1
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Lamichhane HB, Arrigan DWM. Modulating the ion-transfer electrochemistry of perfluorooctanoate with serum albumin and β-cyclodextrin. Analyst 2024; 149:2647-2654. [PMID: 38546701 DOI: 10.1039/d3an02164e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/30/2024]
Abstract
Per- and polyfluoroalkyl substances (PFAS) are durable synthetic pollutants that persist in the environment and resist biodegradation. Ion-transfer electrochemistry at aqueous-organic interfaces is a simple strategy for the detection of ionised PFAS. Herein, we investigate the modulation of the ion transfer voltammetry of perfluorooctanoate (PFOA) at liquid-liquid micro-interface arrays by aqueous phase bovine serum albumin (BSA) or β-cyclodextrin (β-CD) and examine the determination of association constants for these binding interactions. By tracking the ion transfer current due to ionised, uncomplexed PFOA as a function of BSA or β-CD concentration, titration curves are produced. Fitting of a binding isotherm to these data provides the association constants. The association constant of PFOA with the BSA determined in this way was ca. 105 M-1 assuming a 1 : 1 binding. Likewise, the association constant for PFOA with β-CD was ca. 104 M-1 for a 1 : 1 β-CD-PFOA complex. Finally, the simultaneous effect of both BSA and β-CD on the ion transfer voltammetry of PFOA was studied, showing clearly that PFOA bound to BSA is released (de-complexed) upon addition of β-CD. The results presented here show ion transfer voltammetry as a simple strategy for the study of molecular and biomolecular binding of ionised PFAS and is potentially useful in understanding the affinity of different PFAS with aqueous phase binding agents such as proteins and carbohydrates.
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Affiliation(s)
- Hum Bahadur Lamichhane
- School of Molecular and Life Sciences, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
| | - Damien W M Arrigan
- School of Molecular and Life Sciences, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
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2
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Araujo Marques I, Patiño-Agudelo ÁJ, Coelho YL, Santos Moreau PD, Neves Santa Rosa L, dos Santos Pires AC, Mendes da Silva LH. Formation and self-association of host-guest complexes between βCD and nonionic surfactants Brij. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116647] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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3
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4
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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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5
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Nano-Sized Cyclodextrin-Based Molecularly Imprinted Polymer Adsorbents for Perfluorinated Compounds-A Mini-Review. NANOMATERIALS 2015; 5:981-1003. [PMID: 28347047 PMCID: PMC5312915 DOI: 10.3390/nano5020981] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Revised: 05/14/2015] [Accepted: 05/19/2015] [Indexed: 11/24/2022]
Abstract
Recent efforts have been directed towards the design of efficient and contaminant selective remediation technology for the removal of perfluorinated compounds (PFCs) from soils, sediments, and aquatic environments. While there is a general consensus on adsorption-based processes as the most suitable methodology for the removal of PFCs from aquatic environments, challenges exist regarding the optimal materials design of sorbents for selective uptake of PFCs. This article reviews the sorptive uptake of PFCs using cyclodextrin (CD)-based polymer adsorbents with nano- to micron-sized structural attributes. The relationship between synthesis of adsorbent materials and their structure relate to the overall sorption properties. Hence, the adsorptive uptake properties of CD-based molecularly imprinted polymers (CD-MIPs) are reviewed and compared with conventional MIPs. Further comparison is made with non-imprinted polymers (NIPs) that are based on cross-linking of pre-polymer units such as chitosan with epichlorohydrin in the absence of a molecular template. In general, MIPs offer the advantage of selectivity, chemical tunability, high stability and mechanical strength, ease of regeneration, and overall lower cost compared to NIPs. In particular, CD-MIPs offer the added advantage of possessing multiple binding sites with unique physicochemical properties such as tunable surface properties and morphology that may vary considerably. This mini-review provides a rationale for the design of unique polymer adsorbent materials that employ an intrinsic porogen via incorporation of a macrocyclic compound in the polymer framework to afford adsorbent materials with tunable physicochemical properties and unique nanostructure properties.
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6
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Putta C, Sharavath V, Sarkar S, Ghosh S. Palladium nanoparticles on β-cyclodextrin functionalised graphene nanosheets: a supramolecular based heterogeneous catalyst for C–C coupling reactions under green reaction conditions. RSC Adv 2015. [DOI: 10.1039/c4ra14323j] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Palladium nanoparticles on β-cyclodextrin functionalised graphene based supramolecular heterogeneous catalyst are used for Suzuki–Miyaura and Heck–Mizoroki coupling reactions under green reaction conditions.
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Affiliation(s)
- Chandrababu Putta
- Nanomaterials Laboratory
- Inorganic and Physical Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad-500 607
- India
| | - Vittal Sharavath
- Nanomaterials Laboratory
- Inorganic and Physical Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad-500 607
- India
| | - Suprabhat Sarkar
- Nanomaterials Laboratory
- Inorganic and Physical Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad-500 607
- India
| | - Sutapa Ghosh
- Nanomaterials Laboratory
- Inorganic and Physical Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad-500 607
- India
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7
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Takezawa H, Murase T, Resnati G, Metrangolo P, Fujita M. Recognition of Polyfluorinated Compounds Through Self-Aggregation in a Cavity. J Am Chem Soc 2014; 136:1786-8. [DOI: 10.1021/ja412893c] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Hiroki Takezawa
- Department of Applied
Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Takashi Murase
- Department of Applied
Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Giuseppe Resnati
- Laboratory of Nanostructured
Fluorinated Materials, Politecnico di Milano, Via L. Mancinelli 7, IT-20131 Milano, Italy
| | - Pierangelo Metrangolo
- Laboratory of Nanostructured
Fluorinated Materials, Politecnico di Milano, Via L. Mancinelli 7, IT-20131 Milano, Italy
| | - Makoto Fujita
- Department of Applied
Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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8
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Vanthoeun K, Shimasaki K, Ono Y, Suzuki T, Kita M. Novel Interactions between [Co(NH 3) 6](ClO 4) 3 and Inclusion Compounds of Sodium Dodecyl Sulfate and Cyclodextrins. CHEM LETT 2013. [DOI: 10.1246/cl.130031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Keo Vanthoeun
- Graduate School of Natural Science and Technology, Okayama University
| | | | - Yasuhiko Ono
- Graduate School of Education, Okayama University
| | - Takayoshi Suzuki
- Graduate School of Natural Science and Technology, Okayama University
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9
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Kawano S, Kida T, Takemine S, Matsumura C, Nakano T, Kuramitsu M, Adachi K, Akashi M. Efficient Removal and Recovery of Perfluorinated Compounds from Water by Surface-tethered β-Cyclodextrins on Polystyrene Particles. CHEM LETT 2013. [DOI: 10.1246/cl.121239] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Shintaro Kawano
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University
| | - Toshiyuki Kida
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University
| | | | | | - Takeshi Nakano
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University
| | | | | | - Mitsuru Akashi
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University
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10
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Brocos P, Banquy X, Díaz-Vergara N, Pérez-Casas S, Piñeiro Á, Costas M. A Critical Approach to the Thermodynamic Characterization of Inclusion Complexes: Multiple-Temperature Isothermal Titration Calorimetric Studies of Native Cyclodextrins with Sodium Dodecyl Sulfate. J Phys Chem B 2011; 115:14381-96. [DOI: 10.1021/jp208740b] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pilar Brocos
- Departamento de Física Aplicada, Facultad de Física, Universidad de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain
| | - Xavier Banquy
- Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
| | - Norma Díaz-Vergara
- Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
| | - Silvia Pérez-Casas
- Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
| | - Ángel Piñeiro
- Departamento de Física Aplicada, Facultad de Física, Universidad de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain
- Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
| | - Miguel Costas
- Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
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11
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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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12
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Karoyo AH, Borisov AS, Wilson LD, Hazendonk P. Formation of Host-Guest Complexes of β-Cyclodextrin and Perfluorooctanoic Acid. J Phys Chem B 2011; 115:9511-27. [DOI: 10.1021/jp110806k] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Abdalla H. Karoyo
- University of Saskatchewan, Department of Chemistry, Saskatoon, SK, S7N 5C9, Canada
| | - Alex S. Borisov
- University of Lethbridge, Department of Chemistry and Biochemistry, Lethbridge, AB, Canada
| | - Lee D. Wilson
- University of Saskatchewan, Department of Chemistry, Saskatoon, SK, S7N 5C9, Canada
| | - Paul Hazendonk
- University of Lethbridge, Department of Chemistry and Biochemistry, Lethbridge, AB, Canada
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13
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Brocos P, Díaz-Vergara N, Banquy X, Pérez-Casas S, Costas M, Piñeiro Á. Similarities and Differences Between Cyclodextrin−Sodium Dodecyl Sulfate Host−Guest Complexes of Different Stoichiometries: Molecular Dynamics Simulations at Several Temperatures. J Phys Chem B 2010; 114:12455-67. [DOI: 10.1021/jp103223u] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pilar Brocos
- Departamento de Física Aplicada, Facultad de Física, Universidad de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain, and Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
| | - Norma Díaz-Vergara
- Departamento de Física Aplicada, Facultad de Física, Universidad de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain, and Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
| | - Xavier Banquy
- Departamento de Física Aplicada, Facultad de Física, Universidad de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain, and Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
| | - Silvia Pérez-Casas
- Departamento de Física Aplicada, Facultad de Física, Universidad de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain, and Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
| | - Miguel Costas
- Departamento de Física Aplicada, Facultad de Física, Universidad de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain, and Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
| | - Ángel Piñeiro
- Departamento de Física Aplicada, Facultad de Física, Universidad de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain, and Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F. 04510, Mexico
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14
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Mohamed MH, Wilson LD, Headley JV. Estimation of the surface accessible inclusion sites of β-cyclodextrin based copolymer materials. Carbohydr Polym 2010. [DOI: 10.1016/j.carbpol.2009.11.014] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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15
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Beta-cyclodextrin-bonded silica assists alkaline phosphatase and carbonic anhydrase refolding in a solid phase assisted refolding approach. Process Biochem 2010. [DOI: 10.1016/j.procbio.2009.09.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Mohamed MH, Wilson LD, Headley JV, Peru KM. A spectral displacement study of cyclodextrin/naphthenic acids inclusion complexes. CAN J CHEM 2009. [DOI: 10.1139/v09-140] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The spectral displacement technique has been used to obtain 1:1 β-cyclodextrin (β-CD)/carboxylate anion equilibrium binding constants (K2) for some complex mixtures of naphthenic acids (NAs) and some examples of single-component NAs in aqueous solution. Three specific examples of single-component NAs were chosen with variable Z values as follows: 2-hexyldecanoic acid (Z = 0; S1), trans-4-pentylcyclohexanecarboxylic acid (Z = –2; S2), and dicyclohexylacetic acid (Z = –4; S3). The estimated K2 values for S1, S2, and S3 are as follows: 1.42 × 103 M–1, 52.2 × 104 M–1, and 13.1 × 104 M–1, respectively. The corresponding K2 values are 2.34 × 104 M–1 and 1.27 × 104 M–1 for commercial (Fluka) and industrial (Syncrude) sourced NAs, respectively. The magnitude of K2 for 1:1 complexes formed between β-CD and S1, S2, or S3 did not correlate with the degree of hydrogen deficiency (Z-series) but there was a correlation with the size of the guest molecules (n) examined in this study. The correlation between complex stability and the relative size of the lipophilic fragments of the guest molecule are related to the importance of the hydrophobic effect for inclusion of such carboxylic acid guest molecules within β-CD.
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Affiliation(s)
- Mohamed H. Mohamed
- Department of Chemistry, Thorvaldson Building, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 5C9, Canada
- Water Science and Technology Directorate, Environment Canada, 11 Innovation Boulevard, Saskatoon, SK S7N 3H5, Canada
| | - Lee D. Wilson
- Department of Chemistry, Thorvaldson Building, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 5C9, Canada
- Water Science and Technology Directorate, Environment Canada, 11 Innovation Boulevard, Saskatoon, SK S7N 3H5, Canada
| | - John V. Headley
- Department of Chemistry, Thorvaldson Building, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 5C9, Canada
- Water Science and Technology Directorate, Environment Canada, 11 Innovation Boulevard, Saskatoon, SK S7N 3H5, Canada
| | - Kerry M. Peru
- Department of Chemistry, Thorvaldson Building, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 5C9, Canada
- Water Science and Technology Directorate, Environment Canada, 11 Innovation Boulevard, Saskatoon, SK S7N 3H5, Canada
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17
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García-Río L, Méndez M, Paleo MR, Sardina FJ. New Insights in Cyclodextrin: Surfactant Mixed Systems from the Use of Neutral and Anionic Cyclodextrin Derivatives. J Phys Chem B 2007; 111:12756-64. [DOI: 10.1021/jp073510p] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- L. García-Río
- Departamento de Química Física and Departamento de Química Orgánica, Facultad de Química, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - M. Méndez
- Departamento de Química Física and Departamento de Química Orgánica, Facultad de Química, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - M. R. Paleo
- Departamento de Química Física and Departamento de Química Orgánica, Facultad de Química, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - F. J. Sardina
- Departamento de Química Física and Departamento de Química Orgánica, Facultad de Química, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
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18
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Khodagholi F, Yazdanparast R, Sadeghirizi A. The Glycophosphatidylinositol Anchor Oppositely Affects Unfolding and Refolding of Alkaline Phosphatase. J Biomol Struct Dyn 2007; 25:189-94. [PMID: 17718598 DOI: 10.1080/07391102.2007.10507168] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Regarding the world wide success of artificial chaperone-assisted protein refolding technique and based on its well worked-out mechanism, it is anticipated that the lipid moieties of glycosylphosphatidylinositol (GPI) group, which is present in some membrane proteins, might interfere with the capturing step of the technique. To find an answer, we evaluated the chemical denaturation and also the refolding behavior of insoluble and soluble alkaline phosohatase (ALP), with or without GPI group, respectively. The results indicated that the presence of GPI in the enzyme increased the stability of the protein against chemical denaturation while it decreased its refolding yield by the artificial chaperone refolding technique. The lower refolding yield, compared to soluble ALP (sALP), might be due to a less efficient stripping step caused by new interactions imparted to the refolding elements of the system especially those among the hydrophobic tails of GPI and the capturing agent of the technique. These new interactions will interrupt the kinetics of detergent stripping from the captured molecules by the stripping agent (i.e., cyclodextrins). This situation will lead to higher intermolecular hydrophobic interactions among the refolding protein intermediates leading to their higher misfolding and aggregation.
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Affiliation(s)
- Fariba Khodagholi
- Institute of Biochemistry and Biophysics, University of Tehran, P. O. Box 13145-1384, Tehran, Iran
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19
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Khodagholi F, Yazdanparast R. Cooperative effects of artificial chaperone and Mg2+ ions on alkaline phosphatase refolding. Biochem Eng J 2007. [DOI: 10.1016/j.bej.2007.02.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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20
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A kinetic study of oxidation of β-cyclodextrin by permanganate in aqueous media. Colloids Surf A Physicochem Eng Asp 2007. [DOI: 10.1016/j.colsurfa.2006.08.048] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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21
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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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22
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Pirzadeh P, Moosavi-Movahedi AA, Hemmateenejad B, Ahmad F, Shamsipur M, Saboury AA. Chemometric studies of lysozyme upon interaction with sodium dodecyl sulfate and β-cyclodextrin. Colloids Surf B Biointerfaces 2006; 52:31-8. [PMID: 16839751 DOI: 10.1016/j.colsurfb.2006.05.019] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2006] [Revised: 04/22/2006] [Accepted: 05/26/2006] [Indexed: 11/18/2022]
Abstract
The interaction of hen egg-white lysozyme with sodium n-dodecyl sulfate (SDS) as an anionic surfactant was investigated by UV-vis spectrophotometry at different pHs at 25 degrees C using HCl/glycine and NaOH/glycine for acidic and basic pH ranges, respectively. Analysis of the spectral data using chemometric method gave the evidence for the existence of intermediate components during the cited interaction. Results also indicated a connection between turbidity of the protein solution upon interaction with SDS and distribution of our newly found intermediates. As intermediates are important in aggregation of proteins, beta-cyclodextrin was employed as an anti-aggregation agent and the results obtained for the lysozyme-SDS-beta-cyclodextrin ternary system were compared with those obtained in the absence of beta-cyclodextrin on distribution and mole fraction of intermediates with. It is also shown that as the distribution of intermediates broadens in a range of SDS concentrations, the turbidity and aggregation state of solution are reduced.
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Affiliation(s)
- P Pirzadeh
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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23
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Khodagholi F, Yazdanparast R. Artificial chaperone-assisted refolding of GuHCl-denatured alpha-amylase at low temperature: refolding versus aggregation. Protein J 2006; 24:303-13. [PMID: 16284728 DOI: 10.1007/s10930-005-6751-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Refolding of GuHCl-denatured alpha-amylase was investigated using the artificial chaperone-assisted method. Three different cationic detergents (CTAB, TTAB and DTAB) and two nonionic detergents (Tween 80 and Triton X-100) were evaluated as the capturing reagents along with alpha- and beta-CD as the stripping agents. The refolding yields, at a final protein concentration of 0.15 mg/ml, were 82, 71 and 66% in the presence of beta-CD and CTAB, TTAB or DTAB, respectively. To improve the refolding yield and to suppress the extent of aggregation, the initial rate of the stripping step was slowed down by maintaining the refolding environment at 4 degrees C for about 3 min followed by raising the temperature to 25 degrees C. Under this thermal procedure, the refolding yield and the extent of aggregation were changed from 82 and 25% at 25 degrees C to 94 and 7% at 4 degrees C, respectively. These findings may assist the activity recovery of recombinant proteins at relatively high concentrations.
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Affiliation(s)
- Fariba Khodagholi
- Institute of Biochemistry and Biophysics, The University of Tehran, P.O. Box 13145-1384, Tehran, Iran
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24
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Sheehy PM, Ramstad T. Determination of the molecular complexation constant between alprostadil and alpha-cyclodextrin by conductometry: implications for a freeze-dried formulation. J Pharm Biomed Anal 2005; 39:877-85. [PMID: 16126357 DOI: 10.1016/j.jpba.2005.03.046] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2004] [Revised: 03/24/2005] [Accepted: 03/29/2005] [Indexed: 11/27/2022]
Abstract
The binding constant between alprostadil (PGE1) and alpha-cyclodextrin (alpha-CD) was determined at four temperatures using conductance measurements. Alpha-cyclodextrin is an excipient material in Caverject dual chamber syringe (DCS) that was added to enhance stability. The binding constant was used to calculate the amount of PGE1 free upon reconstitution and injection, since only the free drug is clinically active. The conductivity measurement is based on a decrease in specific conductance as alprostadil is titrated with alpha-CD. The change in conductivity was plotted versus free ligand concentration (alpha-CD) to generate a binding curve. As the value of the binding constant proved to be dependent on substrate concentration, it is really a pseudo binding constant. A value of 742+/-60 M(-1) was obtained for a 0.5 mM solution of alprostadil at 27 degrees C and a value of 550+/-52 M(-1) at 37 degrees C. These results compare favorably to values previously obtained by NMR and capillary electrophoresis. Calculation of the fraction PGE1 free upon reconstitution and injection show it to approach the desired outcome of one. Hence, the amount of drug delivered by Caverject DCS is nominally equivalent to that delivered by Caverject S. Po., a predecessor product that contains no alpha-cyclodextrin.
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Affiliation(s)
- Philip M Sheehy
- Department of Chemistry, Kalamazoo College, Kalamazoo, MI, USA
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25
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Choi HS, Ooya T, Huh KM, Yui N. pH-Triggered Changes in Assembling Properties of β-Cyclodextrin-Conjugated Poly(ε-lysine) Complexes. Biomacromolecules 2005; 6:1200-4. [PMID: 15877334 DOI: 10.1021/bm0400729] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hak Soo Choi
- School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Tatsunokuchi, Ishikawa 923-1292, Japan
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26
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Wangsakan A, Chinachoti P, McClements DJ. Effect of surfactant type on surfactant-maltodextrin interactions: isothermal titration calorimetry, surface tensiometry, and ultrasonic velocimetry study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:3913-9. [PMID: 15969379 DOI: 10.1021/la0361619] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Isothermal titration calorimetry (ITC), surface tensiometry, and ultrasonic velocimetry were used to characterize surfactant-maltodextrin interactions in buffer solutions (pH 7.0, 10 mM NaCl, 20 mM Trizma base, 30.0 degrees C). Experiments were carried out using three surfactants with similar nonpolar tail groups (C12) but different charged headgroups: anionic (sodium dodecyl sulfate, SDS), cationic (dodecyl trimethylammonium bromide, DTAB), and nonionic (polyoxyethylene 23 lauryl ether, Brij35). All three surfactants bound to maltodextrin, with the binding characteristics depending on whether the surfactant headgroup was ionic or nonionic. The amounts of surfactant bound to 0.5% w/v maltodextrin (DE 5) at saturation were < 0.3 mM Brij35, approximately 1-1.6 mM SDS, and approximately 1.5 mM DTAB. ITC measurements indicated that surfactant binding to maltodextrin was exothermic. Surface tension measurements indicated that the DTAB-maltodextrin complex was more surface active than DTAB alone but that SDS- and Brij35- maltodextrin complexes were less surface active than the surfactants alone.
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Affiliation(s)
- Apiradee Wangsakan
- Biopolymers and Colloids Research Group, Department of Food Science, University of Massachusetts, Amherst, Massachusetts 01003, USA
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27
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García-Río L, Leis JR, Mejuto JC, Navarro-Vázquez A, Pérez-Juste J, Rodriguez-Dafonte P. Basic hydrolysis of crystal violet in beta-cyclodextrin/surfactant mixed systems. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:606-13. [PMID: 15773082 DOI: 10.1021/la035477d] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The basic hydrolysis of crystal violet (CV) in mixed systems consisting of beta-cyclodextrin (beta-CD) and a micelle-forming surfactant, cetyltrimethylammonium chloride (CTACl), has been studied. beta-CD was found to catalyze the basic hydrolysis of CV through the interaction of its hydroxyl group, in its deprotonated form, with the carbocation in the complexed substrate. The addition of small amounts of CTACl, with [CTACl] below the critical micelle concentration, to beta-CD solutions does not have an effect upon the observed rate constant for the basic hydrolysis of CV. This behavior is different from that observed for the alkaline hydrolysis of N-methyl-N-nitroso-p-toluenesulfonamide and nitrophenyl acetates in mixed beta-CD/cationic surfactant systems. The proposed mechanism allows us to explain the experimental results on the basis of the high percentage of uncomplexed beta-CD in equilibrium with the micellar system, the low CV concentration, and the high value for the binding constant of CV by beta-CD.
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Affiliation(s)
- L García-Río
- Departamento de Química Física, Facultad de Químicia, Universidad de Santiago de Compostela, Santiago de Compostela, Spain
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28
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Nicolle GM, Merbach AE. Destruction of perfluoroalkyl surfactant aggregates by β-cyclodextrin. Chem Commun (Camb) 2004:854-5. [PMID: 15045097 DOI: 10.1039/b315681h] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A water 1H NMRD and 19F NMR spectroscopy study has proved, for the first time, that perfluoroalkyl surfactant micelles can be completely destroyed upon addition of beta-cyclodextrin to form successively 1:1 and 2:1 (beta-CD:R(F)) inclusion complexes.
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Affiliation(s)
- Gaëlle M Nicolle
- Laboratory of Inorganic and Bioinorganic Chemistry, Swiss Federal Institute of Technology EPFL-BCH, CH-1015 Lausanne, Switzerland
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29
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30
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Jiao H, Goh SH, Valiyaveettil S. Inclusion Complexes of Poly(4-vinylpyridine)−Dodecylbenezenesulfonic Acid Complex and Cyclodextrins. Macromolecules 2002. [DOI: 10.1021/ma0201072] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hua Jiao
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - S. H. Goh
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - S. Valiyaveettil
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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31
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Lin CE, Huang HC, Chen HW. A capillary electrophoresis study on the influence of beta-cyclodextrin on the critical micelle concentration of sodium dodecyl sulfate. J Chromatogr A 2001; 917:297-310. [PMID: 11403482 DOI: 10.1016/s0021-9673(01)00636-7] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The influence of beta-cyclodextrin (beta-CD) on the critical micelle concentration (CMC) of sodium dodecyl sulfate (SDS) was investigated by capillary electrophoresis using anionic chlorophenols as probe molecules at pH 7.0. The variations of the electrophoretic mobility of probe molecules as a function of surfactant concentration in both premicellar and micellar regions in the absence and presence of beta-CD was analyzed. The results indicate that, as a consequence of a strong inclusion complexation between beta-CD and SDS, the encapsulation of beta-CD with probe molecules is greatly diminished, or even vanished, in the presence of SDS. The complexes formed between beta-CD and SDS monomers exist predominantly in the form of a 1:1 stoichiometry, while the complexes with a 2:1 stoichiometry reported previously in the literature as a minor component may exist by less than 10%. The elevation of the CMC value of SDS depends not only on the concentration of beta-CD in the buffer electrolyte but also on methanol content in the sample solution. The binding constants of probe molecules to beta-CD, to surfactant molecules, and to the complexes formed between beta-CD and SDS are reported.
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Affiliation(s)
- C E Lin
- Department of Chemistry, National Taiwan University, Taipei
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32
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García-Ruiz C, Martín-Biosca Y, Crego AL, Marina ML. Rapid enantiomeric separation of polychlorinated biphenyls by electrokinetic chromatography using mixtures of neutral and charged cyclodextrin derivatives. J Chromatogr A 2001; 910:157-64. [PMID: 11263569 DOI: 10.1016/s0021-9673(00)01176-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Electrokinetic chromatography with cyclodextrin derivatives (CD-EKC) was used to achieve the rapid enantiomeric separation of chiral polychlorinated biphenyls (PCBs). Thirteen of the 19 chiral PCBs stable at room temperature were individually separated into their two enantiomers by using 2-morpholinoethanesulfonic acid (MES) buffer (pH 6.5) containing carboxymethylated gamma-cyclodextrin (CM-gamma-CD) as pseudostationary phase mixed with beta-cyclodextrin (beta-CD) or permethylated beta-cyclodextrin (PM-beta-CD). Urea was also added to increase the solubility of PCBs and cyclodextrins in the aqueous separation buffer. Several experimental parameters such as the nature, concentration, and pH of the buffer, nature and concentration of the cyclodextrin derivatives used, and the addition of different additives were studied in order to improve the enantiomeric separation. In addition, the effect of some instrumental parameters such as separation temperature and applied voltage was also investigated. PCBs were enantiomerically separated in less than 12 min by using a 50 mM MES buffer (pH 6.5) containing 20 mM CM-gamma-CD, 10 mM beta-CD or 20 mM PM-beta-CD, and 2 M urea at a temperature of 45 degrees C and an applied voltage of 20 kV.
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Affiliation(s)
- C García-Ruiz
- Departamento de Química Analítica, Facultad de Química, Universidad de Alcalá, Alcalá de Henares, Madrid, Spain
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33
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Fern�ndez I, Garc�a-R�o L, Herv�s P, Mejuto JC, P�rez-Juste J, Rodr�guez-Dafonte P. ?-Cyclodextrin-micelle mixed systems as a reaction �medium. Denitrosation ofN-methyl-N-nitroso-p-toluenesulfonamide. J PHYS ORG CHEM 2000. [DOI: 10.1002/1099-1395(200010)13:10<664::aid-poc264>3.0.co;2-u] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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34
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Topchieva I, Karezin K. Self-Assembled Supramolecular Micellar Structures Based on Non-ionic Surfactants and Cyclodextrins. J Colloid Interface Sci 1999; 213:29-35. [PMID: 10191003 DOI: 10.1006/jcis.1998.6065] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The complexation between non-ionic polyethylene oxide (PEO)-based surfactants (Triton X-45, Triton X-100, polyethylene glycol-1000-monostearate, and Brij 35) and cyclodextrins is studied. It is shown that the addition of surfactant solutions to the aqueous solution of alpha, beta-, and gamma-cyclodextrins affords poorly soluble crystalline precipitates. Parameters of crystalline structure and the composition of complexes are analogues to those obtained on the basis of polyethylene oxide. Using a method of surface tension it is shown that cyclodextrins favor the increase of the value of critical micelle concentration (CMC) of surfactants. The dependence of CMC from the molar ratio cyclodextrin/surfactant permits us to determine the composition of inclusion complexes in solution. For Triton X-100 and polyethylene glycol-1000-monostearate values of stoichiometric composition of complexes in solution and in condensed phase agree well. It is shown that in the presence of beta-cyclodextrin the destruction of micelles based on Triton X-100 occurs. UV-spectroscopy is used for the investigation of the microenvironment of a phenyl group in inclusion complexes based on alpha- and beta-cyclodextrins. The interaction of gamma-cyclodextrin with PEO surfactants results in the formation of novel double-tailed surfactants. The values of CMC registered in solutions of these complexes is lower than the corresponding value of Triton X-100 and polyethylene glycol-1000-monostearate. The stoichiometric composition of complexes in solution is established from the dependence of CMC versus the gamma-cyclodextrin/surfactant ratio. The composition of the complexes in solution and condensed phase agree well. The interaction of alpha- and gamma-cyclodextrins with Brij 35 results in the formation of nonstoichiometric complexes. The investigation of the dependences of CMC of modified surfactants from temperature shows that these supramolecular structures exist at high temperatures. Copyright 1999 Academic Press.
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Affiliation(s)
- I Topchieva
- Department of Chemistry, Lomonosov State University, Moscow, Lenin Hills, 119899, Russia
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35
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Wilson LD, Verrall RE. A 1H NMR study of cyclodextrin - hydrocarbon surfactant inclusion complexes in aqueous solutions. CAN J CHEM 1998. [DOI: 10.1139/v97-208] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A 1H NMR chemical shift ( delta ) study of a homologous series of hydrocarbon (hc) (CxH2x + 1CO2Na, x = 5, 7, 9, 11, 13) surfactants (S) has been carried out in water and in binary solvent (D2O + cyclodextrin (CD)) systems at 22°C. Complementary 1H NMR chemical shift ( delta ) data of the cyclodextrins in binary (D2O + S) systems containing hc surfactants have also been obtained. Complex induced shift (CIS) values for selected host or guest protons were found to increase as the alkyl chain (Cx) length of the surfactant increased. The CIS values are found to depend on the following factors: (i) the magnitude of the binding constant (Ki, i = 1:1, 2:1), (ii) the chain length of the surfactant, (iii) the mole ratio of the host to guest species, (iv) the host-guest stoichiometry, and (v) the host-guest inclusion geometry. The CIS values of the CD-S systems have been analyzed using equilibrium models in which 1:1 complexes, 1:1 plus 2:1 complexes, and uncomplexed species are present. Differences in the binding affinity, stoichiometry, and inclusion geometry of the complexes formed between a given hc surfactant and the various cyclodextrins were observed.Key words: cyclodextrin, surfactant, NMR, chemical shift, complex, binding constant.
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36
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García-Río L, Leis JR, Mejuto JC, Pérez-Juste J. Investigation of Micellar Media Containing β-Cyclodextrins by Means of Reaction Kinetics: Basic Hydrolysis of N-Methyl-N-nitroso-p-toluenesulfonamide. J Phys Chem B 1997. [DOI: 10.1021/jp970862v] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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37
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Benito I, Saz J, Marina M, Jime´nez-Barbero J, Gonza´lez M, Diez-Masa J. Micellar electrokinetic capillary chromatographic separation of polychlorinated biphenyl congeners. J Chromatogr A 1997. [DOI: 10.1016/s0021-9673(97)00217-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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38
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Conductivity studies of the molecular encapsulation of sodium perfluoroctanoate by?-cyclodextrin derivatives. ACTA ACUST UNITED AC 1996. [DOI: 10.1007/bf01133381] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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39
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Pe�a L, Junquera E, Aicart E. Ultrasonic study of the molecular encapsulation and the micellization processes of dodecylethyldimethylammonium bromide-water solutions in the presence of ?-cyclodextrin or 2,6-di-o-methyl-?-cyclodextrin. J SOLUTION CHEM 1995. [DOI: 10.1007/bf00973523] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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40
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Druliner J, Wasserman E. Synthesis and characterization of cyclodextrin/perfluoroalkane inclusion compounds. J Fluor Chem 1995. [DOI: 10.1016/0022-1139(94)03179-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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41
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Ortona O, Paduano L, Costantino L, Vitagliano V. Physico - chemical characterization of some surfactants in aqueous solution and their interaction with α- cyclodextrin. J Mol Liq 1995. [DOI: 10.1016/0167-7322(94)00791-t] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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42
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Thermodynamic properties of water-β-cyclodextrin-dodecylsurfactant ternary systems. J SOLUTION CHEM 1995. [DOI: 10.1007/bf00972835] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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43
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Chasseray X, Lo SM, Lemordant D. Complexation of (l)-alanine-?-naphthylamide hydrobromide with methyl-?-cyclodextrin: An ultrafiltration study. J INCL PHENOM MACRO 1995. [DOI: 10.1007/bf00707890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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44
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Wenz G. Cyclodextrine als Bausteine supramolekularer Strukturen und Funktionseinheiten. Angew Chem Int Ed Engl 1994. [DOI: 10.1002/ange.19941060804] [Citation(s) in RCA: 159] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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45
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Czapkiewicz J, Tutaj B. Surface tension studies on the complexation of dodecylpyridinium chloride by?-cyclodextrin in aqueous electrolyte solutions. ACTA ACUST UNITED AC 1993. [DOI: 10.1007/bf00708717] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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46
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Funasaki N, Yodo H, Hada S, Neya S. Stoichiometries and Equilibrium Constants of Cyclodextrin-Surfactant Complexations. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1992. [DOI: 10.1246/bcsj.65.1323] [Citation(s) in RCA: 99] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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