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Galantini L, di Gregorio MC, Gubitosi M, Travaglini L, Tato JV, Jover A, Meijide F, Soto Tellini VH, Pavel NV. Bile salts and derivatives: Rigid unconventional amphiphiles as dispersants, carriers and superstructure building blocks. Curr Opin Colloid Interface Sci 2015. [DOI: 10.1016/j.cocis.2015.08.004] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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2
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Jamieson SA, Tong KWK, Hamilton WA, He L, James M, Thordarson P. Small angle neutron scattering (SANS) studies on the structural evolution of pyromellitamide self-assembled gels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:13987-13993. [PMID: 25361640 DOI: 10.1021/la502546n] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The kinetics of aggregation of two pyromellitamide gelators, tetrabutyl- (C4) and tetrahexyl-pyromellitamide (C6), in deuterated cyclohexane has been investigated by small angle neutron scattering (SANS) for up to 6 days. The purpose of this study was to improve our understanding of how self-assembled gels are formed. Short-term (< 3 h) time scales revealed multiple phases with the data for the tetrabutylpyromellitamide C4, indicating one-dimensional stacking and aggregation corresponding to a multifiber braided cluster arrangement that is about 35 Å in diameter. The corresponding tetrahexylpyromellitamide C6 data suggest that the C6 also forms one-dimensional stacks but that these aggregate to a thicker multifiber braided cluster that has a diameter of about 62 Å. Over a longer period of time, the radius, persistence length, and contour length all continue to increase in 6 days after cooling. These data suggest that structural changes in self-assembled gels occur over a period exceeding several days and that fairly subtle changes in the structure (e.g., tail-length) can influence the packing of molecules in self-assembled gels on the single-to-few fiber bundle stage.
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Affiliation(s)
- Scott A Jamieson
- School of Chemistry and the Australian Centre for Nanomedicine, The University of New South Wales , Sydney, NSW 2052 Australia
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3
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Li C, Wang G, Gao H, Zhai M, Li J. Temperature-, pH-, and ion-stimulus-responsive swelling behaviors of poly(dimethylaminoethyl methacrylate) gel containing cholic acid. J Appl Polym Sci 2013. [DOI: 10.1002/app.39998] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Cancan Li
- School of Materials and Engineering; University of Science and Technology Beijing; Beijing 100083 China
- Beijing National Laboratory for Molecular Sciences, Department of Applied Chemistry; College of Chemistry and Molecular Engineering, Peking University; Beijing 100871 China
| | - Guojie Wang
- School of Materials and Engineering; University of Science and Technology Beijing; Beijing 100083 China
| | - Hongyi Gao
- School of Materials and Engineering; University of Science and Technology Beijing; Beijing 100083 China
| | - Maolin Zhai
- Beijing National Laboratory for Molecular Sciences, Department of Applied Chemistry; College of Chemistry and Molecular Engineering, Peking University; Beijing 100871 China
| | - Jiuqiang Li
- Beijing National Laboratory for Molecular Sciences, Department of Applied Chemistry; College of Chemistry and Molecular Engineering, Peking University; Beijing 100871 China
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4
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Chakrabarty A, Maitra U. Organogels from Dimeric Bile Acid Esters: In Situ Formation of Gold Nanoparticles. J Phys Chem B 2013; 117:8039-46. [DOI: 10.1021/jp4029497] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Arkajyoti Chakrabarty
- Department of Organic
Chemistry, Indian Institute of Science, Bangalore 560012, Karnataka
| | - Uday Maitra
- Department of Organic
Chemistry, Indian Institute of Science, Bangalore 560012, Karnataka
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5
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Kandanelli R, Maitra U. Charge-transfer interaction mediated organogels from bile acid appended anthracenes: rheological and microscopic studies. Photochem Photobiol Sci 2012; 11:1724-9. [DOI: 10.1039/c2pp25088h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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6
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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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7
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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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8
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Maitra U, Chakrabarty A. Protonation and deprotonation induced organo/hydrogelation: Bile acid derived gelators containing a basic side chain. Beilstein J Org Chem 2011; 7:304-9. [PMID: 21448259 PMCID: PMC3063068 DOI: 10.3762/bjoc.7.40] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Accepted: 03/02/2011] [Indexed: 11/23/2022] Open
Abstract
Two bile acid derived molecules containing basic amino groups are reported to be efficient and unusual gelators of organic and aqueous solvents.
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Affiliation(s)
- Uday Maitra
- Department of Organic Chemistry, Indian Institute of Science, Bangalore-560012, India
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Banerjee S, Vidya VM, Savyasachi AJ, Maitra U. Perfluoroalkyl bile esters: a new class of efficient gelators of organic and aqueous–organic media. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm11912e] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Griffiths PC, Knight DW, Morgan IR, Ford A, Brown J, Davies B, Heenan RK, King SM, Dalgliesh RM, Tomkinson J, Prescott S, Schweins R, Paul A. Gelation or molecular recognition; is the bis-(α,β-dihydroxy ester)s motif an omnigelator? Beilstein J Org Chem 2010; 6:1079-88. [PMID: 21160568 PMCID: PMC3002023 DOI: 10.3762/bjoc.6.123] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2010] [Accepted: 11/02/2010] [Indexed: 11/23/2022] Open
Abstract
Understanding the gelation of liquids by low molecular weight solutes at low concentrations gives an insight into many molecular recognition phenomena and also offers a simple route to modifying the physical properties of the liquid. Bis-(α,β-dihydroxy ester)s are shown here to gel thermoreversibly a wide range of solvents, raising interesting questions as to the mechanism of gelation. At gelator concentrations of 5-50 mg ml⁻¹, gels were successfully formed in acetone, ethanol/water mixtures, toluene, cyclohexane and chloroform (the latter, albeit at a higher gelator concentration). A range of neutron techniques - in particular small-angle neutron scattering (SANS) - have been employed to probe the structure of a selection of these gels. The universality of gelation in a range of solvent types suggests the gelation mechanism is a feature of the bis-(α,β-dihydroxy ester) motif, with SANS demonstrating the presence of regular structures in the 30-40 Å range. A correlation between the apparent rodlike character of the structures formed and the polarity of the solvent is evident. Preliminary spin-echo neutron scattering studies (SESANS) indicated the absence of any larger scale structures. Inelastic neutron spectroscopy (INS) studies demonstrated that the solvent is largely unaffected by gelation, but does reveal insights into the thermal history of the samples. Further neutron studies of this kind (particularly SESANS and INS) are warranted, and it is hoped that this work will stimulate others to pursue this line of research.
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Affiliation(s)
- Peter C Griffiths
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
| | - David W Knight
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
| | - Ian R Morgan
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
| | - Amy Ford
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
| | - James Brown
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
| | - Ben Davies
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
| | - Richard K Heenan
- Rutherford Appleton Laboratory, Science and Technology Research Council, Didcot, Oxfordshire OX11 0QX U.K
| | - Stephen M King
- Rutherford Appleton Laboratory, Science and Technology Research Council, Didcot, Oxfordshire OX11 0QX U.K
| | - Robert M Dalgliesh
- Rutherford Appleton Laboratory, Science and Technology Research Council, Didcot, Oxfordshire OX11 0QX U.K
| | - John Tomkinson
- Rutherford Appleton Laboratory, Science and Technology Research Council, Didcot, Oxfordshire OX11 0QX U.K
| | - Stuart Prescott
- School of Chemistry, Bristol University, Cantock’s Close, Bristol BS8 1TS U.K
| | - Ralf Schweins
- Institut Laue Langevin, 6 rue Jules Horowitz, 38042 Grenoble, Cedex 9, France
| | - Alison Paul
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
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Côte M, Nicholls T, Knight DW, Morgan IR, Rogueda PGA, King SM, Heenan RK, Griffiths PC. Self-assembling chiral gelators for fluorinated media. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:8678-8684. [PMID: 19402688 DOI: 10.1021/la804277z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Formulations involving partially and fully fluorinated media represent a technological challenge given the lipophobic and hydrophobic nature of such liquids. The identification of self-associating materials with which to control the viscosity and solubilizing characteristics of fluorinated solvents is a particularly interesting area of research. It is shown here that the presence of the stereogenic centers inherent in a family of bis-(alpha,beta-dihydroxy ester)s is an essential requirement for the thermoreversible gelation of mixtures of partially fluorinated liquids 2H,3H-perfluoropentane (HPFP) and 1H,1H-heptafluorobutanol (HFB). Gelation is driven by hydrogen bonding, which induces a nonpreferred conformation around the bis-(alpha,beta-dihydroxy ester) structural motif. An analysis of the melting temperature yields an enthalpy of melting that is consistent with three to four hydrogen bonds, commensurate with the end-group structure of the gelator. Small-angle neutron scattering demonstrated the existence of the common fibrillar structures whose dimensions showed no obvious correlation with the molecular structure of the gelator.
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Affiliation(s)
- Marie Côte
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK
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12
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Zhang XB, Li M. Synthesis and self-assembly of novel hydrazide derivatives containing multi-alkoxy chains with different lengths. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2008.06.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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14
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Zhang X, Li Z, Zhu XX. Biomimetic Mineralization Induced by Fibrils of Polymers Derived from a Bile Acid. Biomacromolecules 2008; 9:2309-14. [DOI: 10.1021/bm800204t] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Xu Zhang
- Key Laboratory of Functional Polymer Materials, Institute of Polymer Chemistry, Nankai University, Tianjin, 300071, China, and Département de Chimie, Université de Montréal, C.P. 6128, Succ. Centre-ville, Montréal, QC, H3C 3J7, Canada
| | - Zhanyong Li
- Key Laboratory of Functional Polymer Materials, Institute of Polymer Chemistry, Nankai University, Tianjin, 300071, China, and Département de Chimie, Université de Montréal, C.P. 6128, Succ. Centre-ville, Montréal, QC, H3C 3J7, Canada
| | - X. X. Zhu
- Key Laboratory of Functional Polymer Materials, Institute of Polymer Chemistry, Nankai University, Tianjin, 300071, China, and Département de Chimie, Université de Montréal, C.P. 6128, Succ. Centre-ville, Montréal, QC, H3C 3J7, Canada
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Banerjee A, Palui G, Banerjee A. Pentapeptide based organogels: the role of adjacently located phenylalanine residues in gel formation. SOFT MATTER 2008; 4:1430-1437. [PMID: 32907108 DOI: 10.1039/b802205b] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A terminally protected self-assembling pentapeptide Boc-Leu(1)-Val(2)-Phe(3)-Phe(4)-Ala(5)-OMe 1 bearing sequence similarity with Aβ17-21 (the fragment 17-21 of the amyloid β-peptide Aβ42) forms thermoreversible transparent gels in various organic solvents including benzene, toluene, m-xylene and 1,2-dichlorobenzene. A series of its variants have been synthesized in order to study the role of adjacently located phenylalanine residues and the protecting groups for gelation in different organic solvents. Replacement of any of the Phe residues of the Phe-Phe segment with any other hydrophobic α-amino acid residue drastically changes the gel forming properties indicating that both Phe residues have an important role in gel formation. These gels are characterised using field emission scaning electron microscopy (FE-SEM), transmission electron microscopy (TEM), FT-IR and wide angle X-ray scattering (WAXS) studies. WAXS studies of the peptide 1-benzene gel indicate that π-π interaction is responsible for gel formation and it reveals the necessity of the Phe residues in gel formation. Transmission electron microscopy (TEM) of the gels reveals a nanofibrillar morphology, which is obtained from the self-assembled gelators in the gel phase. These gels bind with a physiological dye, Congo red, and show a green birefringence under cross polarizers, which is a characteristic feature of amyloid fibrils.
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Affiliation(s)
- Arijit Banerjee
- Department of Biological Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Goutam Palui
- Department of Biological Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Arindam Banerjee
- Chemistry Division, Indian Institute of Chemical Biology, Jadavpur, Kolkata 700 032, India. and Department of Biological Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
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16
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Organogelators from self-assembling peptide based dendrimers: structural and morphological features. Tetrahedron 2008. [DOI: 10.1016/j.tet.2007.10.061] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Maitra U. Simple esters of cholic acid as potent organogelators: direct imaging of the collapse of SAFINs. SOFT MATTER 2007; 3:1428-1433. [PMID: 32900124 DOI: 10.1039/b711010c] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Unusual gelation of a number of organic solvents by allyl cholate and other simple esters of cholic acid is reported. These gels were characterized by SEM, AFM, polarizing optical microscopy (POM), X-ray powder diffraction and other techniques. Electron micrographs of the xerogels revealed the presence of highly entangled 3D fibrillar networks. Direct imaging of the collapse of SAFINs and their thermal stability were performed using variable temperature polarizing optical microscopy (POM).
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Affiliation(s)
- Uday Maitra
- Department of Organic Chemistry, Indian Institute of Science, Bangalore-12, India. and The Chemical Biology Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India
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Das AK, Manna S, Drew MGB, Malik S, Nandi AK, Banerjee A. Low Molecular Weight Organogelators from Self-assembling Synthetic Tripeptides With Coded Amino Acids: Morphological, Structural, Thermodynamic and Spectroscopic Investigations. Supramol Chem 2007. [DOI: 10.1080/10610270601035553] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Apurba K. Das
- a Department of Biological Chemistry , Indian Association for the Cultivation of Science , Jadavpur, Kolkata, 700 032, India
| | - Swarup Manna
- b Polymer Science Unit , Indian Association for the Cultivation of Science , Jadavpur, Kolkata, 700 032, India
| | - Michael G. B. Drew
- c School of Chemistry, The University of Reading , Whiteknights, Reading, RG6 6AD, UK
| | - Sudip Malik
- b Polymer Science Unit , Indian Association for the Cultivation of Science , Jadavpur, Kolkata, 700 032, India
| | - Arun K. Nandi
- b Polymer Science Unit , Indian Association for the Cultivation of Science , Jadavpur, Kolkata, 700 032, India
| | - Arindam Banerjee
- a Department of Biological Chemistry , Indian Association for the Cultivation of Science , Jadavpur, Kolkata, 700 032, India
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Yount WC, Loveless DM, Craig SL. Small-Molecule Dynamics and Mechanisms Underlying the Macroscopic Mechanical Properties of Coordinatively Cross-Linked Polymer Networks. J Am Chem Soc 2005; 127:14488-96. [PMID: 16218645 DOI: 10.1021/ja054298a] [Citation(s) in RCA: 256] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Specific metal-ligand coordination between bis-Pd(II) and Pt(II) organometallic cross-linkers and poly(4-vinylpyridine) in DMSO defines a three-dimensional associative polymer network. Frequency-dependent dynamic mechanical moduli of a series of four different bulk materials, measured across several decades of oscillatory strain rates, are found to be quantitatively related through the pyridine exchange rates measured on model Pd(II) and Pt(II) complexes. Importantly, the mechanism of ligand exchange in the networks is found to be the same solvent-assisted pathway observed in the model complexes, and so the bulk mechanical properties are determined by relaxations that occur when the cross-links are dissociated from the polymer backbone. It is how often the cross-links dissociate, independently of how long they remain dissociated, that determines the bulk mechanical properties. The quantitative relationship between bulk materials properties and the kinetics and mechanisms observed in model compounds holds promise for the rational, molecular design of materials with tailored mechanical properties.
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Affiliation(s)
- Wayne C Yount
- Department of Chemistry and Center for Biologically Inspired Materials and Material Systems, Duke University, Durham, NC 27708-0346, USA
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20
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Supramolecular hydrogels and organogels based on novel l-valine and l-isoleucine amphiphiles. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2004.11.027] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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