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Scigliani A, Grant SC, Mohammadigoushki H. Probing self-assembled micellar topologies via micro-scale diffusive dynamics of surfactants. J Colloid Interface Sci 2023; 642:565-573. [PMID: 37028163 DOI: 10.1016/j.jcis.2023.03.102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 03/06/2023] [Accepted: 03/16/2023] [Indexed: 04/09/2023]
Abstract
HYPOTHESIS Surfactants spontaneously self-assemble in aqueous solutions and are critical in energy, biotechnology, and the environment. The self-assembled micelles may experience distinct topological transitions beyond a critical counter-ion concentration, yet the associated mechanical signatures are identical. By monitoring self-diffusion dynamics of individual surfactants in micelles via a non-invasive 1H NMR diffusometry, we may distinguish various topological transitions overcoming challenges associated with traditional microstructural probing techniques. EXPERIMENTS Three micellar systems based on CTAB/5mS, OTAB/NaOA and CPCl/NaClO3 are considered at various counter-ion concentrations, and their rheological properties are assessed. A systematic 1H NMR diffusometry is conducted and the resulting signal attenuation is measured. FINDINGS With no counter-ion, surfactants self-diffuse freely with a mean squared displacement Z2∼Tdiff in the micelles. As counter-ion concentration increases, self-diffusion becomes restricted with Z2∼Tdiffα, and α→0.5. Beyond the viscosity peak, for the OTAB/NaOA system that shows a linear-shorter linear micelle transition, Z2∼Tdiff0.5. Conversely, for the CTAB/5mS system that experiences a linear wormlike-vesicle transition above the viscosity peak, a free self-diffusion is recovered. The diffusion dynamics in CPCl/NaClO3 are similar to those of OTAB/NaOA. Hence, a similar topological transition is surmised. These results highlight the unique sensitivity of the 1H NMR diffusometry to micelles topological transitions.
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Affiliation(s)
- Alfredo Scigliani
- Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Tallahassee, FL 32310, USA; Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA
| | - Samuel C Grant
- Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Tallahassee, FL 32310, USA; Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA.
| | - Hadi Mohammadigoushki
- Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Tallahassee, FL 32310, USA; Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA.
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2
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Dos Santos Silva Araújo L, Lazzara G, Chiappisi L. Cyclodextrin/surfactant inclusion complexes: An integrated view of their thermodynamic and structural properties. Adv Colloid Interface Sci 2021; 289:102375. [PMID: 33592397 DOI: 10.1016/j.cis.2021.102375] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 01/25/2021] [Accepted: 01/27/2021] [Indexed: 12/14/2022]
Abstract
Cyclodextrins (CDs) play an important role in self-assembly systems of amphiphiles. The structure of CDs provides distinguished physicochemical properties, including the ability to form host-guest complexes. The complexation affects the properties of guest molecules and can produce supramolecular aggregates with desirable characteristics for fundamental and practical applications. Surfactants are particularly attractive host molecules due to their wide variety, availability, responsiveness to different stimuli, and high relevance in different fields, e.g. medical, cosmetic, pharmaceutical, and food industries. The tendency of organization in higher-order supramolecular aggregates arises the interest in applying such versatile complexes in the development of novel materials. In this review, we provide a comprehensive overview of the thermodynamics aspects of surfactants and CDs inclusion complexes formation in aqueous environment, emphasizing the assessment of the interactions, thermodynamic driving forces, and structural aspects. Also, the most common analytical techniques used to gather deep insight into the aspects of CDs complexes are discussed and the perspectives for the surfactant-cyclodextrin complexes are pointed out.
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Affiliation(s)
- Larissa Dos Santos Silva Araújo
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze pad 17, 90128 Palermo, Italy; Institut Max von Laue - Paul Langevin, 71 avenue des Martyrs, 38042 Grenoble, France
| | - Giuseppe Lazzara
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze pad 17, 90128 Palermo, Italy.
| | - Leonardo Chiappisi
- Institut Max von Laue - Paul Langevin, 71 avenue des Martyrs, 38042 Grenoble, France.
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3
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Torchio A, Boffito M, Gallina A, Lavella M, Cassino C, Ciardelli G. Supramolecular hydrogels based on custom-made poly(ether urethane)s and cyclodextrins as potential drug delivery vehicles: design and characterization. J Mater Chem B 2020; 8:7696-7712. [DOI: 10.1039/d0tb01261k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A library of poly(ether urethane)-based supramolecular hydrogels was designed, showing quick gelation, no phase separation, remarkable mechanical and self-healing properties.
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Affiliation(s)
- Alessandro Torchio
- Department of Mechanical and Aerospace Engineering
- Politecnico di Torino
- Torino
- Italy
- Department of Surgical Sciences
| | - Monica Boffito
- Department of Mechanical and Aerospace Engineering
- Politecnico di Torino
- Torino
- Italy
| | - Andrea Gallina
- Department of Mechanical and Aerospace Engineering
- Politecnico di Torino
- Torino
- Italy
- Department of Science and Technological Innovation
| | - Mario Lavella
- Department of Mechanical and Aerospace Engineering
- Politecnico di Torino
- Torino
- Italy
- Department of Management
| | - Claudio Cassino
- Department of Science and Technological Innovation
- Università del Piemonte Orientale “A. Avogadro”
- Alessandria
- Italy
| | - Gianluca Ciardelli
- Department of Mechanical and Aerospace Engineering
- Politecnico di Torino
- Torino
- Italy
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4
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Shang C, Chen Y, Zhang C, Deng Z, Wu Z. Destruction of chitosan capsules based on host-guest interaction and controllable release of encapsulated dyes. J Appl Polym Sci 2017. [DOI: 10.1002/app.45229] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Chunyang Shang
- School of Material Science and Engineering; Wuhan University of Technology; Wuhan 430070 China
| | - Yanjun Chen
- School of Material Science and Engineering; Wuhan University of Technology; Wuhan 430070 China
| | - Chaocan Zhang
- School of Material Science and Engineering; Wuhan University of Technology; Wuhan 430070 China
| | - Zongyi Deng
- School of Material Science and Engineering; Wuhan University of Technology; Wuhan 430070 China
| | - Zhihui Wu
- School of Material Science and Engineering; Wuhan University of Technology; Wuhan 430070 China
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5
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Zhou C, Wang D, Cao M, Chen Y, Liu Z, Wu C, Xu H, Wang S, Wang Y. Self-Aggregation, Antibacterial Activity, and Mildness of Cyclodextrin/Cationic Trimeric Surfactant Complexes. ACS APPLIED MATERIALS & INTERFACES 2016; 8:30811-30823. [PMID: 27798831 DOI: 10.1021/acsami.6b11667] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Despite efficacious antimicrobial activity, cationic oligomeric surfactants show strong skin irritation potential due to their larger cationic charge numbers and multiple hydrophobic chains. This work reports that the incorporation of α-, β-, and γ-CDs with different cavity sizes can effectively improve the mildness of cationic ammonium trimeric surfactant DTAD with a star-shaped spacer while maintaining its high antibacterial activity. On the basis of the different cavity sizes of CDs and the asymmetry in the spacer of DTAD, the CD/DTAD mixtures form α-CD@DTAD, 2α-CD@DTAD, β-CD@DTAD, and γ-CD@DTAD complexes. Compared to DTAD, these CD/DTAD complexes show much stronger self-assembly ability with much lower critical aggregation concentrations (CAC) and form more diverse aggregates with reduced zeta potential. Just above their CACs, the CD/DTAD complexes form vesicles or solid spherical aggregates of ∼50 nm and then transform into small micelles of ∼10 nm as the concentration increases. The strong self-assembly ability and the multiple sites of hydrogen bonds of the CD/DTAD complexes endow them with high antibacterial activity against E. coli, showing a very low minimum inhibitory concentration (2.22-2.48 μM) comparable to that of DTAD. In particular, the addition of CDs significantly reduces the abilities of DTAD in solubilizing zein (a skin model protein) and in binding with zein, and the mildness decreases in the order of 2α-CD@DTAD > β-CD@DTAD > γ-CD@DTAD > α-CD@DTAD. This tendency depends on their different self-assembling structures, and the formation of vesicles is approved to be in favor of the improvement of the mildness.
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Affiliation(s)
- Chengcheng Zhou
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | - Dong Wang
- Centre for Bioengineering and Biotechnology, China University of Petroleum (East China) , Qingdao 266580, People's Republic of China
| | - Meiwen Cao
- Centre for Bioengineering and Biotechnology, China University of Petroleum (East China) , Qingdao 266580, People's Republic of China
| | - Yao Chen
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | - Zhang Liu
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | - Chunxian Wu
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | - Hai Xu
- Centre for Bioengineering and Biotechnology, China University of Petroleum (East China) , Qingdao 266580, People's Republic of China
| | | | - Yilin Wang
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
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6
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Exploring 3D structural influences of aliphatic and aromatic chemicals on α-cyclodextrin binding. J Colloid Interface Sci 2016; 468:42-50. [DOI: 10.1016/j.jcis.2016.01.032] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Revised: 01/14/2016] [Accepted: 01/15/2016] [Indexed: 11/17/2022]
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7
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Pessêgo M, Basílio N, Muñiz MC, García-Río L. Competitive counterion complexation allows the true host : guest binding constants from a single titration by ionic receptors. Org Biomol Chem 2016; 14:6442-8. [DOI: 10.1039/c6ob00870d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
From a single titration experiment and considering a counterion competitive and/or competitive-cooperative complexation model, allows us to obtain the true binding constants and the stoichiometry of the host:guest complexes.
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Affiliation(s)
- Márcia Pessêgo
- Laboratório Associado para a Química Verde (LAQV)
- REQUIMTE
- Departamento de Química
- Faculdade de Ciências e Tecnologia
- Universidade NOVA de Lisboa
| | - Nuno Basílio
- Laboratório Associado para a Química Verde (LAQV)
- REQUIMTE
- Departamento de Química
- Faculdade de Ciências e Tecnologia
- Universidade NOVA de Lisboa
| | - M. Carmen Muñiz
- Departamento de Matemática Aplicada
- Facultad de Matemáticas
- Universidade de Santiago de Compostela
- 15782 Santiago de Compostela
- Spain
| | - Luis García-Río
- Departamento de Química Física
- Centro de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS)
- Facultade de Química
- Universidade de Santiago de Compostela
- 15782 Santiago de Compostela
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8
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Viscometric Study of the Inclusion Complex Between β-Cyclodextrin and HTAC in Aqueous Solution. J SURFACTANTS DETERG 2015. [DOI: 10.1007/s11743-015-1687-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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9
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Gerola AP, Silva DC, Jesus S, Carvalho RA, Rubira AF, Muniz EC, Borges O, Valente AJM. Synthesis and controlled curcumin supramolecular complex release from pH-sensitive modified gum-arabic-based hydrogels. RSC Adv 2015. [DOI: 10.1039/c5ra14331d] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Delivery of a curcumin supramolecular complex from pH-responsive gum arabic-based hydrogels.
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Affiliation(s)
- Adriana P. Gerola
- CQC
- Department of Chemistry
- University of Coimbra
- 3004-535 Coimbra
- Portugal
| | - Danielle C. Silva
- CQC
- Department of Chemistry
- University of Coimbra
- 3004-535 Coimbra
- Portugal
| | - Sandra Jesus
- Faculty of Pharmacy
- University of Coimbra
- Coimbra
- Portugal
- CNC
| | - Rui A. Carvalho
- Department of Life Sciences
- University of Coimbra
- 3004-535 Coimbra
- Portugal
| | - Adley F. Rubira
- Grupo de Materiais Poliméricos e Compósitos
- GMPC
- Chemistry Department
- Maringá State University
- 87020-900 Maringá
| | - Edvani C. Muniz
- Grupo de Materiais Poliméricos e Compósitos
- GMPC
- Chemistry Department
- Maringá State University
- 87020-900 Maringá
| | - Olga Borges
- Faculty of Pharmacy
- University of Coimbra
- Coimbra
- Portugal
- CNC
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10
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Chen Y, Yao R, Wang Y, Chen M, Qiu T, Zhang C. CdS QDs-chitosan microcapsules with stimuli-responsive property generated by gas–liquid microfluidic technique. Colloids Surf B Biointerfaces 2015; 125:21-7. [DOI: 10.1016/j.colsurfb.2014.11.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Revised: 10/20/2014] [Accepted: 11/03/2014] [Indexed: 10/24/2022]
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11
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Szente L, Puskás I, Csabai K, Fenyvesi É. Supramolecular Proteoglycan Aggregate Mimics: Cyclodextrin-Assisted Biodegradable Polymer Assemblies for Electrostatic-Driven Drug Delivery. Chem Asian J 2014; 9:1365-72. [DOI: 10.1002/asia.201301391] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Revised: 01/14/2013] [Indexed: 11/09/2022]
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12
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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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13
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Okubo T. Inclusional association as studied by the drying dissipative structure. Part 3. Drying pattern of aqueous mixtures of β-cyclodextrin and n-alkyltrimethylammonium bromide. Colloid Polym Sci 2013. [DOI: 10.1007/s00396-013-3009-7] [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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14
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Zhou C, Cheng X, Zhao Q, Yan Y, Wang J, Huang J. Self-assembly of nonionic surfactant Tween 20@2β-CD inclusion complexes in dilute solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:13175-13182. [PMID: 24073872 DOI: 10.1021/la403257v] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
It has long been considered that the addition of cyclodextrins (CDs) disfavors the self-assembly of surfactants in dilute solutions since the hydrophobic effect is destroyed upon the formation of the hydrophiphilic CD/surfactant inclusion complex. However, in this work, we found that β-CD/nonionic surfactant inclusion complexes are able to self-assemble into vesicles in dilute solutions, namely in solutions with concentration lower than the CMC of surfactants. When using Tween 20 as a model surfactant, HNMR and MS measurements indicate that the building block for the vesicles is the channel type Tween 20@2β-CD inclusion complex. Structure and IR analysis suggests that the self-assembly of hydrophilic Tween 20@2β-CD is driven by H-bonds between both the headgroup of Tween 20 and the hydroxyl groups of β-CD. The self-assembly of the inclusion complex between the β-CD and the nonionic surfactant in dilute solution is found to be a general phenomenon. Undoubtedly, surfactant@2β-CD inclusion complex can be a novel building block for nonamphiphilic self-assembly, which provides a new physical insight for the influence of cyclodextrins on the self-assembly of surfactants.
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Affiliation(s)
- Chengcheng Zhou
- College of Chemistry and Chemical Enigineering, Xinjiang University , Urumqi, 830046, People's Republic of China
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Rogalski M, Modaressi A, Magri P, Mutelet F, Grydziuszko A, Wlazło M, Domańska U. Physico-chemical properties and phase behavior of the ionic liquid-β-cyclodextrin complexes. Int J Mol Sci 2013; 14:16638-55. [PMID: 23945559 PMCID: PMC3759929 DOI: 10.3390/ijms140816638] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Revised: 07/30/2013] [Accepted: 07/31/2013] [Indexed: 12/02/2022] Open
Abstract
The solubility of β-cyclodextrin (β-CD) in ionic liquids (ILs) and the activity coefficients at infinite dilution (γ13(∞)) of more than 20 solutes (alkanes, aromatic hydrocarbons, alcohols) were measured in four chosen ionic liquids, their mixtures with β-CD, and in the β-CD at high temperatures from 338 to 398 K using the inverse gas chromatography. The intermolecular interactions, inclusion complexes and the possible increasing of the solubility of β-CD in water using the IL are presented. The solubility of β-CD in ten chosen hydrophobic ILs at the temperature T = 423 K was detected. The solid-liquid phase diagrams (SLE) of {IL (1) + β-CD (2)} binary systems at the high mole fraction of the IL were measured for three systems (1-ethyl-3-methylimidazolium chloride, [EMIM][Cl], 1-ethyl-3-methylimidazolium bromide, [EMIM][Br]; and for 1-butyl-3-methylimidazolium chloride, [BMIM][Cl]). The eutectic points were determined at the high IL concentration for all binary systems. The intermolecular interaction and the possibility of inclusion complexes of the IL and/or solvents with β-CD were discussed. The infrared spectroscopy, IR was used for the description of the intermolecular interactions in the (β-CD + IL) systems. It was shown via the activity coefficients at infinite dilution results that the inclusion complexes are dependent on the temperature. The addition of β-CD to the IL does not improve the selectivity of the separation of the aliphatics from aromatics.
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Affiliation(s)
- Marek Rogalski
- LCP-A2MC, EA 4164, Université de Lorraine, 1, bd Arago-57078 METZ, Cedex 3, France; E-Mails: (M.R.); (A.M.); (P.M.)
| | - Ali Modaressi
- LCP-A2MC, EA 4164, Université de Lorraine, 1, bd Arago-57078 METZ, Cedex 3, France; E-Mails: (M.R.); (A.M.); (P.M.)
| | - Pierre Magri
- LCP-A2MC, EA 4164, Université de Lorraine, 1, bd Arago-57078 METZ, Cedex 3, France; E-Mails: (M.R.); (A.M.); (P.M.)
| | - Fabrice Mutelet
- Institut National Polytechnique De Lorraine, Nancy Université, 2 av.de la Forêt de Haye BP3, Vandceuvre-lès-Nancy Cedex 54501, France; E-Mail:
| | - Aleksandra Grydziuszko
- Department of Physical Chemistry, Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, Warsaw 00-664, Poland; E-Mails: (A.G.); (M.W.)
| | - Michał Wlazło
- Department of Physical Chemistry, Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, Warsaw 00-664, Poland; E-Mails: (A.G.); (M.W.)
| | - Urszula Domańska
- Department of Physical Chemistry, Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, Warsaw 00-664, Poland; E-Mails: (A.G.); (M.W.)
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16
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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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17
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Ondo D, Tkadlecová M, Dohnal V, Rak J, Kvíčala J, Lehmann JK, Heintz A, Ignatiev N. Interaction of Ionic Liquids Ions with Natural Cyclodextrins. J Phys Chem B 2011; 115:10285-97. [DOI: 10.1021/jp205039g] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | | | | | - Jochen K. Lehmann
- Department of Physical Chemistry, University of Rostock, Hermannstrasse 14, D-18055 Rostock, Germany
| | - Andreas Heintz
- Department of Physical Chemistry, University of Rostock, Hermannstrasse 14, D-18055 Rostock, Germany
| | - Nikolai Ignatiev
- PC-RL ILs, Merck KGaA, Frankfurterstrasse 250, D-64293 Darmstadt, Germany
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19
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Dou Z, Xing H, Xiao J. Hydrogenated and Fluorinated Host–Guest Surfactants: Complexes of Cyclodextrins with Alkanes and Fluoroalkyl‐Grafted Alkanes. Chemistry 2011; 17:5373-80. [DOI: 10.1002/chem.201003443] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2010] [Indexed: 11/09/2022]
Affiliation(s)
- Zeng‐Pei Dou
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871 (P.R. China), Fax: (+86) 10‐62561871
| | - Hang Xing
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871 (P.R. China), Fax: (+86) 10‐62561871
- Beijing FLUOBON Surfactant Institute, Beijing 100080 (P.R. China)
| | - Jin‐Xin Xiao
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871 (P.R. China), Fax: (+86) 10‐62561871
- Beijing FLUOBON Surfactant Institute, Beijing 100080 (P.R. China)
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20
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Carvalho RA, Correia HA, Valente AJM, Söderman O, Nilsson M. The effect of the head-group spacer length of 12-s-12 gemini surfactants in the host-guest association with β-cyclodextrin. J Colloid Interface Sci 2010; 354:725-32. [PMID: 21144532 DOI: 10.1016/j.jcis.2010.11.024] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Revised: 11/10/2010] [Accepted: 11/11/2010] [Indexed: 11/19/2022]
Abstract
NMR spectroscopy has been used to study and characterize the interactions in solution between β-CD and alkyl-α,ω-bis(dodecyldimethyl ammonium bromide) gemini surfactants with the following head-group spacer lengths: 2, 4, 6, 8, and 10. The application of the method of continuous variation gives as a result that 1:1 and 2:1 (β-cyclodextrin-gemini) complexes are formed; the association stoichiometry is dependent on the spacer chain length, varying from 1.5 (for s=2) to 1.8 (for s=10). Assuming a two-step mechanism, the binding constants have been computed. In general, the overall binding constant slightly increases with an increase of the number of methylene groups in the spacer. The (1)H NMR spectra of the N-(CH(3))(2) groups in β-cyclodextrin/gemini mixed solutions are split into two peaks for 12-10-12, suggesting that the gemini spacer can thread the β-cyclodextrin so that the latter is positioned between the gemini head-groups. Inspection of the ROESY spectra allowed the establishment of several spatial proximities between the protons from the β-CD and the gemini and for a spacer length of 10, the data indeed indicate that complexes are formed with the CD molecule positioned between the two charged head groups with the spacer passing through the CD molecule.
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Affiliation(s)
- R A Carvalho
- Department of Life Sciences and Center of Neurosciences, University of Coimbra, 3001-401 Coimbra, Portugal
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21
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Insights into cyclodextrin-modulated interactions between protein and surfactant at specific and nonspecific binding stages. J Colloid Interface Sci 2010; 351:180-9. [DOI: 10.1016/j.jcis.2010.07.032] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2010] [Revised: 07/14/2010] [Accepted: 07/15/2010] [Indexed: 11/23/2022]
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22
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López-García MÁ, López Ó, Maya I, Fernández-Bolaños JG. Complexation of hydroxytyrosol with β-cyclodextrins. An efficient photoprotection. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.08.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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23
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Bai Y, Xu GY, Pang JY, Sun HY, Hao AY, Xin X, Ao MQ, Yang XD. Comparative Study on the Effect of NaBr on the Interaction Between Alkyltrimethylammonium Bromide and β-Cyclodextrin. J DISPER SCI TECHNOL 2010. [DOI: 10.1080/01932690903224367] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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24
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Astray G, Mejuto J, Morales J, Rial-Otero R, Simal-Gándara J. Factors controlling flavors binding constants to cyclodextrins and their applications in foods. Food Res Int 2010. [DOI: 10.1016/j.foodres.2010.02.017] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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25
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Oertel U, Komber H, Tenkovtsev AV, Dudkina MM, Trofimov AE, Böhme F. Ionic pseudopolyrotaxanes bearing a chromophore in the side chain – A spectroscopic study in water. POLYMER 2009. [DOI: 10.1016/j.polymer.2009.10.064] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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26
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Xing H, Xiao JX. Phase Behavior of the Mixed Systems of α-, β-Cyclodextrin and Cationic-Anionic Surfactants. J DISPER SCI TECHNOL 2009. [DOI: 10.1080/01932690802476159] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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27
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Lou BS, Lin TH, Lo CZ. The interactions of phenytoin and its binding site in DI-S6 segment of Na+ channel voltage-gated peptide by NMR spectroscopy and molecular modeling study. ACTA ACUST UNITED AC 2008; 66:27-38. [PMID: 15946193 DOI: 10.1111/j.1399-3011.2005.00269.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Nuclear magnetic resonance (NMR) spectra of a model peptide (BL-DIS6), in the presence of anticonvulsant diphenyl drug, phenytoin (DPH), were measured to obtain the interactions between the selected drug and the model peptide. BL-DIS6's sequence corresponds to the S6 segment in domain I of rat brain type IIA Na+-channel. NMR studies have demonstrated that the magnitude of the chemical shifts of amide- and alpha-protons can be used as a measurement of the complex stability and binding site of the peptide. Our NMR results propose a 3(10)-helical structure for BL-DIS6, and suggest a binding cavity for DPH that involves the hydrophobic particles of residues Ans-7, Leu-8, Val-11, and Val-12. Furthermore, molecular modeling was performed to provide a possible complex conformation that the phenyl portion of DPH is accommodated in the proximity of the C-terminal residues Ala-11 and Val-12, and simultaneously the heterocyclic amine ring of DPH is perching at the residue Asn-7 periphery and stabilizing the phenyl portion deep insertion into the peptide.
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Affiliation(s)
- B-S Lou
- Chemistry Division, Center for General Education, Chang Gung University, Tao-Yuan, Taiwan.
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28
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Xing H, Lin SS, Yan P, Xiao JX. Demicellization of a mixture of cationic-anionic hydrogenated/fluorinated surfactants through selective inclusion by alpha- and beta-cyclodextrin. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:10654-10664. [PMID: 18785721 DOI: 10.1021/la8014095] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The interactions between alpha- and beta-cyclodextrin (alpha-/beta-CD) and an equimolar mixture of octyltriethylammonium bromide (OTEAB) and sodium perfluorooctanoate (SPFO) were studied by 1H and 19F NMR, surface tension, conductivity, and dynamic light scattering. It was shown that beta-CD could destroy the mixed micelles of OTEAB-SPFO by selective inclusion of SPFO. As beta-CD was added, the system was observed to undergo a process like this: beta-CD preferentially included SPFO to form 1:1 beta-CD/SPFO complexes. As the inclusion of SPFO was almost saturated, the mixed micelles broke and all OTEAB was released and exposed to aqueous surroundings. Then 1:1 beta-CD/OTEAB and 2:1 beta-CD/SPFO complexes significantly formed simultaneously. Contrary to beta-CD, alpha-CD exhibited selective inclusion to OTEAB and only weak association with SPFO. alpha-CD could also destroy the mixed micelles of OTEAB-SPFO; however, the demicellization ability of alpha-CD is much smaller than that of beta-CD. These conclusions were also well supported by the calculations of binding constants and DeltaG degrees . Different from the complexes of CD/conventional surfactants, the complexes of beta-CD/SPFO or alpha-CD/OTEAB formed by selective inclusion of CD in the mixed cationic-anionic surfactants may have contributed to the surface activity of the aqueous mixtures. The complexes of alpha-CD/OTEAB showed much more significant contribution to the surface activity than that of the complexes of beta-CD/SPFO.
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Affiliation(s)
- Hang Xing
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing, China
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29
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Energetically favorable interactions between diclofenac sodium and cyclodextrin molecules in aqueous media. J Colloid Interface Sci 2008; 326:374-81. [DOI: 10.1016/j.jcis.2008.06.039] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2008] [Revised: 06/18/2008] [Accepted: 06/18/2008] [Indexed: 11/18/2022]
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30
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Cruz JR, Becker BA, Morris KF, Larive CK. NMR characterization of the host-guest inclusion complex between beta-cyclodextrin and doxepin. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2008; 46:838-845. [PMID: 18615634 DOI: 10.1002/mrc.2267] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The interaction between doxepin, a member of the tricyclic antidepressant (TCA) class of drugs, with beta-cyclodextrin (beta-CD) was investigated using NMR. Several TCAs have been reported to form a complex with beta-CD having 1:1 stoichiometry. Previous results from UV-visible spectroscopy, fluorescence measurements, and molecular modeling indicated that for imipramine, desipramine, and amitriptyline, the TCA aliphatic tail is included in the cyclodextrin cavity with apparently no interaction of the tricyclic ring. An alternative view of the doxepin-beta-CD complex is presented in this work using analysis of complexation-induced chemical shifts (CICSs), the method of continuous variation (Job's analysis), and analysis of ROESY spectra. The Job's plot derived from the NMR spectral data confirms that the complex formed has 1:1 stoichiometry. The largest changes in the CICS data were observed for the aromatic protons of one of the doxepin rings, with much smaller chemical shift changes observed for the protons of the other aromatic ring and the doxepin tail. Perhaps the most significant evidence for inclusion of the doxepin tricyclic ring is the strong ROESY cross peaks between the doxepin aromatic resonances and the protons located inside the beta-CD cavity. Changes in the doxepin (1)H NMR spectrum and the behavior of ROESY exchange cross peaks suggest that inclusion complex formation decreases the rate of internal motions of doxepin.
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Affiliation(s)
- Jennifer R Cruz
- Department of Chemistry, University of California, Riverside, CA 92521, USA
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31
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Tamura K, Oya N, Hatanaka K, Yoshie N. Topologically Linked Branch Polymers from Mono-amino-cyclodextrins and Polyethylene Glycol Dicarboxylic Acid. Polym J 2008. [DOI: 10.1295/polymj.pj2008013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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32
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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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33
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Bernat V, Ringard-Lefebvre C, Bas GL, Perly B, Djedaïni-Pilard F, Lesieur S. Inclusion complex of n-octyl beta-D-glucopyranoside and alpha-cyclodextrin in aqueous solutions: thermodynamic and structural characterization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:3140-3149. [PMID: 18324857 DOI: 10.1021/la7034906] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Complex formation between octyl beta-D-glucopyranoside (OG) and alpha-cyclodextrin (alphaCD) was investigated on the basis of three highly accurate and appropriate experimental techniques. First, surface tension measurements showed that alphaCD directly acts on the surfactant monomers in the aqueous phase, leading to progressive depletion of the air-water interface with increasing cyclodextrin contents. Significant shift of OG critical micelle concentration (cmc) was consequently observed: the higher alphaCD concentration, the higher the cmc value. Experiments performed at surfactant and cyclodextrin concentrations in the Gibbs regime of surface tension versus OG content were performed on one hand to establish Job's plot that showed 1:1 stoichiometry of the OG-alphaCD complex and on the other hand to calculate the association constant found equal to (1.85 +/- 0.35) x 10(3) L mol(-1). An inclusion process of the surfactant alkyl residue within the cyclodextrin cavity was confirmed by one-dimensional (1)H NMR, and the structure of the mixed assembly was extensively characterized by two-dimensional NOESY (1)H NMR. OG penetrates alphaCD so that its hydrocarbon chain is embedded inside the cyclodextrin cavity, and its polar head as well as the alpha-methylene group emerges outside the alphaCD secondary face. Solubility behavior of the OG-alphaCD complex in a wide range of host-guest ratios and concentrations was finally examined by turbidity recording and optical microscopy. At very low free cyclodextrin levels in the solution, the complex presented high solubility behavior up to more than 70 mM. By increasing nonassociated alphaCD in the mixture, propensity of the cyclodextrin molecules to crystallize was observed at concentrations far below the 100 mM aqueous solubility of the pure cyclodextrin. The hexagonal shape of the crystals seen in the optical microscopy images suggested they were, partially at least, composed of the solid complex.
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Affiliation(s)
- Valérie Bernat
- Laboratoire Physico-Chimie Pharmacotechnie Biopharmacie, Faculté de pharmacie, UMR CNRS 8612, Université Paris-Sud, 5 rue Jean-Baptiste Clément, F-92296 Châtenay-Malabry Cedex, France
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34
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Abstract
Cyclodextrins (CDs) attract much attention for industrial applications and academic research. A few experimental methods for determination of the binding constant between CD and a guest molecule were reviewed critically. A hydrophile–hydrophobe matching model for host–guest docking was proposed for estimation of the binding constant and the solution structure of the complex. Rather detailed solution structures of CD complexes were determined by proton NMR spectroscopy, aided by calculations of molecular mechanics and surface areas, and were used to analyze the binding constants. The binding constants of CDs with multi-site guests were analyzed on the basis of their solution structures. The working mechanisms and physicochemical predictions in a few pharmaceutical applications of CDs were proposed on the basis of detailed solution structures and accurate binding constants.
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35
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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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36
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Yan P, Tang J, Xiao J. Interaction between β‐Cyclodextrin and Mixed Cationic‐Anionic Surfactants (2): Aggregation Behavior. J DISPER SCI TECHNOL 2007. [DOI: 10.1080/01932690701283086] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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37
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Yan P, Tang J, Xiao J. Interaction between β‐Cyclodextrin and Mixed Cationic‐Anionic Surfactants (1): Thermodynamic Study. J DISPER SCI TECHNOL 2007. [DOI: 10.1080/01932690701282708] [Citation(s) in RCA: 7] [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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38
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Thermodynamic Study of the Inclusion Interaction between Gemini Surfactants and Cyclodextrins by Isothermal Titration Microcalorimetry. J SOLUTION CHEM 2007. [DOI: 10.1007/s10953-006-9115-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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39
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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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40
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How does β-cyclodextrin affect the aggregation of sodium perfluoroheptanoate in aqueous solution: a 19F NMR study. J INCL PHENOM MACRO 2007. [DOI: 10.1007/s10847-006-9201-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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41
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Andrade-Dias C, Goodfellow BJ, Cunha-Silva L, Teixeira-Dias JJC. Inclusion complexes of 2-phenoxyethanol and alkoxyethanols in cyclodextrins: an 1H NMR study. J INCL PHENOM MACRO 2007. [DOI: 10.1007/s10847-006-9204-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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42
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Liu Y, Ke CF, Zhang HY, Wu WJ, Shi J. Reversible 2D Pseudopolyrotaxanes Based On Cyclodextrins and Cucurbit[6]uril. J Org Chem 2006; 72:280-3. [PMID: 17194112 DOI: 10.1021/jo0617159] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this paper, a pseudorotaxane (2) was synthesized by reaction of cucurbit [6]uril with 6-[(6-aminohexyl)amino]-6-deoxy-beta-cyclodextrin chloride. Subsequently, pseudorotaxanes 2 were further assembled to form a 2D pseudopolyrotaxane (3) through an alpha,omega-PPG2000 diamino polymer threading the cavities of cyclodextrins in 2, and the resulting pseudopolyrotaxane was comprehensively characterized by FT-IR, NMR, TG-DTA, elemental analysis, and transmission electron microscopy. Significantly, the 2D pseudopolyrotaxane can turn into a main-chain pseudopolyrotaxane in the presence of base, and then the addition of alpha-cyclodextrins may result in a reversible switch between two different 2D pseudopolyrotaxanes.
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Affiliation(s)
- Yu Liu
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, P R China.
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43
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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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44
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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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45
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Karlberg M, Piculell L, Ragout S. Gels of hydrophobically modified hydroxyethyl cellulose cross-linked by amylose. Competition with cyclodextrin. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:2241-8. [PMID: 16489813 DOI: 10.1021/la052177i] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Previous work has shown that amylose (AM) can cross-link hydrophobically modified polymers by inclusion complexation, whereby thermoreversible cold-setting gels are formed. In this work, the competition between AM and cyclodextrin (CD) for the formation of inclusion complexes with hydrophobically modified hydroxyethyl cellulose (HMHEC) is investigated. A detailed study of viscosity, NMR self-diffusion, and chemical shifts of the two-component mixture, CD and HMHEC, was performed. The results imply that 2:1 (CD:polymer hydrophobe) complexes may be formed. The three-component mixtures, HMHEC/AM/CD, were investigated by rheology, NMR self-diffusion, and intensities of the NMR resonance peaks. The CD molecules competed efficiently with the AM molecules, as seen by a decreased storage modulus, an increased self-diffusion of AM and HMHEC, and increased NMR intensities of the HMHEC hydrophobes, as the concentration of CD increased in the solution. A high concentration of CD is needed in the mixtures to inhibit all interactions between HMHEC and AM, and it was shown that there still is an effect of AM at excess CD concentration in the mixtures.
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Affiliation(s)
- Maria Karlberg
- Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
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46
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Competition between the Hydrated Fluoride Anion and Hexanoic Acid for Inclusion in β-Cyclodextrin: An 1H-NMR Study in Aqueous Solution. J INCL PHENOM MACRO 2006. [DOI: 10.1007/s10847-005-3489-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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47
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Ishikawa S, Hirota S, Neya S, Funasaki N. Molecular Motions of .ALPHA.-Cyclodextrin on a Dodecyl Chain Studied by Molecular Dynamics Simulations. Chem Pharm Bull (Tokyo) 2006; 54:528-34. [PMID: 16595958 DOI: 10.1248/cpb.54.528] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Motions of an alpha-cyclodextrin (alpha-CD) molecule on a dodecyl chain adopting the all-trans conformation were investigated in the presence of water by molecular dynamics simulations with CVFF force fields, where the trimethylammonium group of dodecyltrimethylammonium bromide (DTAB) is protruded outside the secondary hydroxyl rim of alpha-CD (the secondary-in structure). The alpha-CD molecule shuttled rapidly on the chain without decomplexation. This rapid motion is consistent with the NMR data. The plane formed by 6 O4 atoms of alpha-CD is most populated between the C6 and C7 atoms of DTAB. This structure is very close to that estimated by NMR. The alpha-CD molecule underwent a restricted rotation in a range of 60 degrees with regard to the plane of the dodecyl chain: this plane at the most population is middle between the two diagonal lines of the normal hexagon formed by 6 O4 atoms of alpha-CD. The published NMR data were reanalyzed in terms of the rotation angle, and a slightly better structure was obtained. The distortion of the alpha-CD cavity from the normal hexagon was decreased upon complex formation with DTAB. The deviation of the center of alpha-CD from the center of the dodecyl chain predicted by molecular dynamics simulations is consistent with the NMR data. The secondary-in structure is energetically more stable than the primary-in structure, as calculated by molecular mechanics with CVFF and Amber force fields. This result is consistent with the NMR data. Molecular dynamics simulations were also carried out for the primary-in structure. Some of the results are close to those of the secondary-in structure.
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Affiliation(s)
- Seiji Ishikawa
- Department of Physical Chemistry, 21st Century COE Program, Kyoto Pharmaceutical University, Japan
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Chemical shifts as a novel measure of interactions between two binding sites of symmetric dialkyldimethylammonium bromides to α-cyclodextrin. Anal Chim Acta 2006. [DOI: 10.1016/j.aca.2005.08.079] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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49
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Cabaleiro-Lago C, Nilsson M, Söderman O. Self-diffusion NMR studies of the host-guest interaction between beta-cyclodextrin and alkyltrimethylammonium bromide surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:11637-44. [PMID: 16316094 DOI: 10.1021/la0516835] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Diffusion measurements by nuclear magnetic resonance (NMR) spectroscopy were used to investigate the host-guest association between beta-cyclodextrin (CD) and alkyltrimethylammonium bromide surfactants with different chain lengths, ranging from 6 up to 16 carbons. The scope and limitations of the method in the study of formation of inclusion complexes are discussed. The influences of the presence of CD in the micellization process have been studied, and the apparent critical micellar concentration and the self-diffusion coefficients of the species present in the systems have been calculated. The stoichiometries of the different complexes have been determined. Evidence for the formation of a 2:1 complex in the case of C(16)TAB has been found.
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Affiliation(s)
- Celia Cabaleiro-Lago
- Physical Chemistry 1, Center for Chemistry and Engineering, Lund University, Sweden.
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Pseudo[3]rotaxane Type Compelxation between α- and β-Cyc1odextrins and N,N′-Dsiheptyl-4,4′-bipyridinium. J INCL PHENOM MACRO 2005. [DOI: 10.1007/s10847-005-7367-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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