1
|
Kothari M, Kannan K, Sahadevan R, Sadhukhan S. Novel molecular hybrids of EGCG and quinoxaline: Potent multi-targeting antidiabetic agents that inhibit α-glucosidase, α-amylase, and oxidative stress. Int J Biol Macromol 2024; 263:130175. [PMID: 38360242 DOI: 10.1016/j.ijbiomac.2024.130175] [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: 10/20/2023] [Revised: 02/11/2024] [Accepted: 02/12/2024] [Indexed: 02/17/2024]
Abstract
Diabetes mellitus is a multifactorial disease and its effective therapy often demands several drugs with different modes of action. Herein, we report a rational design and synthesis of multi-targeting novel molecular hybrids comprised of EGCG and quinoxaline derivatives that can effectively inhibit α-glucosidase, α-amylase as well as control oxidative stress by scavenging ROS. The hybrids showed superior inhibition of α-glucosidase along with similar α-amylase inhibition as compared to standard drug, acarbose. Most potent compound, 15c showed an IC50 of 0.50 μM (IC50 of acarbose 190 μM) against α-glucosidase. Kinetics studies with 15c revealed a competitive inhibition against α-glucosidase. Binding affinity of 15c (-9.5 kcal/mol) towards α-glucosidase was significantly higher than acarbose (-7.7 kcal/mol). 15c exhibited remarkably high antioxidant activity (IC50 = 18.84 μM), much better than vitamin C (IC50 = 33.04 μM). Of note, acarbose shows no antioxidant activity. Furthermore, α-amylase activity was effectively inhibited by 15c with an IC50 value of 16.35 μM. No cytotoxicity was observed for 15c (up to 40 μM) in MCF-7 cells. Taken together, we report a series of multi-targeting molecular hybrids capable of inhibiting carbohydrate hydrolysing enzymes as well as reducing oxidative stress, thus representing an advancement towards effective and novel therapeutic approaches for diabetes.
Collapse
Affiliation(s)
- Manan Kothari
- Department of Chemistry, Indian Institute of Technology Palakkad, Kerala 678 623, India
| | - Karthika Kannan
- Department of Chemistry, Indian Institute of Technology Palakkad, Kerala 678 623, India
| | - Revathy Sahadevan
- Department of Chemistry, Indian Institute of Technology Palakkad, Kerala 678 623, India
| | - Sushabhan Sadhukhan
- Department of Chemistry, Indian Institute of Technology Palakkad, Kerala 678 623, India; Physical & Chemical Biology Laboratory and Department of Biological Sciences & Engineering, Indian Institute of Technology Palakkad, Kerala 678 623, India.
| |
Collapse
|
2
|
Self-assembly, surface, antibacterial, and solubilization properties of phenylglycine type amino acid-based cationic surfactants. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
3
|
Chen H, Zhu B, Zhang Y, Liu X. Effect of selenium‐position on the redox responsivity of isomeric selenium‐containing anionic surfactants. J SURFACTANTS DETERG 2021. [DOI: 10.1002/jsde.12559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Hui Chen
- Key Laboratory of Synthetic and Biological Colloids Ministry of Education, School of Chemical and Material Engineering, Jiangnan University Wuxi People's Republic of China
| | - Bo Zhu
- Key Laboratory of Synthetic and Biological Colloids Ministry of Education, School of Chemical and Material Engineering, Jiangnan University Wuxi People's Republic of China
| | - Yongmin Zhang
- Key Laboratory of Synthetic and Biological Colloids Ministry of Education, School of Chemical and Material Engineering, Jiangnan University Wuxi People's Republic of China
| | - Xuefeng Liu
- Key Laboratory of Synthetic and Biological Colloids Ministry of Education, School of Chemical and Material Engineering, Jiangnan University Wuxi People's Republic of China
| |
Collapse
|
4
|
Reeve JR, Thomas RK, Penfold J. Surface Activity of Ethoxylate Surfactants with Different Hydrophobic Architectures: The Effect of Layer Substructure on Surface Tension and Adsorption. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:9269-9280. [PMID: 34308653 DOI: 10.1021/acs.langmuir.1c01588] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
A series of nonionic ethoxylate surfactants containing different combinations of alkyl, phenyl, and adamantyl units in nine different arrangements, each combined with penta- and hexa-ethylene glycol groups, were synthesized and purified. The surface properties of all of the surfactants were investigated at the air-water (A-W) interface using surface tension (ST) to determine the limiting surface excess (Γlim), the limiting surface tension (σlim), and the critical micelle concentration (CMC). A smaller selection was investigated at the hydrophilic silica-water interface by neutron reflectometry to obtain the thickness of the adsorbed layer and the total adsorption at the CMC. An unusual and largely unrecognized feature of the ethoxylate group is that it is both hydrophilic and hydrophobic. It was found possible to account for the variation of σlim and Γlim of all of the adsorbed layers in terms of a balance of the estimated STs of the sublayers forming the overall adsorbed layer, including that of the underlying ethoxylate layer. The values of σlim were found to be highest for phenyl- and adamantyl-capped surfactants and lowest mainly when there was more than one methyl group at the surface. However, in terms of the concentration required to reach a given low ST, increasing the number of attached methyl groups was found to be less effective than using a smaller number of better-placed methyl groups. At the solid-liquid interface, adsorption at or above the CMC was in all cases in the form of a fragmented bilayer whose coverage varied approximately linearly with the packing parameter. However, results on the phenyl-capped surfactants showed that the high ST exhibited by these surfactants at the A-W interface becomes a high cohesion energy in the interior of the bilayer and they exhibited significantly higher adsorption than expected from simple packing arguments.
Collapse
Affiliation(s)
- James R Reeve
- Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, U.K
| | - Robert K Thomas
- Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, U.K
| | - Jeffrey Penfold
- Rutherford-Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, U.K
- Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, U.K
| |
Collapse
|
5
|
Qi XJ, Sun M, Hou BS, Yu X, Shan GG, Sun CY, Yousaf A, Wang XL, Su ZM. A thiol-functionalized zirconium metal-organic cage for the effective removal of Hg 2+ from aqueous solution. NANOTECHNOLOGY 2021; 32:075602. [PMID: 33241790 DOI: 10.1088/1361-6528/abba99] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The mercury ions in waste water have threatened public health and environmental protection. In this sense, novel materials with outstanding performances for removal of Hg2+ are imperative. Herein, we demonstrate a thiol-functionalized zirconium metal-organic cage (MOC-(SH)2) with excellent dispersion displays ideal properties for Hg2+ capture. MOC-(SH)2 exhibits the ability of removing Hg2+ in aqueous solutions with a capacity of 335.9 mgHg2+/gMOC-(SH)2, which surpasses that of classical Zr-based metal-organic framework Uio-66-(SH)2 by 1.89 folds. The higher loading capacity of MOC-(SH)2 is probably owing to the excellent dispersion of the discrete cage, which makes the accessibility of binding sites (thiol) easier. Additionally, 99.6% of Hg2+ can be effectively captured by MOC-(SH)2 with the concentration decreased from 5 to 0.02 ppm reaching the permissible limit for Hg2+, outperforming the performance of Uio-66-(SH)2. The excellent absorption property of MOC-(SH)2 is also achieved in terms of superior selectivity under the presence of competitive metal ions. Meanwhile, the regenerated MOC-(SH)2 can be reused without apparent loss of Hg2+ loading capacity. UV-vis absorption spectra, IR spectra and emission spectra further verified the strong chemical affinity between Hg2+ and the thiol of MOC-(SH)2. The study lays the groundwork for using Zr-MOCs in the removal of toxic metal ions and environmental sustainability.
Collapse
Affiliation(s)
- Xiang-Juan Qi
- National and Local United Engineering Laboratory for Power Batteries, Northeast Normal University, Changchun, Jilin, People's Republic of China
| | - Min Sun
- National and Local United Engineering Laboratory for Power Batteries, Northeast Normal University, Changchun, Jilin, People's Republic of China
| | - Bao-Shan Hou
- National and Local United Engineering Laboratory for Power Batteries, Northeast Normal University, Changchun, Jilin, People's Republic of China
| | - Xiang Yu
- National and Local United Engineering Laboratory for Power Batteries, Northeast Normal University, Changchun, Jilin, People's Republic of China
| | - Guo-Gang Shan
- National and Local United Engineering Laboratory for Power Batteries, Northeast Normal University, Changchun, Jilin, People's Republic of China
| | - Chun-Yi Sun
- National and Local United Engineering Laboratory for Power Batteries, Northeast Normal University, Changchun, Jilin, People's Republic of China
| | - Afifa Yousaf
- National and Local United Engineering Laboratory for Power Batteries, Northeast Normal University, Changchun, Jilin, People's Republic of China
| | - Xin-Long Wang
- National and Local United Engineering Laboratory for Power Batteries, Northeast Normal University, Changchun, Jilin, People's Republic of China
| | - Zhong-Min Su
- National and Local United Engineering Laboratory for Power Batteries, Northeast Normal University, Changchun, Jilin, People's Republic of China
- Jilin Provincial Science and Technology Innovation Center of Optical Materials and Chemistry, School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, Jilin, People's Republic of China
| |
Collapse
|
6
|
Chen H, Tan J. Aggregation Behavior and Intermolecular Interaction of Cationic Trisiloxane Surfactants: Effects of Unsaturation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:14582-14588. [PMID: 33211964 DOI: 10.1021/acs.langmuir.0c02332] [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
Imidazolium/pyridinium-based trisiloxane surfactants containing a phenyl or vinyl group in the hydrophobic siloxane chain, bis(vinyldimethylsiloxy)methylsilylpropyl-pyridinium chloride (Vi-Si3pyrCl), bis(vinyldimethylsiloxy)methylsilylpropyl-imidazolium chloride (Vi-Si3minCl), and bis(phenyldimethylsiloxy)methylsilylpropylimidazolium chloride (Ph-Si3minCl), were synthesized and confirmed by nuclear magnetic resonance (NMR) (1H, 13C, and 29Si NMR), mass spectrometry, and Fourier transform infrared spectrometry. The effect of the phenyl/vinyl group on their micellization behavior was studied by surface tension, electric conductivity, dynamic light scattering, 2D nuclear Overhauser effect spectroscopy (NOESY) NMR, and transmission electron microscopy. Owing to the hydrophobicity of the siloxane groups and cationic head groups, the critical micelle concentration (cmc) values follow the order Ph-Si3minCl < Vi-Si3pyrCl < Vi-Si3minCl < Si3pyrCl. Ph-Si3minCl has a larger γcmc value, resulting from the introduction of the phenyldimethylsiloxy unit (π-π stacking interaction). The β values of Vi-Si3minCl and Ph-Si3minCl increase with the increase in temperature, which is attributed to the intermolecular interaction which hinders the association of Cl- with the imidazolium ring and confirmed by 2D NOESY NMR. In aqueous solutions, the investigated cationic trisiloxane surfactants can self-assemble into spherical aggregates.
Collapse
Affiliation(s)
- Hao Chen
- School of Chemical and Environmental Engineering, Jiujiang University, Jiujiang, Jiangxi 332005, China
| | - Jinglin Tan
- School of Chemical and Environmental Engineering, Jiujiang University, Jiujiang, Jiangxi 332005, China
| |
Collapse
|
7
|
Lukáč M, Pisárčik M, Garajová M, Mrva M, Dušeková A, Vrták A, Horáková R, Horváth B, Devínsky F. Synthesis, Surface Activity, and Biological Activities of Phosphonium and Metronidazole Salts. J SURFACTANTS DETERG 2020. [DOI: 10.1002/jsde.12439] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Miloš Lukáč
- Department of Chemical Theory of Drugs, Faculty of Pharmacy Comenius University Kalinčiakova 8 Bratislava SK‐83232 Slovakia
| | - Martin Pisárčik
- Department of Chemical Theory of Drugs, Faculty of Pharmacy Comenius University Kalinčiakova 8 Bratislava SK‐83232 Slovakia
| | - Mária Garajová
- Department of Zoology, Faculty of Natural Sciences Comenius University Mlynská dolina Ilkovičova 6 Bratislava SK‐84215 Slovakia
| | - Martin Mrva
- Department of Zoology, Faculty of Natural Sciences Comenius University Mlynská dolina Ilkovičova 6 Bratislava SK‐84215 Slovakia
| | - Aneta Dušeková
- Department of Zoology, Faculty of Natural Sciences Comenius University Mlynská dolina Ilkovičova 6 Bratislava SK‐84215 Slovakia
| | - Andrej Vrták
- Department of Chemical Theory of Drugs, Faculty of Pharmacy Comenius University Kalinčiakova 8 Bratislava SK‐83232 Slovakia
| | - Renáta Horáková
- Department of Chemical Theory of Drugs, Faculty of Pharmacy Comenius University Kalinčiakova 8 Bratislava SK‐83232 Slovakia
| | - Branislav Horváth
- NMR laboratory, Faculty of Pharmacy Comenius University Odbojárov 10 Bratislava SK‐83232 Slovakia
| | - Ferdinand Devínsky
- Faculty of Pharmacy Comenius University Odbojárov 10 Bratislava SK‐83232 Slovakia
| |
Collapse
|
8
|
Tan J, Cao F, Chen H, Liu K, Sun D. Aggregation properties of siloxane surfactants with phenyldimethylsiloxyl groups in aqueous solution. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111158] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
9
|
Surfactants with aromatic headgroups for optimizing properties of graphene/natural rubber latex composites (NRL): Surfactants with aromatic amine polar heads. J Colloid Interface Sci 2019; 545:184-194. [PMID: 30878784 DOI: 10.1016/j.jcis.2019.03.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 03/04/2019] [Accepted: 03/05/2019] [Indexed: 11/20/2022]
Abstract
HYPOTHESIS The compatibility of surfactants and graphene surfaces can be improved by increasing the number of aromatic groups in the surfactants. Including aniline in the structure may improve the compatibility between surfactant and graphene further still. Surfactants can be modified by incorporating aromatic groups in the hydrophobic chains or hydrophilic headgroups. Therefore, it is of interest to investigate the effects of employing anilinium based surfactants to disperse graphene nanoplatelets (GNPs) in natural rubber latex (NRL) for the fabrication of electrically conductive nanocomposites. EXPERIMENTS New graphene-philic surfactants carrying aromatic moieties in the hydrophilic headgroups and hydrophobic tails were synthesized by swapping the traditional sodium counterion with anilinium. 1H NMR spectroscopy was used to characterize the surfactants. These custom-made surfactants were used to assist the dispersion of GNPs in natural rubber latex matrices for the preparation of conductive nanocomposites. The properties of nanocomposites with the new anilinium surfactants were compared with commercial sodium surfactant sodium dodecylsulfate (SDS), sodium dodecylbenzenesulfonate (SDBS), and the previously synthesized aromatic tri-chain sodium surfactant TC3Ph3 (sodium 1,5-dioxo-1,5-bis(3-phenylpropoxy)-3-((3phenylpropoxy)carbonyl) pentane-2-sulfonate). Structural properties of the nanocomposites were studied using Raman spectroscopy, field emission scanning electron microscopy (FESEM), and high-resolution transmission electron microscopy (HRTEM). Electrical conductivity measurements and Zeta potential measurements were used to assess the relationships between total number of aromatic groups in the surfactant molecular structure and nanocomposite properties. The self-assembly structure of surfactants in aqueous systems and GNP dispersions was assessed using small-angle neutron scattering (SANS). FINDINGS Among these different surfactants, the anilinium version of TC3Ph3 namely TC3Ph3-AN (anilinium 1,5-dioxo-1,5-bis(3-phenylpropoxy)-3-((3phenylpropoxy)carbonyl) pentane-2-sulfonate) was shown to be highly efficient for dispersing GNPs in the NRL matrices, increasing electrical conductivity eleven orders of magnitude higher than the neat rubber latex. Comparisons between the sodium and anilinium surfactants show significant differences in the final properties of the nanocomposites. In general, the strategy of increasing the number of surfactant-borne aromatic groups by incorporating anilinium ions in surfactant headgroups appears to be effective.
Collapse
|
10
|
Gao S, Song Z, Zhu D, Lan F, Jiang Q. Synthesis, surface activities, and aggregation behavior of phenyl-containing carboxybetaine surfactants. RSC Adv 2018; 8:33256-33268. [PMID: 35548104 PMCID: PMC9086481 DOI: 10.1039/c8ra06217j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Accepted: 09/19/2018] [Indexed: 11/21/2022] Open
Abstract
A novel series of carboxybetaine surfactants were synthesized for the first time and their physicochemical properties were systematically investigated.
Collapse
Affiliation(s)
- Shifeng Gao
- State Key Laboratory of Heavy Oil Processing
- College of Science
- China University of Petroleum
- Beijing 102249
- PR China
| | - Zhaozheng Song
- State Key Laboratory of Heavy Oil Processing
- College of Science
- China University of Petroleum
- Beijing 102249
- PR China
| | - Di Zhu
- State Key Laboratory of Heavy Oil Processing
- College of Science
- China University of Petroleum
- Beijing 102249
- PR China
| | - Fang Lan
- State Key Laboratory of Heavy Oil Processing
- College of Science
- China University of Petroleum
- Beijing 102249
- PR China
| | - Qingzhe Jiang
- State Key Laboratory of Heavy Oil Processing
- College of Science
- China University of Petroleum
- Beijing 102249
- PR China
| |
Collapse
|
11
|
Taleb K, Mohamed-Benkada M, Benhamed N, Saidi-Besbes S, Grohens Y, Derdour A. Benzene ring containing cationic gemini surfactants: Synthesis, surface properties and antibacterial activity. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.06.008] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
12
|
Banipal PK, Arti S, Banipal TS. Influence of polyhydroxy compounds on the micellization behaviour of cetyltrimethylammonium bromide: Conductance and microcalorimetric investigations. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.09.037] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
13
|
Listunov D, Fabing I, Saffon-Merceron N, Gaspard H, Volovenko Y, Maraval V, Chauvin R, Génisson Y. Asymmetric Synthesis and Biological Evaluation of Natural or Bioinspired Cytotoxic C2-Symmetrical Lipids with Two Terminal Chiral Alkynylcarbinol Pharmacophores. J Org Chem 2015; 80:5386-94. [DOI: 10.1021/acs.joc.5b00494] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Dymytrii Listunov
- UPR
CNRS 8241, LCC, Université de Toulouse, 205 route de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, Université Paul Sabatier, INPT, F-31077 Toulouse, France
- Kiev National Taras Shevchenko University, 60 Volodymyrska Street, 01033 Kiev, Ukraine
- UMR
CNRS 5068, LSPCMIB, Université Paul Sabatier, 118 route de
Narbonne, Toulouse, 31062
Cedex 9, France
| | - Isabelle Fabing
- UMR
CNRS 5068, LSPCMIB, Université Paul Sabatier, 118 route de
Narbonne, Toulouse, 31062
Cedex 9, France
| | - Nathalie Saffon-Merceron
- Institut
de Chimie de Toulouse, ICT FR 2599, Université Paul Sabatier - Toulouse III, Toulouse 31062 Cedex 9, France
| | - Hafida Gaspard
- UMR
CNRS 5068, LSPCMIB, Université Paul Sabatier, 118 route de
Narbonne, Toulouse, 31062
Cedex 9, France
| | - Yulian Volovenko
- Kiev National Taras Shevchenko University, 60 Volodymyrska Street, 01033 Kiev, Ukraine
| | - Valérie Maraval
- UPR
CNRS 8241, LCC, Université de Toulouse, 205 route de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, Université Paul Sabatier, INPT, F-31077 Toulouse, France
| | - Remi Chauvin
- UPR
CNRS 8241, LCC, Université de Toulouse, 205 route de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, Université Paul Sabatier, INPT, F-31077 Toulouse, France
| | - Yves Génisson
- UMR
CNRS 5068, LSPCMIB, Université Paul Sabatier, 118 route de
Narbonne, Toulouse, 31062
Cedex 9, France
| |
Collapse
|
14
|
Mekala S, Hahn RC. Process intensification-assisted conversion of α,ω-alkanediols to dibromides. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2014.11.132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
15
|
Formation of polyion complex micelles with tunable isoelectric points based on zwitterionic block copolymers. Macromol Res 2013. [DOI: 10.1007/s13233-012-0177-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
16
|
Xia B, Zheng B, Han C, Dong S, Zhang M, Hu B, Yu Y, Huang F. A novel pH-responsive supramolecular polymer constructed by pillar[5]arene-based host–guest interactions. Polym Chem 2013. [DOI: 10.1039/c3py21110j] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
17
|
Roy A, Maiti M, Roy S. Spontaneous formation of vesicles by sodium 2-dodecylnicotinate in water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:12696-12703. [PMID: 22873175 DOI: 10.1021/la302484x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The surface activity and aggregation behavior of a synthesized nicotinic acid based anionic surfactant, sodium 2-dodecylnicotinate, were studied in aqueous solution. The self-assembly formation was investigated by use of a number of techniques, including surface tension and conductivity measurements, fluorescence spectroscopy, dynamic light scattering measurement, gel permeation chromatography, and microscopy. The amphiphile exhibits two breaks in the surface tension vs concentration plot, indicating stepwise aggregate formation and thus producing two values of the aggregation concentration. Stepwise aggregation of the amphiphile was further confirmed by steady-state fluorescence spectroscopy using pyrene as a probe molecule, and also the micropolarity of the aggregates was determined. The rigidity of the microenvironment was estimated by determining steady-state fluorescence anisotropy using 1,6-diphenyl-1,3,5-hexatriene as a fluorescence probe molecule. The average hydrodynamic radius and size distribution of the aggregate suggest formation of larger aggregates in aqueous solution. The formation of vesicles in water was established by conductivity measurement and a dye entrapment experiment. The entrapment of a small solute and the release capability have also been examined to demonstrate these bilayers form enclosed vesicles. Transmission electron micrographs revealed the existence of closed vesicles and closed tubules in aqueous solution. Therefore, for the first time, it has been observed that this simple single-chain nicotinic acid based amphiphile spontaneously assembles to vesicles in aqueous solution.
Collapse
Affiliation(s)
- Aparna Roy
- Department of Chemistry and Chemical Technology, Vidyasagar University, Paschim Medinipur-721 102, India
| | | | | |
Collapse
|
18
|
Ghai R, Falconer RJ, Collins BM. Applications of isothermal titration calorimetry in pure and applied research--survey of the literature from 2010. J Mol Recognit 2012; 25:32-52. [PMID: 22213449 DOI: 10.1002/jmr.1167] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Isothermal titration calorimetry (ITC) is a biophysical technique for measuring the formation and dissociation of molecular complexes and has become an invaluable tool in many branches of science from cell biology to food chemistry. By measuring the heat absorbed or released during bond formation, ITC provides accurate, rapid, and label-free measurement of the thermodynamics of molecular interactions. In this review, we survey the recent literature reporting the use of ITC and have highlighted a number of interesting studies that provide a flavour of the diverse systems to which ITC can be applied. These include measurements of protein-protein and protein-membrane interactions required for macromolecular assembly, analysis of enzyme kinetics, experimental validation of molecular dynamics simulations, and even in manufacturing applications such as food science. Some highlights include studies of the biological complex formed by Staphylococcus aureus enterotoxin C3 and the murine T-cell receptor, the mechanism of membrane association of the Parkinson's disease-associated protein α-synuclein, and the role of non-specific tannin-protein interactions in the quality of different beverages. Recent developments in automation are overcoming limitations on throughput imposed by previous manual procedures and promise to greatly extend usefulness of ITC in the future. We also attempt to impart some practical advice for getting the most out of ITC data for those researchers less familiar with the method.
Collapse
Affiliation(s)
- Rajesh Ghai
- Institute for Molecular Bioscience (IMB), University of Queensland, St. Lucia, Queensland, 4072, Australia
| | | | | |
Collapse
|
19
|
Wadekar MN, Boekhoven J, Jager WF, Koper GJM, Picken SJ. Micellization behavior of aromatic moiety bearing hybrid fluorocarbon sulfonate surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:3397-3402. [PMID: 22263549 DOI: 10.1021/la2047799] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Aggregation behavior and thermodynamic properties of two novel homologous aromatic moiety bearing hybrid fluorocarbon surfactants, sodium 2-(2-(4-ethylphenyl)-1,1,2,2-tetrafluoroethoxy)-1,1,2,2-tetrafluoroethanesulfonate (1) and sodium 2-(1,1,2,2-tetrafluoro-2-(4-vinylphenyl)ethoxy)-1,1,2,2-tetrafluoroethanesulfonate (2) were studied using surface tension measurements and isothermal titration calorimetry (ITC) in dilute aqueous solutions at room temperature. Because of the aromatic group in the hydrophobic tail, both surfactants are soluble at room temperature unlike their starting precursor, 5-iodooctafluoro-3-oxapentanesulfonate as well as several other fluorocarbon sulfonic acid salts. Moreover, the surfactant 2 has the ability that it can be polymerized once microemulsions are formed with it. The ionic conductivity measurements of 1 at five different temperatures from 288 to 313 K were carried out to study the effect of temperature on the micellization and its thermodynamics. The pseudophase separation model was applied to estimate thermodynamic quantities from conductivity data. The Gibbs energy of micellization versus temperature exhibited the characteristic U-shaped behavior with a minimum at 306 K. The micellization process was found to be largely entropy driven. Because of its hybrid structure, the entropy change of micellization for 1 was larger than what is common for hydrocarbon surfactants like SDS but less than for fully fluorinated surfactants like NaPFO. The micellization process was found to be following the entropy-enthalpy compensation phenomena.
Collapse
Affiliation(s)
- Mohan N Wadekar
- Nano-Structured Materials, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628BL Delft, The Netherlands
| | | | | | | | | |
Collapse
|
20
|
Matsuo T, Fujii S, Kamikawa Y, Nishimura T, Sanada Y, Mochizuki S, Sakurai K. Quaternary-ammonium-bearing Aromatic Surfactants: Effect of the Alkyl Chain Positions on Their Micelle and DNA-complex Structures. CHEM LETT 2011. [DOI: 10.1246/cl.2011.1340] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|