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Nandi S, Mukhopadhyay A, Nandi PK, Bera N, Hazra R, Chatterjee J, Sarkar N. Amyloids Formed by Nonaromatic Amino Acid Methionine and Its Cross with Phenylalanine Significantly Affects Phospholipid Vesicle Membrane: An Insight into Hypermethioninemia Disorder. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:8252-8265. [PMID: 35758025 DOI: 10.1021/acs.langmuir.2c00648] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The incorrect metabolic breakdown of the nonaromatic amino acid methionine (Met) leads to the disorder called hypermethioninemia via an unknown mechanism. To understand the molecular level pathogenesis of this disorder, we prepared a DMPC lipid membrane, the mimicking setup of the cell membrane, and explored the effect of the millimolar level of Met on it. We found that Met forms toxic fibrillar aggregates that disrupt the rigidity of the membrane bilayer, and increases the dynamic response of water molecules surrounding the membrane as well as the heterogeneity of the membrane. Such aggregates strongly deform red blood cells. This opens the requirement to consider therapeutic antagonists either to resist or to inhibit the toxic amyloid aggregates against hypermethioninemia. Moreover, such disrupting effect on membrane bilayer and cytotoxicity along with deformation effect on RBC by the cross amyloids of Met and Phenylalanine (Phe) was found to be most virulent. This exclusive observation of the enhanced virulent effect of the cross amyloids is expected to be an informative asset to explain the coexistence of two amyloid disorders.
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Hande VR, Chakrabarty S. How Far Is "Bulk Water" from Interfaces? Depends on the Nature of the Surface and What We Measure. J Phys Chem B 2022; 126:1125-1135. [PMID: 35104127 DOI: 10.1021/acs.jpcb.1c08603] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Using systematic molecular dynamics (MD) simulations, we revisit the question: At what distance from an interface do the properties of "bulk water" get recovered? We have considered three different kinds of interfaces: nonpolar (hydrophobic; isooctane-water interface), charged (negative; AOT bilayer), and polar (zwitterionic; POPC bilayer). In order to interrogate the extent of perturbation of the interfacial water molecules as a function of the distance from the interface, we utilize a diverse range of structural and dynamical parameters. To capture the structural perturbations, we look into local density (translational order), local tetrahedral order parameter, and dipolar orientation of the water molecules. We also explore the anisotropic diffusion of the water molecules in the direction perpendicular to the interface as well as the planar diffusion parallel to the interface in a distance dependent manner. In addition, the orientational time correlation functions have been computed to understand the extent of slowdown in the rotational dynamics. As expected, the electrostatic field emanating from the charged AOT interface seems to have the highest long-range effect on the orientational order and dynamics of the water molecules, whereas specific interactions like hydrogen bonding and electrostatic interaction lead to significant trapping and kinetic slowdown for both AOT and POPC (zwitterionic) very close to the interface. Our analysis highlights that not only the length-scale of perturbation depends on the nature of the interfaces and specific interactions but also the type of water property that we measure/calculate. Different water properties seem to have widely different length-scale of perturbation. Orientational order parameters seem to be perturbed to a much longer length-scale as compared to translational order parameters. The global orientational order of water can be perturbed even up to ∼4-5 nm near the negatively charged AOT surface in the absence of any extra electrolyte. This observation has significant implication toward the interpretation of experimental measurements as well since different spectroscopic techniques would probe different parameters or water properties with possible mutual disagreement and inconsistency between different types of measurements. Thus, our study provides a broader and unifying perspective toward the aspect of "context dependent" structural and dynamical perturbation of "interfacial water".
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Affiliation(s)
- Vrushali R Hande
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune 411008, Maharashtra, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Suman Chakrabarty
- Department of Chemical, Biological & Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Kolkata 700106, India
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Mondal D, Malik S, Banerjee P, Kundu N, Debnath A, Sarkar N. Modulation of Membrane Fluidity to Control Interfacial Water Structure and Dynamics in Saturated and Unsaturated Phospholipid Vesicles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:12423-12434. [PMID: 33035065 DOI: 10.1021/acs.langmuir.0c02736] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The structure and dynamics of interfacial water in biological systems regulate the biochemical reactions. But, it is still enigmatic how the behavior of the interfacial water molecule is controlled. Here, we have investigated the effect of membrane fluidity on the structure and dynamics of interfacial water molecules in biologically relevant phopholipid vesicles. This study delineates that modulation of membrane fluidity through interlipid separation and unsaturation not only mitigate membrane rigidity but also disrupt the strong hydrogen bond (H-bond) network around the lipid bilayer interface. As a result, a disorder in H-bonding between water molecules arises several layers beyond the first hydration shell of the polar headgroup, which essentially modifies the interfacial water structure and dynamics. Furthermore, we have also provided evidence of increasing transportation through these modulated membranes, which enhance the membrane mediated isomerization reaction rate.
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Affiliation(s)
- Dipankar Mondal
- Department of Chemistry, Indian Institute of Technology Kharagpur Kharagpur 721302, West Bengal, India
| | - Sheeba Malik
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur 342037, Rajasthan, India
| | - Pavel Banerjee
- Department of Chemistry, Indian Institute of Technology Kharagpur Kharagpur 721302, West Bengal, India
| | - Niloy Kundu
- Department of Chemistry, Indian Institute of Technology Kharagpur Kharagpur 721302, West Bengal, India
- Environment Research Group, R&D and Scientific Services Department, Tata Steel Ltd., Jamshedpur 831007, India
| | - Ananya Debnath
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur 342037, Rajasthan, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology Kharagpur Kharagpur 721302, West Bengal, India
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4
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Molecular aspects of the role of groove and stacked regions of DNA in binding with lipids: Spectroscopic and docking studies. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112672] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Nandi S, Pyne A, Ghosh M, Banerjee P, Ghosh B, Sarkar N. Antagonist Effects of l-Phenylalanine and the Enantiomeric Mixture Containing d-Phenylalanine on Phospholipid Vesicle Membrane. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:2459-2473. [PMID: 32073868 DOI: 10.1021/acs.langmuir.9b03543] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
One of the congenital flaws of metabolism, phenylketonuria (PKU), is known to be related to the self-assembly of toxic fibrillar aggregates of phenylalanine (Phe) in blood at elevated concentrations. Our experimental findings using l-phenylalanine (l-Phe) at millimolar concentration suggest the formation of fibrillar morphologies in the dry phase, which in the solution phase interact strongly with the model membrane composed of 1,2-diacyl-sn-glycero-phosphocholine (LAPC) lipid, thereby decreasing the rigidity (or increasing the fluidity) of the membrane. The hydrophobic interaction, in addition to the electrostatic attraction of Phe with the model membrane, is found to be responsible for such phenomena. On the contrary, various microscopic observations reveal that such fibrillar morphologies of l-Phe are severely ruptured in the presence of its enantiomer d-phenylalanine (d-Phe), thereby converting the fibrillar morphologies into crushed flakes. Various biophysical studies, including the solvation dynamics experiment, suggest that this l-Phe in the presence of d-Phe, when interacting with the same model membrane, now reverts the rigidity of the membrane, i.e., increases the rigidity of the membrane, which was lost due to interaction with l-Phe exclusively. Fluorescence anisotropy measurements also support this reverse rigid character of the membrane in the presence of an enantiomeric mixture of amino acids. A comprehensive understanding of the interaction of Phe with the model membrane is further pursued at the single-molecular fluorescence detection level using fluorescence correlation spectroscopy (FCS) experiments. Therefore, our experimental conclusion interprets a linear correlation between increased permeability and enhanced fluidity of the membrane in the presence of l-Phe and certifies d-Phe as a therapeutic modulator of l-Phe fibrillar morphologies. Further, the study proposes that the rigidity of the membrane lost due to interaction with l-Phe was reinstated-in fact, increased-in the presence of the enantiomeric mixture containing both d- and l-Phe.
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Spectroscopic investigation on alteration of dynamic properties of lipid membrane in presence of Gamma-Aminobutyric Acid (GABA). J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.111877] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Das A, Sharma G, Kamatham N, Prabhakar R, Sen P, Ramamurthy V. Ultrafast Solvation Dynamics Reveal that Octa Acid Capsule's Interior Dryness Depends on the Guest. J Phys Chem A 2019; 123:5928-5936. [PMID: 31276410 DOI: 10.1021/acs.jpca.9b04626] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Coumarins are well-known to exhibit environment-dependent excited-state behavior. We have exploited this feature to probe the accessibility of solvent water molecules to coumarins (guest) encapsulated within an organic capsule (host). Two sets of coumarins, one small that fits well within the capsule and the other larger that fits within an enlarged capsule, are used as guests. In our study, the two sets of coumarins serve different purposes: one is employed to explore electron transfer across the capsule and the other to release photoprotected acids into the aqueous environment. The capsule is made up of two molecules of octa acid (OA) and is soluble in an aqueous medium under slightly basic conditions. Molecular modeling studies revealed that while the OA capsule is fully closed with no access to water in the case of smaller coumarins, with the larger molecules, the capsule is not tight and the guest is in contact with water molecules, the number being dependent on the size of the coumarin. We have used the ultrafast time-dependent Stokes shift method to understand the solvent dynamics around the above guest molecules encapsulated within an OA capsule in an aqueous medium. Results depict that for the smaller sets of coumarins, water cannot access the guests within the OA cavity during their excited state lifetime. However, the case is completely different for the larger coumaryl esters. Distorted capsule structure exposes the guest to water, and a dynamics Stokes shift is observed. The average solvation time decreases with the increasing size of guests that clearly indicates accessibility of the encapsulated guests toward greater number of water molecules as the capsule structure distorts with increasing size of the guests. Results of the ultrafast solvation dynamics are consistent with that of molecular dynamics simulation.
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Affiliation(s)
- Aritra Das
- Department of Chemistry , Indian Institute of Technology Kanpur , Kanpur 208016 , India
| | - Gaurav Sharma
- Department of Chemistry , University of Miami , Coral Gables , Florida 33146 , United States
| | - Nareshbabu Kamatham
- Department of Chemistry , University of Miami , Coral Gables , Florida 33146 , United States
| | - Rajeev Prabhakar
- Department of Chemistry , University of Miami , Coral Gables , Florida 33146 , United States
| | - Pratik Sen
- Department of Chemistry , Indian Institute of Technology Kanpur , Kanpur 208016 , India
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Thomaz JE, Kramer PL, Fica-Contreras SM, Hoffman DJ, Fayer MD. Reorientation-induced Stokes shifts caused by directional interactions in electronic spectroscopy: Fast dynamics of poly(methyl methacrylate). J Chem Phys 2019; 150:194201. [PMID: 31117782 DOI: 10.1063/1.5094806] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Dynamic Stokes shift measurements report on structural relaxation, driven by a dipole created in a chromophore by its excitation from the ground electronic state to the S1 state. Here, we demonstrate that it is also possible to have an additional contribution from orientational relaxation of the Stokes shift chromophore. This effect, called reorientation-induced Stokes shift (RISS), can be observed when the reorientation of the chromophore and the solvent structural relaxation occur on similar time scales. Through a vector interaction, the electronic transition of the chromophore couples to its environment. The orientational diffusive motions of the chromophores will have a slight bias toward reducing the transition energy (red shift) as do the solvent structural diffusive motions. RISS is manifested in the polarization-dependence of the fluorescence Stokes shift using coumarin 153 (C153) in poly(methyl methacrylate) (PMMA). A similar phenomenon, reorientation-induced spectral diffusion (RISD), has been observed and theoretically explicated in the context of two dimensional infrared (2D IR) experiments. Here, we generalize the existing RISD theory to include properties of electronic transitions that generally are not present in vibrational transitions. Expressions are derived that permit determination of the structural dynamics by accounting for the RISS contributions. Using these generalized equations, the structural dynamics of the medium can be measured for any system in which the directional interaction is well represented by a first order Stark effect and RISS or RISD is observed. The theoretical results are applied to the PMMA data, and the structural dynamics are obtained and discussed.
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Affiliation(s)
- Joseph E Thomaz
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
| | - Patrick L Kramer
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
| | | | - David J Hoffman
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
| | - Michael D Fayer
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
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Jimenez CJ, Tan J, Dowell KM, Gadbois GE, Read CA, Burgess N, Cervantes JE, Chan S, Jandaur A, Karanik T, Lee JJ, Ley MC, McGeehan M, McMonigal A, Palazzo KL, Parker SA, Payman A, Soria M, Verheyden L, Vo VT, Yin J, Calkins AL, Fuller AA, Stokes GY. Peptoids advance multidisciplinary research and undergraduate education in parallel: Sequence effects on conformation and lipid interactions. Biopolymers 2019; 110:e23256. [PMID: 30633339 PMCID: PMC6590334 DOI: 10.1002/bip.23256] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 12/17/2018] [Accepted: 12/21/2018] [Indexed: 01/05/2023]
Abstract
Peptoids are versatile peptidomimetic molecules with wide-ranging applications from drug discovery to materials science. An understanding of peptoid sequence features that contribute to both their three-dimensional structures and their interactions with lipids will expand functions of peptoids in varied fields. Furthermore, these topics capture the enthusiasm of undergraduate students who prepare and study diverse peptoids in laboratory coursework and/or in faculty led research. Here, we present the synthesis and study of 21 peptoids with varied functionality, including 19 tripeptoids and 2 longer oligomers. We observed differences in fluorescence spectral features for 10 of the tripeptoids that correlated with peptoid flexibility and relative positioning of chromophores. Interactions of representative peptoids with sonicated glycerophospholipid vesicles were also evaluated using fluorescence spectroscopy. We observed evidence of conformational changes effected by lipids for select peptoids. We also summarize our experiences engaging students in peptoid-based projects to advance both research and undergraduate educational objectives in parallel.
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Affiliation(s)
- Christian J. Jimenez
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Jiacheng Tan
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Kalli M. Dowell
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Gillian E. Gadbois
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Cameron A. Read
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Nicole Burgess
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Jesus E. Cervantes
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Shannon Chan
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Anmol Jandaur
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Tara Karanik
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Jaenic J. Lee
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Mikaela C. Ley
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Molly McGeehan
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Ann McMonigal
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Kira L. Palazzo
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Samantha A. Parker
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Andre Payman
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Maritza Soria
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Lauren Verheyden
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Vivian T. Vo
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Jennifer Yin
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Anna L. Calkins
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Amelia A. Fuller
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
| | - Grace Y. Stokes
- Department of Chemistry & BiochemistrySanta Clara UniversitySanta ClaraCaliforniaU.S.A.
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Mondal D, Dutta R, Banerjee P, Mukherjee D, Maiti TK, Sarkar N. Modulation of Membrane Fluidity Performed on Model Phospholipid Membrane and Live Cell Membrane: Revealing through Spatiotemporal Approaches of FLIM, FAIM, and TRFS. Anal Chem 2019; 91:4337-4345. [PMID: 30821145 DOI: 10.1021/acs.analchem.8b04044] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have elucidated the role of unsaturated fatty acid in the in vitro model phospholipid membrane and in vivo live cell membrane. Fluorescence microscopy and time-resolved fluorescence spectroscopy have been employed to uncover how modulation of vesicle bilayer fluidity persuades structural transformation. This unsaturation induced structural transformation due to packing disorder in bilayer has been delineated through spatially resolved fluorescence lifetime imaging microscopy (FLIM) and fluorescence polarization or anisotropy imaging microscopy (FPIM/FAIM). Structure-function relationship of phospholipid vesicle is also investigated by monitoring intervesicular water dynamics behavior, which has been demonstrated by temporally resolved fluorescence spectroscopy (TRFS) techniques. Nevertheless, it has also been manifested from this study that loss of rigidity in bilayer breaks down the strong hydrogen bond (H-bond) network around the charged lipid head groups. The disruption of this H-bond network increases the bilayer elasticity, which helps to evolve various kinds of vesicular structure. Furthermore, the significant influence of unsaturated fatty acid on membrane bilayer has been ratified through in vivo live cell imaging.
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Affiliation(s)
- Dipankar Mondal
- Department of Chemistry , Indian Institute of Technology , Kharagpur 721302 , West Bengal , India
| | - Rupam Dutta
- Department of Chemistry , Indian Institute of Technology , Kharagpur 721302 , West Bengal , India
| | - Pavel Banerjee
- Department of Chemistry , Indian Institute of Technology , Kharagpur 721302 , West Bengal , India
| | - Devdeep Mukherjee
- Department of Biotechnology , Indian Institute of Technology , Kharagpur 721302 , West Bengal , India
| | - Tapas Kumar Maiti
- Department of Biotechnology , Indian Institute of Technology , Kharagpur 721302 , West Bengal , India
| | - Nilmoni Sarkar
- Department of Chemistry , Indian Institute of Technology , Kharagpur 721302 , West Bengal , India
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Benjamin I. Chemical Reaction Dynamics at Liquid Interfaces: A Computational Approach. PROGRESS IN REACTION KINETICS AND MECHANISM 2019. [DOI: 10.3184/007967402103165360] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Recent advances in experimental and theoretical studies of liquid interfaces provide remarkable evidence for the unique properties of these systems. In this review we examine how these properties affect the thermodynamics and kinetics of chemical reactions which take place at the liquid/vapor interface and at the liquid/liquid interface. We demonstrate how the rapidly varying density and viscosity, the marked changes in polarity and the surface roughness manifest themselves in isomerization, electron transfer and photodissociation reactions.
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Affiliation(s)
- Ilan Benjamin
- Department of Chemistry, University of California, Santa Cruz, California 95064, USA
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Kundu N, Banik D, Sarkar N. Self-Assembly of Amphiphiles into Vesicles and Fibrils: Investigation of Structure and Dynamics Using Spectroscopy and Microscopy Techniques. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:11637-11654. [PMID: 29544249 DOI: 10.1021/acs.langmuir.7b04355] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Amphiphiles are a class of molecules which are known to assemble into a variety of nanostructures. The understanding and applications of self-assembled systems are based on what has been learned from biology. Among the vast number of self-assemblies, in this article, we have described the formation, characterization, and dynamics of two important biologically inspired assemblies: vesicles and fibrils. Vesicles, which can be classified into several categories depending on the sizes and components, are of great interest due to their potential applications in drug delivery and as nanoscale reactors. The structure and dynamics of vesicles can also mimic the complex geometry of the cell membrane. On the other hand, the self-assembly of proteins, peptides, and even single amino acids leads to a number of degenerative disorders. Thus, a complete understanding of these self-assembled systems is necessary. In this article, we discuss recent work on vesicular aggregates composed of phospholipids, fatty acids, and ionic as well as nonionic surfactants and single amino acid-based fibrils such as phenylalanine and tyrosine. Beside the characterization, we also emphasize the excited-state dynamics inside the aggregates for a proper understanding of the organization, reactivity, and heterogeneity of the aggregates.
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Affiliation(s)
- Niloy Kundu
- Department of Chemistry , Indian Institute of Technology , Kharagpur 721302 , WB India
| | - Debasis Banik
- Department of Chemistry , Indian Institute of Technology , Kharagpur 721302 , WB India
| | - Nilmoni Sarkar
- Department of Chemistry , Indian Institute of Technology , Kharagpur 721302 , WB India
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Kumari S, Sonu, Sundar G, Saha SK. Effect of organic and a Hofmeister series of inorganic counterions on the solvation dynamics and rotational relaxation in aqueous micelles of hexadecyltrimethylammonium surfactants. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.05.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Bagchi D, Dutta S, Singh P, Chaudhuri S, Pal SK. Essential Dynamics of an Effective Phototherapeutic Drug in a Nanoscopic Delivery Vehicle: Psoralen in Ethosomes for Biofilm Treatment. ACS OMEGA 2017; 2:1850-1857. [PMID: 30023647 PMCID: PMC6044814 DOI: 10.1021/acsomega.7b00187] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Accepted: 04/28/2017] [Indexed: 05/18/2023]
Abstract
Appropriate localization of a drug and its structure/functional integrity in a delivery agent essentially dictates the efficacy of the vehicle and the medicinal activity of the drug. In the case of a phototherapeutic drug, its photoinduced dynamics becomes an added parameter. Here, we have explored the photoinduced dynamical events of a model phototherapeutic drug psoralen (PSO) in a potential delivery vehicle called an ethosome. Dynamic light scattering confirms the structural integrity of the ethosome vehicle after the encapsulation of PSO. Steady state and picosecond resolved polarization gated spectroscopy, including the well-known strategy of solvation and Förster resonance energy transfer, reveal the localization of the drug in the vehicle and the environment in the proximity of PSO. We have also investigated the efficacy of drug delivery to various individual bacteria (Gram-negative: Escherichia coli; Gram-positive: Staphylococcus aureus) and bacterial biofilms. Our optical and electron microscopic studies reveal a significant reduction in bacterial survival (∼70%) and the destruction of bacterial adherence following a change in the morphology of the biofilms after phototherapy. Our studies are expected to find relevance in the formulation of drug delivery agents in several skin diseases and biofilm formation in artificial implants.
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Affiliation(s)
| | | | | | | | - Samir Kumar Pal
- E-mail: . Telephone: +91 033 2335 5706-08. Fax: +91 033
2335 3477
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15
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Tabaei SR, Gillissen JJJ, Cho NJ. Probing Membrane Viscosity and Interleaflet Friction of Supported Lipid Bilayers by Tracking Electrostatically Adsorbed, Nano-Sized Vesicles. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:6338-6344. [PMID: 27689775 DOI: 10.1002/smll.201601561] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Indexed: 06/06/2023]
Abstract
Particle tracking is used to measure the diffusional motion of nanosized (≈100 nm), lipid vesicles that are electrostatically adsorbed onto a solid supported lipid bilayer. It is found that the motion of membrane-adhering vesicles is Brownian and depends inversely on the vesicle size, but is insensitive to the vesicle surface charge. The measured diffusivity agrees well with the Evans-Sackmann model for the diffusion of inclusions in supported, fluidic membranes. The agreement implies that the vesicle motion is coupled to that of a nanoscopic lipid cluster in the upper leaflet, which slides over the lower leaflet. The diffusivity of membrane-adhering vesicles is therefore predominantly governed by the interleaflet friction coefficient, while the diffusivity of single lipids is mainly governed by the membrane viscosity. Combined with fluorescence recovery after photobleaching analysis, the interleaflet friction coefficient and the membrane viscosity are determined by applying the Evans-Sackmann model to the measured diffusivity of membrane adhering vesicles and that of supported membrane lipids. This approach provides an alternative to existing methods for measuring the interleaflet friction coefficient and the membrane viscosity.
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Affiliation(s)
- Seyed R Tabaei
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Drive, Singapore, 637553, Singapore
| | - Jurriaan J J Gillissen
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Drive, Singapore, 637553, Singapore
| | - Nam-Joon Cho
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Drive, Singapore, 637553, Singapore
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore
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Tabaei SR, Gillissen JJJ, Kim MC, Ho JCS, Liedberg B, Parikh AN, Cho NJ. Brownian Dynamics of Electrostatically Adhering Small Vesicles to a Membrane Surface Induces Domains and Probes Viscosity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:5445-5450. [PMID: 27164321 DOI: 10.1021/acs.langmuir.6b00985] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Using single-particle tracking, we investigate the interaction of small unilamellar vesicles (SUVs) that are electrostatically tethered to the freestanding membrane of a giant unilamellar vesicle (GUV). We find that the surface mobility of the GUV-riding SUVs is Brownian, insensitive to the bulk viscosity, vesicle size, and vesicle fluidity but strongly altered by the viscosity of the underlying membrane. Analyzing the diffusional behavior of SUVs within the Saffman-Delbrück model for the dynamics of membrane inclusions supports the notion that the mobility of the small vesicles is coupled to that of dynamically induced lipid clusters within the target GUV membrane. The reversible binding also offers a nonperturbative means for measuring the viscosity of biomembranes, which is an important parameter in cell physiology and function.
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Affiliation(s)
- Seyed R Tabaei
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue 639798, Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive 637553, Singapore
| | - Jurriaan J J Gillissen
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue 639798, Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive 637553, Singapore
| | - Min Chul Kim
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue 639798, Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive 637553, Singapore
| | - James C S Ho
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue 639798, Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive 637553, Singapore
| | - Bo Liedberg
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue 639798, Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive 637553, Singapore
| | - Atul N Parikh
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue 639798, Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive 637553, Singapore
- Department of Biomedical Engineering and Department of Chemical Engineering and Materials Science, University of California , Davis, California 95616, United States
| | - Nam-Joon Cho
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue 639798, Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive 637553, Singapore
- School of Chemical and Biomedical Engineering, Nanyang Technological University , 62 Nanyang Drive 637459, Singapore
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17
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Xu J, Chen J, Dong S, Fu A, Li H, Chu T. Excited-state hydrogen bond strengthening of coumarin 153 in ethanol solvent: a TDDFT study. J PHYS ORG CHEM 2016. [DOI: 10.1002/poc.3537] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Jinmei Xu
- College of Information Science and Engineering; Ocean University of China; Qingdao 266100 China
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian 116023 China
| | - Junsheng Chen
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian 116023 China
| | - Shunle Dong
- College of Information Science and Engineering; Ocean University of China; Qingdao 266100 China
| | - Aiping Fu
- Institute for Computational Sciences and Engineering, Laboratory of New Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory and College of Physics, College of Chemistry; Qingdao University; Qingdao 266071 People's Republic of China
| | - Hongliang Li
- Institute for Computational Sciences and Engineering, Laboratory of New Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory and College of Physics, College of Chemistry; Qingdao University; Qingdao 266071 People's Republic of China
| | - Tianshu Chu
- Institute for Computational Sciences and Engineering, Laboratory of New Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory and College of Physics, College of Chemistry; Qingdao University; Qingdao 266071 People's Republic of China
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian 116023 China
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18
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Gobrogge CA, Kong VA, Walker RA. Temperature Dependent Solvation and Partitioning of Coumarin 152 in Phospholipid Membranes. J Phys Chem B 2015; 120:1805-12. [DOI: 10.1021/acs.jpcb.5b09505] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Christine A. Gobrogge
- Department of Chemistry and
Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Victoria A. Kong
- Department of Chemistry and
Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Robert A. Walker
- Department of Chemistry and
Biochemistry, Montana State University, Bozeman, Montana 59717, United States
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19
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Roy B, Satpathi S, Gavvala K, Koninti RK, Hazra P. Solvation Dynamics in Different Phases of the Lyotropic Liquid Crystalline System. J Phys Chem B 2015; 119:11721-31. [PMID: 26258397 DOI: 10.1021/acs.jpcb.5b04370] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Reverse hexagonal (HII) liquid crystalline material based on glycerol monooleate (GMO) is considered as a potential carrier for drugs and other important biomolecules due to its thermotropic phase change and excellent morphology. In this work, the dynamics of encapsulated water, which plays important role in stabilization and formation of reverse hexagonal mesophase, has been investigated by time dependent Stokes shift method using Coumarin-343 as a solvation probe. The formation of the reverse hexagonal mesophase (HII) and transformation to the L2 phase have been monitored using small-angle X-ray scattering and polarized light microscopy experiments. REES studies suggest the existence of different polar regions in both HII and L2 systems. The solvation dynamics study inside the reverse hexagonal (HII) phase reveals the existence of two different types of water molecules exhibiting dynamics on a 120-900 ps time scale. The estimated diffusion coefficients of both types of water molecules obtained from the observed dynamics are in good agreement with the measured diffusion coefficient collected from the NMR study. The calculated activation energy is found to be 2.05 kcal/mol, which is associated with coupled rotational-translational water relaxation dynamics upon the transition from "bound" to "quasi-free" state. The observed ∼2 ns faster dynamics of the L2 phase compared to the HII phase may be associated with both the phase transformation as well as thermotropic effect on the relaxation process. Microviscosities calculated from time-resolved anisotropy studies infer that the interface is almost ∼22 times higher viscous than the central part of the cylinder. Overall, our results reveal the unique dynamical features of water inside the cylinder of reverse hexagonal and inverse micellar phases.
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Affiliation(s)
- Bibhisan Roy
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
| | - Sagar Satpathi
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
| | - Krishna Gavvala
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
| | - Raj Kumar Koninti
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
| | - Partha Hazra
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
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20
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Banik D, Roy A, Kundu N, Sarkar N. Picosecond Solvation and Rotational Dynamics: An Attempt to Reinvestigate the Mystery of Alcohol–Water Binary Mixtures. J Phys Chem B 2015; 119:9905-19. [PMID: 26121323 DOI: 10.1021/acs.jpcb.5b04931] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Debasis Banik
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Arpita Roy
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Niloy Kundu
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
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21
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Sonu, Kumari S, Saha SK. Effect of Polymethylene Spacer of Cationic Gemini Surfactants on Solvation Dynamics and Rotational Relaxation of Coumarin 153 in Aqueous Micelles. J Phys Chem B 2015; 119:9751-63. [PMID: 26107156 DOI: 10.1021/acs.jpcb.5b03081] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The present work demonstrates the solvation dynamics and rotational relaxation of Coumarin 153 (C-153) in the micelles of a series of cationic gemini surfactants, 12-s-12, 2Br(-) containing a hydrophobic polymethylene spacer with s = 3, 4, 6, 8, 12. Steady-state and time-correlated single-photon counting (TCSPC) fluorescence spectroscopic techniques have been used to carry out this study. Steady-state and TCSPC fluorescence data suggest that C-153 molecules are located at the Stern layer of micelles. While probe molecules feel more or less the same micropolarity in the micellar phase, the microviscosity of micelles decreases with spacer chain length. Solvation dynamics at the Stern layer is bimodal in nature with fast solvation as a major component. Counter ions and water molecules bonded with the polar headgroups of surfactant molecules are responsible for the slow component. Average solvation time increases with spacer chain length because of the increased degree of counter ion dissociation. Some water molecules are involved in the solvation of counter ions themselves, resulting in the decrease in "free" water molecules to be available for the solvation of C-153. The hydrophobic spacer chain also has an effect on increasing the solvation time with increasing chain length. The average rotational relaxation time for C-153 decreases with spacer chain length with a rapid decrease at s > 4. The anisotropy decay of C-153 in micelles is biexponential in nature. The slow rotational relaxation is due to the lateral diffusion of C-153 in micelles. Lateral diffusion is much faster than the rotational motion of a micelle as a whole. The rotational motion of the micelle as a whole becomes faster with the decreasing size of micelles.
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Kuchlyan J, Banik D, Roy A, Kundu N, Sarkar N. Vesicles Formation by Zwitterionic Micelle and Poly-l-lysine: Solvation and Rotational Relaxation Study. J Phys Chem B 2015; 119:8285-92. [PMID: 26053544 DOI: 10.1021/acs.jpcb.5b02893] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jagannath Kuchlyan
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Debasis Banik
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Arpita Roy
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Niloy Kundu
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Nilmoni Sarkar
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
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23
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Banik D, Kundu N, Kuchlyan J, Roy A, Banerjee C, Ghosh S, Sarkar N. Picosecond solvation dynamics—A potential viewer of DMSO—Water binary mixtures. J Chem Phys 2015; 142:054505. [DOI: 10.1063/1.4906541] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Debasis Banik
- Department of Chemistry, Indian Institute of Technology, Kharagpur, WB 721302, India
| | - Niloy Kundu
- Department of Chemistry, Indian Institute of Technology, Kharagpur, WB 721302, India
| | - Jagannath Kuchlyan
- Department of Chemistry, Indian Institute of Technology, Kharagpur, WB 721302, India
| | - Arpita Roy
- Department of Chemistry, Indian Institute of Technology, Kharagpur, WB 721302, India
| | - Chiranjib Banerjee
- Department of Chemistry, Indian Institute of Technology, Kharagpur, WB 721302, India
| | - Surajit Ghosh
- Department of Chemistry, Indian Institute of Technology, Kharagpur, WB 721302, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur, WB 721302, India
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24
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Ghosh R, Banerjee S, Hazra M, Roy S, Bagchi B. Sensitivity of polarization fluctuations to the nature of protein-water interactions: Study of biological water in four different protein-water systems. J Chem Phys 2014; 141:22D531. [DOI: 10.1063/1.4902821] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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25
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Ukpebor OT, Shah A, Bazov E, Boutis GS. Inverse temperature transition of elastin like motifs in major ampullate dragline silk: MD simulations of short peptides and NMR studies of water dynamics. SOFT MATTER 2014; 10:773-785. [PMID: 24511323 PMCID: PMC3914981 DOI: 10.1039/c3sm52001c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Using deuterium 2D T1 − T2 Inverse Laplace Transform (ILT) NMR, we have investigated the distribution, population, and dynamics of waters of hydration in major ampullate N. clavipes and A. aurantia silk as a function of temperature. In both samples studied, correlation times much larger than that of free water are measured, and in some cases, appear to increase with increasing temperature over the range of 5 to 60 °C (corresponding to reduced tumbling). In addition, the experimental data point to a reduction in the population of water localized in the silk with increasing temperature in the range of 20 to 50 °C. Molecular dynamics simulations were performed to probe the thermal characteristics of a variety of repeating motifs found in the two silk samples. The repeating motifs GLGSQ, GAAAAAAG, GPGGY, GPGQQ, GPSG, and GPSGPGS found in N. clavipes, GLGSQ, GYGSG, GPGSG, and GPGSQ found in A. aurantia silk were found to exhibit a thermal property observed in short elastin peptides known as the "inverse temperature transition". This is a well known characteristic exhibited by short peptides consisting of (VPGXG)n motifs (where X is any amino acid other than proline) found in elastin--a protein responsible for the elasticity of vertebrate tissues. In qualitative agreement with experimental measurements of water in the silks, all the peptides studied in simulation show evidence of an increase in sidechain contacts and peptide hydrogen bonds, concomitant with a decrease in radius of gyration and localized water as the temperature is raised from approximately 5 to 60 °C.
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26
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Ghosh S, Ghatak C, Banerjee C, Mandal S, Kuchlyan J, Sarkar N. Spontaneous transition of micelle-vesicle-micelle in a mixture of cationic surfactant and anionic surfactant-like ionic liquid: a pure nonlipid small unilamellar vesicular template used for solvent and rotational relaxation study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:10066-10076. [PMID: 23859437 DOI: 10.1021/la402053a] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The micelle-vesicle-micelle transition in aqueous mixtures of the cationic surfactant cetyl trimethyl ammonium bromide (CTAB) and the anionic surfactant-like ionic liquid 1-butyl-3-methylimidazolium octyl sulfate, [C4mim][C8SO4] has been investigated by using dynamic light scattering (DLS), transmission electron microscopy (TEM), surface tension, conductivity, and fluorescence anisotropy at different volume fractions of surfactant. The surface tension value decreases sharply with increasing CTAB concentration up to ∼0.38 volume fraction and again increases up to ∼0.75 volume fraction of CTAB. Depending upon their relative amount, these surfactants either mixed together to form vesicles and/or micelles, or both of these structures were in equilibrium. Fluorescence anisotropy of 1,6-diphenyl-1,3,5-hexatriene (DPH), incorporated in this system at different composition of surfactant indicates the formation of micelle and vesicle structures. The apparent hydrodynamic diameter of these large multilamellar vesicles is about ∼200 nm-300 nm obtained by DLS measurement and finally confirmed by TEM micrographs. The large multilamellar vesicles are transformed into small unilamellar ones by sonication using a Lab-line instruments probe sonicator with a diameter of ∼90-125 nm. To investigate the heterogeneity, solvent, and rotational relaxation of coumarin-153 (C-153) have been investigated in these unilamellar vesicles by using picosecond time-resolved fluorescence spectroscopic technique. The solvation dynamics of C-153 in these vesicles is found to be biexponential with average time constant ∼580 ps. This indicates the slow relaxation of water molecules in the surfactant bilayer. In accordance with solvation dynamics, fluorescence anisotropy analysis of C-153 in unilamellar vesicles also indicates hindered rotation compared to bulk water.
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Affiliation(s)
- Surajit Ghosh
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
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27
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Jiang LL, Liu WL, Song YF, He X, Wang Y, Wu HL, Yang YQ. Solvent Effects on Spectral Property and Dipole Moment of the Lowest Excited State of Coumarin 343 Dye. CHINESE J CHEM PHYS 2012. [DOI: 10.1088/1674-0068/25/05/577-584] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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28
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Verma P, Pal H. Intriguing H-Aggregate and H-Dimer Formation of Coumarin-481 Dye in Aqueous Solution As Evidenced from Photophysical Studies. J Phys Chem A 2012; 116:4473-84. [DOI: 10.1021/jp210433f] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Haridas Pal
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
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29
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Nishiyama K, Takata K, Watanabe K, Shigematsu H. Solvation dynamics of coumarin 153 embedded in AOT+phenol organogels studied by time-resolved fluorescence spectroscopy. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.01.050] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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30
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Ge L, Vernon M, Simon S, Maham Y, Sjöblom J, Xu Z. Interactions of divalent cations with tetrameric acid aggregates in aqueous solutions. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2011.12.074] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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31
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Anand U, Jash C, Mukherjee S. Spectroscopic determination of Critical Micelle Concentration in aqueous and non-aqueous media using a non-invasive method. J Colloid Interface Sci 2011; 364:400-6. [DOI: 10.1016/j.jcis.2011.08.047] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2011] [Revised: 08/07/2011] [Accepted: 08/22/2011] [Indexed: 10/17/2022]
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32
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Ghatak C, Rao VG, Ghosh S, Mandal S, Sarkar N. Solvation Dynamics and Rotational Relaxation Study Inside Niosome, A Nonionic Innocuous Poly(ethylene Glycol)-Based Surfactant Assembly: An Excitation Wavelength Dependent Experiment. J Phys Chem B 2011; 115:12514-20. [DOI: 10.1021/jp204473d] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Chiranjib Ghatak
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Vishal Govind Rao
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Shirsendu Ghosh
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Sarthak Mandal
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
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33
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Dhenadhayalan N, Selvaraju C, Ramamurthy P. Photoionization and Time-Dependent Stokes Shift of Coumarin 307 in Soft Matter: Solvation and Radical-Ion Pair Recombination Dynamics. J Phys Chem B 2011; 115:10892-902. [DOI: 10.1021/jp203092c] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Chellappan Selvaraju
- National Centre for Ultrafast Processes, University of Madras, Chennai- 600 113, India
| | - Perumal Ramamurthy
- National Centre for Ultrafast Processes, University of Madras, Chennai- 600 113, India
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34
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Sarma N, Borah JM, Mahiuddin S, Gazi HAR, Guchhait B, Biswas R. Influence of Chain Length of Alcohols on Stokes’ Shift Dynamics in Catanionic Vesicles. J Phys Chem B 2011; 115:9040-9. [DOI: 10.1021/jp201402h] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Namrata Sarma
- Materials Science Division, North-East Institute of Science and Technology, CSIR, Jorhat 785006, Assam, India
| | - Jayanta M. Borah
- Materials Science Division, North-East Institute of Science and Technology, CSIR, Jorhat 785006, Assam, India
| | - Sekh Mahiuddin
- Materials Science Division, North-East Institute of Science and Technology, CSIR, Jorhat 785006, Assam, India
| | - Harun Al Rasid Gazi
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India
| | - Biswajit Guchhait
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India
| | - Ranjit Biswas
- Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India
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35
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Mishra PP, Pigga J, Liu T. Membranes Based on “Keplerate”-Type Polyoxometalates: Slow, Passive Cation Transportation and Creation of Water Microenvironment. J Am Chem Soc 2008; 130:1548-9. [DOI: 10.1021/ja077715n] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Padmaja P. Mishra
- Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015
| | - Joe Pigga
- Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015
| | - Tianbo Liu
- Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015
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36
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Sen P, Ghosh S, Mondal SK, Sahu K, Roy D, Bhattacharyya K, Tominaga K. A femtosecond study of excitation-wavelength dependence of solvation dynamics in a vesicle. Chem Asian J 2007; 1:188-94. [PMID: 17441054 DOI: 10.1002/asia.200600036] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The dependence of fluorescence and solvation dynamics of coumarin 480 (C480) in a dimyristoyl-phosphatidylcholine (DMPC) vesicle on excitation wavelength (lambda(ex)) was studied with femtosecond fluorescence upconversion. The study revealed an ultrafast 1.5-ps component of solvation that was not detected earlier. C480 exhibits pronounced red-edge excitation shift (REES) by 10 nm in a DMPC vesicle. This is due to the microheterogeneity of the lipid vesicle. In lipids, the probe is distributed in different locations with varying static and dynamic electrostatic responses. Solvent relaxation becomes faster and the amount of dynamic Stokes shift decreases with increasing lambda(ex). For excitation at the red end (lambda(ex) = 430 nm), the solvation time was found to be 1.5 ps. However, for excitation at the blue end, (lambda(ex) = 390 nm), there are two substantially slower components of 250 and 2000 ps. It seems that for lambda(ex) = 390 nm, the major contribution to total emission is due to the probe (C480) molecules in the hydrophobic and restricted locations inside the lipid bilayer. Excitation at 430 nm preferentially selects the probe molecules in a highly mobile environment (water pool of the lipid).
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Affiliation(s)
- Pratik Sen
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
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37
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Kumbhakar M, Nath S, Mukherjee T, Pal H. Solvation dynamics in triton-X-100 and triton-X-165 micelles: effect of micellar size and hydration. J Chem Phys 2006; 121:6026-33. [PMID: 15367031 DOI: 10.1063/1.1784774] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Dynamic Stokes' shift measurements using coumarin 153 as the fluorescence probe have been carried out to study solvation dynamics in two nonionic micelles, viz., triton-X-100 (TX-100) and triton-X-165 (TX-165). In both the micelles, the solvent relaxation dynamics is biexponential in nature. While the fast solvation time tau(s1) is seen to be almost similar for both the micelles, the slow solvation time tau(s2) is found to be appreciably smaller in TX-165 than in TX-100 micelle. Dynamic light scattering measurements indicate that the TX-165 micelles are substantially smaller in size than that of TX-100. Assuming similar core size for both the micelles, as expected from the similar chemical structures of the nonpolar ends for both the surfactants, the Palisade layer is also indicated to be substantially thinner for TX-165 micelles than that of TX-100. The aggregation number of TX-165 micelles is also found to be substantially smaller than that of TX-100 micelles. Fluorescence spectral studies of C153 dye in the two micelles indicate that the Palisade layer of TX-165 micelles is more polar than that of TX-100 micelles. Fluorescence anisotropy measurements indicate that the microviscosity in the Palisade layer of TX-165 micelles is also lower than that of TX-100 micelles. Based on these results it is inferred that the structure of the Palisade layer of TX-165 micelles is quite loose and have higher degree hydration in comparison to that of TX-100 micelles. Due to these structural differences in the Palisade layers of TX-165 and TX-100 micelles the solvation dynamics is faster in the former micelles than in the latter. It has been further inferred that in the present systems the collective response of the water molecules at somewhat away from the probes is responsible for the faster component of the solvation time, which does not reflect much of the structural changes of the micellar Palisade layer. On the contrary, the slower solvation time component, which is mainly due to the single particle response arising from water molecules adjacent to the probe in the micellar Palisade layer, is largely affected by the structural changes in the micellar Palisade layer.
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Affiliation(s)
- Manoj Kumbhakar
- Radiation Chemistry and Chemical Dynamics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
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Affiliation(s)
- Ilan Benjamin
- Department of Chemistry, University of California, Santa Cruz, California 95064, USA
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Chakraborty A, Seth D, Chakrabarty D, Setua P, Sarkar N. Dynamics of Solvent and Rotational Relaxation of Coumarin 153 in Room-Temperature Ionic Liquid 1-Butyl-3-methylimidazolium Hexafluorophosphate Confined in Brij-35 Micelles: A Picosecond Time-Resolved Fluorescence Spectroscopic Study. J Phys Chem A 2005; 109:11110-6. [PMID: 16331893 DOI: 10.1021/jp053981g] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The dynamics of solvent and rotational relaxation of Coumarin 153 (C-153) in ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) and in the ionic liquid confined in Brij-35 micellar aggregates have been investigated using steady-state and time-resolved fluorescence spectroscopy. We observed slower dynamics in the presence of micellar aggregates as compared to the pure IL. However, the slowing down in the solvation time on going from neat IL to IL-confined micelles is much smaller compared to that on going from water to water-confined micellar aggregates. The increase in solvation and rotational time in micelles is attributed to the increase in viscosity of the medium. The slow component is assumed to be dependent on the viscosity of the solution and involves large-scale rearrangement of the anions and cations while fast component is assumed to originate from the initial response of the anions during excitation. The slow component increases due to the increase in the viscosity of the medium and increase in fast component is probably due to the hydrogen bonding between the anions and polar headgroup of the surfactant. The dynamics of solvent relaxation was affected to a small extent due to the micelle formation.
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Affiliation(s)
- Anjan Chakraborty
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
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Chakrabarty D, Chakraborty A, Seth D, Hazra P, Sarkar N. Binding and relaxation behavior of Coumarin-153 in lecithin–taurocholate mixed micelles: A time resolved fluorescence spectroscopic study. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2005.06.098] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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41
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Sen P, Satoh T, Bhattacharyya K, Tominaga K. Excitation wavelength dependence of solvation dynamics of coumarin 480 in a lipid vesicle. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2005.06.065] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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42
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Chakrabarty D, Chakraborty A, Seth D, Hazra P, Sarkar N. Effect of alkyl chain length and size of the headgroups of the surfactant on solvent and rotational relaxation of Coumarin 480 in micelles and mixed micelles. J Chem Phys 2005; 122:184516. [PMID: 15918738 DOI: 10.1063/1.1895722] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The effect of alkyl chain length and size of the headgroups of the surfactant on the solvation dynamics and rotational relaxation of Coumarin 480 (C-480) has been investigated using dynamic Stokes' shift of C-480 in different types of alkyltrimethylammonium bromide micelles and mixed micelles. The rotational relaxation time increases with increase in alkyl chain length of the surfactant. The increase in the number of alkyl chains of the surfactant leads to the more close packed micelles, hence the microviscosity of the micelles increases and consequently rotational relaxation time increases. Solvation time also increases due to the increase in number of alkyl chains of the surfactant. The change in solvation and rotational relaxation time is more prominent in micelles compared to mixed micelles. The solvation and rotational relaxation time also increase with the increase in size of the headgroup of the surfactant.
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Affiliation(s)
- Debdeep Chakrabarty
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
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Kumbhakar M, Goel T, Mukherjee T, Pal H. Role of Micellar Size and Hydration on Solvation Dynamics: A Temperature Dependent Study in Triton-X-100 and Brij-35 Micelles. J Phys Chem B 2004. [DOI: 10.1021/jp0468004] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Manoj Kumbhakar
- Radiation Chemistry & Chemical Dynamics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Teena Goel
- Radiation Chemistry & Chemical Dynamics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Tulsi Mukherjee
- Radiation Chemistry & Chemical Dynamics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Haridas Pal
- Radiation Chemistry & Chemical Dynamics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
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Li S, Shepherd TD, Thompson WH. Simulations of the Vibrational Relaxation of a Model Diatomic Molecule in a Nanoconfined Polar Solvent. J Phys Chem A 2004. [DOI: 10.1021/jp048361e] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Shenmin Li
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045-7582, and Department of Chemistry/Physics, Westminster College, Salt Lake City, Utah 84105
| | - Tricia D. Shepherd
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045-7582, and Department of Chemistry/Physics, Westminster College, Salt Lake City, Utah 84105
| | - Ward H. Thompson
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045-7582, and Department of Chemistry/Physics, Westminster College, Salt Lake City, Utah 84105
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Sahu K, Roy D, Mondal SK, Halder A, Bhattacharyya K. Study of Solvation Dynamics in an Ormosil: CTAB in a Sol−Gel Matrix. J Phys Chem B 2004. [DOI: 10.1021/jp049152x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kalyanasis Sahu
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Durba Roy
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Sudip Kumar Mondal
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Arnab Halder
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Kankan Bhattacharyya
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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Thompson WH. Simulations of time-dependent fluorescence in nano-confined solvents. J Chem Phys 2004; 120:8125-33. [PMID: 15267732 DOI: 10.1063/1.1691391] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The time-dependent fluorescence of a model diatomic molecule with a charge-transfer electronic transition in confined solvents has been simulated. The effect of confining the solvent is examined by comparing results for solutions contained within hydrophobic spherical cavities of varying size (radii of 10-20 angstroms). In previous work [J. Chem. Phys. 118, 6618 (2002)] it was found that the solute position in the cavity critically affects the absorption and fluorescence spectra and their dependence on cavity size. Here we examine the effect of cavity size on the time-dependent fluorescence, a common experimental probe of solvent dynamics. The present results confirm a prediction that motion of the solute in the cavity after excitation can be important in the time-dependent fluorescence. The effects of solvent density are also considered. The results are discussed in the context of interpreting time-dependent fluorescence measurements of confined solvent systems.
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Affiliation(s)
- Ward H Thompson
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045, USA
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Shirota H, Tamoto Y, Segawa H. Dynamic Fluorescence Probing of the Microenvironment of Sodium Dodecyl Sulfate Micelle Solutions: Surfactant Concentration Dependence and Solvent Isotope Effect. J Phys Chem A 2004. [DOI: 10.1021/jp035861j] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hideaki Shirota
- Department of General Systems Sciences, Graduate School of Arts & Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan, and Department of Applied Chemistry, Graduate School of Engineering, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - Yushi Tamoto
- Department of General Systems Sciences, Graduate School of Arts & Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan, and Department of Applied Chemistry, Graduate School of Engineering, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - Hiroshi Segawa
- Department of General Systems Sciences, Graduate School of Arts & Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan, and Department of Applied Chemistry, Graduate School of Engineering, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
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Glasbeek M, Zhang H. Femtosecond Studies of Solvation and Intramolecular Configurational Dynamics of Fluorophores in Liquid Solution. Chem Rev 2004; 104:1929-54. [PMID: 15080717 DOI: 10.1021/cr0206723] [Citation(s) in RCA: 214] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Max Glasbeek
- Laboratory for Physical Chemistry, University of Amsterdam, Nieuwe Achtergracht 129, 1018 WS Amsterdam, The Netherlands.
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Halder A, Sen S, Burman AD, Patra A, Bhattacharyya K. Solvation Dynamics in Dimyristoyl-Phosphatidylcholine Entrapped Inside a Sol−Gel Matrix. J Phys Chem B 2004. [DOI: 10.1021/jp035685e] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Arnab Halder
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India, and Sol-Gel Division, Central Glass & Ceramic Research Institute, Jadavpur, Kolkata 700 032, India
| | - Sobhan Sen
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India, and Sol-Gel Division, Central Glass & Ceramic Research Institute, Jadavpur, Kolkata 700 032, India
| | - Anupam Das Burman
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India, and Sol-Gel Division, Central Glass & Ceramic Research Institute, Jadavpur, Kolkata 700 032, India
| | - Amitava Patra
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India, and Sol-Gel Division, Central Glass & Ceramic Research Institute, Jadavpur, Kolkata 700 032, India
| | - Kankan Bhattacharyya
- Physical Chemistry Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India, and Sol-Gel Division, Central Glass & Ceramic Research Institute, Jadavpur, Kolkata 700 032, India
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Chakrabarty D, Hazra P, Sarkar N. Solvation Dynamics of Coumarin 480 in TritonX-100 (TX-100) and Bile Salt Mixed Micelles. J Phys Chem A 2003. [DOI: 10.1021/jp0271458] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Debdeep Chakrabarty
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
| | - Partha Hazra
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
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