1
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Pereira JC, Valente AJ, Söderman O. α-Cyclodextrin affects the acid-base properties of octanoic acid/sodium octanoate. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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2
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Samuelsen L, Larsen D, Schönbeck C, Beeren SR. pH-Responsive templates modulate the dynamic enzymatic synthesis of cyclodextrins. Chem Commun (Camb) 2022; 58:5152-5155. [PMID: 35383788 DOI: 10.1039/d1cc06554h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Product selection in the dynamic enzymatic synthesis of cyclodextrins can be controlled by changing the pH. Using cyclodextrin glucanotransferase to make labile the glycosidic linkages in cyclodextrins (CDs), we generate a dynamic combinatorial library of interconverting linear and cyclic α-1,4-glucans. Templates can be employed to favour the selective production of specific CDs and, herein, we show that by using ionisable templates, the synthesis of α-CD or β-CD can be favoured by simply changing the pH. Using 4-nitrophenol as the template, β-CD is the preferred product at low pH, while α-CD is the preferred product at high pH. Furthermore, a new methodology is described for the simulation of product distributions in dynamic combinatorial libraries with ionisable templates at any given pH.
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Affiliation(s)
- Lisa Samuelsen
- Department of Science and Environment, Roskilde University, Universitetsvej 1, DK-4000 Roskilde, Denmark.,Department of Chemistry, Technical University of Denmark, Kemitorvet building 207, DK-2800 Kongens Lyngby, Denmark.
| | - Dennis Larsen
- Department of Chemistry, Technical University of Denmark, Kemitorvet building 207, DK-2800 Kongens Lyngby, Denmark.
| | - Christian Schönbeck
- Department of Science and Environment, Roskilde University, Universitetsvej 1, DK-4000 Roskilde, Denmark
| | - Sophie R Beeren
- Department of Chemistry, Technical University of Denmark, Kemitorvet building 207, DK-2800 Kongens Lyngby, Denmark.
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3
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Panagiotakis S, Mavroidi B, Athanasopoulos A, Charalambidis G, Coutsolelos AG, Paravatou-Petsotas M, Pelecanou M, Mavridis IM, Yannakopoulou K. Unsymmetrical, monocarboxyalkyl meso-arylporphyrins in the photokilling of breast cancer cells using permethyl-β-cyclodextrin as sequestrant and cell uptake modulator. Carbohydr Polym 2022; 275:118666. [PMID: 34742406 DOI: 10.1016/j.carbpol.2021.118666] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 08/31/2021] [Accepted: 09/12/2021] [Indexed: 11/26/2022]
Abstract
In the search for photosensitizers with chemical handles to facilitate their integration into complex drug delivery nanosystems, new, unsymmetrically substituted, water insoluble meso-tetraphenylporphyrin and meso-tetra(m-hydroxyphenyl)porphyrin derivatives bearing one carboxyalkyl side chain were synthesized. Permethyl-β-cyclodextrin (pMβCD) was their ideal monomerizing host and highly efficient shuttle to transfer them into water. New assembly modes of the extremely stable (Kbinding > 1012 M-2) 2:1 complexes were identified. The complexes are photostable and do not disassemble in FBS-containing cell culture media for 24 h. Incubation of breast cancer MCF-7 cells with the complexes results in intense intracellular fluorescence, strongly enhanced in the endoplasmic reticulum (ER), high photokilling efficiency (~90%) and low dark toxicity. pMβCD stands out as a very capable molecular isolator of mono-carboxyalkyl-arylporphyrins that increases uptake and modulates their localization in the cells. The most efficient porphyrins are envisaged as suitable photosensitizers that can be linked to biocompatible drug carriers for photo- and chemo-therapy applications.
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Affiliation(s)
- Stylianos Panagiotakis
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", Aghia Paraskevi 15341, Attiki, Greece.
| | - Barbara Mavroidi
- Institute of Biosciences & Applications, National Center for Scientific Research "Demokritos", Aghia Paraskevi 15341, Attiki, Greece.
| | - Alexandros Athanasopoulos
- Institute of Biosciences & Applications, National Center for Scientific Research "Demokritos", Aghia Paraskevi 15341, Attiki, Greece.
| | - Georgios Charalambidis
- Laboratory of Bioinorganic Chemistry, Department of Chemistry, University of Crete, Voutes Campus, 70013 Heraklion, Crete, Greece.
| | - Athanassios G Coutsolelos
- Laboratory of Bioinorganic Chemistry, Department of Chemistry, University of Crete, Voutes Campus, 70013 Heraklion, Crete, Greece.
| | - Maria Paravatou-Petsotas
- Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, National Center for Scientific Research "Demokritos", Aghia Paraskevi 15341, Attiki, Greece.
| | - Maria Pelecanou
- Institute of Biosciences & Applications, National Center for Scientific Research "Demokritos", Aghia Paraskevi 15341, Attiki, Greece.
| | - Irene M Mavridis
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", Aghia Paraskevi 15341, Attiki, Greece.
| | - Konstantina Yannakopoulou
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", Aghia Paraskevi 15341, Attiki, Greece.
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Erichsen A, Larsen D, Beeren SR. Chaotropic and Kosmotropic Anions Regulate the Outcome of Enzyme-Mediated Dynamic Combinatorial Libraries of Cyclodextrins in Two Different Ways. Front Chem 2021; 9:721942. [PMID: 34414164 PMCID: PMC8370642 DOI: 10.3389/fchem.2021.721942] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 07/12/2021] [Indexed: 11/22/2022] Open
Abstract
We demonstrate how different anions from across the Hofmeister series can influence the behavior of enzyme-mediated dynamic combinatorial libraries of cyclodextrins (CDs). Using cyclodextrin glucanotransferase to catalyze reversible transglycosylation, dynamic mixtures of interconverting cyclodextrins can be formed wherein the relative concentrations of α-CD, β-CD and γ-CD is determined by their intrinsic stabilities and any stabilizing influences of added template (guest) molecules. Here, we find that addition of high concentrations of kosmotropic anions can be used to enhance the effects of added hydrophobic templates, while chaotropic anions can themselves act as templates, causing predictable and significant changes in the cyclodextrin composition due to weak, but specific, binding interactions with α-CD.
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Affiliation(s)
- Andreas Erichsen
- Department of Chemistry, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Dennis Larsen
- Department of Chemistry, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Sophie R Beeren
- Department of Chemistry, Technical University of Denmark, Kongens Lyngby, Denmark
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5
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Peluso P, Chankvetadze B. Native and substituted cyclodextrins as chiral selectors for capillary electrophoresis enantioseparations: Structures, features, application, and molecular modeling. Electrophoresis 2021; 42:1676-1708. [PMID: 33956995 DOI: 10.1002/elps.202100053] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 03/29/2021] [Accepted: 03/31/2021] [Indexed: 02/06/2023]
Abstract
CDs are cyclic oligosaccharides consisting of α-d-glucopyranosyl units linked through 1,4-linkages, which are obtained from enzymatic degradation of starch. The coexistence of hydrophilic and hydrophobic regions in the same structure makes these macrocycles extremely versatile as complexing host with application in food, cosmetics, environmental, agriculture, textile, pharmaceutical, and chemical industries. Due to their inherent chirality, CDs have been also successfully used as chiral selectors in enantioseparation science, in particular, for CE enantioseparations. In the last decades, multidisciplinary approaches based on CE, NMR spectroscopy, X-ray crystallography, microcalorimetry, and molecular modeling have shed light on some aspects of recognition mechanisms underlying enantiodiscrimination. With the ever growing improvement of computer facilities, hardware and software, computational techniques have become a useful tool to model at molecular level the dynamics of diastereomeric associate formation to sample low-energy conformations, the binding energies between the enantiomer and the CD, and to profile noncovalent interactions contributing to the stability of CD/enantiomer association. On this basis, the aim of this review is to provide the reader with a critical overview on the applications of CDs in CE. In particular, the contemporary theory of the electrophoretic technique and the main structural features of CDs are described, with a specific focus on techniques, methods, and approaches to model CE enantioseparations promoted by native and substituted CDs. A systematic compilation of all published literature has not been attempted.
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Affiliation(s)
- Paola Peluso
- Istituto di Chimica Biomolecolare ICB, CNR, Sede secondaria di Sassari, Traversa La Crucca 3, Li Punti, Sassari, Italy
| | - Bezhan Chankvetadze
- Institute of Physical and Analytical Chemistry, School of Exact and Natural Sciences, Tbilisi State University, Tbilisi, Georgia
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6
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Krishnan SB, Krishnan R, Gopidas KR. Effect ofN-Alkyl Substituents on the Hierarchical Self-Assembly of β-Cyclodextrin-Linked Pyrene-Pyromellitic Diimide Charge-Transfer Complexes. Chemistry 2018; 24:11451-11460. [DOI: 10.1002/chem.201802090] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Indexed: 01/15/2023]
Affiliation(s)
- Sumesh Babu Krishnan
- Photosciences and Photonics Section; Chemical Sciences and Technology Division; CSIR-National Institute for Interdisciplinary Science and Technology; Trivandrum 695 019 India
- Academy of Scientific and Innovative Research (AcSIR); New Delhi 110001 India
| | - Retheesh Krishnan
- Photosciences and Photonics Section; Chemical Sciences and Technology Division; CSIR-National Institute for Interdisciplinary Science and Technology; Trivandrum 695 019 India
- Present address: Department of Chemistry; Government College for Women; Trivandrum 695014 India
| | - Karical Raman Gopidas
- Photosciences and Photonics Section; Chemical Sciences and Technology Division; CSIR-National Institute for Interdisciplinary Science and Technology; Trivandrum 695 019 India
- Academy of Scientific and Innovative Research (AcSIR); New Delhi 110001 India
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7
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Krishnan SB, Gopidas KR. Observation of Supramolecular Chirality in a Hierarchically Self‐Assembled Mixed‐Stack Charge‐Transfer Complex. Chemistry 2017; 23:9600-9606. [DOI: 10.1002/chem.201701123] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Indexed: 01/22/2023]
Affiliation(s)
- Sumesh Babu Krishnan
- Photosciences and Photonics SectionChemical Sciences and Technology DivisionCSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019 India
- Academy of Scientific and Innovative Research (AcSIR) New Delhi 110001 India
| | - Karical Raman Gopidas
- Photosciences and Photonics SectionChemical Sciences and Technology DivisionCSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019 India
- Academy of Scientific and Innovative Research (AcSIR) New Delhi 110001 India
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8
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Holm R, Olesen NE, Alexandersen SD, Dahlgaard BN, Westh P, Mu H. Thermodynamic investigation of the interaction between cyclodextrins and preservatives - Application and verification in a mathematical model to determine the needed preservative surplus in aqueous cyclodextrin formulations. Eur J Pharm Sci 2015; 87:22-9. [PMID: 26391874 DOI: 10.1016/j.ejps.2015.09.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2015] [Revised: 09/17/2015] [Accepted: 09/17/2015] [Indexed: 11/18/2022]
Abstract
Preservatives are inactivated when added to conserve aqueous cyclodextrin (CD) formulations due to complex formation between CDs and the preservative. To maintain the desired conservation effect the preservative needs to be added in apparent surplus to account for this inactivation. The purpose of the present work was to establish a mathematical model, which defines this surplus based upon knowledge of stability constants and the minimal concentration of preservation to inhibit bacterial growth. The stability constants of benzoic acid, methyl- and propyl-paraben with different frequently used βCDs were determined by isothermal titration calorimetry. Based upon this knowledge mathematical models were constructed to account for the equilibrium systems and to calculate the required concentration of the preservations, which was evaluated experimentally based upon the USP/Ph. Eur./JP monograph. The mathematical calculations were able to predict the needed concentration of preservation in the presence of CDs; it clearly demonstrated the usefulness of including all underlying chemical equilibria in a mathematical model, such that the formulation design can be based on quantitative arguments.
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Affiliation(s)
- René Holm
- Biologics and Pharmaceutical Science, H. Lundbeck A/S, Ottiliavej 9, DK-2500 Valby, Denmark; Department of Pharmacy, Faculty of Health and Medical Sciences, Copenhagen University, Universitetsparken 2, DK-2100 Copenhagen, Denmark.
| | - Niels Erik Olesen
- Biologics and Pharmaceutical Science, H. Lundbeck A/S, Ottiliavej 9, DK-2500 Valby, Denmark; NSM, Research Unit for Functional Biomaterials, Roskilde University, Universitetsvej 1, DK-4000 Roskilde, Denmark
| | - Signe Dalgaard Alexandersen
- Biologics and Pharmaceutical Science, H. Lundbeck A/S, Ottiliavej 9, DK-2500 Valby, Denmark; Department of Pharmacy, Faculty of Health and Medical Sciences, Copenhagen University, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Birgitte N Dahlgaard
- Pharmaceutical Development, H. Lundbeck A/S, Ottiliavej 9, DK-2500 Valby, Denmark
| | - Peter Westh
- NSM, Research Unit for Functional Biomaterials, Roskilde University, Universitetsvej 1, DK-4000 Roskilde, Denmark
| | - Huiling Mu
- Department of Pharmacy, Faculty of Health and Medical Sciences, Copenhagen University, Universitetsparken 2, DK-2100 Copenhagen, Denmark
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9
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Lopedota A, Cutrignelli A, Laquintana V, Franco M, Donelli D, Ragni L, Tongiani S, Denora N. β-cyclodextrin in personal care formulations: role on the complexation of malodours causing molecules. Int J Cosmet Sci 2015; 37:438-45. [DOI: 10.1111/ics.12215] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Accepted: 02/07/2015] [Indexed: 11/28/2022]
Affiliation(s)
- A. Lopedota
- Department of Pharmacy-Drug Sciences; University of Bari “Aldo Moro”; 4 Orabona Street 70125 Bari Italy
| | - A. Cutrignelli
- Department of Pharmacy-Drug Sciences; University of Bari “Aldo Moro”; 4 Orabona Street 70125 Bari Italy
| | - V. Laquintana
- Department of Pharmacy-Drug Sciences; University of Bari “Aldo Moro”; 4 Orabona Street 70125 Bari Italy
| | - M. Franco
- Department of Pharmacy-Drug Sciences; University of Bari “Aldo Moro”; 4 Orabona Street 70125 Bari Italy
| | - D. Donelli
- ACRAF Angelini Research Center; Piazzale della Stazione 00040 Santa Palomba Roma Italy
| | - L. Ragni
- ACRAF Angelini Research Center; Piazzale della Stazione 00040 Santa Palomba Roma Italy
| | - S. Tongiani
- ACRAF Angelini Research Center; Piazzale della Stazione 00040 Santa Palomba Roma Italy
| | - N. Denora
- Department of Pharmacy-Drug Sciences; University of Bari “Aldo Moro”; 4 Orabona Street 70125 Bari Italy
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López-Nicolás JM, Rodríguez-Bonilla P, García-Carmona F. Cyclodextrins and Antioxidants. Crit Rev Food Sci Nutr 2013; 54:251-76. [DOI: 10.1080/10408398.2011.582544] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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11
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6-Hydroxymethyltriazolyl-6-deoxy-β-cyclodextrin: a highly water soluble and structurally well-defined β-cyclodextrin click cluster. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.08.073] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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12
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Konkena B, Vasudevan S. Covalently linked, water-dispersible, cyclodextrin: reduced-graphene oxide sheets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:12432-7. [PMID: 22873345 DOI: 10.1021/la3020783] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Reduced-graphene oxide (rGO) sheets have been functionalized by covalently linking β-cyclodextrin (β-CD) cavities to the sheets via an amide linkage. The functionalized β-CD:rGO sheets, in contrast to rGO, are dispersible over a wide range of pH values (2-13). Zeta potential measurements indicate that there is more than one factor responsible for the dispersibility. We show here that planar aromatic molecules adsorbed on the rGO sheet as well as nonplanar molecules included in the tethered β-CD cavities have their fluorescence effectively quenched by the β-CD:rGO sheets. The β-CD:rGO sheets combine the hydrophobicity associated with rGO along with the hydrophobicity of the cyclodextrin cavities in a single water-dispersible material.
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Affiliation(s)
- Bharathi Konkena
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
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13
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Terekhova I, Koźbiał M, Kumeev R, Gierycz P. Complex formation of native and hydroxypropylated cyclodextrins with benzoic acid in aqueous solution: Volumetric and 1H NMR study. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.08.074] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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15
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Domi Y, Ikeura K, Okamura K, Shimazu K, Porter MD. Strong inclusion of inorganic anions into β-cyclodextrin immobilized to gold electrode. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:10580-10586. [PMID: 21728339 DOI: 10.1021/la1051063] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The inclusion of inorganic anions such as SO(4)(2-), NO(3)(-), and HPO(4)(2-) into the cavity of β-cyclodextrin monolayers on Au was examined by X-ray photoelectron spectroscopy (XPS), a quartz crystal microbalance (QCM), and chronocoulometric measurements of the competitive inclusion with ferrocene. The inclusion amounts of ferrocence in 0.2 M Na(2)SO(4), NaNO(3), and Na(2)HPO(4) solutions were less than 6% of the adsorption amount of β-cyclodextrin on Au, resulting in the apparent inhibition of the ferrocene redox reaction. The surface association constants of these anions reached about 10 on a logarithmic scale and were much higher than those for the inclusion of common organic guest compounds. A stronger anion inclusion was also demonstrated by the QCM response corresponding to the replacement of a preincluded organic guest with sulfate upon the injection of the sulfate solution. Quantitative analysis of the XPS data suggested a 1:1 association for each of these anions per surface β-cyclodextrin. There was no detectable inclusion for ClO(4)(-), Cl(-), and Br(-).
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Affiliation(s)
- Yasuhiro Domi
- Division of Environmental Materials Science, Graduate School of Environmental Science, Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan
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Othman M, Bouchemal K, Couvreur P, Desmaële D, Morvan E, Pouget T, Gref R. A comprehensive study of the spontaneous formation of nanoassemblies in water by a “lock-and-key” interaction between two associative polymers. J Colloid Interface Sci 2011; 354:517-27. [DOI: 10.1016/j.jcis.2010.11.015] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2010] [Revised: 11/05/2010] [Accepted: 11/09/2010] [Indexed: 11/17/2022]
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17
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Polyphenol characterization and encapsulation in β-cyclodextrin of a flavonoid-rich Hypericum perforatum (St John's wort) extract. Lebensm Wiss Technol 2010. [DOI: 10.1016/j.lwt.2010.01.016] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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18
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Tawarah KM, Wazwaz AA. A Conductance Study of the Binding of Methyl Orange, o-Methyl Red and p-Methyl Red Anions by β-Cyclodextrin in Water. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19930970513] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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19
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Fontana A, Viale M, Guernelli S, Gasbarri C, Rizzato E, Maccagno M, Petrillo G, Aiello C, Ferrini S, Spinelli D. Strategies for improving the water solubility of new antitumour nitronaphthylbutadiene derivatives. Org Biomol Chem 2010; 8:5674-81. [DOI: 10.1039/c0ob00493f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Song LX, Wang HM, Xu P, Zhang ZQ, Liu QQ. Formation, Structure, and Stability of α- and β-Cyclodextrin Inclusion Complexes of Phenol and Benzoic Acid Derivatives in Vacuo and in Water. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2007. [DOI: 10.1246/bcsj.80.2313] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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21
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Kano K, Ishida Y, Kitagawa K, Yasuda M, Watanabe M. Heat-Capacity Changes in Host–Guest Complexation by Coulomb Interactions in Aqueous Solution. Chem Asian J 2007; 2:1305-13. [PMID: 17668911 DOI: 10.1002/asia.200700142] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Heat-capacity changes (deltaC(p)0) were determined for the complexation of 1-alkanecarboxylates with protonated hexakis(6-amino-6-deoxy)-alpha-cyclodextrin (per-NH3(+)-alpha-CD) and heptakis(6-amino-6-deoxy)-beta-cyclodextrin (per-NH3(+)-beta-CD). DeltaC(p)0 decreased with an increase in the binding constant (K) and plateaued at K = 4000 M(-1). The complexes of 1-pentanoate, 1-hexanoate, and 1-heptanoate with per-NH3(+)-alpha-CD are classified as the host-guest system in which the size of the guest fits the CD cavity well. In such a system, van der Waals interaction is the major force for complexation, leading to a negative deltaH0 value. Simultaneously, the water molecules around the hydrophobic alkyl chain of the guest and inside the CD cavity are released to the aqueous bulk phase, leading to a positive deltaS0 value. The negative deltaC(p)0 value in such complexation is ascribed to dehydration of the hydrophobic alkyl chain of the guest and extrusion of the water molecules inside the CD cavity. Meanwhile, the complexes that show positive deltaC(p)0 values are characterized by complexation in which the guest molecules are significantly smaller than the CD cavities. In such a case, the complexation is endothermic and driven by the entropy gain. When the guest is much smaller than the CD cavity, the main binding force should be Coulomb interaction. To form an ionic bond, dehydration of the charged groups must occur. This process is endothermic and leads to positive deltaH0 and deltaS0 values. As the top of the CD cavity is capped by a small but hydrophobic alkyl chain, the water molecules inside the CD cavity may form the iceberg structure. This process must be accompanied by a positive deltaC(p)0 value. Hence, the complexation of a small guest with the CD with a large cavity through Coulomb interactions shows positive and large deltaC(p)0 values. These conclusions were applied to the electrostatic binding of proteins with an anionic ligand.
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Affiliation(s)
- Koji Kano
- Department of Molecular Science and Technology, Faculty of Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan.
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Wang HM, Song LX. A Good Linear Relationship between the Logarithms of Formation Constants and the Stabilization Energies of α- and β-Cyclodextrin Complexes of Several Phenol and Benzoic Derivatives. CHEM LETT 2007. [DOI: 10.1246/cl.2007.596] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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23
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Daoud-Mahammed S, Ringard-Lefebvre C, Razzouq N, Rosilio V, Gillet B, Couvreur P, Amiel C, Gref R. Spontaneous association of hydrophobized dextran and poly-β-cyclodextrin into nanoassemblies. J Colloid Interface Sci 2007; 307:83-93. [PMID: 17126360 DOI: 10.1016/j.jcis.2006.10.072] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2006] [Revised: 09/29/2006] [Accepted: 10/30/2006] [Indexed: 11/24/2022]
Abstract
New nanoassemblies were instantaneously prepared by mixing two aqueous solutions, one containing a beta-cyclodextrin polymer (pbetaCD), and the other a hydrophobically modified by alkyl chains dextran (MD). The formation mechanism and the inner structure of these nanoassemblies were analysed using surface tension measurements and (1)H NMR spectroscopy. The effect of a hydrophobic guest molecule, such as benzophenone (BZ), on the formation and stability of the nanoassemblies was also evaluated. MD exhibited the typical behaviour of a soluble amphiphilic molecule and adsorbed at the air/water interface. Whereas the injection of native beta-CDs in the solution beneath the adsorbed MD monolayer did not produce any change in the surface tension, that of the pbetaCD resulted in an increase in the surface tension, indicating the desorption of the polymer from the interface. This result accounts for a cooperative effect of beta-CDs linked together in the pbetaCD polymer on dextran desorption. The presence of benzophenone in the system hindered the sequestration of dextran alkyl moieties by beta-CD in the polymer without impeding the formation of associative nanoassemblies of 100-200 nm. (1)H NMR investigations demonstrated that, in the BZ-loaded nanoassemblies, the hydrophobic molecule was mainly located into the cyclodextrin cavities.
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Daoud-Mahammed S, Couvreur P, Gref R. Novel self-assembling nanogels: Stability and lyophilisation studies. Int J Pharm 2007; 332:185-91. [PMID: 17116379 DOI: 10.1016/j.ijpharm.2006.09.052] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2006] [Revised: 09/14/2006] [Accepted: 09/21/2006] [Indexed: 11/22/2022]
Abstract
The stability of new supramolecular nanoassemblies (nanogels), based on the association of a hydrophobically modified dextran (MD) and a beta-cyclodextrin polymer (pbetaCD), has been studied by two complementary methods: (i) size measurements and (ii) turbidity experiments using a Turbiscan optical analyser. Nanogels of about 120-150nm were obtained whatever the concentration of the two polymer solutions. At low concentrations, the suspensions presented little mean diameter variations upon storage. However, the concentrated ones tended to destabilize and their mean diameter increased upon time. Size measurements and Turbiscan investigations have demonstrated that destabilization in the MD-pbetaCD nanogel suspension was only due to particle aggregation and/or fusion, as no sedimentation or creaming occurred. The destabilization of MD-pbetaCD suspensions led to the formation of a highly viscous phase, as a final state. Moreover, the two methods have shown that aggregation and/or fusion phenomena were more pronounced in the concentrated MD-pbetaCD suspensions than in the diluted ones. The stability of MD-pbetaCD suspensions could be improved by their storage at 4 degrees C. Finally, freeze-drying was found to be a convenient method for the long-time storage of MD-pbetaCD nanoassemblies.
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Nishikawa S, Kondo M. Kinetic Study for the Inclusion Complex of Carboxylic Acids with Cyclodextrin by the Ultrasonic Relaxation Method. J Phys Chem B 2006; 110:26143-7. [PMID: 17181269 DOI: 10.1021/jp068081u] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ultrasonic absorption coefficients in the frequency range of 0.8-95 MHz were measured in aqueous solutions containing both beta-cyclodextrin (beta-CD) (host) and butanoic acid (in its dissociated form and undissociated one) (guest). A single relaxational phenomenon was observed only when the solutes were coexisting, although no relaxation was found in the beta-CD solution or in the acid solutions. The absorption was also measured in a solution of pentanoic acid (dissociated form) with beta-CD, and single relaxation was detected. The ultrasonic relaxation observed in these solutions was due to a perturbation of a chemical equilibrium related to a reaction of an inclusion complex formed by the host and guest. The equilibrium constant was obtained from the dependence of the maximum absorption per wavelength on the guest concentration. The rate constant for the inclusion process of the guest into a cavity of beta-CD and that for the leaving process from the cavity were determined from the obtained relaxation frequency and the equilibrium constant. The standard volume change of the reaction was also computed from the maximum absorption per wavelength. These results were compared with those in solutions containing both beta-CD and different guest molecules. It was found that the hydrophobicity of guest molecules played an important role in the formation of the inclusion complex and also that the charge on the carboxylic group had a considerable effect on the kinetic characteristics of the complexation reaction.
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Affiliation(s)
- Sadakatsu Nishikawa
- Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, Saga, 840-8502, Japan. nishikas@ cc.saga-u.ac.jp
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Dias AMA, Andrade-Dias C, Lima S, Coutinho JAP, Teixeira-Dias JJC, Marrucho IM. How does β-cyclodextrin affect oxygen solubility in aqueous solutions of sodium perfluoroheptanoate? J Colloid Interface Sci 2006; 303:552-6. [PMID: 16935292 DOI: 10.1016/j.jcis.2006.07.074] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2006] [Revised: 07/26/2006] [Accepted: 07/28/2006] [Indexed: 11/27/2022]
Abstract
The solubility of oxygen in aqueous solutions of sodium perfluoroheptanoate (NaPFHept) at different concentrations was measured at 310.15 K with an apparatus based on the saturation method. The effect of adding beta-cyclodextrin (betaCD) on the solubility of oxygen was also studied. Conductimetry measurements showed that the presence of betaCD in aqueous solutions of NaPFHept increases its critical micellar concentration (CMC). In the presence of betaCD (15 mM), the characteristic minimum of oxygen solubility observed at the CMC is shifted from 83 to 114 mM, and the curvature at the minimum is reduced to 64% of the value in the absence of betaCD. Chemical shift changes for the H5 protons of betaCD, recorded as functions of the initial concentration of NaPFHept, point to the formation of a relatively strong 1:1 inclusion in betaCD of the perfluoroheptanoate anion. Hence, it is suggest that the effect of adding betaCD on the solubility of oxygen cannot be accounted for only by the perfluoroheptanoate anion inclusion in betaCD, but has to be ascribed to the direct influence of this inclusion complex on disrupting the aggregation process reducing the increase of oxygen solubility after the CMC value.
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Affiliation(s)
- A M A Dias
- Department of Chemistry, University of Aveiro, CICECO, P3810-193 Aveiro, Portugal
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Gref R, Amiel C, Molinard K, Daoud-Mahammed S, Sébille B, Gillet B, Beloeil JC, Ringard C, Rosilio V, Poupaert J, Couvreur P. New self-assembled nanogels based on host–guest interactions: Characterization and drug loading. J Control Release 2006; 111:316-24. [PMID: 16504334 DOI: 10.1016/j.jconrel.2005.12.025] [Citation(s) in RCA: 124] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2005] [Revised: 12/16/2005] [Accepted: 12/22/2005] [Indexed: 11/28/2022]
Abstract
We show here, for the first time, that two neutral polymers may completely associate together in water to spontaneously form supramolecular nanoassemblies (nanogels) of spherical shape. The cohesion of these stable structures of about 200 nm is based upon a "lock and key" mechanism: inclusion complexes are formed between the hydrophobic alkyl chains grafted on a polysaccharide (dextran) and the molecular cavities contained in a poly-cyclodextrin polymer. Production yields reached 95%. It was established that all the alkyl chains were included within the cyclodextrins' cavities in these nanoassemblies. The multivalent character of the interactions between the two polymers ensures the stability of the nanoassemblies. Moreover, empty cyclodextrin units remained accessible for the inclusion of compounds of interest such as benzophenon or tamoxifen.
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Affiliation(s)
- Ruxandra Gref
- School of Pharmacy, Université Paris Sud, UMR CNRS 8612, 5 Rue J. B. Clément, 92290 Châtenay Malabry, France.
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Chiral discrimination of ibuprofen isomers in β-cyclodextrin inclusion complexes: experimental (NMR) and theoretical (MD, MM/GBSA) studies. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.02.010] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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29
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Castronuovo G, Niccoli M. Complexation of natural and methylated β-cyclodextrins with long-chain Carboxylic acids in aqueous solutions. Calorimetric studies at 298 K. J INCL PHENOM MACRO 2005. [DOI: 10.1007/s10847-005-0995-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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30
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Influence of the Solvation Upon the Reaction of α-Cyclodextrin with Carboxylic Acids, Their Methyl Esters, and Their Sodium Salts in Aqueous Solution Studied by Calorimetric Measurements. J SOLUTION CHEM 2005. [DOI: 10.1007/s10953-005-4498-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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31
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13C NMR Spectroscopy on the Complexation of ?-Cyclodextrin with 1-Alkanols and 1-Alkanoate Ions. J INCL PHENOM MACRO 2004. [DOI: 10.1007/s10847-003-8834-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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32
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Ohtsuki H, Kamei K, Nagata T, Yamamoto T, Matsui Y. 13C NMR Spectroscopy on the Complexation of ?-Cyclodextrin with 1-Alkanols and 1-Alkanoate Ions. J INCL PHENOM MACRO 2004. [DOI: 10.1007/s10847-004-8834-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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33
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Sainz-Rozas PR, Isasi JR, Sánchez M, Tardajos G. Effects of Natural Cyclodextrins on the Photophysical Properties of Dibenzofuran-2-carboxylic Acid. J Phys Chem A 2003. [DOI: 10.1021/jp035939w] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pablo R. Sainz-Rozas
- Departamento de Química y Edafología, Universidad de Navarra, 31080 Pamplona, Navarra, Spain
| | - José Ramón Isasi
- Departamento de Química y Edafología, Universidad de Navarra, 31080 Pamplona, Navarra, Spain
| | - Miguel Sánchez
- Departamento de Química y Edafología, Universidad de Navarra, 31080 Pamplona, Navarra, Spain
| | - Gloria Tardajos
- Departamento de Química y Edafología, Universidad de Navarra, 31080 Pamplona, Navarra, Spain
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Abstract
This paper synthesises the literature on interactions between cyclodextrins (CD) and fatty acids and glycerides, and explains how these interactions allow the use of cyclodextrins to stabilise emulsions. An example of formulation with cyclodextrins is given which discusses the preparation of simple o/w emulsions, the addition of a model active ingredient, and the preparation of multiple emulsions in the absence of preformed surface active agents.
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Affiliation(s)
- Dominique Duchêne
- UMR CNRS 8612, Physico-chimie, Pharmacotechnie, Biopharmacie, Faculté de Pharmacie, Université Paris-Sud, 5, Rue Jean Baptiste Clément, 92290 Châtenay Malabry, France.
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35
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De Lisi R, Lazzara G, Milioto S, Muratore N. Volumes and heat capacities of the aqueous sodium dodecanoate/sodium perfluorooctanoate mixtures in the presence of β-cyclodextrin. Phys Chem Chem Phys 2003. [DOI: 10.1039/b308354c] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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González-Gaitano G, Crespo A, Tardajos G. Thermodynamic Investigation (Volume and Compressibility) of the Systems β-Cyclodextrin + n-Alkyltrimethylammonium Bromides + Water. J Phys Chem B 2000. [DOI: 10.1021/jp9926995] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- G. González-Gaitano
- Departamento de Química y Edafología (sección de Química Física), Facultad de Ciencias, Universidad de Navarra, 31080 Pamplona, Spain and Departamento de Química-Física I, Facultad de Químicas, Universidad Complutense, 28040 Madrid, Spain
| | - A. Crespo
- Departamento de Química y Edafología (sección de Química Física), Facultad de Ciencias, Universidad de Navarra, 31080 Pamplona, Spain and Departamento de Química-Física I, Facultad de Químicas, Universidad Complutense, 28040 Madrid, Spain
| | - G. Tardajos
- Departamento de Química y Edafología (sección de Química Física), Facultad de Ciencias, Universidad de Navarra, 31080 Pamplona, Spain and Departamento de Química-Física I, Facultad de Químicas, Universidad Complutense, 28040 Madrid, Spain
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Díaz D, Escobar Llanos CM, Bernad Bernad MJ, Gracia Mora J. Binding, molecular mechanics, and thermodynamics of cyclodextrin inclusion complexes with ketoprofen in aqueous medium. Pharm Dev Technol 1998; 3:307-13. [PMID: 9742551 DOI: 10.3109/10837459809009858] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The purpose of this work was to study the interaction forces involved in the inclusion processes of ketoprofen with several cyclodextrins and to assess the best cyclodextrin for complexing this anti-inflammatory drug. The behavior of the inclusion complexes of ketoprofen with alpha-, beta-, and gamma-cyclodextrins was studied by UV-VIS direct spectroscopy, 1H NMR, and molecular mechanics. Thermodynamic parameters for the binding processes were obtained from the temperature variations in binding constants, which manifest that "nonclassical" hydrophobic interactions are the main forces involved in these inclusion processes. Binding constants show that beta- and gamma-cyclodextrins form more stable 1:1 complexes with ketoprofen than does alpha-cyclodextrin. 1H NMR spectra show that the inclusion degree depends on the size of the internal diameter of cyclodextrin. The geometries calculated on the bases of molecular mechanics for these three-dimensional models indicate high stability.
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Affiliation(s)
- D Díaz
- Facultad de Química, Departamento de Química Inorgánica, UNAM, México D.F., México.
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38
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Wilson LD, Verrall RE. A 1H NMR study of cyclodextrin - hydrocarbon surfactant inclusion complexes in aqueous solutions. CAN J CHEM 1998. [DOI: 10.1139/v97-208] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A 1H NMR chemical shift ( delta ) study of a homologous series of hydrocarbon (hc) (CxH2x + 1CO2Na, x = 5, 7, 9, 11, 13) surfactants (S) has been carried out in water and in binary solvent (D2O + cyclodextrin (CD)) systems at 22°C. Complementary 1H NMR chemical shift ( delta ) data of the cyclodextrins in binary (D2O + S) systems containing hc surfactants have also been obtained. Complex induced shift (CIS) values for selected host or guest protons were found to increase as the alkyl chain (Cx) length of the surfactant increased. The CIS values are found to depend on the following factors: (i) the magnitude of the binding constant (Ki, i = 1:1, 2:1), (ii) the chain length of the surfactant, (iii) the mole ratio of the host to guest species, (iv) the host-guest stoichiometry, and (v) the host-guest inclusion geometry. The CIS values of the CD-S systems have been analyzed using equilibrium models in which 1:1 complexes, 1:1 plus 2:1 complexes, and uncomplexed species are present. Differences in the binding affinity, stoichiometry, and inclusion geometry of the complexes formed between a given hc surfactant and the various cyclodextrins were observed.Key words: cyclodextrin, surfactant, NMR, chemical shift, complex, binding constant.
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39
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Affiliation(s)
- Kenneth A. Connors
- School of Pharmacy, University of Wisconsin, 425 North Charter Street, Madison, Wisconsin 53706
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40
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Godínez LA, Schwartz L, Criss CM, Kaifer AE. Thermodynamic Studies on the Cyclodextrin Complexation of Aromatic and Aliphatic Guests in Water and Water−Urea Mixtures. Experimental Evidence for the Interaction of Urea with Arene Surfaces. J Phys Chem B 1997. [DOI: 10.1021/jp970359i] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Luis A. Godínez
- Chemistry Department, University of Miami, Coral Gables, Florida 33124-0431
| | - Lauren Schwartz
- Chemistry Department, University of Miami, Coral Gables, Florida 33124-0431
| | - Cecil M. Criss
- Chemistry Department, University of Miami, Coral Gables, Florida 33124-0431
| | - Angel E. Kaifer
- Chemistry Department, University of Miami, Coral Gables, Florida 33124-0431
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41
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Gadre A, Rüdiger V, Schneider HJ, Connors KA. Binding of cyclodextrins to alicyclic and aromatic substrates: complex formation of alpha-, beta-, and gamma-cyclodextrins with substituted cyclohexanecarboxylic acids and phenylalkanoic acids. J Pharm Sci 1997; 86:236-43. [PMID: 9040102 DOI: 10.1021/js960202m] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Complex binding constants of the three native cyclodextrins with seven cyclohexane derivatives (all possessing the carboxylic acid group) and with the series C6H5(CH2)nCOOH (n = 0 to 4) were measured in aqueous solution at 25 degrees C by potentiometry and the solubility method. These results, combined with literature data, indicate that alpha- and gamma-cyclodextrins bind with comparable strength to both the cyclohexyl and phenyl moieties, with beta-cyclodextrin binding significantly more strongly. These acid series are compared with several series CH3(CH2)nX, where X is CH3, COOH, COO-, OH, SO3-, etc., and it is concluded that the X group (for X other than methyl) contributes appreciably to complex stability, perhaps by means of an extracavity interaction. The COOH group provides a further augmentation of complex stability. NMR CIS and ROESY results indicate the presence of isomeric complexes in both the cyclohexyl and phenylalkanoic series, and clearly demonstrate the existence of intracavity inclusion. An NOE study of the alpha-cyclodextrin: cyclohexanecarboxylate system provides evidence for inclusion combined with interaction outside (that is, at the rim of) the cavity.
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Affiliation(s)
- A Gadre
- School of Pharmacy, University of Wisconsin, Madison 53706, USA
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42
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Davies DM, Deary ME. The interaction of α-cyclodextrin with aliphatic, aromatic and inorganic peracids, the corresponding parent acids and their respective anions. ACTA ACUST UNITED AC 1996. [DOI: 10.1039/p29960002415] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Gelb RI, Alper JS. Compensation effects in the complexation reactions of ?- and ?-cyclodextrin. J PHYS ORG CHEM 1995. [DOI: 10.1002/poc.610081209] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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44
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Hamasaki K, Ueno A, Toda F, Suzuki I, Osa T. Molecular Recognition Indicators of Modified Cyclodextrins Using Twisted Intramolecular Charge Transfer Fluorescence. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1994. [DOI: 10.1246/bcsj.67.516] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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45
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Kutner W, Doblhofer K. Simultaneous cyclic voltammetry and electrochemical quartz-crystal microbalance study at polymer film-modified electrodes of molecular inclusion of ferrocene by β-cyclodextrin polymer and carboxymethylated β-cyclodextrin polymer as well as ferrocenecarboxylic acid by β-cyclodextrin polymer. J Electroanal Chem (Lausanne) 1992. [DOI: 10.1016/0022-0728(92)80509-3] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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46
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Yatsimirsky AK, Eliseev AV. Contributions of electrostatic and hydrophobic interactions to the host–guest complexation of pyrocatecholate anions with cationic cyclodextrins. ACTA ACUST UNITED AC 1991. [DOI: 10.1039/p29910001769] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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47
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Saint Aman E, Serve D. A conductimetric study of the association between cyclodextrins and surfactants—application to the electrochemical study of a mixed aqueous system: Substrate, cyclodextrin, surfactant. J Colloid Interface Sci 1990. [DOI: 10.1016/0021-9797(90)90219-e] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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