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Lazrag M, Lemaitre C, Castel C, Hannachi A, Barth D. Aerogel production by supercritical drying of organogels: Experimental study and modelling investigation of drying kinetics. J Supercrit Fluids 2018. [DOI: 10.1016/j.supflu.2018.07.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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2
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Smirnova I, Gurikov P. Aerogel production: Current status, research directions, and future opportunities. J Supercrit Fluids 2018. [DOI: 10.1016/j.supflu.2017.12.037] [Citation(s) in RCA: 97] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Smirnova I, Gurikov P. Aerogels in Chemical Engineering: Strategies Toward Tailor-Made Aerogels. Annu Rev Chem Biomol Eng 2017; 8:307-334. [DOI: 10.1146/annurev-chembioeng-060816-101458] [Citation(s) in RCA: 110] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Irina Smirnova
- Institute of Thermal Separation Processes, Hamburg University of Technology, 21073 Hamburg, Germany
| | - Pavel Gurikov
- Institute of Thermal Separation Processes, Hamburg University of Technology, 21073 Hamburg, Germany
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Salazar-Bautista SC, Chebil A, Pickaert G, Gaucher C, Jamart-Gregoire B, Durand A, Leonard M. Encapsulation and release of hydrophobic molecules from particles of gelled triglyceride with aminoacid-based low-molecular weight gelators. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2016.11.045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Huang Y, Li H, Li Z, Zhang Y, Cao W, Wang L, Liu S. Unusual C-I···O Halogen Bonding in Triazole Derivatives: Gelation Solvents at Two Extremes of Polarity and Formation of Superorganogels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:311-321. [PMID: 27990822 DOI: 10.1021/acs.langmuir.6b03691] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
To investigate the influence of halogen bond (XB) on the gelation of a one-component organogel system, a new family of 5-iodo-1H-1,2,3-triazole and 1H-1,2,3-triazole gelators was designed and synthesized. The iodo gelators (1I, 3I) gelled various solvents at low concentrations and formed many superorganogels, whereas the hydrogenous gelators (1H, 3H) showed much poorer gelling performance. An X-ray analysis of the single crystals of two reference compounds (16I, 16H) reveals that the unusual C-I···O XB interaction is responsible for this difference. The results of spectroscopic examinations (XRD, SEM, 1H NMR, and UV) are well consistent with those of single-crystal analyses. Under the guidance of the XB interaction and the weak π-π interaction, 1I and 3I self-assemble to hexagonal columnar aggregations in the gel state, whereas 1H and 3H, driven by CH-π interactions, feature the formation of gels with a lamellar structure. The mechanical property of iodo gels is much better than that of hydrogenous gels under the same concentration. Gels from 1I respond to the stimuli of Hg2+, Cu2+, Zn2+, and Mg2+ as perchlorate salts, and gels from 1H are selectively responsive to Hg2+ solely.
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Affiliation(s)
- Yaodong Huang
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University , Tianjin 300350, PR China
| | - Huimin Li
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University , Tianjin 300350, PR China
| | - Ziyan Li
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University , Tianjin 300350, PR China
| | - Yan Zhang
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University , Tianjin 300350, PR China
| | - Wenwen Cao
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University , Tianjin 300350, PR China
| | - Luyuan Wang
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University , Tianjin 300350, PR China
| | - Shuxue Liu
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University , Tianjin 300350, PR China
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Nano- and microparticles of gelled oil combining aminoacid-based low molecular weight organogelators and nonionic amphiphilic polysaccharides. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2016.11.036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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7
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Lazrag M, Mejia-Mendez DL, Lemaitre C, Stafford PHE, Hreiz R, Privat R, Hannachi A, Barth D. Thermodynamic and hydrodynamic study of a gas-liquid flow in a cyclone separator downstream supercritical drying. J Supercrit Fluids 2016. [DOI: 10.1016/j.supflu.2016.07.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Li Z, Cao J, Li H, Liu H, Han F, Liu Z, Tong C, Li S. Self-assembled drug delivery system based on low-molecular-weight bis-amide organogelator: synthesis, properties and in vivo evaluation. Drug Deliv 2016; 23:3168-3178. [PMID: 26912188 DOI: 10.3109/10717544.2016.1157841] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
CONTEXT Orgnaogels based on amino acid derivatives have been widely used in the area of drug delivery. OBJECTIVE An organogel system based on l-lysine derivatives was designed and prepared to induce a thermal sensitive implant with higher transition temperature, better mechanical strength, and shorter gelation time. MATERIALS AND METHODS The organogel was prepared by injectable soybean oil and methyl (S)-2,5-ditetradecanamidopentanoate (MDP), which was synthesized for the first time. Candesartan cilexetil (CC) was chosen as model drug. Different formulations were designed and optimized by response surface method. Thermal, rheology properties, and gelation kinetics of the optimized formulation had been characterized. The release behaviors in vitro, as well as in vivo were evaluated in comparison with the oily solution of drugs. Finally, the local inflammation response of in situ organogel was assessed by histological analysis. RESULTS AND DISCUSSION Results showed that the synthesized gelator, MDP, had a good gelation ability and the organogels obtained via the self-assembly of gelators in vegetable oils exhibited great thermal and rheology properties, which guaranteed their state in body. In vivo pharmacokinetic demonstrated that the organogel formulation could extend the drug release and maintain a therapeutically effective plasma concentration at least 10 d. In addition, this implant showed acceptable moderate inflammation. CONCLUSION The in situ forming l-lysine-derivative-based organogel could be a promising matrix for sustained drug delivery of the drugs with low solubility.
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Affiliation(s)
- Zhen Li
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, Liaoning, P.R. China
| | - Jinxu Cao
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, Liaoning, P.R. China
| | - Heran Li
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, Liaoning, P.R. China
| | - Hongzhuo Liu
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, Liaoning, P.R. China
| | - Fei Han
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, Liaoning, P.R. China
| | - Zhenyun Liu
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, Liaoning, P.R. China
| | - Chao Tong
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, Liaoning, P.R. China
| | - Sanming Li
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, Liaoning, P.R. China
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Jamart-Grégoire B, Son S, Allix F, Felix V, Barth D, Jannot Y, Pickaert G, Degiovanni A. Monolithic organic aerogels derived from single amino-acid based supramolecular gels: physical and thermal properties. RSC Adv 2016. [DOI: 10.1039/c6ra20803g] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Supercritical CO2 drying of a low molecular weight organogel lead to the first aerogel in a monolithic form bearing superinsulation properties.
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Affiliation(s)
| | - Sébastien Son
- Laboratoire de Chimie Physique Macromoléculaire
- Lorraine University
- CNRS
- 54001 Nancy
- France
| | - Florent Allix
- Laboratoire de Chimie Physique Macromoléculaire
- Lorraine University
- CNRS
- 54001 Nancy
- France
| | - Vincent Felix
- Laboratoire d'Energétique et de Mécanique Théorique et Appliquée
- Lorraine University
- CNRS
- 54504 Vandoeuvre-lès-Nancy
- France
| | - Danielle Barth
- Laboratoire Réactions et Génie des Procédés
- Lorraine University
- CNRS
- 54001 Nancy
- France
| | - Yves Jannot
- Laboratoire d'Energétique et de Mécanique Théorique et Appliquée
- Lorraine University
- CNRS
- 54504 Vandoeuvre-lès-Nancy
- France
| | - Guillaume Pickaert
- Laboratoire de Chimie Physique Macromoléculaire
- Lorraine University
- CNRS
- 54001 Nancy
- France
| | - Alain Degiovanni
- Laboratoire d'Energétique et de Mécanique Théorique et Appliquée
- Lorraine University
- CNRS
- 54504 Vandoeuvre-lès-Nancy
- France
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Demir-Ordu Ö, Şimşir H, Alper K. Synthesis of bis[N-(p-aryl)-carbamoyloxy]alkanes as new low-molecular weight organogelators. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.01.042] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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11
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Siraj N, Shabbir MA, Ahmad T, Sajjad A, Khan MR, Khan MI, Butt MS. Organogelators as a Saturated Fat Replacer for Structuring Edible Oils. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2015. [DOI: 10.1080/10942912.2014.951891] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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12
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Sarma RJ, Devi K. Cystine-derived bis-naphthalimides as stimuli-responsive fluorescent gelators. NEW J CHEM 2015. [DOI: 10.1039/c4nj01755b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Stimuli-responsive fluorescence modulation of two cystine-derived bis-naphthalimide gelators was demonstrated using fluoride/tetrafluoroborate anions as the chemical inputs.
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Affiliation(s)
| | - Kakali Devi
- Department of Chemistry
- Gauhati University
- Guwahati
- India
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13
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Skilling KJ, Citossi F, Bradshaw TD, Ashford M, Kellam B, Marlow M. Insights into low molecular mass organic gelators: a focus on drug delivery and tissue engineering applications. SOFT MATTER 2014; 10:237-56. [PMID: 24651822 DOI: 10.1039/c3sm52244j] [Citation(s) in RCA: 254] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
In recent years low molecular mass organic gelators (LMOGs) have gained increasing interest as an alternative biomaterial to polymer derived gels, with potential applications in drug delivery and tissue engineering. LMOGs are small organic molecules which self-assemble in water or organic solvents forming a 3D network that entraps the liquid phase resulting in gel formation. In this review, we report the classification of LMOGs into hydrogelators and gelators of organic solvents and we discuss the techniques commonly used to characterise the gels of these gelators with particular reference to specific applications of LMOGs in drug delivery and tissue engineering.
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Affiliation(s)
- Kathryn J Skilling
- School of Pharmacy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK.
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14
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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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Rajkamal R, Chatterjee D, Paul A, Banerjee S, Yadav S. Enantiomeric organogelators from d-/l-arabinose for phase selective gelation of crude oil and their gel as a photochemical micro-reactor. Chem Commun (Camb) 2014; 50:12131-4. [DOI: 10.1039/c4cc05950f] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Easy access via single steps to each enantiomer of a simple chiral organogelator, their gelation abilities and applications are reported.
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Affiliation(s)
- Rajkamal Rajkamal
- Department of Applied Chemistry
- Indian School of Mines
- Dhanbad - 826004, India
| | - Debnath Chatterjee
- Department of Applied Chemistry
- Indian School of Mines
- Dhanbad - 826004, India
| | - Abhijit Paul
- Department of Applied Chemistry
- Indian School of Mines
- Dhanbad - 826004, India
| | | | - Somnath Yadav
- Department of Applied Chemistry
- Indian School of Mines
- Dhanbad - 826004, India
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Bouguet-Bonnet S, Yemloul M, Canet D. New Application of Proton Nuclear Spin Relaxation Unraveling the Intermolecular Structural Features of Low-Molecular-Weight Organogel Fibers. J Am Chem Soc 2012; 134:10621-7. [DOI: 10.1021/ja303679z] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Sabine Bouguet-Bonnet
- Méthodologie RMN (CRM2, UMR 7036,
UL-CNRS), Université de Lorraine, Campus Aiguillettes, B.P. 70239, 54506 Vandœuvre-lès-Nancy
(cedex), France
| | - Mehdi Yemloul
- Méthodologie RMN (CRM2, UMR 7036,
UL-CNRS), Université de Lorraine, Campus Aiguillettes, B.P. 70239, 54506 Vandœuvre-lès-Nancy
(cedex), France
| | - Daniel Canet
- Méthodologie RMN (CRM2, UMR 7036,
UL-CNRS), Université de Lorraine, Campus Aiguillettes, B.P. 70239, 54506 Vandœuvre-lès-Nancy
(cedex), France
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17
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Curcio P, Allix F, Pickaert G, Jamart-Grégoire B. A Favorable, Narrow, δh Hansen-Parameter Domain for Gelation of Low-Molecular-Weight Amino Acid Derivatives. Chemistry 2011; 17:13603-12. [DOI: 10.1002/chem.201101423] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2011] [Indexed: 11/09/2022]
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18
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Yemloul M, Steiner E, Robert A, Bouguet-Bonnet S, Allix F, Jamart-Grégoire B, Canet D. Solvent Dynamical Behavior in an Organogel Phase As Studied by NMR Relaxation and Diffusion Experiments. J Phys Chem B 2011; 115:2511-7. [DOI: 10.1021/jp200281f] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Mehdi Yemloul
- Méthodologie RMN, CRM2 (UMR 7036, UHP-CNRS), Faculté des Sciences et Techniques, B.P. 239, 54506 Vandœuvre-lès-Nancy (Cedex), France
| | - Emilie Steiner
- Méthodologie RMN, CRM2 (UMR 7036, UHP-CNRS), Faculté des Sciences et Techniques, B.P. 239, 54506 Vandœuvre-lès-Nancy (Cedex), France
| | - Anthony Robert
- Méthodologie RMN, CRM2 (UMR 7036, UHP-CNRS), Faculté des Sciences et Techniques, B.P. 239, 54506 Vandœuvre-lès-Nancy (Cedex), France
| | - Sabine Bouguet-Bonnet
- Méthodologie RMN, CRM2 (UMR 7036, UHP-CNRS), Faculté des Sciences et Techniques, B.P. 239, 54506 Vandœuvre-lès-Nancy (Cedex), France
| | - Florent Allix
- Laboratoire de Chimie Physique Macromoléculaire, LCPM (UMR 7568, INPL-CNRS), 1 Rue Grandville, B.P. 451, 54001 Nancy (Cedex), France
| | - Brigitte Jamart-Grégoire
- Laboratoire de Chimie Physique Macromoléculaire, LCPM (UMR 7568, INPL-CNRS), 1 Rue Grandville, B.P. 451, 54001 Nancy (Cedex), France
| | - Daniel Canet
- Méthodologie RMN, CRM2 (UMR 7036, UHP-CNRS), Faculté des Sciences et Techniques, B.P. 239, 54506 Vandœuvre-lès-Nancy (Cedex), France
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Allix F, Curcio P, Pham QN, Pickaert G, Jamart-Grégoire B. Evidence of intercolumnar π-π stacking interactions in amino-acid-based low-molecular-weight organogels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:16818-16827. [PMID: 20873848 DOI: 10.1021/la102864y] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A comparative IR and NMR study of two low-molecular-weight organogels (LMWGs) based on aminoacid derivatives let us point out the hierarchy of the gelation assembly process. Different association states of corresponding organogelator molecules can be observed leading to the supramolecular organization of gel. A first hydrogen bond network of gelators leads to the formation of "head-to-tail" stacking-up, which can be assembled afterward one to the other by π-π stacking interactions. These small supramolecular aggregates (incipient precursor) are still visible in NMR spectra, and they represent, for example, 36% of the total amount of gelator in the case of the L-phenylalanine derivative (gelator 1) at 1 wt % in toluene. Finally, in the last step, the incipient precursor tends to form the expected 3D fibrillar network responsible for the gelation phenomenon. Temperature-dependent IR and NMR experiments allowed us to identify these different states clearly.
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Affiliation(s)
- Florent Allix
- Laboratoire de Chimie-Physique Macromoléculaire, UMR CNRS-INPL 7568, Nancy-Université, ENSIC, 1 rue Grandville, BP 20451, 54001 Nancy Cedex, France
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Pasquali RC, Sacco N, Bregni C. Stability of Lipogels with Low Molecular Mass Gelators and Emollient Oils. J DISPER SCI TECHNOL 2010. [DOI: 10.1080/01932690903212263] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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21
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Stable organogels derived from triazines functionalized with chiral α-amino acid derivatives. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.06.101] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Pham QN, Brosse N, Frochot C, Dumas D, Hocquet A, Jamart-Grégoire B. Influence of the gelator structure and solvent on the organisation and chirality of self-assembling fibrillar networks. NEW J CHEM 2008. [DOI: 10.1039/b714375c] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Escuder B, LLusar M, Miravet JF. Insight on the NMR study of supramolecular gels and its application to monitor molecular recognition on self-assembled fibers. J Org Chem 2007; 71:7747-52. [PMID: 16995682 DOI: 10.1021/jo0612731] [Citation(s) in RCA: 151] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The 1H NMR study of supramolecular gels formed by two organogelators derived from valine is described. The analysis of the variation of chemical shift values and relaxation times in the gel samples reveals that in these systems only discrete species are observed by 1H NMR. The reduced T2 values and negative NOEs that are measured upon gel formation can be ascribed to an exchange between discrete organogelator species and the gel network. This process is found to be fast in the time scale of 1H NMR relaxation and slow in the NMR observation frequency time scale. It is shown here that other molecules, aside from the gelator itself, can interact with the gel network and this process can be monitored easily by measurement of relaxation times. As a proof of principle, the selective interaction of 2,2'-bis(hydroxymethyl)biphenyl over diphenylmethane with the self-assembled fibers formed by one of the gelators in benzene is described.
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Affiliation(s)
- Beatriu Escuder
- Departament de Química Inorgànica i Orgànica, Universitat Jaume I, 12071 Castelló, Spain
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Enhanced gelation property due to intra-molecular hydrogen bonding in a new series of bis(amino acid)-functionalized pyridine-2,6-dicarboxamide organogelators. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.02.037] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Chow HF, Zhang J, Lo CM, Cheung SY, Wong KW. Improving the gelation properties of 3,5-diaminobenzoate-based organogelators in aromatic solvents with additional aromatic-containing pendants. Tetrahedron 2007. [DOI: 10.1016/j.tet.2006.10.066] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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28
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Li Y, Liu K, Liu J, Peng J, Feng X, Fang Y. Amino acid derivatives of cholesterol as "latent" organogelators with hydrogen chloride as a protonation reagent. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:7016-20. [PMID: 16863254 DOI: 10.1021/la060394t] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
A series of low molecular weight organic gelator (LMOG) gel systems sensitive to alkaline/acidic stimuli was established by employing amino acid derivatives of cholesterol as "latent" gelators, which are cholesteryl glycinate (1), cholesteryl L-alaninate, cholesteryl D-alaninate, cholesteryl L-phenyl alaninate, and cholesteryl D-phenyl alaninate. The hydrochloric salts are denoted as 2, 3, 4, 5, and 6, respectively. For the 18 solvents tested, one proved to be a weak gelator and gels only two of the solvents. Its gelation ability, however, was greatly improved by bubbling HCl gas, which was produced by reaction of concentrated sulfuric acid with NaCl, through its solution owing to protonation of its amino group. It was demonstrated that the protonated form of it gelled 14 of the solvents tested. Further investigation revealed that the gels changed into solution with addition of any of the amines, including triethylamine (TEA), diethylamine, ethylenediamine, and NH3. The phase transition could be reversed by further introduction of the acidic gas. SEM measurements showed that 1 self-assembled into different supramolecular structures in different gels. Salt effect studies proved that electrostatic interaction is one of the driving forces for formation of the gels.
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Affiliation(s)
- Yuangang Li
- Key Laboratory for Macromolecular Science of Shaanxi Province, School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an 710062, P. R. China
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Bhattacharya S, Srivastava A, Pal A. Modulation of Viscoelastic Properties of Physical Gels by Nanoparticle Doping: Influence of the Nanoparticle Capping Agent. Angew Chem Int Ed Engl 2006; 45:2934-7. [PMID: 16550614 DOI: 10.1002/anie.200504461] [Citation(s) in RCA: 152] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Santanu Bhattacharya
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India.
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Bhattacharya S, Srivastava A, Pal A. Modulation of Viscoelastic Properties of Physical Gels by Nanoparticle Doping: Influence of the Nanoparticle Capping Agent. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200504461] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Suzuki M, Nanbu M, Yumoto M, Shirai H, Hanabusa K. Novel dumbbell-form low-molecular-weight gelators based on l-lysine: their hydrogelation and organogelation properties. NEW J CHEM 2005. [DOI: 10.1039/b511158g] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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