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Moreira D, Regev O, Basílio N, Marques EF. Light and pH responsive catanionic vesicles based on a chalcone/flavylium photoswitch for smart drug delivery: From molecular design to the controlled release of doxorubicin. J Colloid Interface Sci 2023; 650:2024-2034. [PMID: 37536006 DOI: 10.1016/j.jcis.2023.07.129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 07/08/2023] [Accepted: 07/20/2023] [Indexed: 08/05/2023]
Abstract
Spatially and temporally localized delivery is a promising strategy to circumvent adverse effects of traditional drug therapy such as drug toxicity and prolonged treatments. Stimuli-responsive colloidal nanocarriers can be crucial to attain such goals. Here, we develop a delivery system based on dual light and pH responsive vesicles having a cationic bis-quat gemini surfactant, 12-2-12, and a negatively charged amphiphilic chalcone, C4SCh. The premise is to exploit the chalcone/flavylium interconversion to elicit a morphological change of the vesicles leading to the controlled release of an encapsulated drug. First, the phase behavior of the catanionic system is studied and the desirable composition yielding stable unilamellar vesicles identified and selected for further studies. The solutions containing vesicles (Dh ≈ 200 nm, ζ-potential ≈ 80 mV) are in-depth characterized by light microscopy, cryo-transmission electron microscopy (cryo-TEM), dynamic light scattering (DLS) and surface tension measurements. Upon subjecting the vesicles to UV irradiation (λ = 365 nm) at near neutral pH (≈ 6.0), no morphological effects are observed, yet when irradiation is coupled with pH = 3.0, the majority of the vesicles are disrupted into bilayer fragments. The anticancer drug doxorubicin (DOX) is successfully entrapped in the non-irradiated vesicles, yielding an encapsulation efficiency of ≈ 25% and a loading capacity of ≈ 3%. The release profile of the drug-loaded vesicles is then studied in vitro in four conditions: i) no stimuli (pH = 6.0); ii) irradiation, pH = 6.0; iii) no irradiation and adjusted pH = 3.0; iv) irradiation and adjusted pH = 3.0 Crucially, irradiation at pH = 3.0 leads to a sustained release of DOX to ca. 80% (within 4 h), whereas cases i) and ii) lead to only ≈ 25 % release and case iii) to 50% release but precipitation of the vesicles. Thus, our initial hypothesis is confirmed: we present a proof of concept delivery system where light and pH act as inputs of an AND logic gate mechanism for the controlled release of a relevant biomedical drug (output). This may prove useful if the irradiated nanocarriers meet acidified physiological environments such as tumors sites, endosomes or lysosomes.
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Affiliation(s)
- Dmitriy Moreira
- CIQUP, IMS (Institute of Molecular Sciences), Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal; LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Oren Regev
- Department of Chemical Engineering and (d)Ilse Katz Institute for Nanotechnology, Ben-Gurion University of the Negev, 84105 Beer-Sheva, Israel
| | - Nuno Basílio
- LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
| | - Eduardo F Marques
- CIQUP, IMS (Institute of Molecular Sciences), Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal.
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Akamatsu M. Inner and Interfacial Environmental Nanoarchitectonics of Supramolecular Assemblies Formed by Amphiphiles: from Emergence to Application. J Oleo Sci 2023; 72:105-116. [PMID: 36740247 DOI: 10.5650/jos.ess22364] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The inner and interfacial environments of self-assemblies provide fascinating nano-space for selective and efficient chemical reactions and processes. In biological systems, various chemical reactions, molecular recognition, and transport occur precisely and selectively by virtue of effective molecular interactions on biological membranes and proteins. Considering these advantages and the concept of nanoarchitectonics, we demonstrated that the photochromism of a lophine dimer was accelerated by using confined nano-spaces formed by surfactant micelles. The photoresponsive micelles were used for the rapid controlled release of a model drug upon ultraviolet light irradiation. Furthermore, selective ion recognition inside the self-assembled molecular films at the interfaces was investigated. The anion-π interaction between the anion and an electron-deficient aromatic ring was evaluated on a solid substrate modified with a naphthalenediimide (NDI) analog. Force curve measurements afforded a quantitative analysis of anion-π interactions on the NDI film. The strength of anion-π interactions is regulated by the electric fields on the electrode. An optical probe was developed to visualize the distribution of Cs ions in the soil, plant bodies, and aqueous media using an optode system. Advances in the development of molecular functional systems are expected based not only on molecular structures but also on the spaces and environments produced by them.
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Affiliation(s)
- Masaaki Akamatsu
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science.,Research Institute for Science and Technology, Tokyo University of Science
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3
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Probing plausible role of anionic surfactants in inducing structural alternations in HEWL with Fe-containing metallo-catanionic aggregates. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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4
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Butler CSG, Giles LW, Sokolova AV, de Campo L, Tabor RF, Tuck KL. Structure-Performance Relationships for Tail Substituted Zwitterionic Betaine-Azobenzene Surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:7522-7534. [PMID: 35678153 DOI: 10.1021/acs.langmuir.2c00523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Azobenzene-containing surfactants (azo-surfactants) have garnered significant attention for their use in generating photoresponsive foams, interfaces, and colloidal systems. The photoresponsive behavior of azo-surfactants is driven by the conformational and electronic changes that occur when the azobenzene chromophore undergoes light-induced trans ⇌ cis isomerization. Effective design of surfactants and targeting of their properties requires a robust understanding of how the azobenzene functionality interacts with surfactant structure and influences overall surfactant behavior. Herein, a library of tail substituted azo-surfactants were synthesized and studied to better understand how surfactant structure can be tailored to exploit the azobenzene photoswitch. This work shows that tail group structure (length and branching) has a profound influence on the critical micelle concentration of azo-surfactants and their properties once adsorbed to an air-water interface. Neutron scattering studies revealed the unique role that intermolecular π-π azobenzene interactions have on the self-assembly of azo-surfactants, and how the influence of these interactions can be tuned using tail group structure to target specific aqueous aggregate morphologies.
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Affiliation(s)
- Calum S G Butler
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Luke W Giles
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Anna V Sokolova
- Australian Centre for Neutron Scattering, ANSTO, Lucas Heights, New South Wales 2234, Australia
| | - Liliana de Campo
- Australian Centre for Neutron Scattering, ANSTO, Lucas Heights, New South Wales 2234, Australia
| | - Rico F Tabor
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Kellie L Tuck
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
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5
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Oh EJ, Park DG, Lim YS, Sik Jin K, Lee HY. Structural transition of reverse cylindrical micelles to reverse vesicles by mixtures of lecithin and inorganic salts. J Colloid Interface Sci 2022; 615:768-777. [PMID: 35176543 DOI: 10.1016/j.jcis.2022.02.015] [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: 12/06/2021] [Revised: 02/03/2022] [Accepted: 02/04/2022] [Indexed: 10/19/2022]
Abstract
HYPOTHESIS The transformation from reverse micelles to reverse vesicles is influenced by electrostatic interactions between lecithin headgroups and inorganic salts. The electrostatic interactions are expected to influence molecular geometry of lecithin, resulting in a reduction in critical packing parameter (p). Hence, it should be possible to drive structural transitions of reverse self-assembled structures by addition of inorganic salts to lecithin solutions. EXPERIMENTS Structural transitions of reverse micelles and reverse vesicles were formulated including lecithin and inorganic salts as a function of concentration in cyclohexane. A systematic study was performed using inorganic salts with the different valences of the cations such as Li+, Ca2+, and La3+. To probe the nanodomain structures from the lecithin/salt mixtures, small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) were used. FINDINGS Adding salts to lecithin solutions induced the systematic transformation of reverse self-assembled structures from reverse spherical micelles to reverse cylindrical micelles and finally to reverse vesicles. The transformation was also correlated with interactions between lecithin headgroups and salts, that is, Li+ < Ca2+ < La3+. In addition, a water-soluble dye such as rhodamine B (RB) can be readily encapsulated into reverse micelles and vesicles, indicating that they are potentially useful for controlled solute delivery.
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Affiliation(s)
- Eun-Ji Oh
- Department of Chemical Engineering, Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea
| | - Da-Gyun Park
- Department of Chemical Engineering, Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea
| | - Yeon-Su Lim
- Department of Chemical Engineering, Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea
| | - Kyeong Sik Jin
- Pohang Accelerator Laboratory, Pohang University of Science and Technology, 80 Jigokro-127-beongil, Nam-Gu, Pohang, Kyungbuk 37673, Republic of Korea
| | - Hee-Young Lee
- Department of Chemical Engineering, Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea.
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Park DG, Oh EJ, Chu EA, Jin KS, Cho SK, Lee HY. Effect of temperature on the reverse self-assembly of lecithin and sugar alcohol mixtures in a nonpolar solvent. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Akamatsu M, Kobayashi K, Iwase H, Sakaguchi Y, Tanaka R, Sakai K, Sakai H. Rapid controlled release by photo-irradiation using morphological changes in micelles formed by amphiphilic lophine dimers. Sci Rep 2021; 11:10754. [PMID: 34031460 PMCID: PMC8144387 DOI: 10.1038/s41598-021-90097-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Accepted: 05/05/2021] [Indexed: 01/30/2023] Open
Abstract
Photo-induced rapid control of molecular assemblies, such as micelles and vesicles, enables effective and on-demand release of drugs or active components, with applications such as drug delivery systems (DDS) and cosmetics. Thus far, no attempts to optimize the responsiveness of photoresponsive molecular assemblies have been published. We previously reported photoresponsive surfactants bearing a lophine dimer moiety that exhibit fast photochromism in confined spaces, such as inside a molecular assembly. However, rapid control of the micelle structures and solubilization capacity have not yet been demonstrated. In the present work, photo-induced morphological changes in micelles were monitored using in-situ small-angle neutron scattering (SANS) and UV/Vis absorption spectroscopy. An amphiphilic lophine dimer (3TEG-LPD) formed elliptical micelles. These were rapidly elongated by ultraviolet light irradiation, which could be reversed by dark treatment, both within 60 s. For a solution of 3TEG-LPD micelles solubilizing calcein as a model drug molecule, fluorescence and SANS measurements indicated rapid release of the incorporated calcein into the bulk solvent under UV irradiation. Building on these results, we investigated rapid controlled release via hierarchical chemical processes: photoisomerization, morphological changes in the micelles, and drug release. This rapid controlled release system allows for effective and on-demand DDS.
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Affiliation(s)
- Masaaki Akamatsu
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan.
| | - Kazuki Kobayashi
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Hiroki Iwase
- Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), 162-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan
| | - Yoshifumi Sakaguchi
- Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), 162-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan
| | - Risa Tanaka
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Kenichi Sakai
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan
- Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Hideki Sakai
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan.
- Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan.
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8
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Chen S, Costil R, Leung FK, Feringa BL. Self-Assembly of Photoresponsive Molecular Amphiphiles in Aqueous Media. Angew Chem Int Ed Engl 2021; 60:11604-11627. [PMID: 32936521 PMCID: PMC8248021 DOI: 10.1002/anie.202007693] [Citation(s) in RCA: 62] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Indexed: 12/22/2022]
Abstract
Amphiphilic molecules, comprising hydrophobic and hydrophilic moieties and the intrinsic propensity to self-assemble in aqueous environment, sustain a fascinating spectrum of structures and functions ranging from biological membranes to ordinary soap. Facing the challenge to design responsive, adaptive, and out-of-equilibrium systems in water, the incorporation of photoresponsive motifs in amphiphilic molecular structures offers ample opportunity to design supramolecular systems that enables functional responses in water in a non-invasive way using light. Here, we discuss the design of photoresponsive molecular amphiphiles, their self-assembled structures in aqueous media and at air-water interfaces, and various approaches to arrive at adaptive and dynamic functions in isotropic and anisotropic systems, including motion at the air-water interface, foam formation, reversible nanoscale assembly, and artificial muscle function. Controlling the delicate interplay of structural design, self-assembling conditions and external stimuli, these responsive amphiphiles open several avenues towards application such as soft adaptive materials, controlled delivery or soft actuators, bridging a gap between artificial and natural dynamic systems.
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Affiliation(s)
- Shaoyu Chen
- Stratingh Institute for ChemistryUniversity of GroningenNijenborgh 49747AGGroningenNetherlands
| | - Romain Costil
- Stratingh Institute for ChemistryUniversity of GroningenNijenborgh 49747AGGroningenNetherlands
| | - Franco King‐Chi Leung
- Stratingh Institute for ChemistryUniversity of GroningenNijenborgh 49747AGGroningenNetherlands
- Present address: State Key Laboratory of Chemical Biology and Drug DiscoveryDepartment of Applied Biology and Chemical TechnologyThe Hong Kong Polytechnic UniversityHong KongChina
| | - Ben L. Feringa
- Stratingh Institute for ChemistryUniversity of GroningenNijenborgh 49747AGGroningenNetherlands
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9
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Kim MG, Oh EJ, Jin KS, Chang JW, Lee HY. Effect of sugar alcohols on the reverse self-assembly of lecithin in diverse organic solvents. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115670] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Chen S, Costil R, Leung FK, Feringa BL. Self‐Assembly of Photoresponsive Molecular Amphiphiles in Aqueous Media. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202007693] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Shaoyu Chen
- Stratingh Institute for Chemistry University of Groningen Nijenborgh 4 9747AG Groningen Netherlands
| | - Romain Costil
- Stratingh Institute for Chemistry University of Groningen Nijenborgh 4 9747AG Groningen Netherlands
| | - Franco King‐Chi Leung
- Stratingh Institute for Chemistry University of Groningen Nijenborgh 4 9747AG Groningen Netherlands
- Present address: State Key Laboratory of Chemical Biology and Drug Discovery Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Hong Kong China
| | - Ben L. Feringa
- Stratingh Institute for Chemistry University of Groningen Nijenborgh 4 9747AG Groningen Netherlands
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11
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Lee CR, Lee YK, Oh EJ, Jin KS, Lee HY. Effect of aliphatic solvents on the reverse self-assembly of lecithin and calcium chloride mixtures. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113790] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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12
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Bryant SJ, Atkin R, Gradzielski M, Warr GG. Catanionic Surfactant Self-Assembly in Protic Ionic Liquids. J Phys Chem Lett 2020; 11:5926-5931. [PMID: 32628489 DOI: 10.1021/acs.jpclett.0c01608] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Mixing of cationic and anionic surfactants in water can result in pseudo-double-tailed catanionic surfactant ion pairs that form lamellar phases or vesicles that are unstable toward electrolyte addition. Here we show that despite the very high ionic strengths, catanionic surfactants counterintuitively form a wider variety of self-assembled aggregates in pure ionic liquids (ILs, pure salts in a liquid phase) than in water, including micelles, vesicles, and lyotropic phases. Self-assembled structures only form when the IL is sufficiently polar to drive self-assembly through electrostatic interactions and/or H-bond networks, but the catanionic effect is manifested only when the IL does not itself exhibit pronounced amphiphilic nanostructure. This enables the type of catanionic aggregate formed to be designed by changing the hydrogen bonds between the ions through variation of the structures of the cation and anion. These results reveal an entirely new way of controlling catanionic surfactant self-assembly under nonaqueous and high-salt conditions.
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Affiliation(s)
- Saffron J Bryant
- School of Chemistry and Sydney Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia
| | - Rob Atkin
- School of Molecular Sciences, University of Western Australia, Crawley, WA 6009, Australia
| | - Michael Gradzielski
- Institute for Chemistry, Technische Universität Berlin, Strasse des 17 Juni 124, D-10623 Berlin, Germany
| | - Gregory G Warr
- School of Chemistry and Sydney Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia
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Lee HJ, Kim HJ, Park DG, Jin KS, Chang JW, Lee HY. Mechanism for Transition of Reverse Cylindrical Micelles to Spherical Micelles Induced by Diverse Alcohols. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:8174-8183. [PMID: 32597190 DOI: 10.1021/acs.langmuir.0c01246] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Herein, the effects of various alcohols on lecithin/CaCl2 organogels are investigated. Mixtures of lecithin and CaCl2 form reverse cylindrical micelles, resulting in optically transparent organogels. The addition of various alcohols to a mixture of lecithin and CaCl2 induces a decrease in viscosity through which reverse cylindrical micelles are transformed into spherical micelles (or short cylindrical micelles). Long-hydrocarbon-chain alcohols decrease the viscosity of lecithin/CaCl2 mixtures more efficiently. Hydrogen bonding and hydrocarbon chain interactions between lecithin and alcohol play important roles in the morphological transition. More importantly, isothermal titration calorimetry was conducted to obtain thermodynamic variables such as the enthalpy, equilibrium constant, Gibbs free energy, entropy, and stoichiometry of the associated molecules observed in the transition. It was found that the transition is an entropically driven process, in which the endothermic and exothermic behaviors were observed depending on the hydrocarbon chain length in the alcohol. In addition, the enthalpy for the association of the alcohol with lecithin showed a linear relationship depending on the hydrocarbon chain length, in which the magnitude of hydrogen bonding and hydrocarbon chain interactions was obtained quantitatively. To the best of our knowledge, this is the first study reporting the thermodynamic properties of the morphological transition observed in a reverse self-assembly process.
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Affiliation(s)
- Hwa-Jin Lee
- Department of Chemical Engineering, The Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea
| | - Hyun-Jin Kim
- Department of Chemical Engineering, The Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea
| | - Da-Gyun Park
- Department of Chemical Engineering, The Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea
| | - Kyeong Sik Jin
- Pohang Accelerator Laboratory, Pohang University of Science and Technology, 80 Jigokro-127-beongil, Nam-Gu, Pohang, Kyungbuk 37673, Republic of Korea
| | - Ji Woong Chang
- Department of Chemical Engineering, The Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea
| | - Hee-Young Lee
- Department of Chemical Engineering, The Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea
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14
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Paternò GM, Colombo E, Vurro V, Lodola F, Cimò S, Sesti V, Molotokaite E, Bramini M, Ganzer L, Fazzi D, D'Andrea C, Benfenati F, Bertarelli C, Lanzani G. Membrane Environment Enables Ultrafast Isomerization of Amphiphilic Azobenzene. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:1903241. [PMID: 32328424 PMCID: PMC7175258 DOI: 10.1002/advs.201903241] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 01/24/2020] [Indexed: 05/18/2023]
Abstract
The non-covalent affinity of photoresponsive molecules to biotargets represents an attractive tool for achieving effective cell photo-stimulation. Here, an amphiphilic azobenzene that preferentially dwells within the plasma membrane is studied. In particular, its isomerization dynamics in different media is investigated. It is found that in molecular aggregates formed in water, the isomerization reaction is hindered, while radiative deactivation is favored. However, once protected by a lipid shell, the photochromic molecule reacquires its ultrafast photoisomerization capacity. This behavior is explained considering collective excited states that may form in aggregates, locking the conformational dynamics and redistributing the oscillator strength. By applying the pump probe technique in different media, an isomerization time in the order of 10 ps is identified and the deactivation in the aggregate in water is also characterized. Finally, it is demonstrated that the reversible modulation of membrane potential of HEK293 cells via illumination with visible light can be indeed related to the recovered trans→cis photoreaction in lipid membrane. These data fully account for the recently reported experiments in neurons, showing that the amphiphilic azobenzenes, once partitioned in the cell membrane, are effective light actuators for the modification of the electrical state of the membrane.
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Affiliation(s)
- Giuseppe Maria Paternò
- Center for Nano Science and TechnologyIstituto Italiano di TecnologiaVia Pascoli 70/320133MilanoItaly
| | - Elisabetta Colombo
- Center for Synaptic Neuroscience and TechnologyIstituto Italiano di TecnologiaLargo Rosanna Benzi 1016132GenovaItaly
- IRCCS Ospedale Policlinico San MartinoLargo Rosanna Benzi 1016132GenovaItaly
| | - Vito Vurro
- Center for Nano Science and TechnologyIstituto Italiano di TecnologiaVia Pascoli 70/320133MilanoItaly
- Dipartimento di FisicaPolitecnico di MilanoPiazza L. da Vinci 3220133MilanoItaly
| | - Francesco Lodola
- Center for Nano Science and TechnologyIstituto Italiano di TecnologiaVia Pascoli 70/320133MilanoItaly
| | - Simone Cimò
- Dipartimento di ChimicaMateriali e Ingegneria Chimica “Giulio Natta”Politecnico di MilanoPiazza L. da Vinci 3220133MilanoItaly
| | - Valentina Sesti
- Dipartimento di ChimicaMateriali e Ingegneria Chimica “Giulio Natta”Politecnico di MilanoPiazza L. da Vinci 3220133MilanoItaly
| | - Egle Molotokaite
- Center for Nano Science and TechnologyIstituto Italiano di TecnologiaVia Pascoli 70/320133MilanoItaly
| | - Mattia Bramini
- Center for Synaptic Neuroscience and TechnologyIstituto Italiano di TecnologiaLargo Rosanna Benzi 1016132GenovaItaly
- IRCCS Ospedale Policlinico San MartinoLargo Rosanna Benzi 1016132GenovaItaly
- Department of Applied PhysicsFaculty of SciencesUniversity of GranadaC/Fuentenueva s/n18071GranadaSpain
| | - Lucia Ganzer
- Dipartimento di FisicaPolitecnico di MilanoPiazza L. da Vinci 3220133MilanoItaly
| | - Daniele Fazzi
- Department of ChemistryInstitut für Physikalische ChemieUniversity of CologneLuxemburger Str. 116D‐50939KölnGermany
| | - Cosimo D'Andrea
- Center for Nano Science and TechnologyIstituto Italiano di TecnologiaVia Pascoli 70/320133MilanoItaly
- Dipartimento di FisicaPolitecnico di MilanoPiazza L. da Vinci 3220133MilanoItaly
| | - Fabio Benfenati
- Center for Synaptic Neuroscience and TechnologyIstituto Italiano di TecnologiaLargo Rosanna Benzi 1016132GenovaItaly
- IRCCS Ospedale Policlinico San MartinoLargo Rosanna Benzi 1016132GenovaItaly
| | - Chiara Bertarelli
- Dipartimento di ChimicaMateriali e Ingegneria Chimica “Giulio Natta”Politecnico di MilanoPiazza L. da Vinci 3220133MilanoItaly
| | - Guglielmo Lanzani
- Center for Nano Science and TechnologyIstituto Italiano di TecnologiaVia Pascoli 70/320133MilanoItaly
- Dipartimento di FisicaPolitecnico di MilanoPiazza L. da Vinci 3220133MilanoItaly
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15
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Akamatsu M, Kobayashi K, Sakai K, Sakai H. Accelerated recombination of lophyl radicals and control of the surface tension with amphiphilic lophine dimers. Chem Commun (Camb) 2019; 55:9769-9772. [PMID: 31329196 DOI: 10.1039/c9cc04579a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
We report the accelerated photoisomerization of amphiphilic lophine dimers based on the inner environments of molecular assemblies and rapid control of the interfacial properties of aqueous solution with photoirradiation. This novel photoisomerization system enables on-demand controlled release of drugs, perfumes, and other active compounds.
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Affiliation(s)
- Masaaki Akamatsu
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan.
| | - Kazuki Kobayashi
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan.
| | - Kenichi Sakai
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan. and Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Hideki Sakai
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan. and Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan
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16
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Tabor RF, McCoy TM, Hu Y, Wilkinson BL. Physicochemical and Biological Characterisation of Azobenzene-Containing Photoswitchable Surfactants. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2018. [DOI: 10.1246/bcsj.20180024] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Rico F. Tabor
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Thomas M. McCoy
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Yingxue Hu
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Brendan L. Wilkinson
- School of Science and Technology, University of New England, Armidale, New South Wales 2351, Australia
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17
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Akamatsu M, Shiina M, Shrestha RG, Sakai K, Abe M, Sakai H. Photoinduced viscosity control of lecithin-based reverse wormlike micellar systems using azobenzene derivatives. RSC Adv 2018; 8:23742-23747. [PMID: 35540289 PMCID: PMC9081822 DOI: 10.1039/c8ra04690e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 06/24/2018] [Indexed: 11/21/2022] Open
Abstract
This report describes the controlled viscosity changes of photoresponsive reverse wormlike micellar systems formed by soybean lecithin (SoyPC), d-ribose, and azobenzene derivatives in decane.
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Affiliation(s)
- Masaaki Akamatsu
- Department of Pure and Applied Chemistry
- Faculty of Science and Technology
- Tokyo University of Science
- Noda
- Japan
| | - Mayu Shiina
- Department of Pure and Applied Chemistry
- Faculty of Science and Technology
- Tokyo University of Science
- Noda
- Japan
| | - Rekha Goswami Shrestha
- Department of Pure and Applied Chemistry
- Faculty of Science and Technology
- Tokyo University of Science
- Noda
- Japan
| | - Kenichi Sakai
- Department of Pure and Applied Chemistry
- Faculty of Science and Technology
- Tokyo University of Science
- Noda
- Japan
| | - Masahiko Abe
- Research Institute for Science and Technology
- Tokyo University of Science
- Noda
- Japan
| | - Hideki Sakai
- Department of Pure and Applied Chemistry
- Faculty of Science and Technology
- Tokyo University of Science
- Noda
- Japan
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18
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19
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Geng S, Wang Y, Wang L, Kouyama T, Gotoh T, Wada S, Wang JY. A Light-Responsive Self-Assembly Formed by a Cationic Azobenzene Derivative and SDS as a Drug Delivery System. Sci Rep 2017; 7:39202. [PMID: 28051069 PMCID: PMC5209711 DOI: 10.1038/srep39202] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 11/21/2016] [Indexed: 11/23/2022] Open
Abstract
The structure of a self-assembly formed from a cationic azobenzene derivative, 4-cholesterocarbonyl-4'-(N,N,N-triethylamine butyloxyl bromide) azobenzene (CAB) and surfactant sodium dodecyl sulfate (SDS) in aqueous solution was studied by cryo-TEM and synchrotron radiation small-angle X-ray scattering (SAXS). Both unilamellar and multilamellar vesicles could be observed. CAB in vesicles were capable to undergo reversible trans-to-cis isomerization upon UV or visible light irradiation. The structural change upon UV light irradiation could be catched by SAXS, which demonstrated that the interlamellar spacing of the cis-multilamellar vesicles increased by 0.2-0.3 nm. Based on this microstructural change, the release of rhodamine B (RhB) and doxorubicin (DOX) could be triggered by UV irradiation. When incubated NIH 3T3 cells and Bel 7402 cells with DOX-loaded CAB/SDS vesicles, UV irradiation induced DOX release decreased the viability of both cell lines significantly compared with the non-irradiated cells. The in vitro experiment indicated that CAB/SDS vesicles had high efficiency to deliver loaded molecules into cells. The in vivo experiment showed that CAB/SDS vesicles not only have high drug delivery efficiency into rat retinas, but also could maintain high drug concentration for a longer time. CAB/SDS catanionic vesicles may find potential applications as a smart drug delivery system for controlled release by light.
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Affiliation(s)
- Shengyong Geng
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
- Photonics Control Technology Team, Advanced Photonics Technology Development Group, Center for Advanced Photonics, RIKEN, Wako, Saitama 351-0198, Japan
| | - Yuzhu Wang
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
| | - Liping Wang
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Tsutomu Kouyama
- Department of Physics, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
| | - Toshiaki Gotoh
- Department of Physics, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
| | - Satoshi Wada
- Photonics Control Technology Team, Advanced Photonics Technology Development Group, Center for Advanced Photonics, RIKEN, Wako, Saitama 351-0198, Japan
| | - Jin-Ye Wang
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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20
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Kim S, Bellouard C, Eastoe J, Canilho N, Rogers SE, Ihiawakrim D, Ersen O, Pasc A. Spin State As a Probe of Vesicle Self-Assembly. J Am Chem Soc 2016; 138:2552-5. [DOI: 10.1021/jacs.6b00537] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Sanghoon Kim
- SRSMC,
UMR 7565, Université de Lorraine/CNRS, F-54506 Vandoeuvre-lès-Nancy, France
| | - Christine Bellouard
- Institut
Jean Lamour, UMR 7198, Université de Lorraine/CNRS, F-54506 Vandoeuvre-lès-Nancy, France
| | - Julian Eastoe
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, U.K
| | - Nadia Canilho
- SRSMC,
UMR 7565, Université de Lorraine/CNRS, F-54506 Vandoeuvre-lès-Nancy, France
| | - Sarah E. Rogers
- Rutherford Appleton
Laboratory, ISIS Facility, Chilton, Oxfordshire OX11 0QX, U.K
| | - Dris Ihiawakrim
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 CNRS - Université de Strasbourg, 23 rue du Loess, BP 43, 67034 Strasbourg cedex 2, France
| | - Ovidiu Ersen
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 CNRS - Université de Strasbourg, 23 rue du Loess, BP 43, 67034 Strasbourg cedex 2, France
| | - Andreea Pasc
- SRSMC,
UMR 7565, Université de Lorraine/CNRS, F-54506 Vandoeuvre-lès-Nancy, France
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21
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Synergistic solubilization of polycyclic aromatic hydrocarbons by mixed micelles composed of a photoresponsive surfactant and a conventional non-ionic surfactant. Sep Purif Technol 2016. [DOI: 10.1016/j.seppur.2016.01.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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22
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Akamatsu M, FitzGerald PA, Shiina M, Misono T, Tsuchiya K, Sakai K, Abe M, Warr GG, Sakai H. Micelle Structure in a Photoresponsive Surfactant with and without Solubilized Ethylbenzene from Small-Angle Neutron Scattering. J Phys Chem B 2015; 119:5904-10. [DOI: 10.1021/acs.jpcb.5b00499] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Masaaki Akamatsu
- Department
of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-0022, Japan
| | - Paul A. FitzGerald
- School
of Chemistry, F11, The University of Sydney, New South Wales 2006, Australia
| | - Mayu Shiina
- Department
of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-0022, Japan
| | - Takeshi Misono
- Department
of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-0022, Japan
| | - Koji Tsuchiya
- Department
of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-0022, Japan
| | - Kenichi Sakai
- Department
of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-0022, Japan
| | - Masahiko Abe
- Department
of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-0022, Japan
| | - Gregory G Warr
- School
of Chemistry, F11, The University of Sydney, New South Wales 2006, Australia
| | - Hideki Sakai
- School
of Chemistry, F11, The University of Sydney, New South Wales 2006, Australia
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23
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Liu S, Zhao L, Yan Y, Huang J. One platform solid multicolour emission of terthiophene compounds controlled by mixed self-assembly. SOFT MATTER 2015; 11:2752-2757. [PMID: 25697130 DOI: 10.1039/c4sm02554g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Via the mixed self-assembling procedure, solid multicolour emission materials based on an amphiphilic terthiophene compound are obtained from a unimolecular platform. Upon controlling the concentration of the cationic surfactant dodecyltriethyl ammonium bromide (DEAB) in the precipitate-monomer equilibrium system of the terthiophene compound TTC4L, mixed self-assembly of TTC4L-DEAB results in diverse structures (including plates, spheres, and needles) with different emission colours. The multicolour emissions are triggered by the different distances between the terthiophene groups in these mixed self-assemblies. Each distance corresponds to a specific molecular state of terthiophene groups, so that emissions corresponding to the monomers, excimers, and aggregates are obtained. Upon variation of the ratio of DEAB and TTC4L, the relative fraction of emissions corresponding to the monomers, excimers, and aggregates of TTC4L changes. This approach may act as a simple method to control the stacking mode of the oligothiophene group which is anticipated to realize unimolecular-platform multicolour emissions.
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Affiliation(s)
- Shuai Liu
- Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
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24
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Tabor RF, Pottage MJ, Garvey CJ, Wilkinson BL. Light-induced structural evolution of photoswitchable carbohydrate-based surfactant micelles. Chem Commun (Camb) 2015; 51:5509-12. [DOI: 10.1039/c4cc07657e] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
We report the light-induced structural evolution of photoswitchable carbohydrate-based surfactant micelles using time-resolved small-angle neutron scattering (TR-SANS), monitoring the structural changes in micellisation in situ over time and demonstrating for the first time the course and implications of this process.
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25
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Du M, Dai C, Chen A, Wu X, Li Y, Liu Y, Li W, Zhao M. Investigation on the aggregation behavior of photo-responsive system composed of 1-hexadecyl-3-methylimidazolium bromide and 2-methoxycinnamic acid. RSC Adv 2015. [DOI: 10.1039/c5ra08164e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Mechanism of the aggregation behavior for the photo-responsive system composed of 1-hexadecyl-3-methylimidazolium bromide and 2-methoxycinnamic acid.
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Affiliation(s)
- Mingyong Du
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao
- P. R. China
| | - Caili Dai
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao
- P. R. China
| | - Ang Chen
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao
- P. R. China
| | - Xuepeng Wu
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao
- P. R. China
| | - Yuyang Li
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao
- P. R. China
| | - Yifei Liu
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao
- P. R. China
| | - Weitao Li
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao
- P. R. China
| | - Mingwei Zhao
- School of Petroleum Engineering
- China University of Petroleum (East China)
- Qingdao
- P. R. China
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26
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Tabor RF, Tan DD, Han SS, Young SA, Seeger ZLE, Pottage MJ, Garvey CJ, Wilkinson BL. Reversible pH‐ and Photocontrollable Carbohydrate‐Based Surfactants. Chemistry 2014; 20:13881-4. [DOI: 10.1002/chem.201404945] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Indexed: 12/17/2022]
Affiliation(s)
- Rico F. Tabor
- School of Chemistry, Monash University, Victoria 3800 (Australia)
| | - David D. Tan
- School of Chemical and Life Sciences, Nanyang Polytechnic, Singapore 569830 (Singapore)
| | - Sean S. Han
- School of Chemical and Life Sciences, Nanyang Polytechnic, Singapore 569830 (Singapore)
| | - Scott A. Young
- School of Chemistry, Monash University, Victoria 3800 (Australia)
| | - Zoe L. E. Seeger
- School of Chemistry, Monash University, Victoria 3800 (Australia)
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27
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Kim TH, Song C, Han YS, Jang JD, Choi MC. Spontaneous unilamellar polymer vesicles in aqueous solution. SOFT MATTER 2014; 10:484-490. [PMID: 24652418 DOI: 10.1039/c3sm52519h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A unilamellar polymeric vesicle is a self-assembled structure of a block copolymer that forms a spherical single bilayer structure with a hydrophobic interlayer and a hydrophilic surface. Due to their enhanced colloidal stability and mechanical property, controllable surface functionality, or tunable membrane thickness, polymeric vesicles are useful in nano and bio-science, providing potential applications as nanosized carriers for catalysts, drugs, and enzymes. For fabrication of a unilamellar vesicle, however, preparative procedures with a few steps are inherently required. Herein, without complicated preparative procedures, we report spontaneous unilamellar polymeric vesicles with nanometer sizes (<100 nm), which are prepared by simply mixing a triblock copolymer, Pluronic P85 (PEO26PPO40PEO26), and an organic derivative, 5-methyl salicylic acid (5mS), in aqueous solution. Depending on the 5mS concentration and the temperature, the P85-5mS mixtures presented various self-assembled nanostructures such as spherical and cylindrical micelles or vesicles, which were characterized by small angle neutron scattering and cryo-TEM, resulting in a phase diagram drawn as a function of temperature and the 5mS concentration. Interestingly the critical temperature for the micelle-to-vesicle phase transition was easily controlled by varying the 5mS concentration, i.e. it was decreased with increasing the 5mS concentration.
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Affiliation(s)
- Tae-Hwan Kim
- Neutron Science Division, Korea Atomic Energy Research Institute, 1045 Daedeok-daero, Yuseong-gu, Daejeon, 305-353, Republic of Korea.
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28
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Diguet A, Yanagisawa M, Liu YJ, Brun E, Abadie S, Rudiuk S, Baigl D. UV-induced bursting of cell-sized multicomponent lipid vesicles in a photosensitive surfactant solution. J Am Chem Soc 2012; 134:4898-904. [PMID: 22316240 PMCID: PMC3303198 DOI: 10.1021/ja211664f] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
We study the behavior of multicomponent giant unilamellar vesicles (GUVs) in the presence of AzoTAB, a photosensitive surfactant. GUVs are made of an equimolar ratio of dioleoylphosphatidylcholine (DOPC) and dipalmitoylphosphatidylcholine (DPPC) and various amounts of cholesterol (Chol), where the lipid membrane shows a phase separation into a DPPC-rich liquid-ordered (L(o)) phase and a DOPC-rich liquid-disordered (L(d)) phase. We find that UV illumination at 365 nm for 1 s induces the bursting of a significant fraction of the GUV population. The percentage of UV-induced disrupted vesicles, called bursting rate (Y(burst)), increases with an increase in [AzoTAB] and depends on [Chol] in a non-monotonous manner. Y(burst) decreases when [Chol] increases from 0 to 10 mol % and then increases with a further increase in [Chol], which can be correlated with the phase composition of the membrane. We show that Y(burst) increases with the appearance of solid domains ([Chol] = 0) or with an increase in area fraction of L(o) phase (with increasing [Chol] ≥ 10 mol %). Under our conditions (UV illumination at 365 nm for 1 s), maximal bursting efficiency (Y(burst) = 53%) is obtained for [AzoTAB] = 1 mM and [Chol] = 40 mol %. Finally, by restricting the illumination area, we demonstrate the first selective UV-induced bursting of individual target GUVs. These results show a new method to probe biomembrane mechanical properties using light as well as pave the way for novel strategies of light-induced drug delivery.
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Affiliation(s)
- Antoine Diguet
- Department of Chemistry, Ecole Normale Supérieure, 24 rue Lhomond, 75005 Paris, France
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29
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R. Newkome G, Patri A, N. Moorefield C. Dendronized Bi-2-quinoline Ligands and Their Metal Complexes: Dendron Synthesis and Metalloassembly. HETEROCYCLES 2012. [DOI: 10.3987/com-11-s(p)80] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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30
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Matsumura A, Tsuchiya K, Torigoe K, Sakai K, Sakai H, Abe M. Photochemical control of molecular assembly formation in a catanionic surfactant system. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:1610-1617. [PMID: 21244081 DOI: 10.1021/la104731w] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Photochemical control of vesicle disintegration and reformation in aqueous solution was examined using a mixture of 4-butylazobenzene-4'-(oxyethyl)trimethylammonium bromide (AZTMA) as the photoresponsive cationic surfactant and sodium dodecylbenzenesulfonate (SDBS) as the anionic surfactant. Spontaneous vesicle formation was found in a wide-ranging composition of the trans-AZTMA/SDBS system. AZTMA molecules constituting vesicles underwent reversible trans-cis photoisomerization when irradiated with ultraviolet and visible light. Transmission electron microscopy observations using the freeze-fracture technique (FF-TEM) showed that UV light irradiation caused the vesicles to disintegrate into coarse aggregates and visible light irradiation stimulated the reformation of vesicles (normal control). A detailed investigation of the phase state and the effects of UV and visible light irradiation on the AZTMA/SDBS system with the use of electroconductivity, dynamic/static light scattering, and surface tension measurements and FF-TEM observations revealed that in the AZTMA-rich composition (AZTMA/SDBS 9:1) a micellar solution before light irradiation became a vesicular solution after UV light irradiation and visible light irradiation allowed the return to a micellar solution (reverse control). Thus, we could photochemically control the disintegration (normal control) and reformation (reverse control) of vesicles in the same system.
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Affiliation(s)
- Atsutoshi Matsumura
- Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
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31
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Willerich I, Gröhn F. Photoswitchable nanoassemblies by electrostatic self-assembly. Angew Chem Int Ed Engl 2011; 49:8104-8. [PMID: 20799308 DOI: 10.1002/anie.201003271] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Immanuel Willerich
- Department of Chemistry and Pharmacy, Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany
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32
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Bianco CL, Schneider CS, Santonicola M, Lenhoff AM, Kaler EW. Effects of urea on the microstructure and phase behavior of aqueous solutions of polyoxyethylene surfactants. Ind Eng Chem Res 2010; 50:85-96. [PMID: 21359094 DOI: 10.1021/ie101011v] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Membrane proteins are made soluble in aqueous buffers by the addition of various surfactants (detergents) to form so-called protein-detergent complexes (PDCs). Properties of membrane proteins are commonly assessed by unfolding the protein in the presence of surfactant in a buffer solution by adding urea. The stability of the protein under these conditions is then monitored by biophysical methods such as fluorescence or circular dichroism spectroscopy. Often overlooked in these experiments is the effect of urea on the phase behavior and micellar microstructure of the different surfactants used to form the PDCs. Here the effect of urea on five polyoxyethylene surfactants - n-octylytetraoxyethylene (C(8)E(4)), n-octylpentaoxyethylene (C(8)E(5)), n-decylhexaoxyethylene (C(10)E(6)), n-dodecylhexaoxyethylene (C(12)E(6)) and n-dodecyloctaoxylethylene (C(12)E(8)) - is explored. The presence of urea increases the critical micelle concentration (CMC) of all surfactants studied, indicating that the concentration of both the surfactant and urea should be considered in membrane protein folding studies. The cloud point temperature of all surfactants studied also increases with increasing urea concentration. Small-angle neutron scattering shows a urea-induced transition from an elongated to a globular shape for micelles of C(8)E(4) and C(12)E(6). In contrast, C(8)E(5) and C(12)E(8) form more globular micelles at room temperature and the micelles remain globular as the urea concentration is increased. The effects of increasing urea concentration on micelle structure are analogous to those of decreasing the temperature. The large changes in micelle structure observed here could also affect membrane protein unfolding studies by changing the structure of the PDC.
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Affiliation(s)
- Carolina L Bianco
- Department of Chemical Engineering, University of Delaware, Newark, DE 19716
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33
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Willerich I, Gröhn F. Photoschaltbare Nanostrukturen durch elektrostatische Selbstorganisation. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201003271] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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34
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Affiliation(s)
- George R. Newkome
- Departments of Polymer Science and Chemistry, University of Akron, Akron, Ohio 44325-4717, and Department of Chemistry, Hiram College, Hiram, Ohio 44234
| | - Carol Shreiner
- Departments of Polymer Science and Chemistry, University of Akron, Akron, Ohio 44325-4717, and Department of Chemistry, Hiram College, Hiram, Ohio 44234
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35
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Maiti K, Mitra D, Mitra RN, Panda AK, Das PK, Rakshit AK, Moulik SP. Self-Aggregation of Synthesized Novel Bolaforms and Their Mixtures with Sodium Dodecyl Sulfate (SDS) and Cetyltrimethylammonium Bromide (CTAB) in Aqueous Medium. J Phys Chem B 2010; 114:7499-508. [DOI: 10.1021/jp910527q] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kajari Maiti
- Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata 700 032, India, Department of Biological Chemistry, Indian Association for Cultivation of Science, Kolkata 700 032, India, Department of Chemistry, University of North Bengal, Darjeeling 734 013, India, and Department of Natural Sciences, West Bengal University of Technology, Kolkata 700 064, India
| | - Debolina Mitra
- Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata 700 032, India, Department of Biological Chemistry, Indian Association for Cultivation of Science, Kolkata 700 032, India, Department of Chemistry, University of North Bengal, Darjeeling 734 013, India, and Department of Natural Sciences, West Bengal University of Technology, Kolkata 700 064, India
| | - Rajendra N. Mitra
- Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata 700 032, India, Department of Biological Chemistry, Indian Association for Cultivation of Science, Kolkata 700 032, India, Department of Chemistry, University of North Bengal, Darjeeling 734 013, India, and Department of Natural Sciences, West Bengal University of Technology, Kolkata 700 064, India
| | - Amiya K. Panda
- Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata 700 032, India, Department of Biological Chemistry, Indian Association for Cultivation of Science, Kolkata 700 032, India, Department of Chemistry, University of North Bengal, Darjeeling 734 013, India, and Department of Natural Sciences, West Bengal University of Technology, Kolkata 700 064, India
| | - Prasanta K. Das
- Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata 700 032, India, Department of Biological Chemistry, Indian Association for Cultivation of Science, Kolkata 700 032, India, Department of Chemistry, University of North Bengal, Darjeeling 734 013, India, and Department of Natural Sciences, West Bengal University of Technology, Kolkata 700 064, India
| | - Animesh K. Rakshit
- Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata 700 032, India, Department of Biological Chemistry, Indian Association for Cultivation of Science, Kolkata 700 032, India, Department of Chemistry, University of North Bengal, Darjeeling 734 013, India, and Department of Natural Sciences, West Bengal University of Technology, Kolkata 700 064, India
| | - Satya P. Moulik
- Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata 700 032, India, Department of Biological Chemistry, Indian Association for Cultivation of Science, Kolkata 700 032, India, Department of Chemistry, University of North Bengal, Darjeeling 734 013, India, and Department of Natural Sciences, West Bengal University of Technology, Kolkata 700 064, India
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Song B, Zhao J. Orientation of the Azobenzene Spacer of Carboxylic Methyl Ester Gemini Surfactants in Langmuir Monolayer. CHINESE J CHEM 2010. [DOI: 10.1002/cjoc.201090052] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Lee CT, Smith KA, Hatton TA. Small-angle neutron scattering study of the micellization of photosensitive surfactants in solution and in the presence of a hydrophobically modified polyelectrolyte. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:13784-13794. [PMID: 19715336 DOI: 10.1021/la9016239] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The self-assembly behavior of a light-sensitive azobenzene-based surfactant, both in pure surfactant solutions and in the presence of a hydrophobically modified, water-soluble polymer, has been investigated using small-angle neutron scattering (SANS), light scattering, and UV-vis absorption techniques. The surfactant undergoes reversible photoisomerization upon exposure to the appropriate wavelength of light, with the trans form predominant under visible light being more hydrophobic than the cis isomer under UV-light. As a result, the trans form exhibits a lower critical micelle concentration than does the cis form of the surfactant, allowing photoreversible control of micelle formation. The SANS measurements reveal that micelle formation in pure surfactant solutions with the trans surfactant proceeds as commonly observed in traditional alkyl-based surfactants. Fully developed micelles were observed with aggregation numbers >50, whereas the micelle shapes are consistent with triaxial ellipsoids with axes R(a), R(b), and R(c) approximately equal to 20, 30, and 30-35 A, respectively. In contrast, with the surfactant in the cis conformation disk-shaped premicellar aggregates were observed at low surfactant concentrations with aggregation numbers <10, thicknesses of 6-10 A, and radii of 10-20 A whereas elevated cis-azoTAB concentrations eventually gave rise to fully developed micelles akin to the trans micelles. This stark difference between the self-assembly behavior of the two azobenzene isomers is ascribed to the different geometries of the surfactant in the trans (planar) and cis (bent) conformation. In the presence of the hydrophobically modified polymer, however, both surfactant isomers resulted in well-developed micelles at the respective critical aggregation concentrations (cac's), presumably because of the effect of the dodecyl side chains attached to the polymer on the conformation of the mixed alkyl-azobenzene micelles.
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Affiliation(s)
- C Ted Lee
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
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Synthesis and self-assembly of new light-sensitive Gemini surfactants containing an azobenzene group. Colloids Surf A Physicochem Eng Asp 2009. [DOI: 10.1016/j.colsurfa.2009.09.044] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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39
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Liu X, Abbott NL. Spatial and temporal control of surfactant systems. J Colloid Interface Sci 2009; 339:1-18. [PMID: 19665723 PMCID: PMC3253364 DOI: 10.1016/j.jcis.2009.07.006] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2009] [Revised: 06/30/2009] [Accepted: 07/01/2009] [Indexed: 01/08/2023]
Abstract
This paper reviews some recent progress on approaches leading to spatial and temporal control of surfactant systems. The approaches revolve around the use of redox-active and light-sensitive surfactants. Perspectives are presented on experiments that have realized approaches for active control of interfacial properties of aqueous surfactant systems, reversible control of microstructures and nanostructures formed within bulk solutions, and in situ manipulation of the interactions of surfactants with polymers, DNA and proteins. A particular focus of this review is devoted to studies of amphiphiles that contain the redox-active group ferrocene - reversible control of the oxidation state of ferrocene leads to changes in the charge/hydrophobicity of these amphiphiles, resulting in substantial changes in their self-assembly. Light-sensitive surfactants containing azobenzene, which undergo changes in shape/polarity upon illumination with light, are a second focus of this review. Examples of both redox-active and light-sensitive surfactants that lead to large (>20mN/m) and spatially localized ( approximately mm) changes in surface tensions on a time scale of seconds are presented. Systems that permit reversible transformations of bulk solution nanostructures - such as micelle-to-vesicle transitions or monomer-to-micelle transitions - are also described. The broad potential utility of these emerging classes of amphiphiles are illustrated by the ability to drive changes in functional properties of surfactant systems, such as rheological properties and reversible solubilization of oils, as well as the ability to control interactions of surfactants with biomolecules to modulate their transport into cells.
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Affiliation(s)
- Xiaoyang Liu
- Department of Chemical and Biological Engineering, University of Wisconsin, 1415 Engineering Drive, Madison, WI 53705-1691
| | - Nicholas L. Abbott
- Department of Chemical and Biological Engineering, University of Wisconsin, 1415 Engineering Drive, Madison, WI 53705-1691
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40
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Yan Y, Lu T, Huang J. Recent advances in the mixed systems of bolaamphiphiles and oppositely charged conventional surfactants. J Colloid Interface Sci 2009; 337:1-10. [DOI: 10.1016/j.jcis.2009.04.082] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2008] [Revised: 04/24/2009] [Accepted: 04/27/2009] [Indexed: 11/24/2022]
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41
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Liu YC, Le Ny ALM, Schmidt J, Talmon Y, Chmelka BF, Lee CT. Photo-assisted gene delivery using light-responsive catanionic vesicles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:5713-5724. [PMID: 19435291 DOI: 10.1021/la803588d] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Photoresponsive catanionic vesicles have been developed as a novel gene delivery vector combining enhanced cellular uptake with phototriggered release of vesicle payload following entry into cells. Vesicles with diameters ranging from 50 to 200 nm [measured using cryo-transmission electron microscopy (TEM) and light-scattering techniques] form spontaneously, following mixing of positively charged azobenzene-containing surfactant and negatively charged alkyl surfactant species. Fluorescent probe measurements showed that the catanionic vesicles at a cation/anion ratio of 7:3 formed at surfactant concentrations as low as 10 microM of the azobenzene surfactant under visible light (with the azobenzene surfactant species principally in the trans configuration), while 50-60 microM of the azobenzene surfactant is required to form vesicles under UV illumination (with the azobenzene surfactant species principally in the cis configuration). At intermediate surfactant concentrations (ca. 15-45 microM) under visible light conditions, transport of DNA-vesicle complexes occurred past the cell membrane of murine fibroblast NIH 3T3 cells through endocytosis. Subsequent UV illumination induced rupture of the vesicles and release of uncomplexed DNA into the cell interiors, where it was capable of passing through the nuclear membrane and thereby contributing to enhanced expression. Single-molecule fluorescent images of T4-DNA demonstrated that the formation of vesicles with a net positive charge led to compaction of DNA molecules via complex formation within a few seconds, while UV-induced disruption of the vesicle-DNA complexes led to DNA re-expansion to the elongated-coil state, also within a few seconds. Transfection experiments with eGFP DNA revealed that photoresponsive catanionic vesicles are more effectively taken up by cells compared to otherwise identical alkyl (i.e., nonazobenzene-containing and thus nonlight-responsive) catanionic vesicles, presumably because of pi-pi stacking interactions that enhance bilayer rigidity in the photoresponsive vesicles. Subsequent UV illumination following endocytosis leads to further dramatic enhancements in the transfection efficiencies, demonstrating that vector unpacking and release of DNA from the carrier complex can be the limiting step in the overall process of gene delivery.
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Affiliation(s)
- Yu-Chuan Liu
- Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089, USA
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Nilsson M, Valente AJM, Olofsson G, Söderman O, Bonini M. Thermodynamic and Kinetic Characterization of Host−Guest Association between Bolaform Surfactants and α- and β-Cyclodextrins. J Phys Chem B 2008; 112:11310-6. [DOI: 10.1021/jp802963x] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Markus Nilsson
- Physical Chemistry 1, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, and Department of Chemistry and CSGI, University of Florence, 50019 Florence, Italy
| | - Artur J. M. Valente
- Physical Chemistry 1, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, and Department of Chemistry and CSGI, University of Florence, 50019 Florence, Italy
| | - Gerd Olofsson
- Physical Chemistry 1, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, and Department of Chemistry and CSGI, University of Florence, 50019 Florence, Italy
| | - Olle Söderman
- Physical Chemistry 1, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, and Department of Chemistry and CSGI, University of Florence, 50019 Florence, Italy
| | - Massimo Bonini
- Physical Chemistry 1, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal, and Department of Chemistry and CSGI, University of Florence, 50019 Florence, Italy
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43
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Light-sensitive lamellar phases. J Colloid Interface Sci 2008; 322:611-6. [DOI: 10.1016/j.jcis.2008.03.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2008] [Revised: 03/02/2008] [Accepted: 03/04/2008] [Indexed: 11/20/2022]
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Abstract
Amphiphilic self-assembly has become the basis for a wide gamut of materials and commercial product applications. In many situations however, the best use of self-assembling complex fluids comes when their microstructures can be made permanent. The impetus for a static microstructure can often be such that an alternative non-aqueous media is preferable. Highlighted here is a new approach to capturing self-assembly through replacement of water in traditional complex fluids with sugars to form room temperature complex glasses. Combining solid and liquid properties at the nanoscale, complex glasses have broad potential applications in encapsulation and materials template synthesis.
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Affiliation(s)
- Carlos C Co
- Department of Chemical and Materials Engineering, University of Cincinnati, 497 Rhodes Hall, Cincinnati, OH 45221-0012, USA
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45
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Choi J, Tung SH, Wang NS, Reipa V. Small-angle neutron scattering measurement of silicon nanoparticle size. NANOTECHNOLOGY 2008; 19:085715. [PMID: 21730746 DOI: 10.1088/0957-4484/19/8/085715] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We have determined the particle size distribution profiles of octane-terminated silicon nanoparticle suspensions, produced using the sonication of electrochemically etched Si wafers. Small-angle neutron scattering data was analyzed separately in high (0.4 nm(-1)<q<3.0 nm(-1)) and low (q<0.4 nm(-1)) scattering vector ranges. Data in the high q range is consistent with the log-normal distribution of isolated spherical particles with median diameter d = 3 ± 0.2 nm. Particle sizes were also indirectly assessed from photoluminescence and optical transmission spectroscopy using the size/bandgap relation: E(g) = 3.44d(-0.5), where E(g) is in eV and d in nm. Both measurements were consistent with the particle size distribution profiles, estimated from ANS data fitting and TEM image analysis. A subpopulation of larger, irregular shape structures in the size range 10-50 nm was also indicated by neutron scattering in the low q range and HRTEM images. However, further studies are warranted to explain a relationship between the slope of scattering intensity versus scattering vector dependence in the intermediate scattering vector range (0.4 nm(-1)<q<1.0 nm(-1)) and the role of non-geometrical Si nanoparticle characteristics (mutual interaction forces, surface termination, etc).
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Affiliation(s)
- Jonghoon Choi
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA. Biochemical Science Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
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46
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Yoshida T, Taribagil R, Hillmyer MA, Lodge TP. Viscoelastic Synergy in Aqueous Mixtures of Wormlike Micelles and Model Amphiphilic Triblock Copolymers. Macromolecules 2007. [DOI: 10.1021/ma062428+] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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47
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Cabaleiro-Lago C, Nilsson M, Valente AJM, Bonini M, Söderman O. NMR diffusometry and conductometry study of the host–guest association between β-cyclodextrin and dodecane 1,12-bis(trimethylammonium bromide). J Colloid Interface Sci 2006; 300:782-7. [PMID: 16647078 DOI: 10.1016/j.jcis.2006.04.016] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2006] [Revised: 03/30/2006] [Accepted: 04/01/2006] [Indexed: 11/28/2022]
Abstract
Surfactants form association complexes with cyclodextrins. In the present investigation we have used NMR-diffusometry and electrical conductivity to follow the interactions which take place between beta-cyclodextrin and a bolaform surfactant: dodecane 1,12-bis(trimethylammonium bromide). Both (1)H NMR self-diffusion and conductometry data indicate the formation of a 1:1 inclusion complex. Assuming this stoichiometry, it was possible to calculate the association constant; from the analysis of the self-diffusion coefficients of free beta-cyclodextrin and the bolaform surfactant an association constant K=3x10(3)M(-1) was obtained while the analysis of conductivity data gave a comparable value of K=2.5x10(3)M(-1).
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Affiliation(s)
- Celia Cabaleiro-Lago
- Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SE 221 00 Lund, Sweden.
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48
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Shang T, Smith KA, Hatton TA. Self-assembly of a nonionic photoresponsive surfactant under varying irradiation conditions: a small-angle neutron scattering and cryo-TEM study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:1436-42. [PMID: 16460058 DOI: 10.1021/la052215y] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
We have used small-angle neutron scattering (SANS), and cryogenic transmission electron microscopy (cryo-TEM) to determine the structure of aggregates formed by the photoresponsive surfactants diethylene glycol mono(4',4-butyloxy, butyl-azobenzene) (C4AzoOC4E2) and diethylene glycol mono(4',4-hexyloxy, butyl-azobenzene) (C4AzoOC6E2) under different illumination conditions. At high concentrations, the self-assembly behavior of these surfactants changes remarkably in response to different radiation conditions. The trans isomers assemble into bilamellar (C4AzoOC4E2) and unilamellar (C4AzoOC6E2) vesicles, while the cis isomers (under UV light) form bicontinuous phases. These light-induced structural changes are attributed to a change in the sign of the Gaussian rigidity, which is the direct result of azobenzene photoisomerization.
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Affiliation(s)
- Tiangang Shang
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, USA
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49
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Eastoe J, Vesperinas A, Donnewirth AC, Wyatt P, Grillo I, Heenan RK, Davis S. Photodestructible vesicles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:851-3. [PMID: 16430234 DOI: 10.1021/la052882r] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Stable vesicles are formed in a 1.4 wt % solution comprising a 1:3 mixture of the anionic photodestructible surfactant sodium 4-hexylphenylazosulfonate (C6PAS) and inert cationic cetyltrimethylamonium bromide (CTAB). UV irradiation drives an irreversible breakdown of the mixed C6PAS/CATB vesicles, owing to the selective degradation of C6PAS. A light-induced transition from small spherical-like polydisperse vesicles to long needle-like aggregation is observed.
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Affiliation(s)
- Julian Eastoe
- School of Chemistry, University of Bristol, Bristol BS8 1TS, UK.
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