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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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3
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Petek A, Krajnc M, Petek A. Study of host–guest interaction between ß-cyclodextrin and alkyltrimethylammonium bromides in water. J INCL PHENOM MACRO 2016. [DOI: 10.1007/s10847-016-0656-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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4
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Fernández-Rosas J, Pessêgo M, Cepeda-Plaza M, Basilio N, Parajó M, Rodríguez-Dafonte P, García-Río L. γ-Cyclodextrin modulates the chemical reactivity by multiple complexation. Org Biomol Chem 2015; 13:1213-24. [DOI: 10.1039/c4ob02113d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Multiple recognition by cooperative/competitive mechanisms to form a 1 : 1 : 1 inclusion complex plays a crucial role in determining the chemical reactivity in the γ-CD cavity.
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Affiliation(s)
- J. Fernández-Rosas
- Departamento de Química Física
- Centro de Investigación en Química Biológica y Materiales Moleculares (CIQUS)
- Universidad de Santiago
- 15782 Santiago
- Spain
| | - M. Pessêgo
- Departamento de Química Física
- Centro de Investigación en Química Biológica y Materiales Moleculares (CIQUS)
- Universidad de Santiago
- 15782 Santiago
- Spain
| | - M. Cepeda-Plaza
- Departamento de Química
- Universidad Andrés Bello
- Santiago
- Chile
| | - N. Basilio
- REQUIMTE
- Departamento de Química
- Faculdade de Ciências e Tecnologia
- Universidade Nova de Lisboa
- 2829-516 Caparica
| | - M. Parajó
- Departamento de Química Física
- Centro de Investigación en Química Biológica y Materiales Moleculares (CIQUS)
- Universidad de Santiago
- 15782 Santiago
- Spain
| | - P. Rodríguez-Dafonte
- Departamento de Química Física
- Centro de Investigación en Química Biológica y Materiales Moleculares (CIQUS)
- Universidad de Santiago
- 15782 Santiago
- Spain
| | - L. García-Río
- Departamento de Química Física
- Centro de Investigación en Química Biológica y Materiales Moleculares (CIQUS)
- Universidad de Santiago
- 15782 Santiago
- Spain
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5
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Valente AJM, Söderman O. The formation of host-guest complexes between surfactants and cyclodextrins. Adv Colloid Interface Sci 2014; 205:156-76. [PMID: 24011696 DOI: 10.1016/j.cis.2013.08.001] [Citation(s) in RCA: 133] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2013] [Revised: 08/01/2013] [Accepted: 08/01/2013] [Indexed: 11/15/2022]
Abstract
Cyclodextrins are able to act as host molecules in supramolecular chemistry with applications ranging from pharmaceutics to detergency. Among guest molecules surfactants play an important role with both fundamental and practical applications. The formation of cyclodextrin/surfactant host-guest compounds leads to an increase in the critical micelle concentration and in the solubility of surfactants. The possibility of changing the balance between several intermolecular forces, and thus allowing the study of, e.g., dehydration and steric hindrance effects upon association, makes surfactants ideal guest molecules for fundamental studies. Therefore, these systems allow for obtaining a deep insight into the host-guest association mechanism. In this paper, we review the influence on the thermodynamic properties of CD-surfactant association by highlighting the effect of different surfactant architectures (single tail, double-tailed, gemini and bolaform), with special emphasis on cationic surfactants. This is complemented with an assessment of the most common analytical techniques used to follow the association process. The applied methods for computation of the association stoichiometry and stability constants are also reviewed and discussed; this is an important point since there are significant discrepancies and scattered data for similar systems in the literature. In general, the surfactant-cyclodextrin association is treated without reference to the kinetics of the process. However, there are several examples where the kinetics of the process can be investigated, in particular those where volumes of the CD cavity and surfactant (either the tail or in special cases the head group) are similar in magnitude. This will also be critically reviewed.
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Affiliation(s)
- Artur J M Valente
- Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Olle Söderman
- Division of Physical Chemistry, Center for Chemistry and Chemical Engineering, Lund University, Lund, Sweden
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6
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Cepeda M, Daviña R, García-Río L, Parajó M, Rodríguez-Dafonte P, Pessêgo M. Competition between surfactant micellization and complexation by cyclodextrin. Org Biomol Chem 2013; 11:1093-102. [DOI: 10.1039/c2ob26318a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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7
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Brocos P, Banquy X, Díaz-Vergara N, Pérez-Casas S, Piñeiro Á, Costas M. A Critical Approach to the Thermodynamic Characterization of Inclusion Complexes: Multiple-Temperature Isothermal Titration Calorimetric Studies of Native Cyclodextrins with Sodium Dodecyl Sulfate. J Phys Chem B 2011; 115:14381-96. [DOI: 10.1021/jp208740b] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pilar Brocos
- Departamento de Física Aplicada, Facultad de Física, Universidad de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain
| | - Xavier Banquy
- Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
| | - Norma Díaz-Vergara
- Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
| | - Silvia Pérez-Casas
- Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
| | - Ángel Piñeiro
- Departamento de Física Aplicada, Facultad de Física, Universidad de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain
- Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
| | - Miguel Costas
- Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
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8
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Jiang L, Yan Y, Huang J. Versatility of cyclodextrins in self-assembly systems of amphiphiles. Adv Colloid Interface Sci 2011; 169:13-25. [PMID: 21839422 DOI: 10.1016/j.cis.2011.07.002] [Citation(s) in RCA: 130] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2011] [Revised: 07/14/2011] [Accepted: 07/16/2011] [Indexed: 11/25/2022]
Abstract
Recently, cyclodextrins (CDs) were found to play important yet complicated (or even apparently opposite sometimes) roles in self-assembly systems of amphiphiles or surfactants. Herein, we try to review and clarify the versatility of CDs in surfactant assembly systems by 1) classifying the roles played by CDs into two groups (modulator and building unit) and four subgroups (destructive and constructive modulators, amphiphilic and unamphiphilic building units), 2) comparing these subgroups, and 3) analyzing mechanisms. As a modulator, although CDs by themselves do not participate into the final surfactant aggregates, they can greatly affect the aggregates in two ways. In most cases CDs will destroy the aggregates by depleting surfactant molecules from the aggregates (destructive), or in certain cases CDs can promote the aggregates to grow by selectively removing the less-aggregatable surfactant molecules from the aggregates (constructive). As an amphiphilic building unit, CDs can be chemically (by chemical bonds) or physically (by host-guest interaction) attached to a hydrophobic moiety, and the resultant compounds act as classic amphiphiles. As an unamphiphilic building unit, CD/surfactant complexes or even CDs on their own can assemble into aggregates in an unconventional, unamphiphilic manner driven by CD-CD H-bonds. Moreover, special emphasis is put on two recently appeared aspects: the constructive modulator and unamphiphilic building unit.
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9
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Brocos P, Díaz-Vergara N, Banquy X, Pérez-Casas S, Costas M, Piñeiro Á. Similarities and Differences Between Cyclodextrin−Sodium Dodecyl Sulfate Host−Guest Complexes of Different Stoichiometries: Molecular Dynamics Simulations at Several Temperatures. J Phys Chem B 2010; 114:12455-67. [DOI: 10.1021/jp103223u] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pilar Brocos
- Departamento de Física Aplicada, Facultad de Física, Universidad de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain, and Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
| | - Norma Díaz-Vergara
- Departamento de Física Aplicada, Facultad de Física, Universidad de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain, and Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
| | - Xavier Banquy
- Departamento de Física Aplicada, Facultad de Física, Universidad de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain, and Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
| | - Silvia Pérez-Casas
- Departamento de Física Aplicada, Facultad de Física, Universidad de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain, and Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
| | - Miguel Costas
- Departamento de Física Aplicada, Facultad de Física, Universidad de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain, and Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
| | - Ángel Piñeiro
- Departamento de Física Aplicada, Facultad de Física, Universidad de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain, and Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
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Astray G, Cid A, García-Río L, Lodeiro C, Mejuto J, Moldes O, Morales J. Cyclodextrin-Surfactant Mixed Systems as Reaction Media. PROGRESS IN REACTION KINETICS AND MECHANISM 2010. [DOI: 10.3184/146867810x12686717520194] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In recent years our reseach group has investigated the chemical behaviour of β-cyclodextrin (CD)/surfactant mixed systems and their characteristics as reaction media. The results have been interpreted in terms of a pseudophase model that takes into account the formation of both CD-surfactant and CD-substrate complexes and also, in some cases, the exchange of X- and OH- ions between the micellar and aqueous pseudophases. from the experimental results it was concluded that the presence of CD has no effect on existing micelles but raises the critical micellar concentration (cmc). on the other hand, at surfactant concentrations above the cmc, competition between the micellisation and complexation processes leads to the existence of a significant concentration of free CD in equilibrium with the micellar aggregates. The percentage of uncomplexed β-CD in equilibrium with the micellar system increases on increasing the hydrophobicity of the surfactant molecule. This behaviour was justified taking into account the existence of two simultaneous processes: complexation of surfactant monomers by CD and the process of self-assembly to form micellar aggregates. The autoaggregation of surfactant monomers is 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 CD in equilibrium with the micellar system were in the range of 5-95%. When the surfactant self-assembly structure is a vesicle, the free CD in the CD/surfactant mixed system yields a percentage of 100%.
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Affiliation(s)
- G. Astray
- Department of Physical Chemistry, Faculty of Science, University of Vigo at Ourense, Ourense, Spain
| | - A. Cid
- Department of Physical Chemistry, Faculty of Science, University of Vigo at Ourense, Ourense, Spain
| | - L. García-Río
- Department of Physical Chemistry, Faculty of Chemistry, Univeristy of Santiago, Santiago de Compostela, Spain
| | - C. Lodeiro
- Department of Physical Chemistry, Faculty of Science, University of Vigo at Ourense, Ourense, Spain
| | - J.C. Mejuto
- Department of Physical Chemistry, Faculty of Science, University of Vigo at Ourense, Ourense, Spain
| | - O. Moldes
- Department of Physical Chemistry, Faculty of Science, University of Vigo at Ourense, Ourense, Spain
| | - J. Morales
- Department of Physical Chemistry, Faculty of Science, University of Vigo at Ourense, Ourense, Spain
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Cabaleiro-Lago C, García-Río L, Hervés P, Pérez-Juste J. Fully Uncomplexed Cyclodextrin in Mixed Systems of Vesicle−Cyclodextrin: Solvolysis of Benzoyl Chlorides. J Phys Chem B 2009; 113:6749-55. [DOI: 10.1021/jp901028k] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- C. Cabaleiro-Lago
- Department of Physical Chemistry, Faculty of Chemistry, University of Vigo, 36310 Vigo, Spain, and Department of Physical Chemistry, Faculty of Chemistry, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - L. García-Río
- Department of Physical Chemistry, Faculty of Chemistry, University of Vigo, 36310 Vigo, Spain, and Department of Physical Chemistry, Faculty of Chemistry, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - P. Hervés
- Department of Physical Chemistry, Faculty of Chemistry, University of Vigo, 36310 Vigo, Spain, and Department of Physical Chemistry, Faculty of Chemistry, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - J. Pérez-Juste
- Department of Physical Chemistry, Faculty of Chemistry, University of Vigo, 36310 Vigo, Spain, and Department of Physical Chemistry, Faculty of Chemistry, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain
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12
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Mileo E, Franchi P, Gotti R, Bendazzoli C, Mezzina E, Lucarini M. An EPR method for measuring the rate of distribution of organic substrates between cyclodextrin, micelles and water. Chem Commun (Camb) 2008:1311-3. [DOI: 10.1039/b718049g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Arias-Estevez M, Astray G, Cid A, Fernández-Gándara D, García-Río L, Mejuto JC. Influence of colloid suspensions of humic acids upon the alkaline fading of carbocations. J PHYS ORG CHEM 2008. [DOI: 10.1002/poc.1317] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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14
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García-Río L, Méndez M, Paleo MR, Sardina FJ. New Insights in Cyclodextrin: Surfactant Mixed Systems from the Use of Neutral and Anionic Cyclodextrin Derivatives. J Phys Chem B 2007; 111:12756-64. [DOI: 10.1021/jp073510p] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- L. García-Río
- Departamento de Química Física and Departamento de Química Orgánica, Facultad de Química, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - M. Méndez
- Departamento de Química Física and Departamento de Química Orgánica, Facultad de Química, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - M. R. Paleo
- Departamento de Química Física and Departamento de Química Orgánica, Facultad de Química, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - F. J. Sardina
- Departamento de Química Física and Departamento de Química Orgánica, Facultad de Química, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
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15
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Matsumoto T, Liu Y, Sueishi Y, Yamamoto S. Effects of Ionic Surfactants and Cyclodextrins on Hydride-Transfer Reaction of 1-Benzyl-1,4-dihydronicotinamide with Methylene Blue. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2007. [DOI: 10.1246/bcsj.80.1383] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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16
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García-Río L, Mejuto J, Nieto M, Pérez-Juste J, Pérez-Lorenzo M, Rodríguez-Dafonte P. Denitrosation of N-Nitrososulfonamide as Chemical Probe for Determination of Binding Constants to Cyclodextrins. Supramol Chem 2007. [DOI: 10.1080/10610270500231824] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- L. García-Río
- a University of Santiago, Department of Physical Chemistry, Faculty of Chemistry , Spain
| | - J.C. Mejuto
- b University of Vigo at Ourense, Department of Physical Chemistry, Faculty of Science , Spain
| | - M. Nieto
- b University of Vigo at Ourense, Department of Physical Chemistry, Faculty of Science , Spain
| | - J. Pérez-Juste
- b University of Vigo at Ourense, Department of Physical Chemistry, Faculty of Science , Spain
| | - M. Pérez-Lorenzo
- a University of Santiago, Department of Physical Chemistry, Faculty of Chemistry , Spain
| | - P. Rodríguez-Dafonte
- a University of Santiago, Department of Physical Chemistry, Faculty of Chemistry , Spain
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17
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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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18
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Cabaleiro-Lago C, García-Río L, Hervés P, Mejuto JC, Pérez-Juste J. Characterization of Alkane Diol-CD Complexes. Acid Denitrosation of N-Methyl-N-Nitroso-p-Toluenesulphonamide as a Chemical Probe. J INCL PHENOM MACRO 2006. [DOI: 10.1007/s10847-005-7379-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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19
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Arias M, García-Río L, Mejuto JC, Rodríguez-Dafonte P, Simal-Gándara J. Influence of micelles on the basic degradation of carbofuran. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2005; 53:7172-8. [PMID: 16131126 DOI: 10.1021/jf0505574] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The effect of micellar aggregates upon the stability of carbofuran in basic media has been studied. The effect of the presence of micelles upon the basic hydrolysis of carbofuran is a function of the nature of the surfactant monomer. Important catalysis of basic hydrolysis of carbofuran in the presence of colloid aggregates with positive surface charge has been reported. On the other hand, the presence of anionic and nonionic surfactants implies a large inhibition of the basic hydrolysis of carbofuran. Both catalysis and inhibition are due to the association of carbofuran with the micellar core. The kinetic constants for the basic hydrolysis of carbofuran in these microheterogeneous media have been obtained on the basis of a micellar pseudophase model. No significant changes in the intrinsic reactivity of HO- against carbofuran have been observed.
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Affiliation(s)
- Manuel Arias
- Area de Edafología y Química Agrícola, Facultad de Ciencias de Ourense, Universidad de Vigo, Ourense, Spain
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20
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Lima S, Goodfellow BJ, Teixeira-Dias JJC. How Inorganic Anions Affect the Inclusion of Hexanoic and Decanoic Acid in β-Cyclodextrin. J Phys Chem A 2004. [DOI: 10.1021/jp046882w] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sérgio Lima
- Department of Chemistry, University of Aveiro, CICECO, P3810-193 Aveiro, Portugal
| | - Brian J. Goodfellow
- Department of Chemistry, University of Aveiro, CICECO, P3810-193 Aveiro, Portugal
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21
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García-Río L, Leis JR, Mejuto JC, Navarro-Vázquez A, Pérez-Juste J, Rodriguez-Dafonte P. Basic hydrolysis of crystal violet in beta-cyclodextrin/surfactant mixed systems. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:606-13. [PMID: 15773082 DOI: 10.1021/la035477d] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The basic hydrolysis of crystal violet (CV) in mixed systems consisting of beta-cyclodextrin (beta-CD) and a micelle-forming surfactant, cetyltrimethylammonium chloride (CTACl), has been studied. beta-CD was found to catalyze the basic hydrolysis of CV through the interaction of its hydroxyl group, in its deprotonated form, with the carbocation in the complexed substrate. The addition of small amounts of CTACl, with [CTACl] below the critical micelle concentration, to beta-CD solutions does not have an effect upon the observed rate constant for the basic hydrolysis of CV. This behavior is different from that observed for the alkaline hydrolysis of N-methyl-N-nitroso-p-toluenesulfonamide and nitrophenyl acetates in mixed beta-CD/cationic surfactant systems. The proposed mechanism allows us to explain the experimental results on the basis of the high percentage of uncomplexed beta-CD in equilibrium with the micellar system, the low CV concentration, and the high value for the binding constant of CV by beta-CD.
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Affiliation(s)
- L García-Río
- Departamento de Química Física, Facultad de Químicia, Universidad de Santiago de Compostela, Santiago de Compostela, Spain
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22
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Lima S, Goodfellow BJ, Teixeira-Dias JJC. How Alkali-Metal Cations Affect the Inclusion of Decanoic Acid in β-Cyclodextrin. J Phys Chem B 2003. [DOI: 10.1021/jp0351674] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sérgio Lima
- Department of Chemistry, University of Aveiro, CICECO, P3810−193 Aveiro, Portugal
| | - Brian J. Goodfellow
- Department of Chemistry, University of Aveiro, CICECO, P3810−193 Aveiro, Portugal
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23
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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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24
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Dorrego A, García-Río L, Hervés P, Leis J, Mejuto J, Pérez-Juste J. Micellbildung oder Bildung eines Cyclodextrin-Tensid-Komplexes. Angew Chem Int Ed Engl 2000. [DOI: 10.1002/1521-3757(20000818)112:16<3060::aid-ange3060>3.0.co;2-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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25
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Dorrego AB, García-Río L, Hervés P, Leis JR, Mejuto JC, Pérez-Juste J. Micellization versus Cyclodextrin-Surfactant Complexation Financial support from the Dirección General de Enseñanza Superior of Spain (project PB96-0954) and Xunta de Galicia (project PGIDT99 PXI30104B) is gratefully acknowledged. J. P.-J. wishes to thank the Ministerio de Educación y Cultura for a F.P.U. fellowship. Angew Chem Int Ed Engl 2000; 39:2945-2948. [PMID: 11028019 DOI: 10.1002/1521-3773(20000818)39:16<2945::aid-anie2945>3.0.co;2-6] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- AB Dorrego
- Departamento de Química Física, Facultad de Química Universidad de Santiago 15706 Santiago (Spain)
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26
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Fern�ndez I, Garc�a-R�o L, Herv�s P, Mejuto JC, P�rez-Juste J, Rodr�guez-Dafonte P. ?-Cyclodextrin-micelle mixed systems as a reaction �medium. Denitrosation ofN-methyl-N-nitroso-p-toluenesulfonamide. J PHYS ORG CHEM 2000. [DOI: 10.1002/1099-1395(200010)13:10<664::aid-poc264>3.0.co;2-u] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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