1
|
Nandi S, Ghosh B, Ghosh M, Layek S, Nandi PK, Sarkar N. Phenylalanine Interacts with Oleic Acid-Based Vesicle Membrane. Understanding the Molecular Role of Fibril-Vesicle Interaction under the Context of Phenylketonuria. J Phys Chem B 2021; 125:9776-9793. [PMID: 34420302 DOI: 10.1021/acs.jpcb.1c05592] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In the present contribution, on the basis of a spectroscopic and microscopic investigation, the characterization and photophysics of various assemblies of oleic acid/oleate solution at three pH values, namely, 8.28, 9.72, and 11.77, were explored. The variation in the dynamic response of aqua molecules in and around the assemblies has been interrogated by a picoseconds solvation dynamics experiment using a time-correlated single-photon counting setup employing coumarin-153 as a probe. On the one hand, the time-resolved fluorescence anisotropy measurement along with the fluorescence correlation spectroscopy experiment was executed to extract information regarding the comparison of the extent of the internal restricted confinement of these assemblies. On the other hand, an effort to investigate the cross-interaction between the self-assembled architectures of l-phenylalanine (l-Phe), responsible for phenylketonuria (PKU) disorder, and the oleic acid at the vesicle-forming pH established that the l-Phe fibrillar morphologies strongly alter the dynamic properties of the vesicle membrane formed by the oleic acid. Specifically, the interaction of the l-Phe assemblies with the oleic acid vesicle membrane is found to introduce the flexibility of the vesicle membrane and alter the hydration properties of the membrane. To track the fibril-induced alterations of the oleic acid vesicle properties, various spectroscopic and microscopic investigations were performed. The mutual reconciliation of the experimental outputs, therefore, portrays the state of the art, which accounts for the fibril-induced alterations of the properties of the oleic acid vesicle membrane, the mimicking setup of the cellular membrane, thereby informing us that alterations of such a property of the membrane should be taken into active consideration during the rational development of therapeutic modulators against disorders like PKU.
Collapse
Affiliation(s)
- Sourav Nandi
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India
| | - Biswajoy Ghosh
- School of Medical Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India
| | - Meghna Ghosh
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India
| | - Souvik Layek
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India
| | - Pratyush Kiran Nandi
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India
| |
Collapse
|
2
|
Tarif E, Mukherjee K, Kumbhakar K, Barman A, Biswas R. Dynamics at the non-ionic micelle/water interface: Impact of linkage substitution. J Chem Phys 2019; 151:154902. [DOI: 10.1063/1.5121334] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Ejaj Tarif
- Chemical, Biological and Macromolecular Sciences (CBMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
| | - Kallol Mukherjee
- Chemical, Biological and Macromolecular Sciences (CBMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
| | - Kajal Kumbhakar
- Chemical, Biological and Macromolecular Sciences (CBMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
| | - Anjan Barman
- Condensed Matter Physics and Material Sciences (CMPMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
| | - Ranjit Biswas
- Chemical, Biological and Macromolecular Sciences (CBMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
| |
Collapse
|
3
|
Bhat PA, Chat OA, Dar AA. Self-assembled nanocontainer mediated oxidation of Fe(ii) by Cu(ii)–neocuproine complex: a model system to emulate electron transfer proteins. NEW J CHEM 2018. [DOI: 10.1039/c8nj00998h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Catalysis of coordination inspired Fe(ii) oxidation by Cu(ii)–neocuproine complex.
Collapse
Affiliation(s)
- Parvaiz Ahmad Bhat
- Physical Chemistry Division
- Department of Chemistry
- University of Kashmir
- Srinagar-190006
- India
| | - Oyais Ahmad Chat
- Physical Chemistry Division
- Department of Chemistry
- University of Kashmir
- Srinagar-190006
- India
| | - Aijaz Ahmad Dar
- Physical Chemistry Division
- Department of Chemistry
- University of Kashmir
- Srinagar-190006
- India
| |
Collapse
|
4
|
Mora AK, Singh PK, Nath S. Controlled Sequestration of DNA Intercalated Drug by Polymer–Surfactant Supramolecular Assemblies. J Phys Chem B 2016; 120:4143-51. [DOI: 10.1021/acs.jpcb.5b12689] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Aruna K. Mora
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Prabhat K. Singh
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Sukhendu Nath
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| |
Collapse
|
5
|
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.
Collapse
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
| |
Collapse
|
6
|
Ray D, Pramanik A, Guchhait N. Modulation of Excited State Proton Transfer Dynamics of a Lactim-Lactam Tautomeric System in Different Block Copolymer-Surfactant Aggregates. J Phys Chem B 2015; 119:10114-23. [PMID: 26147185 DOI: 10.1021/acs.jpcb.5b02363] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The proton transfer (PT) process in 1-(2-hydroxy-5-chloro-phenyl)-3,5-dioxo-1H-imidazo-[3,4-b]isoindole (ADCL) has been studied in three different copolymer-surfactant supramolecular assemblies prepared in aqueous 1% P123 triblock copolymer micellar solution with varying concentrations of surfactants (sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide (CTAB), and triton-X-100 (TX 100)). The aim of the present study is to monitor the modulation of the PT process by changing the degree of micellar hydration inside the P123 micelle with the addition of the three different surfactants (two ionic and one non ionic), that is, in P123-surfactant aggregates. Besides, a comparative study has been done with these results with those in water, pure P123 micellar medium and three different surfactants medium. The micropolarity measurement and time-resolved fluorescence anisotropic measurements have been performed to evaluate the binding location of the probe (ADCL) in the three different copolymer-surfactant supramolecular assemblies. It is found that the micropolarity at the binding site of the molecule in the various environments largely influences the PT rate of ADCL. The PT rate is found to be the slowest in the P123 medium and in P123-surfactant aggregates the rate becomes faster as the micropolarity around the binding locations of the molecule in these aggregates is higher in comparison to that in P123 micelle.
Collapse
Affiliation(s)
- Debarati Ray
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata-700009, India
| | - Animesh Pramanik
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata-700009, India
| | - Nikhil Guchhait
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata-700009, India
| |
Collapse
|
7
|
Roy A, Kundu N, Banik D, Kuchlyan J, Sarkar N. How does bile salt penetration affect the self-assembled architecture of pluronic P123 micelles? – light scattering and spectroscopic investigations. Phys Chem Chem Phys 2015; 17:19977-90. [DOI: 10.1039/c5cp02296g] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The triblock copolymer of the type (PEO)20–(PPO)70–(PEO)20 (P123) forms a mixed supramolecular aggregate with different bile salts, sodium deoxycholate (NaDC) and sodium taurocholate (NaTC), having different hydrophobicity.
Collapse
Affiliation(s)
- Arpita Roy
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur 721302
- India
| | - Niloy Kundu
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur 721302
- India
| | - Debasis Banik
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur 721302
- India
| | - Jagannath Kuchlyan
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur 721302
- India
| | - Nilmoni Sarkar
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur 721302
- India
| |
Collapse
|
8
|
Soni SS, Vekariya RL, Sastry NV, Soni HP, Patil SR, Panjabi SH. Nonelectrolyte-Induced Micellar Shape Changes in Aqueous Solutions of Silicone Surfactants. J DISPER SCI TECHNOL 2014. [DOI: 10.1080/01932691.2013.848406] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
9
|
Tiwari AK, Sonu, Saha SK. Effect of Hydroxyl Group Substituted Spacer Group of Cationic Gemini Surfactants on Solvation Dynamics and Rotational Relaxation of Coumarin-480 in Aqueous Micelles. J Phys Chem B 2014; 118:3582-92. [DOI: 10.1021/jp4069703] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Amit K. Tiwari
- Department of Chemistry, Birla Institute of Technology and Science, Pilani 333 031, Rajasthan, India
| | - Sonu
- Department of Chemistry, Birla Institute of Technology and Science, Pilani 333 031, Rajasthan, India
| | - Subit K. Saha
- Department of Chemistry, Birla Institute of Technology and Science, Pilani 333 031, Rajasthan, India
| |
Collapse
|
10
|
Kim JO, Oberoi HS, Desale S, Kabanov AV, Bronich TK. Polypeptide nanogels with hydrophobic moieties in the cross-linked ionic cores: synthesis, characterization and implications for anticancer drug delivery. J Drug Target 2013; 21:981-93. [PMID: 23998716 PMCID: PMC4020517 DOI: 10.3109/1061186x.2013.831421] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Polymer nanogels have gained considerable attention as a potential platform for drug delivery applications. Here we describe the design and synthesis of novel polypeptide-based nanogels with hydrophobic moieties in the cross-linked ionic cores. Diblock copolymer, poly(ethylene glycol)-b-poly(L-glutamic acid), hydrophobically modified with L-phenylalanine methyl ester moieties was used for controlled template synthesis of nanogels with small size (ca. 70 nm in diameter) and narrow particle size distribution. Steady-state and time-resolved fluorescence studies using coumarin C153 indicated the existence of hydrophobic domains in the ionic cores of the nanogels. Stable doxorubicin-loaded nanogels were prepared at high drug capacity (30 w/w%). We show that nanogels are enzymatically-degradable leading to accelerated drug release under simulated lysosomal acidic pH. Furthermore, we demonstrate that the nanogel-based formulation of doxorubicin is well tolerated and exhibit an improved antitumor activity compared to a free doxorubicin in an ovarian tumor xenograft mouse model. Our results signify the point to a potential of these biodegradable nanogels as attractive carriers for delivery of chemotherapeutics.
Collapse
Affiliation(s)
- Jong Oh Kim
- Department of Pharmaceutical Sciences and Center for Drug Delivery and Nanomedicine, College of Pharmacy, University of Nebraska Medical Center, 985830 Nebraska Medical Center, Omaha, NE 68198-5830, USA
- College of Pharmacy, Yeungnam University, Gyeongsan, 712-749, South Korea
| | - Hardeep S. Oberoi
- Department of Pharmaceutical Sciences and Center for Drug Delivery and Nanomedicine, College of Pharmacy, University of Nebraska Medical Center, 985830 Nebraska Medical Center, Omaha, NE 68198-5830, USA
| | - Swapnil Desale
- Department of Pharmaceutical Sciences and Center for Drug Delivery and Nanomedicine, College of Pharmacy, University of Nebraska Medical Center, 985830 Nebraska Medical Center, Omaha, NE 68198-5830, USA
| | - Alexander V. Kabanov
- Department of Pharmaceutical Sciences and Center for Drug Delivery and Nanomedicine, College of Pharmacy, University of Nebraska Medical Center, 985830 Nebraska Medical Center, Omaha, NE 68198-5830, USA
| | - Tatiana K. Bronich
- Department of Pharmaceutical Sciences and Center for Drug Delivery and Nanomedicine, College of Pharmacy, University of Nebraska Medical Center, 985830 Nebraska Medical Center, Omaha, NE 68198-5830, USA
| |
Collapse
|
11
|
Pan A, Mati SS, Naskar B, Bhattacharya SC, Moulik SP. Self-Aggregation of MEGA-9 (N-Nonanoyl-N-methyl-d-glucamine) in Aqueous Medium: Physicochemistry of Interfacial and Solution Behaviors with Special Reference to Formation Energetics and Micelle Microenvironment. J Phys Chem B 2013; 117:7578-92. [DOI: 10.1021/jp400139d] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Animesh Pan
- Centre for Surface
Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Soumya Sundar Mati
- Centre for Surface
Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Bappaditya Naskar
- Centre for Surface
Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | | | - Satya Priya Moulik
- Centre for Surface
Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| |
Collapse
|
12
|
Hierrezuelo JM, Ruiz CC. Rotational diffusion of coumarin 153 in nanoscopic micellar environments of n-dodecyl-β-D-maltoside and n-dodecyl-hexaethylene-glycol mixtures. J Phys Chem A 2012; 116:12476-85. [PMID: 23214482 DOI: 10.1021/jp308379j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The microstructure of mixed micelles containing n-dodecyl-β-D-maltoside and n-dodecyl-hexaethylene-glycol, two nonionic surfactants belonging to the alkyl polyglucoside and polyoxyethyelene alkyl ether families, respectively, has been investigated. With the aim of understanding how the micellar composition affects the microenvironmental properties of micelles, we have examined the photophysics and dynamics of the neutral probe coumarin 153 in the binary mixtures of the surfactants across the entire composition range. We present data on the steady-state absorption and emission spectra of the probe, as well as fluorescence lifetimes and both steady-state and time-resolved fluorescence anisotropies. These data indicate that the participation of the ethoxylated surfactant in the mixed micelle induces an increasing hydration in the palisade layer of the micelle, which forces the probe to migrate toward the inner micellar region, where it senses a slightly less polar environment. The time-resolved fluorescence anisotropy data were analyzed on the basis of the two-step and wobbling-in-cone model. The average reorientation time of the probe molecule was found to decrease with the presence of the ethoxylated surfactant, in good agreement with steady-state fluorescence anisotropy data, suggesting a reduction of the microviscosity in the solubilization site of the probe. The behavior of all diffusion reorientation parameters was analyzed on the basis of two factors: the micellar hydration and the headgroup flexibility of both surfactants. It was concluded that the increasing participation of the ethoxylated surfactant induces a greater hydration in the micellar palisade layer, producing the formation of a less compact microenvironment where the probe experiences a faster rotational reorientation.
Collapse
Affiliation(s)
- J M Hierrezuelo
- Departamento de Física Aplicada II, Escuela de Ingenierías, Universidad de Málaga, Málaga, Spain
| | | |
Collapse
|
13
|
Carnero Ruiz C. Rotational dynamics of coumarin 153 in non-ionic mixed micelles of n-octyl-β-d-thioglucoside and Triton X-100. Photochem Photobiol Sci 2012; 11:1331-8. [DOI: 10.1039/c2pp25049g] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
|
14
|
Zhang L, Yin Q, Su J, Wu Q. Local Polarity and Microviscosity of the Interior of Dendritic Polyethylene Amphiphiles. Macromolecules 2011. [DOI: 10.1021/ma2013089] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Ling Zhang
- DSAPM Lab, School of Chemistry and Chemical Engineering, and PCFM Lab, OFCM Institute, Sun Yat-Sen University, Guangzhou 510275, China
| | - Qihe Yin
- DSAPM Lab, School of Chemistry and Chemical Engineering, and PCFM Lab, OFCM Institute, Sun Yat-Sen University, Guangzhou 510275, China
| | - Jing Su
- DSAPM Lab, School of Chemistry and Chemical Engineering, and PCFM Lab, OFCM Institute, Sun Yat-Sen University, Guangzhou 510275, China
| | - Qing Wu
- DSAPM Lab, School of Chemistry and Chemical Engineering, and PCFM Lab, OFCM Institute, Sun Yat-Sen University, Guangzhou 510275, China
| |
Collapse
|
15
|
Soni S, Panjabi S, Sastry N. Effect of non-electrolyte additives on micellization and clouding behavior of silicone surfactant in aqueous solutions. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2010.12.048] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
16
|
Kumbhakar M, Dey S, Singh PK, Nath S, Satpati AK, Gangully R, Aswal VK, Pal H. Tuning of Intermolecular Electron Transfer Reaction by Modulating the Microenvironment Inside Copolymer−Surfactant Supramolecular Assemblies. J Phys Chem B 2011; 115:1638-51. [DOI: 10.1021/jp109217v] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
| | - Swayandipta Dey
- Chemistry Department, Pondicherry University, Kalapet, Pondicherry 605014, India
| | | | | | | | | | | | | |
Collapse
|
17
|
Chaibundit C, Ricardo NMPS, Ricardo NMPS, O'Driscoll BMD, Hamley IW, Yeates SG, Booth C. Aqueous gels of mixtures of ionic surfactant SDS with pluronic copolymers P123 or F127. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:13776-13783. [PMID: 19572512 DOI: 10.1021/la901584u] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Gel diagrams based on tube inversion and oscillatory rheometry are reported for Pluronic copolymers F127 (E(98)P(67)E(98)) and P123 (E(21)P(67)E(21)) in mixtures with anionic surfactant sodium dodecyl sulfate (SDS). Total concentrations (c, SDS+copolymer) were as high as 50 wt % with mole ratios SDS/copolymer (mr) in the ranges 1-5 (F127) and 1-7 (P123). Temperatures were as high as 90 degrees C. Determination of the temperature dependences of the dynamic moduli served to confirm the gel boundaries from tube inversion and to reveal the high elastic moduli of the gels, e.g., compared at comparable positions in the gel phase, a 50 wt % SDS/P123 with mr = 7 had G' three times that of a corresponding gel of P123 alone. Small-angle X-ray scattering (SAXS) was used to show that the structures of all the SDS/F127 gels were bcc and that the structures of the SDS/P123 gels with mr = 1 were either fcc (c = 30 wt %) or hex (c = 40 wt %). Assignment of structures to SDS/P123 gels with values of mr in the range 3-7 was more difficult, as high-order scattering peaks could be very weak, and at the higher values of c and mr, the SAXS peaks included multiple reflections.
Collapse
Affiliation(s)
- Chiraphon Chaibundit
- Polymer Science Program, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, 90112 Thailand
| | | | | | | | | | | | | |
Collapse
|
18
|
George S, Kumbhakar M, Singh PK, Ganguly R, Nath S, Pal H. Fluorescence spectroscopic investigation to identify the micelle to gel transition of aqueous triblock copolymer solutions. J Phys Chem B 2009; 113:5117-27. [PMID: 19317476 DOI: 10.1021/jp809826c] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Steady-state and time-resolved fluorescence anisotropy measurements using probes coumarin 153 (C153) and 4-heptadecylumbelliferon (HUF) have been carried out to understand the micelle to gel transition of an aqueous triblock copolymer P123 ((EO)(20)-(PO)(70)-(EO)(20)) (EO = ethylene oxide; PO = propylene oxide) solution. Anisotropy results with a normal fluorescent probe, C153, do not show a characteristic change due to the micelle to gel transition. However, the probe HUF having a long hydrocarbon chain that helps its strong association with the micelle shows an increase in anisotropy above the sol-gel transition point. This difference has been explained as invoking a substantial contribution from the micellar structural fluctuations to the depolarization of HUF as its hydrocarbon chain is embedded in the micellar structure, which is not sensed significantly by the normal probe C153. That the extent of change in anisotropy for HUF upon gelation is not that large is possibly caused by the collective motion of the physically interconnected nodes, as observed from the dynamic light scattering studies, which acts in favor of a relatively faster depolarization in the gel phase. Similar studies in other copolymers, such as P85 ((EO)(26)-(PO)(40)-(EO)(26)) and F127 ((EO)(100)-(PO)(65)-(EO)(100)), further demonstrate the potential of probes latched with hydrocarbon chains in displaying a characteristic change for the micelle to gel transition which otherwise remains obscured for normal fluorescent probes.
Collapse
Affiliation(s)
- Sony George
- Chemistry Department, University of Kerala, Kariavattom Campus, Thiruvananthapuram, Kerala 695581, Bhabha Atomic Research Centre, Mumbai 400085, India
| | | | | | | | | | | |
Collapse
|
19
|
Singh PK, Kumbhakar M, Pal H, Nath S. Modulation in the Solute Location in Block Copolymer−Surfactant Supramolecular Assembly: A Time-resolved Fluorescence Study. J Phys Chem B 2009; 113:1353-9. [DOI: 10.1021/jp808123m] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Prabhat K. Singh
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Manoj Kumbhakar
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Haridas Pal
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Sukhendu Nath
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| |
Collapse
|
20
|
The use of coumarins as environmentally-sensitive fluorescent probes of heterogeneous inclusion systems. Molecules 2009; 14:210-37. [PMID: 19127249 PMCID: PMC6253935 DOI: 10.3390/molecules14010210] [Citation(s) in RCA: 310] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2008] [Revised: 12/23/2008] [Accepted: 01/04/2009] [Indexed: 11/16/2022] Open
Abstract
Coumarins, as a family of molecules, exhibit a wide range of fluorescence emission properties. In many cases, this fluorescence is extremely sensitive to the local environment of the molecule, especially the local polarity and microviscosity. In addition, coumarins show a wide range of size, shape, and hydrophobicity. These properties make them especially useful as fluorescent probes of heterogeneous environments, such as supramolecular host cavities, micelles, polymers and solids. This article will review the use of coumarins to probe such heterogeneous systems using fluorescence spectroscopy.
Collapse
|
21
|
|
22
|
Singh PK, Kumbhakar M, Pal H, Nath S. Effect of Electrostatic Interaction on the Location of Molecular Probe in Polymer−Surfactant Supramolecular Assembly: A Solvent Relaxation Study. J Phys Chem B 2008; 112:7771-7. [DOI: 10.1021/jp800701v] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Prabhat K. Singh
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Manoj Kumbhakar
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Haridas Pal
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Sukhendu Nath
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| |
Collapse
|
23
|
Kumbhakar M, Singh PK, Nath S, Bhasikuttan AC, Pal H. Ultrafast Bimolecular Electron Transfer Dynamics in Micellar Media. J Phys Chem B 2008; 112:6646-52. [DOI: 10.1021/jp800752d] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Manoj Kumbhakar
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Prabhat K. Singh
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Sukhendu Nath
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | | | - Haridas Pal
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| |
Collapse
|
24
|
Mali KS, Dutt GB, Mukherjee T. Photoisomerization of cyanine derivatives in 1-butyl-3-methylimidazolium hexafluorophosphate and aqueous glycerol: Influence of specific interactions. J Chem Phys 2008; 128:124515. [DOI: 10.1063/1.2883954] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
|
25
|
Kumbhakar M. Aggregation of Ionic Surfactants to Block Copolymer Assemblies: A Simple Fluorescence Spectral Study. J Phys Chem B 2007; 111:14250-5. [DOI: 10.1021/jp077220k] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Manoj Kumbhakar
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| |
Collapse
|