1
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McDowall D, Adams DJ, Seddon AM. Using small angle scattering to understand low molecular weight gels. SOFT MATTER 2022; 18:1577-1590. [PMID: 35147629 DOI: 10.1039/d1sm01707a] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The material properties of a gel are determined by the underpinning network that immobilises the solvent. When gels are formed by the self-assembly of small molecules into a so-called low molecular weight gel, the network is the result of the molecules forming one-dimensional objects such as fibres or nanotubes which entangle or otherwise cross-link to form a three-dimensional network. Characterising the one-dimensional objects and the network is difficult. Many conventional techniques rely on drying to probe the network, which often leads to artefacts. An effective tool to probe the gel in the solvated state is small angle scattering. Both small angle X-ray scattering (SAXS) and small angle neutron scattering (SANS) can be used. Here, we discuss these approaches and provide a tutorial review to describe how these approaches work, what opportunities there are and how the data treatment should be approached. We aim to show the power of this approach and provide enabling information to make them accessible to the non-specialist.
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Affiliation(s)
- Daniel McDowall
- School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK.
| | - Dave J Adams
- School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK.
| | - Annela M Seddon
- School of Physics, HH Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK
- Bristol Centre for Functional Nanomaterials, HH Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK.
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2
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Kanazawa S, Morimoto K, Tabata E, Okura A, Ikemoto Y, Yamamoto K, de Campo L, Akiba I. Self-Assembly of Surfactin into Nanofibers with Hydrophilic Channels in Nonpolar Organic Media. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:7627-7633. [PMID: 32490677 DOI: 10.1021/acs.langmuir.0c01271] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We investigated the self-assembly of surfactin (SFNa), a cyclic peptide amphiphile produced by Bacillus subtilis, in a nonpolar organic solvent, namely, cyclohexane (CHx). The CHx solution of SFNa formed a thermoreversible organogel. Transmission electron microscopy and small-angle X-ray scattering (SAXS) analyses showed that gelation of the CHx solution of SFNa was caused by physical cross-linking of SFNa nanofibers. Wide-angle X-ray diffraction and Fourier-transform infrared analyses showed that the SFNa nanofibers were formed by one-dimensional stacking of SFNa rings with a period of 0.48 nm corresponding to the length of inter-ring hydrogen bonds between amide groups. A combination of SAXS and small-angle neutron scattering investigations of CHx and deuterated CHx solutions of SFNa nanofibers containing H2O or D2O showed that the SFNa nanofibers had a hydrophilic interior and formed water channels by water incorporation in this region.
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Affiliation(s)
- Satoshi Kanazawa
- Department of Chemistry and Biochemistry, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu 8080135, Japan
| | - Kosuke Morimoto
- Department of Chemistry and Biochemistry, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu 8080135, Japan
| | - Eri Tabata
- Department of Chemistry and Biochemistry, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu 8080135, Japan
| | - Aya Okura
- Department of Chemistry and Biochemistry, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu 8080135, Japan
| | - Yuka Ikemoto
- Japan Synchrotron Radiation Facility, 1-1-1 Kouto, Sayo, Hyogo 6795198, Japan
| | - Katsuhiro Yamamoto
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
| | - Liliana de Campo
- Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, New South Wales 2232, Australia
| | - Isamu Akiba
- Department of Chemistry and Biochemistry, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu 8080135, Japan
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3
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Liu H, Yu A, Dai M, Lin D, Lin D, Xu X, Li X, Wang Y. Effects of Terminal Motif on the Self-Assembly of Dexamethasone Derivatives. Front Chem 2020; 8:9. [PMID: 32154209 PMCID: PMC7044695 DOI: 10.3389/fchem.2020.00009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Accepted: 01/07/2020] [Indexed: 12/15/2022] Open
Abstract
Tailoring the terminal motif of molecules including drugs might significantly affect their self-assembly tendency in aqueous solution, thus providing a rational strategy to modulate its macroscopic characteristics of supramolecular assembly. A model drug of dexamethasone (Dex) was esterified by different fatty acids [succinic acid (SA), glutaric acid (GA), and adipic acid (AA)] and aromatic acid [phthalic acid (PA)] to generate a series of Dex derivatives. Aqueous solution of Dex-SA, Dex-GA, and Dex-AA turned into hydrogel spontaneously after a period time of incubation (24, 48, and 72 h, respectively) via the auto-hydrolytic strategy, while aqueous solution of Dex-PA did not result in hydrogelation during 3 days of incubation. Aqueous solutions of Dex-SA, Dex-GA, and Dex-AA underwent apparent hydrolysis (10.73 ± 0.64%, 15.17 ± 2.24%, and 17.29 ± 1.39%, respectively), while Dex-PA exhibited a minimal hydrolysis (<1%) in a period of 28 days study, as indicated by in vitro hydrolytic test. Morphological observation showed that the hydrogel formed by Dex-SA was composed of uniform nanofibers, while hydrogels formed by Dex-GA, and Dex-AA were derived from irregular particles. The mechanical strength of hydrogel formed by Dex-SA was much bigger than that of hydrogels formed by Dex-GA and Dex-AA, as indicated by rheological test. Moreover, the acylation of Dex did not compromise its potent anti-inflammatory activity in a lipopolysaccharide (LPS)-activated RAW 264.7 macrophage.
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Affiliation(s)
- Hui Liu
- School of Ophthalmology & Optometry and Eye Hospital, Institute of Biomedical Engineering, Wenzhou Medical University, Wenzhou, China
| | - Ailing Yu
- School of Ophthalmology & Optometry and Eye Hospital, Institute of Biomedical Engineering, Wenzhou Medical University, Wenzhou, China
| | - Mali Dai
- School of Ophthalmology & Optometry and Eye Hospital, Institute of Biomedical Engineering, Wenzhou Medical University, Wenzhou, China
| | - Dan Lin
- School of Ophthalmology & Optometry and Eye Hospital, Institute of Biomedical Engineering, Wenzhou Medical University, Wenzhou, China
| | - Deqing Lin
- School of Ophthalmology & Optometry and Eye Hospital, Institute of Biomedical Engineering, Wenzhou Medical University, Wenzhou, China
| | - Xu Xu
- School of Ophthalmology & Optometry and Eye Hospital, Institute of Biomedical Engineering, Wenzhou Medical University, Wenzhou, China
| | - Xingyi Li
- School of Ophthalmology & Optometry and Eye Hospital, Institute of Biomedical Engineering, Wenzhou Medical University, Wenzhou, China
| | - Yuqin Wang
- School of Ophthalmology & Optometry and Eye Hospital, Institute of Biomedical Engineering, Wenzhou Medical University, Wenzhou, China
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4
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Cautela J, Severoni E, Redondo-Gómez C, di Gregorio MC, Del Giudice A, Sennato S, Angelini R, D'Abramo M, Schillén K, Galantini L. C-12 vs C-3 substituted bile salts: An example of the effects of substituent position and orientation on the self-assembly of steroid surfactant isomers. Colloids Surf B Biointerfaces 2019; 185:110556. [PMID: 31704607 DOI: 10.1016/j.colsurfb.2019.110556] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 09/08/2019] [Accepted: 10/02/2019] [Indexed: 12/31/2022]
Abstract
Biomolecule derivatives are transversally used in nanotechnology. Deciphering their aggregation behavior is a crucial issue for the rational design of functional materials. To this end, it is necessary to build libraries of selectively functionalized analogues and infer general rules. In this work we enrich the highly applicative oriented collection of steroid derivatives, by reporting a rare example of C-12 selectively modified bile salt. While nature often exploits such position to encode functions, it is unusual and not trivial to prepare similar analogues in the laboratory. The introduction of a tert-butyl phenyl residue at C-12 provided a molecule with a self-assembly that remarkably switched from rigid pole-like structures to twisted ribbons at a biologically relevant critical temperature (∼25 °C). The system was characterized by microscopy and spectroscopy techniques and compared with the C-3 functionalized analogue. The twisted ribbons generate samples with a gel texture and a viscoelastic response. The parallel analysis of the two systems suggested that the observed thermoresponsive self-assemblies occur at similar critical temperatures and are probably dictated by the nature of the substituent, but involve aggregates with different structures depending on position and orientation of the substituent. This study highlights the self-assembly properties of two appealing thermoresponsive systems. Moreover, it adds fundamental insights hereto missing in the investigations of the relation between self-assembly and structure of synthetic steroids, which are valuable for the rational design of steroidal amphiphiles.
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Affiliation(s)
- Jacopo Cautela
- Department of Chemistry, Sapienza University of Rome, P.le A. Moro 5, 00185 Rome, Italy
| | - Emilia Severoni
- Department of Chemistry, Sapienza University of Rome, P.le A. Moro 5, 00185 Rome, Italy
| | - Carlos Redondo-Gómez
- Escuela de Química, Centro de Investigación en Electroquímica y Energía Química (CELEQ), Universidad de Costa Rica, San José, Costa Rica
| | | | | | - Simona Sennato
- CNR-ISC Sede Sapienza, Sapienza University of Rome, P. le A. Moro 5, 00185 Roma, Italy; Department of Physics, Sapienza University of Rome, P. le A. Moro 5, 00185 Roma, Italy
| | - Roberta Angelini
- CNR-ISC Sede Sapienza, Sapienza University of Rome, P. le A. Moro 5, 00185 Roma, Italy; Department of Physics, Sapienza University of Rome, P. le A. Moro 5, 00185 Roma, Italy
| | - Marco D'Abramo
- Department of Chemistry, Sapienza University of Rome, P.le A. Moro 5, 00185 Rome, Italy
| | - Karin Schillén
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Luciano Galantini
- Department of Chemistry, Sapienza University of Rome, P.le A. Moro 5, 00185 Rome, Italy.
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5
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Nandi N, Basak S, Kirkham S, Hamley IW, Banerjee A. Two-Component Fluorescent-Semiconducting Hydrogel from Naphthalene Diimide-Appended Peptide with Long-Chain Amines: Variation in Thermal and Mechanical Strengths of Gels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:13226-13233. [PMID: 27951681 DOI: 10.1021/acs.langmuir.6b02727] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Two-component fluorescent hydrogels have been discovered, containing the mixtures of naphthalene diimide (NDI)-conjugated peptide-functionalized bola-amphiphile and primary amines with long alkyl chains at physiological pH 7.46. The aggregation-induced enhanced emission associated with an NDI-appended peptide in aqueous medium is rare, as water is known to be a good quencher of fluorescence. In this study, an NDI-containing gelator peptide forms a highly fluorescent aggregate in aqueous medium. Absorption and emission spectroscopic techniques reveal the formation of J-aggregates among the chromophoric moieties in their aggregated state in aqueous medium. However, this NDI-containing peptide does not form any gel in aqueous medium. In the presence of the primary amines with long alkyl chains in the buffer solution, it forms two-component fluorescent hydrogels exhibiting bright yellow fluorescence under a UV lamp (365 nm). Probably, the acid-amine interaction between the amines and the bola-amphiphile triggers the gel formation, as evident from Fourier transform infrared data, indicating the presence of a carboxylate group (-COO-) and an ammonium species (NH3+) in the coassembled two-component gel system. Low- and wide-angle powder X-ray diffraction and small-angle X-ray scattering further support the fact that the coassembled state in the gel form is produced by the supramolecular interaction between the NDI-based bola-amphiphile and the long-chain amines. Field-emission scanning electron microscopy and high-resolution transmission electron microscopy images reveal that the π-conjugated coassembled hydrogels exhibit nanofibrillar network morphologies. Interestingly, the coassembled hydrogels exhibit an enhanced fluorescence emission, excited-state lifetime, and quantum yield when compared with those of the NDI-containing amphiphile alone in its self-assembled state in aqueous medium. Moreover, the thermal stability and mechanical strength of these gels have been successfully tuned by varying the alkyl chain length of the corresponding amine. Moreover, these NDI-peptide-conjugated soft materials exhibit semiconducting behavior in their respective coassembled states. This holds future promise to use these peptide-appended NDI-based coassembled soft materials for applications in optoelectronic and other devices.
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Affiliation(s)
- Nibedita Nandi
- Department of Biological Chemistry, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032, India
| | - Shibaji Basak
- Department of Biological Chemistry, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032, India
| | - Steven Kirkham
- Department of Chemistry, University of Reading , Whitenights, Reading RG6 6AD, U.K
| | - Ian W Hamley
- Department of Chemistry, University of Reading , Whitenights, Reading RG6 6AD, U.K
| | - Arindam Banerjee
- Department of Biological Chemistry, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032, India
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6
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Kesava Raju CS, Pramanik B, Kar T, Rao PVC, Choudary NV, Ravishankar R. Low molecular weight gels: potential in remediation of crude oil spillage and recovery. RSC Adv 2016. [DOI: 10.1039/c6ra10462b] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A molecular gelator which has strong gelation ability for different crude oils (light to heavy crudes), and a wide range of refinery products is reported for the first time for its potential application in oil spillage/recovery.
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Affiliation(s)
| | | | - Tanmoy Kar
- Hindustan Petroleum Green R&D Center (HPGRDC)
- Bangalore
- India
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7
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Gigault J, Zhang W, Lespes G, Charleux B, Grassl B. Asymmetrical flow field-flow fractionation analysis of water suspensions of polymer nanofibers synthesized via RAFT-mediated emulsion polymerization. Anal Chim Acta 2014; 819:116-21. [DOI: 10.1016/j.aca.2014.02.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Revised: 01/31/2014] [Accepted: 02/09/2014] [Indexed: 11/27/2022]
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8
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Babu SS, Praveen VK, Ajayaghosh A. Functional π-gelators and their applications. Chem Rev 2014; 114:1973-2129. [PMID: 24400783 DOI: 10.1021/cr400195e] [Citation(s) in RCA: 1220] [Impact Index Per Article: 122.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Sukumaran Santhosh Babu
- Photosciences and Photonics Group, Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST) , Trivandrum 695019, India
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9
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Kar T, Mukherjee S, Das PK. Organogelation through self-assembly of low-molecular-mass amphiphilic peptide. NEW J CHEM 2014. [DOI: 10.1039/c3nj01437a] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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10
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di Gregorio MC, Pavel NV, Jover A, Meijide F, Vázquez Tato J, Soto Tellini VH, Alfaro Vargas A, Regev O, Kasavi Y, Schillén K, Galantini L. pH sensitive tubules of a bile acid derivative: a tubule opening by release of wall leaves. Phys Chem Chem Phys 2013; 15:7560-6. [PMID: 23588347 DOI: 10.1039/c3cp00121k] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Tubules formed by self-assembly of organic molecules have vast potential for nanotechnology applications, and the introduction of sensitivity to stimuli into self-assembly tubules represents a particularly attractive feature. Here we report the preparation and characterization of a molecule obtained by chemical modification of a natural bile acid, a biological surfactant, that self-assembles in pH sensitive tubules in aqueous solutions. The tubules, which are rigid, single-walled and with a diameter of 60 nm, form at pH 8-9 and open up when the pH is increased. The transition is reversible, it occurs in the pH range of 9-10 with an opening mechanism that is remarkably different from those so far proposed in the literature. It involves a release of wall layers similar to leaves, and is determined by a drastic pH-triggered change in the molecular arrangement, which in turn induces a radical modification of the wall curvature. The description of the morphological transformation is provided by means of cryogenic transmission electron microscopy and represents, to our knowledge, the first detailed visualization of pH stimulated tubule opening. UV and circular dichroism spectroscopies are used to investigate the evolution at the molecular level.
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Affiliation(s)
- M Chiara di Gregorio
- Dipartimento di Chimica, Università di Roma La Sapienza, P. le A. Moro 5, 00185 Roma, Italy
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11
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Dutta S, Kar T, Mandal D, Das PK. Structure and properties of cholesterol-based hydrogelators with varying hydrophilic terminals: biocompatibility and development of antibacterial soft nanocomposites. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:316-327. [PMID: 23214716 DOI: 10.1021/la3038389] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The present work demonstrates a rational designing and synthesis of cholesterol-based amino acid containing hydrogelators with the aim to improve the biocompatibility of these amphiphilic molecules. A thorough structure-property correlation of these hydrogelators was carried out by varying the hydrophilic terminal from a neutral amine to a quaternized ammonium chloride. The amphiphiles having a cationic polar head as the hydrophilic domain and cholesterol as the hydrophobic unit showed better water gelation efficiency (minimum gelation concentration (MGC) ∼0.9-3.1%, w/v) than the analogous free amines. Presumably, the additional ionic interactions for the quaternized amphiphiles might have played the crucial role in gelation as counterions also got involved in hydrogen bonding with solvent molecules. Hence, the attainment of desired hydrophilic-lipophilic balance (HLB) of hydrophobic cholesterol in combination with the appropriate hydrophilic terminal led to the development of efficient hydrogels. Microscopic investigations revealed the formation of various supramolecular morphologies of hydrogels due to the variation in the molecular structure of the amphiphile. Spectroscopic investigations showed the involvement of hydrogen-bonding, hydrophobic, and π-π interactions in the self-assembled gelation. Importantly, biocompatibility of all the cholesterol-based hydrogelators tested against human hepatic cancer derived HepG2 cells showed increased cell viability than the previously reported alkyl-chain-based amphiphilic hydrogelators. In order to incorporate broad spectrum antibacterial properties, silver nanoparticles (AgNPs) were synthesized in situ within the hydrogels using sunlight. The amphiphile-AgNP soft nanocomposite exhibited notable bactericidal property against both gram-positive and gram-negative bacteria.
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Affiliation(s)
- Sounak Dutta
- Department of Biological Chemistry, Indian Association for the Cultivation of Science Jadavpur, Kolkata-700 032, India
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12
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Strandman S, Le Dévédec F, Zhu XX. Self-Assembly of Bile Acid–PEG Conjugates in Aqueous Solutions. J Phys Chem B 2012; 117:252-8. [DOI: 10.1021/jp307989a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Satu Strandman
- Department of Chemistry, Université de Montréal, CP 6128, Succursale Centre-ville,
Montreal, QC H3C 3J7, Canada
| | - Frantz Le Dévédec
- Department of Chemistry, Université de Montréal, CP 6128, Succursale Centre-ville,
Montreal, QC H3C 3J7, Canada
| | - X. X. Zhu
- Department of Chemistry, Université de Montréal, CP 6128, Succursale Centre-ville,
Montreal, QC H3C 3J7, Canada
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13
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Guerin G, Qi F, Cambridge G, Manners I, Winnik MA. Evaluation of the Cross Section of Elongated Micelles by Static and Dynamic Light Scattering. J Phys Chem B 2012; 116:4328-37. [DOI: 10.1021/jp210454z] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Gerald Guerin
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto,
ON, M5S 1H6
| | - Fei Qi
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto,
ON, M5S 1H6
| | - Graeme Cambridge
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto,
ON, M5S 1H6
| | - Ian Manners
- School of Chemistry, University of Bristol, Bristol U.K., BS8 1TS
| | - Mitchell A. Winnik
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto,
ON, M5S 1H6
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14
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Bardelang D, Giorgi M, Hornebecq V, Stepanov A, Rizzato E, Zaman MB, Chan G, Ouari O, Tordo P. Perturbation induced formation of a 3D-network of microcrystals producing soft materials. RSC Adv 2012. [DOI: 10.1039/c2ra20208e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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15
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Svobodová H, Noponen V, Kolehmainen E, Sievänen E. Recent advances in steroidal supramolecular gels. RSC Adv 2012. [DOI: 10.1039/c2ra01343f] [Citation(s) in RCA: 184] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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16
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Zhang X, Bera T, Liang W, Fang J. Longitudinal zipping/unzipping of self-assembled organic tubes. J Phys Chem B 2011; 115:14445-9. [PMID: 22073969 DOI: 10.1021/jp2064276] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Stimuli-responsive organic tubes are an attractive supramolecular assembly which has potential applications as a controlled release vehicle. We synthesize a smart organic tube by the coassembly of lithocholic acid (LCA) and taurolithocholic acid (TLCA) in aqueous solution. The coassembled LCA/TLCA tubes can be longitudinally unzipped into flat sheets by capillary force after being dehydrated on substrates. Consequently, the encapsulated guest molecules are released from the unzipping tubes. After the release of guest molecules, the flat sheets can be zipped back into hollow tubes upon hydration with aqueous solution. The zipping/unzipping LCA/TLCA tubes provide a new type of delivery vehicles, which may have potential for surface decontaminations.
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Affiliation(s)
- Xuejun Zhang
- Advanced Materials Processing and Analysis Center, Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816, United States
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17
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Mallia VA, Terech P, Weiss RG. Correlations of Properties and Structures at Different Length Scales of Hydro- and Organo-gels Based on N-Alkyl-(R)-12-Hydroxyoctadecylammonium Chlorides. J Phys Chem B 2011; 115:12401-14. [DOI: 10.1021/jp207182p] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- V. Ajay Mallia
- Department of Chemistry, Georgetown University, Washington, D.C. 20057-1227, United States
| | - Pierre Terech
- SPrAM, UMR CEA/UJF-Grenoble 1, INAC, Grenoble, F-38054, France
| | - Richard G. Weiss
- Department of Chemistry, Georgetown University, Washington, D.C. 20057-1227, United States
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18
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Bile acid alkylamide derivatives as low molecular weight organogelators: Systematic gelation studies and qualitative structural analysis of the systems. J Colloid Interface Sci 2011; 360:633-44. [DOI: 10.1016/j.jcis.2011.04.112] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2011] [Revised: 04/27/2011] [Accepted: 04/28/2011] [Indexed: 11/19/2022]
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19
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Dutta S, Shome A, Kar T, Das PK. Counterion-induced modulation in the antimicrobial activity and biocompatibility of amphiphilic hydrogelators: influence of in-situ-synthesized Ag-nanoparticle on the bactericidal property. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:5000-5008. [PMID: 21446701 DOI: 10.1021/la104903z] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The necessity for the development of new antimicrobial agents due to the ever increasing threat from microbes is causing a rapid surge in research. In the present work, we have shown the efficient antimicrobial activity of a series of amino acid-based hydrogelating amphiphiles through alteration in their counterion. The subtle variation in the counterion from chloride to various organic carboxylates had a significant impact on the antimicrobial properties with notable improvement in biocompatibility toward mammalian cells. Incorporation of a hydrophobic moiety in the counterion augmented the antibacterial property of the amphiphilic hydrogelator as minimum inhibitory concentration (MIC) against the Gram-positive bacterial strain, Bacillus subtilis decreased up to 5-fold (with respect to the chloride) in the case of n-hexanoate. These counterion-varied amphiphilic hydrogelators were also found to be effective against fungal strains (Candida albicans and Saccharomyces cerevisiae) where they exhibited MICs in the range of 1.0-12.5 μg/mL. To widen the spectrum of antibacterial activity, particularly against Gram-negative bacteria, silver nanoparticles (AgNPs) were synthesized in situ within the supramolecular assemblies of the carboxylate hydrogelators. These AgNP-amphiphile soft-nanocomposites showed bactericidal property against both Gram-positive and Gram-negative bacteria. Encouragingly, these carboxylate hydrogelators showed superior biocompatibility toward mammalian cells, HepG2 and NIH3T3, as compared to the chloride analogue at a concentration range of 10-200 μg/mL. Importantly, the AgNP composites also showed sufficient viability to mammalian cells. Because of the intrinsic hydrogelation ability of these counterion-varied amphiphiles, the resulting soft materials and the nanocomposites could find applications in biomedicine and tissue engineering.
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Affiliation(s)
- Sounak Dutta
- Department of Biological Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
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Zhan X, Tamhane K, Bera T, Fang J. Transcription of pH-sensitive supramolecular assemblies into silica: from straight, coiled, and helical tubes to single and double fan-like bundles. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm10937e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Liu C, Hao J, Wu Z. Phase Behavior and Rheological Properties of Salt-Free Catanionic Surfactant Mixtures in the Presence of Bile Acids. J Phys Chem B 2010; 114:9795-804. [DOI: 10.1021/jp103916a] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Changcheng Liu
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, and Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, People’s Republic of China
| | - Jingcheng Hao
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, and Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, People’s Republic of China
| | - Ziyu Wu
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, and Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, People’s Republic of China
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