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Dib N, Falcone RD, Acuña A, García-Río L. Ionic liquid-based reverse micelles. Use of hydrogen–deuterium exchange as a tool for surfactant self-assembly characterization. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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2
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M. O. Lépori C, Soledad Orellano M, Mariano Correa N, Silber JJ, Darío Falcone R. Understanding the interfacial properties of bmim-AOT reverse micelles for their application as nanoreactors. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Dib N, Silber JJ, Correa NM, Falcone RD. Amphiphilic Ionic Liquids Capable to Formulate Organized Systems in an Aqueous Solution, Designed by a Combination of Traditional Surfactants and Commercial Drugs. Pharm Res 2022; 39:2379-2390. [PMID: 35854078 DOI: 10.1007/s11095-022-03342-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 07/11/2022] [Indexed: 10/17/2022]
Abstract
The present review describes the state of the art in the conversion of pharmaceutically active ingredients (API) in amphiphilic Ionic Liquids (ILs) as alternative drug delivery systems. In particular, we focus our attention on the compounds generated by ionic exchange and without original counterions which generate different systems in comparison with the simple mixtures. In water, these new amphiphiles show similar or even better properties as surfactants in comparison with their precursors. Cations such as 1-alkyl-3-methyl-imidazolium and anions such as dioctyl sulfosuccinate or sodium dodecyl sulfate appear as the amphiphilic components most studied. In conclusion, this work shows interesting information on several promissory compounds and they appear as an interesting challenge to extend the application of ILs in the medical field.
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Affiliation(s)
- Nahir Dib
- Departamento de Química, Universidad Nacional de Rio Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Rio Cuarto, Córdoba, Argentina
- Instituto de Desarrollo Agroindustrial y de la Salud (IDAS), Universidad Nacional de Río Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Río Cuarto, Córdoba, Argentina
| | - Juana J Silber
- Departamento de Química, Universidad Nacional de Rio Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Rio Cuarto, Córdoba, Argentina
- Instituto de Desarrollo Agroindustrial y de la Salud (IDAS), Universidad Nacional de Río Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Río Cuarto, Córdoba, Argentina
| | - N Mariano Correa
- Departamento de Química, Universidad Nacional de Rio Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Rio Cuarto, Córdoba, Argentina
- Instituto de Desarrollo Agroindustrial y de la Salud (IDAS), Universidad Nacional de Río Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Río Cuarto, Córdoba, Argentina
| | - R Dario Falcone
- Departamento de Química, Universidad Nacional de Rio Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Rio Cuarto, Córdoba, Argentina.
- Instituto de Desarrollo Agroindustrial y de la Salud (IDAS), Universidad Nacional de Río Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Río Cuarto, Córdoba, Argentina.
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Bergamasco L, Morciano M, Fasano M. Effect of water nanoconfinement on the dynamic properties of paramagnetic colloidal complexes. Phys Chem Chem Phys 2021; 23:16948-16957. [PMID: 34338258 DOI: 10.1039/d1cp00708d] [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
The anomalous behavior of confined water at the nanoscale has remarkable implications in a number of nanotechnological applications. In this work, we analyze the effect of water self-diffusion on the dynamic properties of a solvated gadolinium-based paramagnetic complex, typically used for contrast enhancement in magnetic resonance imaging. In particular, we examine the effect of silica-based nanostructures on water behavior in the proximity of the paramagnetic complex via atomistic simulations, and interpret the resulting tumbling dynamics in the light of the local solvent modification based on the Lipari-Szabo formalism and of the fractional Stokes-Einstein relation. It is found that the local water confinement induces an increased "stiffness" on the outer sphere of the paramagnetic complex, which eventually reduces its tumbling properties. These model predictions are found to explain well the relaxivity enhancement observed experimentally by confining paramagnetic complexes into porous nanoconstructs, and thus offer mechanistic guidelines to design improved contrast agents for imaging applications.
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Affiliation(s)
- Luca Bergamasco
- Department of Energy, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy.
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Biocompatible Solvents and Ionic Liquid-Based Surfactants as Sustainable Components to Formulate Environmentally Friendly Organized Systems. Polymers (Basel) 2021; 13:polym13091378. [PMID: 33922597 PMCID: PMC8122929 DOI: 10.3390/polym13091378] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 04/16/2021] [Accepted: 04/19/2021] [Indexed: 01/03/2023] Open
Abstract
In this review, we deal with the formation and application of biocompatible water-in-oil microemulsions commonly known as reverse micelles (RMs). These RMs are extremely important to facilitate the dissolution of hydrophilic and hydrophobic compounds for biocompatibility in applications in drug delivery, food science, and nanomedicine. The combination of two wisely chosen types of compounds such as biocompatible non-polar solvents and ionic liquids (ILs) with amphiphilic character (surface-active ionic liquids, SAILs) can be used to generate organized systems that perfectly align with the Green Chemistry concepts. Thus, we describe the current state of SAILs (protic and aprotic) to prepare RMs using non-polar but safe solvents such as esters derived from fatty acids, among others. Moreover, the use of the biocompatible solvents as the external phase in RMs and microemulsions/nanoemulsions with the other commonly used biocompatible surfactants is detailed showing the diversity of preparations and important applications. As shown by multiple examples, the properties of the RMs can be modified by changes in the type of surfactant and/or external solvents but a key fact to note is that all these modifications generate novel systems with dissimilar properties. These interesting properties cannot be anticipated or extrapolated, and deep analysis is always required. Finally, the works presented provide valuable information about the use of biocompatible RMs, making them a green and promising alternative toward efficient and sustainable chemistry.
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Dib N, Falcone RD, García-Río L. Hydrolysis Reactions of Two Benzoyl Chlorides as a Probe to Investigate Reverse Micelles Formed by the Ionic Liquid-Surfactant bmim-AOT. J Org Chem 2020; 85:15006-15014. [PMID: 33147953 DOI: 10.1021/acs.joc.0c01740] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this work, two hydrolysis reactions were used as a probe to investigate the properties of reverse micelles (RMs) formed by the ionic liquid-surfactant 1-butyl-3-methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate (bmim-AOT). The results were compared with those found for RMs generated with sodium 1,4-bis-2-ethylhexylsulfosuccinate (Na-AOT). As external nonpolar solvents, n-heptane (n-Hp), isopropyl myristate (IPM), and methyl laurate (ML) were used. Thus, the effect of changing the Na+ cation by bmim+ was analyzed, as well as the impact of the replacement of a conventional external nonpolar solvent by biocompatible solvents. The kinetics of the hydrolysis reactions of 4-methoxybenzoyl chloride (OMe) and 4-(trifluoromethyl)benzoyl chloride (CF3) were studied. The results indicate that the replacement of the Na+ counterion by bmim+ in AOT RMs alters the rates of reactions carried out in them and produces changes in the reaction mechanism. In bmim-AOT RMs, the bmim+ cation is located between the surfactant molecules; this has an important influence on the reaction intermediates' stability and, therefore, in the reaction rates and mechanisms. Also, the results indicate that when IPM is used as an external solvent instead of ML or n-Hp, interfacial water molecules have larger nucleophilicity due to the higher interface penetration of IPM.
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Affiliation(s)
- Nahir Dib
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS), CONICET, Departamento de Quı́mica, Universidad Nacional de Rı́o Cuarto, Agencia Postal # 3, C.P. X5804BYA Rı́o Cuarto, Argentina
| | - R Dario Falcone
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS), CONICET, Departamento de Quı́mica, Universidad Nacional de Rı́o Cuarto, Agencia Postal # 3, C.P. X5804BYA Rı́o Cuarto, Argentina
| | - Luis García-Río
- Centro Singular de Investigación en Quı́mica Biolóxica e Materiais Moleculares (CIQUS) and Departamento de Quı́mica Fı́sica, Universidade de Santiago de Compostela, 15782 Santiago, Spain
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The confinement of PVP in AOT microemulsions: Effect of water content and PVP concentration regime on electrical percolation phenomenon. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.114012] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Lépori CMO, Correa NM, Silber JJ, Falcone RD, López-López M, Moyá ML. Influence of the AOT Counterion Chemical Structure on the Generation of Organized Systems. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:10785-10793. [PMID: 32830497 DOI: 10.1021/acs.langmuir.0c01575] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The impact of the imidazolium counterion structure on the organized systems formed by the surfactant 1,4-bis-2-ethylhexylsulfosuccinate, AOT, both in aqueous solutions and in nonpolar solvents is investigated. With this in mind, we investigated if the ionic liquid-like (IL-like) surfactant 1-ethyl-3-methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate, emim-AOT, forms direct micelles or vesicles in water. Dynamic light scattering, zeta potential, conductivity, fluorescence spectroscopy, and UV-visible spectroscopy measurements were performed to characterize the organized systems in aqueous solutions. We also studied the self-aggregation of emim-AOT, 1-butyl-3-methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate, bmim-AOT, and of 1-hexyl-3-methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate, hmim-AOT, in nonpolar solvents. The results obtained showed that the IL-like surfactant emim-AOT forms direct micelles in water, as sodium 1,4-bis-2-ethylhexylsulfosuccinate (Na-AOT) does. However, emim-AOT aggregates are larger, have a lower surface charge, are more stable, and have a more polar and less fluid micellar interface than Na-AOT micelles. It was also observed that emim-AOT and hmim-AOT form reverse micelles in nonpolar solvents. The size of the imidazolium cations dramatically influences the size of the reverse micelles and their ability to solubilize water.
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Affiliation(s)
- Cristian M O Lépori
- Instituto de Física Enrique Gaviola (IFEG), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Córdoba (UNC), Medina Allende s/n, Ciudad Universitaria, X5016LAE Córdoba, Argentina
| | - N Mariano Correa
- Departamento de Química, Universidad Nacional de Río Cuarto (UNRC), Agencia Postal # 3, X5804BYA Río Cuarto, Argentina
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS), CONICET-UNRC, Agencia Postal # 3, X5804BYA Río Cuarto, Argentina
| | - Juana J Silber
- Departamento de Química, Universidad Nacional de Río Cuarto (UNRC), Agencia Postal # 3, X5804BYA Río Cuarto, Argentina
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS), CONICET-UNRC, Agencia Postal # 3, X5804BYA Río Cuarto, Argentina
| | - R Darío Falcone
- Departamento de Química, Universidad Nacional de Río Cuarto (UNRC), Agencia Postal # 3, X5804BYA Río Cuarto, Argentina
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS), CONICET-UNRC, Agencia Postal # 3, X5804BYA Río Cuarto, Argentina
| | - Manuel López-López
- Departamento de Ingeniería Química, Química Física y Ciencias de Materiales, Centro de Ciencia y Tecnología, Facultad de Ciencias Experimentales, Universidad de Huelva, Campus "El Carmen", E-21071 Huelva, Spain
| | - M Luisa Moyá
- Departamento de Química Física, Universidad de Sevilla, c/Prof. García González 1, 41012 Sevilla, Spain
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Dib N, Silber JJ, Correa NM, Falcone RD. Imim-DEHP reverse micelles investigated with two molecular probes reveals how are the interfacial properties and the coordination behavior of the surfactant. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113592] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Dib N, Falcone RD, Acuña A, García-Río L. The ionic liquid-surfactant bmim-AOT and nontoxic lipophilic solvents as components of reverse micelles alternative to the traditional systems. A study by 1H NMR spectroscopy. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112762] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Development of Topical/Transdermal Self-Emulsifying Drug Delivery Systems, Not as Simple as Expected. Sci Pharm 2020. [DOI: 10.3390/scipharm88020017] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Self-emulsifying drug delivery systems (SEDDSs) originated as an oral lipid-based drug delivery system with the sole purpose of improving delivery of highly lipophilic drugs. However, the revolutionary drug delivery possibilities presented by these uniquely simplified systems in terms of muco-adhesiveness and zeta-potential changing capacity lead the way forward to ground-breaking research. Contrarily, SEDDSs destined for topical/transdermal drug delivery have received limited attention. Therefore, this review is focused at utilising principles, established during development of oral SEDDSs, and tailoring them to fit evaluation strategies for an optimised topical/transdermal drug delivery vehicle. This includes a detailed discussion of how the authentic pseudo-ternary phase diagram is employed to predict phase behaviour to find the self-emulsification region most suitable for formulating topical/transdermal SEDDSs. Additionally, special attention is given to the manner of characterising oral SEDDSs compared to topical/transdermal SEDDSs, since absorption within the gastrointestinal tract and the multi-layered nature of the skin are two completely diverse drug delivery territories. Despite the advantages of the topical/transdermal drug administration route, certain challenges such as the relatively undiscovered field of skin metabolomics as well as the obstacles of choosing excipients wisely to establish skin penetration enhancement might prevail. Therefore, development of topical/transdermal SEDDSs might be more complicated than expected.
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12
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Cobo Solís AK, Luna MA, Falcone RD, Correa NM, Molina PG. Electrochemical Methodology as an Useful Tool for the Interfacial Characterization of Aqueous Reverse Micelles. ChemistrySelect 2019. [DOI: 10.1002/slct.201903904] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Airam K. Cobo Solís
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS)UNRC-CONICET, Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
- Departamento de QuímicaUniversidad Nacional de Río CuartoFacultad de Ciencias Exactas, Físico-Químicas y Naturales, Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
| | - M. Alejandra Luna
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS)UNRC-CONICET, Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
- Departamento de QuímicaUniversidad Nacional de Río CuartoFacultad de Ciencias Exactas, Físico-Químicas y Naturales, Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
| | - R. Darío Falcone
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS)UNRC-CONICET, Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
- Departamento de QuímicaUniversidad Nacional de Río CuartoFacultad de Ciencias Exactas, Físico-Químicas y Naturales, Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
| | - N. Mariano Correa
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS)UNRC-CONICET, Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
- Departamento de QuímicaUniversidad Nacional de Río CuartoFacultad de Ciencias Exactas, Físico-Químicas y Naturales, Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
| | - Patricia G. Molina
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS)UNRC-CONICET, Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
- Departamento de QuímicaUniversidad Nacional de Río CuartoFacultad de Ciencias Exactas, Físico-Químicas y Naturales, Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
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Monti GA, Correa NM, Falcone RD, Silbestri GF, Moyano F. Gold Nanoparticles Stabilized by Sulfonated‐Imidazolium Salts as Promising Catalyst in Water. ChemistrySelect 2019. [DOI: 10.1002/slct.201903396] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Gustavo A. Monti
- Instituto para el desarrollo agroindustrial y de la salud, IDAS(CONICET – UNRC.) Departamento de Química. Universidad Nacional de Río Cuarto. Agencia Postal # 3. C.P. X5804BYA Río Cuarto Argentina
| | - N. Mariano Correa
- Instituto para el desarrollo agroindustrial y de la salud, IDAS(CONICET – UNRC.) Departamento de Química. Universidad Nacional de Río Cuarto. Agencia Postal # 3. C.P. X5804BYA Río Cuarto Argentina
| | - R. Darío Falcone
- Instituto para el desarrollo agroindustrial y de la salud, IDAS(CONICET – UNRC.) Departamento de Química. Universidad Nacional de Río Cuarto. Agencia Postal # 3. C.P. X5804BYA Río Cuarto Argentina
| | - Gustavo F. Silbestri
- Instituto de Química del Sur (INQUISUR)Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET Av. Alem 1253 B8000CPB Bahía Blanca Argentina
| | - Fernando Moyano
- Instituto para el desarrollo agroindustrial y de la salud, IDAS(CONICET – UNRC.) Departamento de Química. Universidad Nacional de Río Cuarto. Agencia Postal # 3. C.P. X5804BYA Río Cuarto Argentina
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Lépori CMO, Correa NM, Silber JJ, Falcone RD, López-López M, Moyá ML. Use of Ionic Liquids-like Surfactants for the Generation of Unilamellar Vesicles with Potential Applications in Biomedicine. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:13332-13339. [PMID: 31510743 DOI: 10.1021/acs.langmuir.9b01197] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The goal of this work is to understand the influence of the counterion nature on the organized systems formed by 1,4-bis-2-ethylhexylsulfosuccinate surfactants in aqueous solutions and how these aggregates will influence the deoxyribonucleic acid (DNA)-surfactant interactions. With this in mind, two ionic liquid-like surfactants were investigated: 1-butyl-3-methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate (bmim-AOT) and 1-hexyl-3-methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate (hmim-AOT). Measurements of dynamic light scattering, ζ-potential, transmission electron microscopy, and fluorescence and UV-visible spectroscopy were performed to study the characteristics of the vesicles formed by bmim-AOT and hmim-AOT. Regarding the determination of the interaction of the surfactants with DNA, circular dichroism was used. The results obtained showed that bmim-AOT and hmim-AOT ionic liquid-like surfactants spontaneously form unilamellar vesicles in water at very low surfactant concentrations. The characteristics of these aggregates are dependent on the length of the tail of the counterions. The length of the hydrophobic chains of the counterions also influences the DNA-surfactant interactions through hydrophobic effects.
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Affiliation(s)
- Cristian M O Lépori
- Instituto de Física Enrique Gaviola (IFEG) , Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)-Universidad Nacional de Córdoba (UNC), Medina Allende s/n , Ciudad Universitaria , X5016LAE Córdoba , Argentina
| | - N Mariano Correa
- Departamento de Química , Universidad Nacional de Río Cuarto (UNRC) , Agencia Postal # 3 , X5804BYA Río Cuarto , Argentina
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS) , CONICET-UNRC , Agencia Postal # 3 , X5804BYA Río Cuarto , Argentina
| | - Juana J Silber
- Departamento de Química , Universidad Nacional de Río Cuarto (UNRC) , Agencia Postal # 3 , X5804BYA Río Cuarto , Argentina
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS) , CONICET-UNRC , Agencia Postal # 3 , X5804BYA Río Cuarto , Argentina
| | - R Darío Falcone
- Departamento de Química , Universidad Nacional de Río Cuarto (UNRC) , Agencia Postal # 3 , X5804BYA Río Cuarto , Argentina
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS) , CONICET-UNRC , Agencia Postal # 3 , X5804BYA Río Cuarto , Argentina
| | - Manuel López-López
- Departamento de Ingeniería Química, Química Física y Ciencias de Materiales, Centro de Ciencia y Tecnología , Universidad de Huelva , Campus 'El Carmen', Facultad de Ciencias Experimentales , E-21071 Huelva , Spain
| | - M Luisa Moyá
- Departamento de Química Física , Universidad de Sevilla , c/Prof. García González 1 , 41012 Sevilla , Spain
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15
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Dib N, Falcone RD, Acuña A, García-Río L. Characterization of Reverse Micelles Formulated with the Ionic-Liquid-like Surfactant Bmim-AOT and Comparison with the Traditional Na-AOT: Dynamic Light Scattering, 1H NMR Spectroscopy, and Hydrolysis Reaction of Carbonate as a Probe. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:12744-12753. [PMID: 31495176 DOI: 10.1021/acs.langmuir.9b01083] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The present study investigated how the presence of butylmethylimidazolium cation (bmim+) alters the interfacial properties of reverse micelles (RMs) created with the ionic liquid-like surfactant 1-butyl-3-methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate (bmim-AOT), in comparison to sodium 1,4-bis-2-ethylhexylsulfosuccinate (Na-AOT) RMs, employing dynamic light scattering (DLS) and 1H NMR techniques. Moreover, through the hydrolysis reaction of bis(4-nitrophenyl)carbonate inside both RMs as reaction probe, interfacial properties changes were explored in more detail. The kinetic solvent isotope effect was also analyzed. Micellar systems were formed using n-heptane as external nonpolar solvent and water as the polar component. According to the DLS studies, water is encapsulated inside the organized media; however, a different tendency is observed depending on the cationic component of the surfactant. For Na-AOT system, the results suggest that the micellar shapes are probably spherical, while in the case of bmim-AOT, a transition from ellipsoidal to spherical micelles could be occurring when water is added. 1H NMR data show that water is structured differently when Na+ cation is replaced by bmim+; in bmim-AOT RMs, the interaction of water with the surfactant is weaker and the water hydrogen-bonding network is less disturbed than in Na-AOT RMs. Kinetic studies reveal that the hydrolysis reaction in bmim-AOT RMs was much more favorable in comparison to Na-AOT RMs. In addition, when water content decreases in bmim-AOT RMs, the hydrolysis reaction rate increases and the solvent isotope effect remains constant, while for Na-AOT solutions, both the reaction rate and the solvent isotope effect decrease. Our results indicate that bmim+ cation would be located in the surfactant layer in such a way the negative charge density in the interface is less than that in Na-AOT RMs, and the reaction is more favorable. Additionally, as 1H NMR studies reveal, the interfacial water molecules would be more available in bmim-AOT RMs to participate in the nucleophilic attack. Therefore, the present study evidences how the replacement of Na+ counterion by bmim+ alters the composition of the interface of AOT RMs.
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Affiliation(s)
- Nahir Dib
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS), CONICET-UNRC, Departamento de Química , Universidad Nacional de Río Cuarto , Agencia Postal # 3, CP X5804BYA Río Cuarto , Argentina
| | - R Dario Falcone
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS), CONICET-UNRC, Departamento de Química , Universidad Nacional de Río Cuarto , Agencia Postal # 3, CP X5804BYA Río Cuarto , Argentina
| | - Angel Acuña
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and 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) and Departamento de Química Física , Universidade de Santiago de Compostela , 15782 Santiago , Spain
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