Beilstein J Org Chem 2012; 8:1890-5. [PMID: 23209527 PMCID: PMC3511027 DOI: 10.3762/bjoc.8.218] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2012] [Accepted: 10/16/2012] [Indexed: 01/01/2023] Open
Abstract
Various heptasubstituted derivatives of β-cyclodextrin (β-CD) bearing 1, 2 and 3 methyl substituents per glucose unit were synthesized by regioselective methods. Binding free energies and binding enthalpies of these hosts towards 4-tert-butylbenzoate and adamantane-1-carboxylate were determined by isothermal titration microcalorimetry (ITC). It was found that methyl substituents at the secondary positions of β-CD lead to a tremendous reduction of the binding potential, while methylation at the primary positions significantly improved binding. Stabilizing intramolecular hydrogen bonds between the glucose units were made responsible for the high binding potentials of those β-CD derivatives that possess secondary hydroxy groups.
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Affiliation(s)
- Gerhard Wenz
- Organic Macromolecular Chemistry, Saarland University, Campus Saarbrücken C4.2, 66123 Saarbrücken, Germany
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36
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Wang HM, Wenz G. Molecular solubilization of fullerene C(60) in water by γ-cyclodextrin thioethers. Beilstein J Org Chem 2012; 8:1644-51. [PMID: 23209497 PMCID: PMC3510997 DOI: 10.3762/bjoc.8.188] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Accepted: 08/27/2012] [Indexed: 11/23/2022] Open
Abstract
Various hydrophilic γ-cyclodextrin (CD) thioethers, containing neutral or ionic side arms were found to form molecular disperse solutions of C(60) in water reaching concentrations of 15 mg/L. Equilibrium state was approached after seven days without the use of organic cosolvents. The 1:2 stoichiometry of the C(60)/γ-CD thioether complexes was demonstrated by a parabolic phase-solubility diagram. In contrast, native γ-CD forms nanoparticles with C(60). Particle sizes of C(60) were determined by dynamic light scattering.
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Affiliation(s)
- Hai Ming Wang
- Organische Makromolekulare Chemie, Saarland University, Campus Geb. C4.2, D-66123, Saarbrücken, Germany
| | - Gerhard Wenz
- Organische Makromolekulare Chemie, Saarland University, Campus Geb. C4.2, D-66123, Saarbrücken, Germany
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37
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Dandekar P, Jain R, Keil M, Loretz B, Muijs L, Schneider M, Auerbach D, Jung G, Lehr CM, Wenz G. Cellular delivery of polynucleotides by cationic cyclodextrin polyrotaxanes. J Control Release 2012; 164:387-93. [PMID: 22789529 DOI: 10.1016/j.jconrel.2012.06.040] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2012] [Revised: 06/10/2012] [Accepted: 06/30/2012] [Indexed: 11/18/2022]
Abstract
Cationic polyrotaxanes, obtained by temperature activated threading of cationic cyclodextrin derivatives onto water-soluble cationic polymers (ionenes), form metastable nanometric polyplexes with pDNA and combinations of siRNA with pDNA. Because of their low toxicity, the polyrotaxane polyplexes constitute a very interesting system for the transfection of polynucleotides into mammalian cells. The complexation of Cy3-labeled siRNA within the polyplexes was demonstrated by fluorescence correlation spectroscopy. The uptake of the polyplexes (red) was imaged by confocal fluorescence microscopy using the A549 cell line as a model (blue: nuclei, green: membranes). The results prove the potential of polyrotaxanes for further investigations involving knocking down genes of therapeutic interest.
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Affiliation(s)
- Prajakta Dandekar
- Department of Drug Delivery, Helmholtz-Institute for Pharmaceutical Research Saarland, Helmholtz-Center for Infection Research (HZI), Saarland University, D-66123 Saarbrücken, Germany
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38
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How to conduct and interpret ITC experiments accurately for cyclodextrin–guest interactions. Drug Discov Today 2012; 17:623-9. [DOI: 10.1016/j.drudis.2012.01.023] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2011] [Revised: 12/08/2011] [Accepted: 01/26/2012] [Indexed: 01/01/2023]
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39
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Mc Dermott SM, Rooney DA, Breslin CB. Complexation study and spectrofluorometric determination of the binding constant for diquat and p-sulfonatocalix[4]arene. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.03.064] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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40
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Wang HM, Şoica CM, Wenz G. A Comparison Investigation on the Solubilization of Betulin and Betulinic Acid in Cyclodextrin Derivatives. Nat Prod Commun 2012. [DOI: 10.1177/1934578x1200700304] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Betulin (BET) and betulinic acid (BA) are naturally occurring pentacyclic lupane triterpenes, exhibit great promise as bioactive agents for the treatment of many diseases. The poor solubilities of BET and BA in water have limited their applications. In the present work, BET and BA were selected as guest molecules, three hydrophilic γ-cyclodextrin (CD) thioethers were synthesized and selected as host molecules. β-, Hydroxypropyl-β-CD, (HP-β-CD), γ-CD and HP-γ-CD were also investigated as hosts in order to compare the solubilization abilities of these host molecules. The solubilities of BET and BA were estimated from 1H NMR measurements by comparing the relative integral areas of the proton signals between CDs and guests. γ-CD thioethers 5–7 solubilized BET and BA to much higher extends than other host molecules. The obtained maximal solubilities of BET and BA were 5.2 and 4.5 mM, respectively. The topographies of the inclusion compounds were determined by ROESY NMR spectroscopy.
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Affiliation(s)
- Hai Ming Wang
- Organische Makromolekulare Chemie, Saarland University, Geb. C4.2, 66123 Saarbrücken, Germany
| | - Codruta M. Şoica
- University of Medicine and Pharmacy Victor Babeş Timişoara, Faculty of Pharmacy, Eftimie Murgu Square no.2, 300041, Timişoara, Romania
| | - Gerhard Wenz
- Organische Makromolekulare Chemie, Saarland University, Geb. C4.2, 66123 Saarbrücken, Germany
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41
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42
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Lo Meo P, D’Anna F, Gruttadauria M, Riela S, Noto R. Synthesis and characterization of new polyamino-cyclodextrin materials. Carbohydr Res 2012; 347:32-9. [DOI: 10.1016/j.carres.2011.10.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2011] [Revised: 10/07/2011] [Accepted: 10/18/2011] [Indexed: 10/16/2022]
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43
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Wang HM, Wenz G. Solubilization of polycyclic aromatics in water by γ-cyclodextrin derivatives. Chem Asian J 2011; 6:2390-9. [PMID: 21739610 DOI: 10.1002/asia.201100217] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Indexed: 11/07/2022]
Abstract
A series of hydrophilic per-6-thio-6-deoxy-γ-cyclodextrins (CDs) were synthesized from per-6-iodo-6-deoxy-γ-CD. These new hosts are able to solubilize polycyclic aromatic guests in aqueous solution to much higher extents than native CDs. Phase-solubility diagrams were mostly linear in accordance with both 1:1 and 1:2 CD-guest complexes in aqueous solution. The stoichiometry of the inclusion complexes was further investigated by fluorescence spectroscopy, which revealed very pronounced Stokes shifts typical for 1:2 complexes. This finding was further consolidated by quantum mechanical calculations of dimer formation of the guests and space-filling considerations by using the cross-sectional areas of the CDs and guests. The calculated dimerization energies correlated well with the binding free energies measured for the 1:2 complexes, and provided the main contribution to the driving force of complexation in the γ-CD cavity.
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Affiliation(s)
- Hai Ming Wang
- Organische Makromolekulare Chemie, Saarland University, Geb. C4.2, 66123 Saarbrücken, Germany
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44
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Grasso GI, Bellia F, Arena G, Vecchio G, Rizzarelli E. Noncovalent Interaction-Driven Stereoselectivity of Copper(II) Complexes with Cyclodextrin Derivatives of l- and d-Carnosine. Inorg Chem 2011; 50:4917-24. [DOI: 10.1021/ic200132a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Giuseppa Ida Grasso
- Department of Chemistry, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Francesco Bellia
- Department of Chemistry, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Giuseppe Arena
- Department of Chemistry, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Graziella Vecchio
- Department of Chemistry, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Enrico Rizzarelli
- Department of Chemistry, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
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Fotiadou K, Thanassoulas A, Nounesis G, Yannakopoulou K. Cooperative heterodimer formation between per-guadinylated and carboxylated or phosphorylated cyclodextrins in DMSO and DMSO–water studied by NMR spectroscopy and microcalorimetry. Supramol Chem 2011. [DOI: 10.1080/10610278.2010.550918] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Katerina Fotiadou
- a Laboratory of Structural and Supramolecular Chemistry, Institute of Physical Chemistry, National Centre for Scientific Research ‘Demokritos’ , 15310 , Aghia Paraskevi , Greece
| | - Angelos Thanassoulas
- b Biomolecular Physics Laboratory, Institute of Radioisotopes and Radiodiagnostic Products, National Centre for Scientific Research ‘Demokritos’ , 15310 , Aghia Paraskevi , Greece
| | - George Nounesis
- b Biomolecular Physics Laboratory, Institute of Radioisotopes and Radiodiagnostic Products, National Centre for Scientific Research ‘Demokritos’ , 15310 , Aghia Paraskevi , Greece
| | - Konstantina Yannakopoulou
- a Laboratory of Structural and Supramolecular Chemistry, Institute of Physical Chemistry, National Centre for Scientific Research ‘Demokritos’ , 15310 , Aghia Paraskevi , Greece
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46
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Song LX, Pan SZ, Zhu LH, Wang M, Du FY, Chen J. Molecule-Ion Interaction and Its Effect on Coordination Interaction. Inorg Chem 2011; 50:2215-23. [DOI: 10.1021/ic101873w] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Le Xin Song
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Shu Zhen Pan
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Lin Hong Zhu
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Mang Wang
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Fang Yun Du
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Jie Chen
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China
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47
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Gómez-Biagi RF, Nitz M. Mono-acylation of a polyamine-β-cyclodextrin based on guest mediated acyl migration. Chem Commun (Camb) 2011; 47:8614-6. [DOI: 10.1039/c1cc12646f] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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48
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Thiele C, Auerbach D, Jung G, Qiong L, Schneider M, Wenz G. Nanoparticles of anionic starch and cationic cyclodextrin derivatives for the targeted delivery of drugs. Polym Chem 2011. [DOI: 10.1039/c0py00241k] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Abalde-Cela S, Hermida-Ramón JM, Contreras-Carballada P, De Cola L, Guerrero-Martínez A, Alvarez-Puebla RA, Liz-Marzán LM. SERS Chiral Recognition and Quantification of Enantiomers through Cyclodextrin Supramolecular Complexation. Chemphyschem 2010; 12:1529-35. [DOI: 10.1002/cphc.201000800] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2010] [Indexed: 11/07/2022]
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50
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Chen Y, Li F, Liu BW, Jiang BP, Zhang HY, Wang LH, Liu Y. Thermodynamic origin of selective binding of β-cyclodextrin derivatives with chiral chromophoric substituents toward steroids. J Phys Chem B 2010; 114:16147-55. [PMID: 20695496 DOI: 10.1021/jp105821s] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Two β-cyclodextrin derivatives with chiral chromophoric substituents, that is, L- (1) and D-tyrosine-modified β-cyclodextrin (2), were synthesized and fully characterized. Their inclusion modes, binding abilities, and molecular selectivities with four steroid guests, that is, cholic acid sodium salt (CA), deoxycholic acid sodium salt (DCA), glycochoic acid sodium salt (GCA), and taurocholic acid sodium salt (TCA), were investigated by the circular dichroism, 2D NMR, and isothermal titration microcalorimetry (ITC). The results obtained from the circular dichroism and 2D NMR showed that two hosts adopted the different binding geometry, and these differences subsequently resulted in the significant differences of molecular binding abilities and selectivities. As compared with native β-cyclodextrin and tryptophan-modified β-cyclodextrin, host 2 showed the enhanced binding abilities for CA and DCA but the decreased binding abilities for GCA and TCA; however, host 1 showed the decreased binding abilities for all four bile salts. The best guest selectivity and the best host selectivity were K(S)(2-DCA)/K(S)(2-TCA) = 12.6 and K(S)(2-CA)/K(S)(1-CA) = 10, respectively, both exhibiting great enhancement as compared with the corresponding values of the previously reported L- and D-tryptophan-modified β-cyclodextrins. Thermodynamically, it was the favorable enthalpic gain that led to the high guest selectivity and host selectivity.
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Affiliation(s)
- Yong Chen
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, People's Republic of China
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