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Rodríguez M, Silva L, Parajó M, Rodríguez-Dafonte P, García-Río L. Use of dye complexation dynamics to determine α-cyclodextrin host:guest stability constants. J PHYS ORG CHEM 2019. [DOI: 10.1002/poc.3820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- María Rodríguez
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS), Departamento de Química Física; Universidade de Santiago de Compostela; 15782 Santiago Spain
| | - Lara Silva
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS), Departamento de Química Física; Universidade de Santiago de Compostela; 15782 Santiago Spain
| | - Mercedes Parajó
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS), Departamento de Química Física; Universidade de Santiago de Compostela; 15782 Santiago Spain
| | - Pedro Rodríguez-Dafonte
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS), Departamento de Química Física; Universidade de Santiago de Compostela; 15782 Santiago Spain
| | - Luis García-Río
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS), Departamento de Química Física; Universidade de Santiago de Compostela; 15782 Santiago Spain
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2
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Kumar G, Chauhan M. Conductometric investigations of surfactant behavior in aqueous polar aprotic organic additives. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2017.11.090] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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3
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Confinement of 4,4-diaminodiphenyl sulfone by γ -CD in micellar environment: a spectroscopic investigation. J Fluoresc 2013; 24:719-25. [PMID: 24337874 DOI: 10.1007/s10895-013-1344-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Accepted: 12/02/2013] [Indexed: 10/25/2022]
Abstract
This paper reports the double confinement of 4,4-diaminodiphenyl sulfone (Dapsone) inside γ-cyclodextrin (CD) in presence of surfactants (cationic, anionic and nonionic) using steady-state and time-resolved fluorescence spectroscopy. Interpretation of fluorescence spectra, fluorescence anisotropy and time resolved fluorescence decay of the γ-CD • Dapsone•micellar system hints at lesser microviscosity and the partial release of the probe molecule from the supramolecular host-guest complex in ionic micelles, of which greater in cationic micelles, but due to greater restriction and rigidity in presence of non-ionic micelle makes the probe more rigidly inside CD. Changes in computed rotational decay also corroborate the above findings.
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Cabrer PR, Álvarez-Parrilla E, Al-Soufi W, Meijide F, Núñez ER, Tato JV. Complexation of Bile Salts by Natural Cyclodextrins. Supramol Chem 2010. [DOI: 10.1080/1061027031000073207] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Pedro Ramos Cabrer
- a Departamentos de Química Física y Física Aplicada, Facultad de Ciencias , Universidad de Santiago de Compostela , Campus de Lugo, Santiago de Compostela, Spain
| | - Emilio Álvarez-Parrilla
- a Departamentos de Química Física y Física Aplicada, Facultad de Ciencias , Universidad de Santiago de Compostela , Campus de Lugo, Santiago de Compostela, Spain
| | - Wajih Al-Soufi
- a Departamentos de Química Física y Física Aplicada, Facultad de Ciencias , Universidad de Santiago de Compostela , Campus de Lugo, Santiago de Compostela, Spain
| | - Francisco Meijide
- a Departamentos de Química Física y Física Aplicada, Facultad de Ciencias , Universidad de Santiago de Compostela , Campus de Lugo, Santiago de Compostela, Spain
| | - Eugenio Rodríguez Núñez
- a Departamentos de Química Física y Física Aplicada, Facultad de Ciencias , Universidad de Santiago de Compostela , Campus de Lugo, Santiago de Compostela, Spain
| | - José Vázquez Tato
- a Departamentos de Química Física y Física Aplicada, Facultad de Ciencias , Universidad de Santiago de Compostela , Campus de Lugo, Santiago de Compostela, Spain
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Haller J, Kaatze U. Octylglucopyranoside and cyclodextrin in water. Self-aggregation and complex formation. J Phys Chem B 2009; 113:1940-7. [PMID: 19170546 DOI: 10.1021/jp808733p] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
At 25 degrees C ultrasonic attenuation spectra between 100 kHz and 400 MHz as well as sound velocities and densities of aqueous solutions of the surfactant n-octyl-beta-d-glucopyranoside and of the cage compound alpha-cyclodextrin have been measured. The liquid system reveals a critical association concentration (cac) exceeding the cmc of the surfactant almost by the cyclodextrin concentration and thus indicating a significant formation of cyclodextrin-surfactant inclusion complexes. The ultrasonic spectra display altogether four relaxation regions. The one with largest relaxation time (0.27 mus < or = tau(1) < or = 1.6 mus) exhibits a noticeable amplitude at surfactant concentrations larger than the cac only. It is assigned to the monomer exchange between the micelles and the suspending phase. A term with relaxation time tau(2) (33 ns < or = tau(2) < or = 135 ns) is characteristic for solutions containing both solutes. It is assumed to reflect the inclusion complex formation. Complexes with 1:1, 2:1, and 1:2 stoichiometry appear to exist. The terms at higher frequencies (4.8 ns < or = tau(3) < or = 9.8 ns; 0.8 ns <or = tau(4) < or = 2 ns) are due to fluctuations of the carbohydrate residues around the glucosidic bond angles and to the rotational isomerization of the exocyclic hydroxymethyl groups, respectively.
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Affiliation(s)
- Julian Haller
- Drittes Physikalisches Institut, Georg-August-Universitat, Friedrich-Hund-Platz 1, 37077 Gottingen, Germany
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Mukhopadhyay M, Mandal A, Banerjee D, Bhattacharyya SP, Mukherjee S. Effect of surfactant-perturbed nanocaging on the ground and excited state proton transfer reaction. J Phys Chem A 2008; 112:12543-9. [PMID: 19007198 DOI: 10.1021/jp806211v] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The effect of mixed cyclodextrin-surfactant systems on the ground and excited state proton transfer reactions of 4-methyl-2,6-diformylphenol (MFOH) in aqueous solution has been investigated by steady state and time-resolved fluorescence spectroscopy. It has been found that micellar media perturbs the solvation of MFOH and facilitates nanocaging. In the presence of micelle, MFOH preferentially resides in the interfacial region. Depending on the local pH due to compartmentalization of reaction media, normal or anionic form of MFOH dominates. Encapsulation of the probe within the cyclodextrin nanocavity enhances the shorter lifetime component of MFOH unexpectedly, which has been explained on the basis of reduced solvation and reduced dipolar effect due to confinement.
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Affiliation(s)
- M Mukhopadhyay
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
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Mehta S, Bhasin K, Dham S, Singla M. Micellar behavior of aqueous solutions of dodecyldimethylethylammonium bromide, dodecyltrimethylammonium chloride and tetradecyltrimethylammonium chloride in the presence of α-, β-, HPβ- and γ-cyclodextrins. J Colloid Interface Sci 2008; 321:442-51. [DOI: 10.1016/j.jcis.2008.02.030] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2007] [Revised: 02/14/2008] [Accepted: 02/15/2008] [Indexed: 11/28/2022]
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8
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Vlachy N, Touraud D, Kogej K, Kunz W. Solubilization of methacrylic acid based polymers by surfactants in acidic solutions. J Colloid Interface Sci 2007; 315:445-55. [PMID: 17662995 DOI: 10.1016/j.jcis.2007.06.083] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2007] [Revised: 06/29/2007] [Accepted: 06/30/2007] [Indexed: 11/25/2022]
Abstract
The effect of various surfactants on the solubility of methacrylic acid based polyelectrolytes that are insoluble in water at low pH, i.e. isotactic poly(methacrylic acid), i-PMA, Luviflex Soft and Luviflex Silk, was studied by surface tension, fluorescence spectroscopy, potentiometric titration and dynamic light scattering, DLS, measurements. Results show that Luviflex Silk and Luviflex Soft form polymeric micelles in aqueous solutions above a well-defined concentration, whereas both i-PMA and Luviflex Soft undergo a pH-induced conformational transition. The critical association concentration values for each surfactant in the presence of completely ionized polyions were determined. Potentiometric and DLS measurements show that the addition of an anionic and a nonionic surfactant significantly increases the solubility of the polymers at low pH, while the presence of a cationic surfactant results in a formation of an insoluble polymer-surfactant aggregate. The present results could help in regulating the removal of hair-setting polymers by water.
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Affiliation(s)
- Nina Vlachy
- Department of Chemistry and Biochemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana, Askerceva 5, PO Box 537, SI-1000 Ljubljana, Slovenia
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Cano J, Rodriguez A, Aicart E, Junquera E. Temperature effect on the complex formation between tricyclic antidepressant drugs (amitriptyline or imipramine) and hydroxypropyl-β-cyclodextrin in water. J INCL PHENOM MACRO 2007. [DOI: 10.1007/s10847-007-9328-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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10
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García-Río L, Godoy A. Use of Spectra Resolution Methodology to Investigate Surfactant/β-Cyclodextrin Mixed Systems. J Phys Chem B 2007; 111:6400-9. [PMID: 17511497 DOI: 10.1021/jp070780z] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A study of the spectral behavior of crystal violet in mixed systems formed by hexadecyltrimethylammonium chloride (CTACl) and beta-cyclodextrin (beta-CD) has been carried out. The spectra resolution methodology was used to decompose the absorption spectra of crystal violet in the sum of constituent sub-bands centered at 17,953, 16,807, and 16,474 cm(-1). The sub-bands centered at upsilon = 17,953 and 16,807 cm(-1) correspond to planar and pyramidal isomers of the dye in water and the same isomers associated with the cyclodextrin and micelle. The sub-band centered at upsilon = 16,474 cm(-1) is due to the formation of an inclusion complex between the dye and the cyclodextrin, where solvation of the carbocation takes place through the hydroxyl groups of the cyclodextrin and the association of the crystal violet to micelles of CTACl through the formation of ion pairs in the Stern layer. The results obtained in the mixed systems are compatible with the results obtained in the previously studied simple systems, thus supporting the situation where interactions do not exist between cyclodextrins and micelles once these have formed.
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Affiliation(s)
- Luis García-Río
- Departamento de Química Física, Facultad de Química, Universidad de Santiago, 15782 Santiago, Spain.
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Cabaleiro-Lago C, García-Río L, Hervés P, Mejuto JC, Pérez-Juste J. In Search of Fully Uncomplexed Cyclodextrin in the Presence of Micellar Aggregates. J Phys Chem B 2006; 110:15831-8. [PMID: 16898733 DOI: 10.1021/jp0626871] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The chemical behavior of beta-cyclodextrin/nonionic surfactant mixed systems has been investigated using the basic hydrolysis of N-methyl-N-nitroso-p-toluenesulfonamide as a chemical probe. The experimental results prove that at the cmc, there are significant quantities of uncomplexed beta-CD in equilibrium with the micellar aggregates. In contrast to the expected situation, the percentage of uncomplexed beta-CD in equilibrium with the micellar system increases on increasing the hydrophobicity of the surfactant molecule. This behavior is due to the existence of two simultaneous processes: complexation of surfactant monomers by cyclodextrin and the process of self-assembly to form micellar aggregates. The autoaggregation of surfactant monomers is expected to be more important than the complexation process in this mixed system. Varying the hydrophobicity of the surfactant monomer enabled us to determine that the percentages of uncomplexed cyclodextrin in equilibrium with the micellar system were in the range of 5-95%.
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Affiliation(s)
- C Cabaleiro-Lago
- Departamento de Química Física, Facultad de Química, Universidad de Vigo, 36310 Vigo, Spain
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Dorrego B, García-Río L, Hervés P, Leis JR, Mejuto JC, Pérez-Juste J. Changes in the Fraction of Uncomplexed Cyclodextrin in Equilibrium with the Micellar System as a Result of Balance between Micellization and Cyclodextrin−Surfactant Complexation. Cationic Alkylammonium Surfactants. J Phys Chem B 2001. [DOI: 10.1021/jp0035232] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- B. Dorrego
- Departamento Química Física, Facultad de Química, University of Santiago, 15706 Santiago, Spain, and Departamento Química Física, Facultad de Ciencias, University of Vigo, Vigo, Spain
| | - L. García-Río
- Departamento Química Física, Facultad de Química, University of Santiago, 15706 Santiago, Spain, and Departamento Química Física, Facultad de Ciencias, University of Vigo, Vigo, Spain
| | - P. Hervés
- Departamento Química Física, Facultad de Química, University of Santiago, 15706 Santiago, Spain, and Departamento Química Física, Facultad de Ciencias, University of Vigo, Vigo, Spain
| | - J. R. Leis
- Departamento Química Física, Facultad de Química, University of Santiago, 15706 Santiago, Spain, and Departamento Química Física, Facultad de Ciencias, University of Vigo, Vigo, Spain
| | - J. C. Mejuto
- Departamento Química Física, Facultad de Química, University of Santiago, 15706 Santiago, Spain, and Departamento Química Física, Facultad de Ciencias, University of Vigo, Vigo, Spain
| | - J. Pérez-Juste
- Departamento Química Física, Facultad de Química, University of Santiago, 15706 Santiago, Spain, and Departamento Química Física, Facultad de Ciencias, University of Vigo, Vigo, Spain
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13
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Conductivity studies of the molecular encapsulation of sodium perfluoroctanoate by?-cyclodextrin derivatives. ACTA ACUST UNITED AC 1996. [DOI: 10.1007/bf01133381] [Citation(s) in RCA: 9] [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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