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Selva Sharma A, Ryou SM, Lee JH, Lee NY. New insights into the photophysical properties and interaction mechanisms of Janus green blue dye with polyanions and its applications in colorimetric visualization of loop-mediated isothermal amplification and polymerase chain reaction. J Mater Chem B 2024; 12:10082-10092. [PMID: 39268583 DOI: 10.1039/d4tb01623h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/17/2024]
Abstract
In this investigation, the photophysical properties and interaction mechanisms of Janus green blue (JGB) dye with polyanions were systematically studied using spectroscopic techniques. The absorption spectral analysis revealed that JGB binds cooperatively to sodium alginate, leading to dye stacking along the polymer chain. The interaction of JGB dye with DNA was characterized by the emergence of a metachromatic peak at 564 nm, indicating the formation of dye aggregates. The analysis of absorption data reveals that JGB dye interacts with DNA at multiple binding sites, including at least one high-affinity site. The AutoDock Vina based blind docking approach was used to analyze the most probable binding location of JGB dye in DNA. By making use of the DNA-induced metachromasia, a colorimetric approach was developed for the visualization of loop-mediated isothermal amplification (LAMP) and polymerase chain reaction (PCR). The LAMP-colorimetric assay, targeting the Streptococcus pneumoniae gene, demonstrated a noticeable colour change with a detection limit of 1 pg μL-1. The practical applicability was validated by detecting S. pneumoniae in artificial urine. In addition to LAMP, we tested the JGB dye based colorimetric assay for applicability in PCR reactions. The colorimetric PCR assay using the metal-responsive transcription factor (MTF-1) gene achieved a detection limit as low as 0.1 pg μL-1. The study highlights the potential of DNA binding metachromic dye to significantly enhance colorimetric assays, offering a robust and sensitive tool for molecular diagnostics.
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Affiliation(s)
- Arumugam Selva Sharma
- Department of Nanoscience and Technology, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, South Korea
| | - Sung Min Ryou
- Department of BioNano Technology, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, South Korea.
| | - Ji Hyeok Lee
- Department of BioNano Technology, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, South Korea.
| | - Nae Yoon Lee
- Department of BioNano Technology, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, South Korea.
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Chakraborty G, Bhattarai A, De R. Polyelectrolyte-Dye Interactions: An Overview. Polymers (Basel) 2022; 14:598. [PMID: 35160587 PMCID: PMC8840521 DOI: 10.3390/polym14030598] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 01/24/2022] [Accepted: 01/31/2022] [Indexed: 02/01/2023] Open
Abstract
Polyelectrolytes are polymers with repeating units of ionizable groups coupled with counterions. Recently, polyelectrolytes have drawn significant attention as highly promising macromolecular materials with potential for applications in almost every sector of our daily lives. Dyes are another class of chemical compounds that can interact with substrates and subsequently impart color through the selective absorption of electromagnetic radiation in the visible range. This overview begins with an introduction to polyelectrolytes and dyes with their respective definitions, classifications (based on origin, molecular architecture, etc.), and applications in diverse fields. Thereafter, it explores the different possible interactions between polyelectrolytes and dyes, which is the main focus of this study. The various mechanisms involved in dye-polyelectrolyte interactions and the factors that influence them are also surveyed. Finally, these discussions are summarized, and their future perspectives are presented.
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Affiliation(s)
- Gulmi Chakraborty
- Department of Chemistry, C. V. Raman Global University, Odisha 752054, India;
| | - Ajaya Bhattarai
- Department of Chemistry, Mahendra Morang Adarsh Multiple Campus, Tribhuvan University, Biratnagar 56613, Nepal
| | - Ranjit De
- School of Material Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Korea
- Department of Life Sciences, Pohang University of Science and Technology, Pohang 37673, Korea
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3
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S’Id EC, Degué M, Khalifa C, M’Bareck C. Removal of crystal violet from water by poly acrylonitrile-co-sodium methallyl sulfonate (AN69) and poly acrylic acid (PAA) synthetic membranes. JOURNAL OF POLYMER ENGINEERING 2021. [DOI: 10.1515/polyeng-2021-0202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The current investigation is focused on the removal of crystal violet (CV) from water by adsorption process (bach method). To achieve this purpose, specific membranes were prepared from poly acrylonitrile-co-sodium methallyl sulfonate (AN69) and poly acrylic acid (PAA) blends. The adsorption of CV onto AN69/PAA membranes was studied under various conditions: membrane composition, pH, contact time, initial concentration and temperature. To understand the effect of membrane morphology on adsorption process, scanning electronic microscopy (SEM) was employed to determine the features of section and membrane’s surface. From isotherm results, it was found that: the maximum adsorption capacity Q
m
was 1250 mg g−1, the Langmuir separation factor R
L was lying between 0.33 and 0.76, the Freundlich intensity was higher than Unit (n = 1.25) and the adsorption process follows preferentially the Langmuir model (correlation constant R
2 = 0.99). The mechanism of adsorption is perfectly fitted by pseudo second order. The obtained results tend to confirm that the removal of dye molecules is due to the establishment of strong electrostatic interactions between cationic dye molecules and anionic membrane groups. The high adsorption capacity (1250 mg g−1) for the small dye molecules may open wide opportunities to apply these membranes in the removal of various hazardous pollutants commonly present in water.
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Affiliation(s)
- Ely Cheikh S’Id
- Membranes, Matériaux, Environnement et Milieux Aquatiques (2MEMA), FST University of Nouakchott Al-Aasriya , BP 5026 , Nouakchott 5026 , Mauritania
| | - Mohamed Degué
- Membranes, Matériaux, Environnement et Milieux Aquatiques (2MEMA), FST University of Nouakchott Al-Aasriya , BP 5026 , Nouakchott 5026 , Mauritania
| | - Chlouma Khalifa
- Membranes, Matériaux, Environnement et Milieux Aquatiques (2MEMA), FST University of Nouakchott Al-Aasriya , BP 5026 , Nouakchott 5026 , Mauritania
| | - Chamekh M’Bareck
- Membranes, Matériaux, Environnement et Milieux Aquatiques (2MEMA), FST University of Nouakchott Al-Aasriya , BP 5026 , Nouakchott 5026 , Mauritania
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4
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Šimonová Baranyaiová T, Mészáros R, Sebechlebská T, Bujdák J. Non-Arrhenius kinetics and slowed-diffusion mechanism of molecular aggregation of a rhodamine dye on colloidal particles. Phys Chem Chem Phys 2021; 23:17177-17185. [PMID: 34346441 DOI: 10.1039/d1cp02762j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The non-covalent association is important for many fields of science, including processes in living systems. This work elucidates the mechanism of rhodamine 123 molecular aggregation in dispersions of a layered silicate and explains the mystery of the slow kinetics of this process. Chemometric analysis of thousands of spectra recorded by stopped-flow visible spectroscopy identified two parallel diffusion processes described by a two-phase exponential function. The slow and fast processes followed the super-Arrhenius kinetics and were assigned to lateral (surface) diffusion and inter-particle diffusion of dye cations, respectively. This work, supported by a large amount of data and their in-depth analysis, provides the first evidence of how these processes coexist together and provides quantitative analysis of their dependence on the reaction conditions. The implications of this work can be crucial for understanding the mechanism of the non-covalent association of adsorbed molecules in nature.
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Affiliation(s)
- Tímea Šimonová Baranyaiová
- Department of Hydrosilicates, Institute of Inorganic Chemistry, Slovak Academy of Sciences, 845 36 Bratislava, Slovakia.
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Pandey SP, Awasthi AA, Singh PK. Supramolecular tuning of thioflavin-T aggregation hosted by polystyrene sulfonate. Phys Chem Chem Phys 2021; 23:14716-14724. [PMID: 34190258 DOI: 10.1039/d1cp02030g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Tunable and controllable emission is an extremely desirable feature for advanced functional materials that finds usage in optoelectronic utilization, fluorescence probing/sensing, drug-delivery monitoring, etc. In the present contribution, we have employed a macrocyclic host molecule, sulfobutyl ether-β-cyclodextrin (SBE-β-CD), as a tuning agent for an intensely emissive aggregate assembly of a molecular rotor dye, thioflavin-T (ThT), in the presence of an anionic polyelectrolyte, polystyrene sulfonate (PSS). The macrocyclic host breaks the PSS templated ThT aggregates and leads to encapsulation of released ThT molecules, tailoring the emission response of the system in terms of intensity and wavelength. Utilizing the established selectivity of the cyclodextrin-adamantane system, reverse control of this tunable emission has been further achieved. The controllable fluorescence system has been extensively investigated using ground-state absorption, steady-state and time-resolved emission spectroscopy. This kind of supramolecular tailoring of self-assembled aggregate emission has enormous potential in the field of fluorescence sensors and probes, and imaging and tracking in biological systems.
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Affiliation(s)
- Shrishti P Pandey
- Amity Institute of Biotechnology, Amity University, Mumbai-Pune Expressway, Bhatan, Panvel, Mumbai, 410206, India and Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
| | - Ankur A Awasthi
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
| | - Prabhat K Singh
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India. and Homi Bhabha National Institute, Anushaktinagar, Mumbai-400085, India
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Singh G, Pandey SP, Singh PK. Anionic Polyelectrolyte-Induced Aggregation of Basic Orange 21: A Clue toward Metachromasia. J Phys Chem B 2021; 125:7033-7043. [PMID: 34137609 DOI: 10.1021/acs.jpcb.1c02127] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The change in the color of chromophore upon being embedded in a biological tissue is known as metachromasia. Basic Orange 21 (BO21) is a cationic polymethine dye that has been implied as a supravital dye, which produces metachromasia in leukocytes. An improved differential counting of leukocytes has been achieved in the clinical setup based on characteristic metachromatic expressions of BO21 for different types of leukocytes. Although BO21 has been utilized as a chromatic indicator for leukocyte counting, there are limited number of investigations that focus on the factors that may be responsible for the spectral shift in absorption and emission spectra of BO21, which leads to its metachromatic behavior. In this work, we have investigated the effect of a synthetic anionic polyelectrolyte, polystyrene sulfonate (PSS), on the photophysical properties of BO21, using steady-state emission, ground-state absorption, and time-resolved emission measurements, to get an understanding of the factors that may be responsible for the spectral shift of BO21 in the cellular environment. PSS induces aggregation of BO21 molecules with large changes in its photophysical properties; this appears to be most likely the mechanism of spectral shift for BO21 reported in the cellular environment. The employment of external stimulus reveals BO21 aggregates to be significantly responsive toward external stimuli, for example, temperature and presence of salt in the medium, which further strengthens the proposal of aggregate formation. Further, we have also employed fluorescence upconversion spectroscopy with subpicosecond time resolution to estimate the excited-state lifetime of BO21.
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Affiliation(s)
- Gaurav Singh
- UM-DAE Centre for Excellence in Basic Sciences, University of Mumbai, Kalina, Santacruz (E), Mumbai 400098, India
| | - Shrishti P Pandey
- Amity Institute of Biotechnology, Amity University, Mumbai-Pune Expressway, Bhatan, Panvel, Mumbai 410206, India.,Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Prabhat K Singh
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India.,Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, India
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7
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Awasthi AA, Pandey SP, Singh PK. Supramolecular Control on the Optical Properties of a Dye-Polyelectrolyte Assembly. Chemphyschem 2021; 22:975-984. [PMID: 33759328 DOI: 10.1002/cphc.202100092] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 03/17/2021] [Indexed: 12/16/2022]
Abstract
Control of fluorescent molecular assemblies is an exciting area of research with large potential for various important applications, such as, fluorescence sensing/probing, cell imaging and monitoring drug-delivery. In the present contribution, we have demonstrated control on the extent of aggregation of a dye-polyelectrolyte assembly using a macrocyclic host molecule, sulfobutylether-β-cyclodextrin (SBE-β-CD). Initially, a cationic molecular rotor based organic dye, Auramine-O (AuO), undergoes aggregation in the presence of an anionic polyelectrolyte, polystyrene sulfonate (PSS), and displays a broad intense new emission band along with large variation in its absorption features and excited-state lifetime. A manipulation of the monomer-aggregate equilibrium of the dye-polyelectrolyte assembly has been achieved by introducing a cyclodextrin based supramolecular host, SBE-β-CD, which leads to relocation of AuO molecules from polyelectrolyte (PSS) to supramolecular host cavity, owing to the formation of a host-guest complex between AuO and SBE-β-CD. A reversible control on this manipulation of monomer-aggregate equilibrium is further achieved by introducing a competitive guest for the host cavity i. e., 1-Adamantanol. Thus, we have demonstrated an interesting control on the dye-polyelectrolyte aggregate assembly using a supramolecular host molecule which open up exciting possibilities to construct responsive materials using a repertoire of various host-specific guest molecules.
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Affiliation(s)
- Ankur A Awasthi
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400 085, India
| | - Shrishti P Pandey
- Amity Institute of Biotechnology, Amity University, Mumbai-Pune Expressway, Bhatan, Panvel, Mumbai, 410206, India
| | - Prabhat K Singh
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400 085, India.,Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai-400 094, India
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8
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M’Bareck C, S’Id EC, Kheribech A, Elouahli A, Hatim Z. Synthesis of polyacrylonitrile-co-sodium methallyl sulfonate copolymer (AN69) and polyacrylic acid (PAA) membranes for the removal of methylene blue from water. Polym Bull (Berl) 2020. [DOI: 10.1007/s00289-019-03024-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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9
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Molecular aggregates of pyronin dyes with polyelectrolyte polystyrene sulfonate (PSS) in aqueous solution. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2019.112309] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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10
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Pithan PM, Kuhlmann C, Engelhard C, Ihmels H. Synthesis of 5-Alkyl- and 5-Phenylamino-Substituted Azothiazole Dyes with Solvatochromic and DNA-Binding Properties. Chemistry 2019; 25:16088-16098. [PMID: 31523866 PMCID: PMC6973281 DOI: 10.1002/chem.201903657] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2019] [Revised: 09/09/2019] [Indexed: 01/24/2023]
Abstract
A series of new 5-mono- and 5,5'-bisamino-substituted azothiazole derivatives was synthesized from the readily available diethyl azothiazole-4,4'-dicarboxylate. This reaction most likely comprises an initial Michael-type addition by the respective primary alkyl and aromatic amines at the carbon atom C5 of the substrate. Subsequently, the resulting intermediates are readily oxidized by molecular oxygen to afford the amino-substituted azothiazole derivatives. The latter exhibit remarkably red-shifted absorption bands (λabs =507-661 nm) with high molar extinction coefficients and show a strong positive solvatochromism. As revealed by spectrometric titrations and circular and linear dichroism studies, the water-soluble, bis-(dimethylaminopropylamino)-substituted azo dye associates with duplex DNA by formation of aggregates along the phosphate backbone at high ligand-DNA ratios (LDR) and by intercalation at low LDR, which also leads to a significant increase of the otherwise low emission intensity at 671 nm.
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Affiliation(s)
- Phil M. Pithan
- Department of Chemistry and Biology, and Center of Micro- and Nanochemistry and EngineeringUniversity of SiegenAdolf-Reichwein-Str. 257068SiegenGermany
| | - Christopher Kuhlmann
- Department of Chemistry and Biology, and Center of Micro- and Nanochemistry and EngineeringUniversity of SiegenAdolf-Reichwein-Str. 257068SiegenGermany
| | - Carsten Engelhard
- Department of Chemistry and Biology, and Center of Micro- and Nanochemistry and EngineeringUniversity of SiegenAdolf-Reichwein-Str. 257068SiegenGermany
| | - Heiko Ihmels
- Department of Chemistry and Biology, and Center of Micro- and Nanochemistry and EngineeringUniversity of SiegenAdolf-Reichwein-Str. 257068SiegenGermany
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11
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Jeannot L, Bell M, Ashwell R, Volodkin D, Vikulina AS. Internal Structure of Matrix-Type Multilayer Capsules Templated on Porous Vaterite CaCO₃ Crystals as Probed by Staining with a Fluorescence Dye. MICROMACHINES 2018; 9:E547. [PMID: 30715046 PMCID: PMC6265917 DOI: 10.3390/mi9110547] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 10/19/2018] [Accepted: 10/23/2018] [Indexed: 12/24/2022]
Abstract
Multilayer capsules templated on decomposable vaterite CaCO₃ crystals are widely used as vehicles for drug delivery. The capsule represents typically not a hollow but matrix-like structure due to polymer diffusion into the porous crystals during multilayer deposition. The capsule formation mechanism is not well-studied but its understanding is crucial to tune capsule structure for a proper drug release performance. This study proposes new approach to noninvasively probe and adjust internal capsule structure. Polymer capsules made of poly(styrene-sulfonate) (PSS) and poly(diallyldimethylammonium chloride) (PDAD) have been stained with fluorescence dye rhodamine 6G. Physical-chemical aspects of intermolecular interactions required to validate the approach and adjust capsule structure are addressed. The capsules consist of a defined shell (typically 0.5⁻2 µm) and an internal matrix of PSS-PDAD complex (typically 10⁻40% of a total capsule volume). An increase of ionic strength and polymer deposition time leads to the thickening of the capsule shell and formation of a denser internal matrix, respectively. This is explained by effects of a polymer conformation and limitations in polymer diffusion through the crystal pores. We believe that the design of the capsules with desired internal structure will allow achieving effective encapsulation and controlled/programmed release of bioactives for advanced drug delivery applications.
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Affiliation(s)
- Lucas Jeannot
- Robert Schuman University Institute of Technology (IUT Robert Schuman), University of Strasbourg, 72 Route Du Rhin, 67411 Illkirch CEDEX, France.
| | - Michael Bell
- School of Science and Technology, Nottingham Trent University, Clifton Lane, Nottingham NG11 8NS, UK.
| | - Ryan Ashwell
- School of Science and Technology, Nottingham Trent University, Clifton Lane, Nottingham NG11 8NS, UK.
| | - Dmitry Volodkin
- School of Science and Technology, Nottingham Trent University, Clifton Lane, Nottingham NG11 8NS, UK.
- Department of Chemistry, Lomonosov Moscow State University, Leninskiye Gory 1-3, 119991 Moscow, Russia.
| | - Anna S Vikulina
- School of Science and Technology, Nottingham Trent University, Clifton Lane, Nottingham NG11 8NS, UK.
- Department Cellular Biotechnology & Biochips, Branch Bioanalytics and Bioprocesses (Fraunhofer IZI-BB), Fraunhofer Institute for Cell Therapy and Immunology, Am Mühlenberg 13, 14476 Potsdam-Golm, Germany.
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12
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Manoryk PA, Lampeka YD, Ermokhina NI, Tsymbal LV, Telbiz GM, Gurtovyi RI. Functional Titanium Dioxide-Derived Materials of Different Morphology and Metal–Organic Framework Compounds. THEOR EXP CHEM+ 2017. [DOI: 10.1007/s11237-017-9534-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Clay induced changes in the aggregation pattern of Safranine-O in hybrid Langmuir-Blogdgett (LB) films. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.08.053] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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14
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Kharchenko AY, Moskaeva OG, Klochaniuk OR, Marfunin MO, Mchedlov-Petrossyan NO. Effect of poly (sodium 4-styrenesulfonate) on the ionization constants of acid-base indicator dyes in aqueous solutions. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.05.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Aracena A, Rezende MC, Encinas MV, Vergara C, Vásquez SO. Aggregation phenomena in photobicyclised pyridinium salts. NEW J CHEM 2017. [DOI: 10.1039/c7nj02788e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Absorption and emission spectra of PQPBF4 and BPDTQClO4 in water provide evidence, supported by theoretical calculations, of H-aggregation in this solvent.
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Affiliation(s)
- A. Aracena
- Departamento de Ciencia de los Materiales
- Facultad de Ciencias Físicas y Matemáticas
- Universidad de Chile
- 2777 Santiago Chile
- Chile
| | - M. C. Rezende
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Santiago de Chile
- Chile
| | - M. V. Encinas
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Santiago de Chile
- Chile
| | - C. Vergara
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Santiago de Chile
- Chile
| | - S. O. Vásquez
- Departamento de Ciencia de los Materiales
- Facultad de Ciencias Físicas y Matemáticas
- Universidad de Chile
- 2777 Santiago Chile
- Chile
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16
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Mudliar NH, Pettiwala AM, Awasthi AA, Singh PK. On the Molecular Form of Amyloid Marker, Auramine O, in Human Insulin Fibrils. J Phys Chem B 2016; 120:12474-12485. [PMID: 27973839 DOI: 10.1021/acs.jpcb.6b10078] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Designing extrinsic fluorescence sensors for amyloid fibrils is a very active and important area of research. Recently, an ultrafast molecule rotor dye, Auramine O (AuO), has been projected as a fluorescent amyloid marker. It has been claimed that AuO scores better than the most extensively utilized gold-standard amyloid probe, Thioflavin-T (ThT). This advantage arises from the fact that AuO, in addition to its usual emission band (∼500 nm), also displays a large red-shifted emission band (∼560 nm), exclusively in the presence of human insulin fibril medium and not in the native protein or buffer media. On the contrary, for ThT, the emission maximum (∼490 nm) largely remains unchanged while going from protein to fibril. This otherwise unknown large red-shifted emission band of AuO, observed in the presence of human insulin fibrils, was tentatively attributed to a species formed upon fast proton dissociation from excited AuO. It was proposed that because of the long excited-state lifetime (∼1.8 ns) of AuO upon association with human insulin fibrils, this fast proton dissociation from excited AuO could be observed, which is otherwise not observed in buffer or native protein media, owing to its very short excited-state lifetime (∼1 ps). Herein, we show that despite the long excited-state lifetime of AuO in other fibrillar media (human serum albumin and lysozyme), the new red-shifted emission band at 560 nm is not observed, thus possibly suggesting a different origin of the red-shifted emission band of AuO in human insulin fibril medium. We convincingly show that this red-shifted band of AuO (∼560 nm) could be observed under conditions that promote dye aggregation, such as a premicellar concentration of surfactants and polyelectrolytes. These AuO aggregates display strong emission wavelength dependence of transient decay traces, similar to that for AuO in human insulin fibril medium. Detailed time-resolved emission spectral (TRES) measurements suggest that the AuO/premicellar surfactant and AuO/human insulin fibril system share similar features, such as a dynamic red-shift in TRES and an isoemissive point in the time-resolved area-normalized emission spectra, suggesting that the characteristic red-shifted emission band of AuO in human insulin fibril medium may arise from AuO aggregates.
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Affiliation(s)
- Niyati H Mudliar
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400 085, India
| | - Aafrin M Pettiwala
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400 085, India
| | - Ankur A Awasthi
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400 085, India
| | - Prabhat K Singh
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400 085, India
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17
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Terrón-Mejía KA, López-Rendón R, Goicochea AG. Electrostatics in dissipative particle dynamics using Ewald sums with point charges. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:425101. [PMID: 27541198 DOI: 10.1088/0953-8984/28/42/425101] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A proper treatment of electrostatic interactions is crucial for the accurate calculation of forces in computer simulations. Electrostatic interactions are typically modeled using Ewald-based methods, which have become some of the cornerstones upon which many other methods for the numerical computation of electrostatic interactions are based. However, their use with charge distributions rather than point charges requires the inclusion of ansatz for the solutions of the Poisson equation, since there is no exact solution known for smeared out charges. The interest in incorporating electrostatic interactions at the scales of length and time that are relevant for the study the physics of soft condensed matter has increased considerably. Using mesoscale simulation techniques, such as dissipative particle dynamics (DPD), allows us to reach longer time scales in numerical simulations, without abandoning the particulate description of the problem. The main problem with incorporating electrostatics into DPD simulations is that DPD particles are soft and those particles with opposite charge can form artificial clusters of ions. Here we show that one can incorporate the electrostatic interactions through Ewald sums with point charges in DPD if larger values of coarse-graining degree are used, where DPD is truly mesoscopic. Using point charges with larger excluded volume interactions, the artificial formation of ionic pairs with point charges can be avoided and one obtains correct predictions. We establish ranges of parameters useful for detecting boundaries where artificial formation of ionic pairs occurs. Lastly, using point charges we predict the scaling properties of polyelectrolytes in solvents of varying quality, and obtain predictions that are in agreement with calculations that use other methods and with recent experimental results.
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Affiliation(s)
- Ketzasmin A Terrón-Mejía
- Laboratorio de Bioingeniería Molecular a Multiescala, Facultad de Ciencias, Universidad Autónoma del Estado de México, Av. Instituto Literario 100, Toluca 50000, Estado de México, Mexico
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Mudliar NH, Sadhu B, Pettiwala AM, Singh PK. Evaluation of an Ultrafast Molecular Rotor, Auramine O, as a Fluorescent Amyloid Marker. J Phys Chem B 2016; 120:10496-10507. [DOI: 10.1021/acs.jpcb.6b07807] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Niyati H. Mudliar
- Radiation & Photochemistry Division, ‡Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Biswajit Sadhu
- Radiation & Photochemistry Division, ‡Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Aafrin M. Pettiwala
- Radiation & Photochemistry Division, ‡Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Prabhat K. Singh
- Radiation & Photochemistry Division, ‡Radiation Safety Systems Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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19
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Kumar P, Behl G, Sikka M, Chhikara A, Chopra M. Poly(ethylene glycol)-co-methacrylamide-co-acrylic acid based nanogels for delivery of doxorubicin. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2016; 27:1413-33. [PMID: 27383582 DOI: 10.1080/09205063.2016.1207588] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Polymeric nanogels have been widely explored for their potential application as delivery carriers for cancer therapeutics. The ability of nanogels to encapsulate therapeutics by simple diffusion mechanism and the ease of their fabrication to impart target specificity in addition to their ability to get internalized into target cells make them good candidates for drug delivery. The present study aims to investigate the applicability of poly(ethylene glycol)-co-methacrylamide-co-acrylic acid (PMA)-based nanogels as a viable option for the delivery of doxorubicin (DOX). The nanogels were synthesized by free radical polymerization in an inverse mini-emulsion and characterized by nuclear magnetic resonance spectroscopy ((1)H NMR), Fourier transform infrared spectroscopy, dynamic light scattering, transmission electron microscopy (TEM), X-ray diffraction and differential scanning calorimetry. DOX was physically incorporated into the nanogels (PMA-DOX) and the mechanism of its in vitro release was studied. TEM experiment revealed spherical morphology of nanogels and the hydrodynamic diameter of the neat nanogels was in the range of 160 ± 46.95 nm. The size of the nanogels increased from 235.1 ± 28.46 to 403.7 ± 89.89 nm with the increase in drug loading capacity from 4.68 ± 0.03 to 13.71 ± 0.01%. The sustained release of DOX was observed upto 80 h and the release rate decreased with increased loading capacity following anomalous release mechanism as indicated by the value of diffusion exponent (n = 0.64-0.75) obtained from Korsmeyer-Peppas equation. Further, cytotoxicity evaluation of PMA-DOX nanogels on HeLa cells resulted in relatively higher efficacy (IC50~5.88 μg/mL) as compared to free DOX (IC50~7.24 μg/mL) thus demonstrating that the preparation is potentially a promising drug delivery carrier.
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Affiliation(s)
- Parveen Kumar
- a Department of Chemistry , Dyal Singh College, University of Delhi , New Delhi , India
| | - Gautam Behl
- a Department of Chemistry , Dyal Singh College, University of Delhi , New Delhi , India.,b College of Pharmacy and Pharmaceutical Sciences , Florida A&M University , Tallahassee , FL , USA
| | - Manisha Sikka
- c Dr. B. R. Ambedkar Center for Biomedical Research , University of Delhi , New Delhi , India
| | - Aruna Chhikara
- a Department of Chemistry , Dyal Singh College, University of Delhi , New Delhi , India
| | - Madhu Chopra
- c Dr. B. R. Ambedkar Center for Biomedical Research , University of Delhi , New Delhi , India
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Caldera Villalobos M, Peláez Cid AA, Herrera González AM. Removal of textile dyes and metallic ions using polyelectrolytes and macroelectrolytes containing sulfonic acid groups. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2016; 177:65-73. [PMID: 27082258 DOI: 10.1016/j.jenvman.2016.04.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Revised: 03/14/2016] [Accepted: 04/03/2016] [Indexed: 06/05/2023]
Abstract
This work reports the removal of textile dyes and metallic ions by means of adsorption and coagulation-flocculation using two polyelectrolytes and two macroelectrolytes containing sulfonic acid groups. The adsorption of textile dyes was studied in aqueous solutions containing cationic dyes and in wastewater containing a vat dye. Also, removal of vat and naphthol dyes was studied using the process of coagulation-flocculation. The results show these materials possess elevated adsorption capacity, and they accomplished removal rates above 97% in aqueous solutions. The removal of the vat dye improved the quality of the wastewater notably, and an uncolored effluent was obtained at the end of the treatment. The treatment using adsorption decreased the values for coloration, conductivity, suspended solids, and pH. The removal of vat and naphthol dyes by means of coagulation-flocculation was studied as well, and removal rates of 90% were obtained. The polyelectrolytes and macroelectrolytes also proved effective in the adsorption of metallic ions in wastewater. The treatment using adsorption accomplished high removal rates of metallic ions, and it showed greater selectivity towards Cu(2+), Fe(3+) and Pb(2+). A decrease in the content of solids as well as the values for COD and conductivity was observed in the wastewater as well. The analyses of FT-IR indicated that cationic dyes and metallic ions were chemisorbed by means of ionic exchange.
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Affiliation(s)
- M Caldera Villalobos
- Doctorado en Ciencias de los Materiales, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca-Tulancingo Km 4.5 Colonia Carboneras, Mineral de la Reforma Hidalgo, C.P. 42184, Hidalgo, Mexico
| | - A A Peláez Cid
- Facultad de Ingeniería, Benemérita Universidad Autónoma de Puebla, Edificio ING1, Ciudad Universitaria, C.P. 72570, Puebla, Mexico
| | - Ana M Herrera González
- Laboratorio de Polímeros, Área Académica de Ciencias de la Tierra y Materiales, Instituto de Ciencias Básicas e Ingeniería, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca-Tulancingo Km 4.5 Colonia Carboneras, Mineral de la Reforma Hidalgo, C.P. 42184, Hidalgo, Mexico.
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Hansda C, Chakraborty U, Hussain SA, Bhattacharjee D, Paul PK. Layer-by-layer films and colloidal dispersions of graphene oxide nanosheets for efficient control of the fluorescence and aggregation properties of the cationic dye acridine orange. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2016; 157:79-87. [PMID: 26722674 DOI: 10.1016/j.saa.2015.12.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Revised: 10/09/2015] [Accepted: 12/05/2015] [Indexed: 06/05/2023]
Abstract
Chemically derived graphene oxide (GO) nanosheets have received great deal of interest for technological application such as optoelectronic and biosensors. Aqueous dispersions of GO become an efficient template to induce the association of cationic dye namely Acridine Orange (AO). Interactions of AO with colloidal GO was governed by both electrostatic and π-π stacking cooperative interactions. The type of dye aggregations was found to depend on the concentration of GO in the mixed ensemble. Spectroscopic calculations revealed the formation of both H and J-type dimers, but H-type aggregations were predominant. Preparation of layer-by-layer (LbL) electrostatic self-assembled films of AO and GO onto poly (allylamine hydrochloride) (PAH) coated quartz substrate is also reported in this article. UV-Vis absorption, steady state and time resolve fluorescence and Raman spectroscopic techniques have been employed to explore the detail photophysical properties of pure AO, AO/GO mixed solution and AO/GO LbL films. Scanning electron microscopy was also used for visual evidence of the synthesized nanodimensional GO sheets. The fluorescence quenching of AO in the presence of GO in aqueous solution was due to the interfacial photoinduced electron transfer (PET) from photoexcited AO to GO i.e. GO acts as an efficient quenching agent for the fluorescence emission of AO. The quenching is found to be static in nature. Raman spectroscopic results also confirmed the interaction of AO with GO and the electron transfer. The formation of AO/GO complex via very fast excited state electron transfer mechanism may be proposed as to prepare GO-based fluorescence sensor for biomolecular detection without direct labeling the biomolecules by fluorescent probe.
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Affiliation(s)
- Chaitali Hansda
- Department of Physics, Jadavpur University, Jadavpur, Kolkata 700032, India; Department of Physics, The University of Burdwan, Golapbag, Burdwan 713104, India
| | - Utsav Chakraborty
- Department of Physics, Jadavpur University, Jadavpur, Kolkata 700032, India
| | - Syed Arshad Hussain
- Department of Physics, Tripura University, Suryamaninagar, 799022, Tripura West, India
| | | | - Pabitra Kumar Paul
- Department of Physics, Jadavpur University, Jadavpur, Kolkata 700032, India.
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Sun Z, Du J, Yan L, Chen S, Yang Z, Jing C. Multifunctional Fe3O4@SiO2-Au Satellite Structured SERS Probe for Charge Selective Detection of Food Dyes. ACS APPLIED MATERIALS & INTERFACES 2016; 8:3056-3062. [PMID: 26760909 DOI: 10.1021/acsami.5b10230] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Nanofabrication of multifunctional surface-enhanced Raman scattering (SERS) substrates is strongly desirable but currently remains a challenge. The motivation of this study was to design such a substrate, a versatile core-satellite Fe3O4@SiO2-Au (FA) hetero-nanostructure, and demonstrate its use for charge-selective detection of food dye molecules as an exemplary application. Our experimental results and three-dimensional finite difference time domain (FDTD) simulation suggest that tuning the Au nanoparticle (NP) gap to sub-10 nm, which could be readily accomplished, substantially enhanced the Raman signals. Further layer-by-layer deposition of a charged polyelectrolyte on this magnetic SERS substrate induced active adsorption and selective detection of food dye molecules of opposite charge on the substrates. Molecular dynamics (MD) simulations suggest that the selective SERS enhancement could be attributed to the high affinity and close contact (within a 20 Å range) between the substrate and molecules. Density function theory (DFT) calculations confirm the charge transfer from food dye molecules to Au NPs via the polyelectrolytes. This multifunctional SERS platform provides easy separation and selective detection of charged molecules from complex chemical mixtures.
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Affiliation(s)
- Zhenli Sun
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, China
| | - Jingjing Du
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, China
| | - Li Yan
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, China
| | - Shu Chen
- Department of Physics, Xiamen University , Xiamen 361005, China
| | - Zhilin Yang
- Department of Physics, Xiamen University , Xiamen 361005, China
| | - Chuanyong Jing
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, China
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23
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Heyne B. Self-assembly of organic dyes in supramolecular aggregates. Photochem Photobiol Sci 2016; 15:1103-1114. [DOI: 10.1039/c6pp00221h] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Many scientists probably consider dye aggregation in solution a curse.
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Affiliation(s)
- Belinda Heyne
- Chemistry Department
- University of Calgary
- 2500 University Drive NW
- Calgary
- Canada T2N 1N4
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24
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Gurtovyi RI, Tsymbal LV, Shova S, Lampeka YD. Effect of Aggregation of Acridine Orange on the Luminescent Characteristics of Its Composites with a Zinc-Containing Coordination Polymer. THEOR EXP CHEM+ 2015. [DOI: 10.1007/s11237-015-9425-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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25
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Wexler A, Switalski S, Bennett G, Lindner K, Baptiste K, Slater G. Patterning microparticles on a template of aggregated cationic dye. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:1588-1595. [PMID: 25580619 DOI: 10.1021/la5032653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Patternwise aggregation of charged molecules on a surface is potentially a facile approach to generate a template on which to pattern oppositely charged microparticles. We report on the patterning of silica microparticles by a system comprising a photopatternable copolymer and an aggregate forming penta-cationic cyanine dye. A thin film of the copolymer, composed of a molar excess of styrenesulfonic acid oxime ester to cross-linkable glycidyl methacrylate monomomers, was exposed through a mask and neutralized, resulting in a pattern of hydrophobic areas, and where exposed, a hydrophilic cross-linked film with sodium poly(styrenesulfonate) domains. The occurrence and locus of aggregation of an aqueous solution of the dye, applied to the patterned surface was established by absorbance and fluorescence spectroscopy and atomic force microscopy. In exposed areas, dye is imbibed and aggregation induced in sodium styrenesulfonate domains internal to the layer, whereas in the unexposed areas the dye aggregates on the hydrophobic surface. Aqueous anionic silica microparticles applied to the dye treated patterned surface and then rinsed, are retained in the unexposed areas having cationic surface aggregates, but rejected from the exposed areas with internal dye aggregates as these areas retain net negative charge. Mask exposure, absent dye treatment, did not result in patterning as negatively charged microparticles were nowhere retained, and positively charged particles were everywhere retained. The extent of surface coverage by the dye in unexposed areas was deposition time dependent, and ranged from isolated patches covering about 20 percent of the polymer surface to a surface saturated layer, with silica particle patterning robust over the range of dye surface coverages studied. The force requirements to pattern the denser than water silica microparticles are identified, and particle and polymer film surface potentials that meet the critical repulsion force requirement are mapped using an established sphere-to-flat surface electric double layer (EDL) model.
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Affiliation(s)
- Allan Wexler
- Eastman Kodak Company, Research Laboratories , 1999 Lake Avenue, Rochester, New York , 14650
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26
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Sevimli S, Sagnella S, Macmillan A, Whan R, Kavallaris M, Bulmus V, Davis TP. The endocytic pathway and therapeutic efficiency of doxorubicin conjugated cholesterol-derived polymers. Biomater Sci 2015. [DOI: 10.1039/c4bm00224e] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Previously synthesized poly(methacrylic acid-co-cholesteryl methacrylate) P(MAA-co-CMA) copolymers were examined as potential drug delivery vehicles.
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Affiliation(s)
- Sema Sevimli
- The Centre for Advanced Macromolecular Design (CAMD)
- The University of New South Wales
- Sydney
- Australia
- Australian Centre for Nanomedicine (ACN)
| | - Sharon Sagnella
- Australian Centre for Nanomedicine (ACN)
- The University of New South Wales
- Sydney
- Australia
- Children's Cancer Institute Australia (CCIA)
| | - Alexander Macmillan
- Children's Cancer Institute Australia (CCIA)
- Lowy Cancer Research Centre
- The University of New South Wales
- Sydney
- Australia
| | - Renee Whan
- Children's Cancer Institute Australia (CCIA)
- Lowy Cancer Research Centre
- The University of New South Wales
- Sydney
- Australia
| | - Maria Kavallaris
- Australian Centre for Nanomedicine (ACN)
- The University of New South Wales
- Sydney
- Australia
- Children's Cancer Institute Australia (CCIA)
| | - Volga Bulmus
- Department of Chemical Engineering
- Biotechnology and Bioengineering Graduate Program
- Izmir Institute of Technology
- Urla
- Turkey
| | - Thomas P. Davis
- ARC Centre of Excellence in Convergent Bio-Nano Science & Technology
- Monash Institute of Pharmaceutical Sciences
- Monash University
- Melbourne
- Australia
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27
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Fradj AB, Lafi R, Hamouda SB, Gzara L, Hamzaoui AH, Hafiane A. Investigation on the interaction of Safranin T with anionic polyelectrolytes by spectrophotometric method. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 131:169-176. [PMID: 24830630 DOI: 10.1016/j.saa.2014.04.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Revised: 03/08/2014] [Accepted: 04/06/2014] [Indexed: 06/03/2023]
Abstract
Understanding the role played by chemical additives such as NaCl salt, acid and Cetylpyridinium Chloride (CPC) surfactant on the interaction between dye and polyelectrolyte contributes to optimization of processes using polyelectrolytes in the removal of dye from aqueous solution. Herein we focus in the interaction between Safranin T, a cationic dye, with two anionic polyelectrolytes, poly(ammonium acrylate) and poly(acrylic acid) using spectrophotometric method and conductivity measurement. In aqueous solution, each of anionic polyelectrolytes forms a complex with the dye and induces a metachromasy indicated by the blue shift of the absorbance of the dye. The stoichiometry of complexes evaluated by the molar ratio method are 1:1 for Safranin T poly(ammonium acrylate) and 2:1 in the case of Safranin T poly(acrylic acid). The effect of additives on the stability of complexes has been studied by varying concentrations of the salt and the surfactant and pH of the solution. The thermodynamic parameters of interaction ΔG, ΔH and ΔS at different temperatures were evaluated to determine the stability constant of the complexes.
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Affiliation(s)
- Anouar Ben Fradj
- Laboratory of Wastewater Treatment, CERTE, BP 273, Soliman 8020, Tunisia; Laboratory of Valorisation of Materials, CNRSM, BP 95, Hammam-Lif 2050, Tunisia.
| | - Ridha Lafi
- Laboratory of Wastewater Treatment, CERTE, BP 273, Soliman 8020, Tunisia
| | | | - Lassaad Gzara
- Center of Excellence in Desalination Technology, King Abdulaziz University, Jeddah, Saudi Arabia
| | | | - Amor Hafiane
- Laboratory of Wastewater Treatment, CERTE, BP 273, Soliman 8020, Tunisia.
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28
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Removal of methylene blue from aqueous solutions by poly(acrylic acid) and poly(ammonium acrylate) assisted ultrafiltration. Sep Purif Technol 2014. [DOI: 10.1016/j.seppur.2014.06.038] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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29
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Mondek J, Mravec F, Halasová T, Hnyluchová Z, Pekař M. Formation and dissociation of the acridine orange dimer as a tool for studying polyelectrolyte-surfactant interactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:8726-8734. [PMID: 25001412 DOI: 10.1021/la502011s] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Steady-state and time-resolved fluorescence and UV-vis techniques were used to study the formation and dissociation of acridine orange dimer in order to investigate hyaluronan-acridine orange, hyaluronan-CTAB (cetyltrimethylammonium bromide), polystyrenesulfonate-acridine orange, and polystyrenesulfonate-CTAB interactions in aqueous solution. Steady-state and time-resolved fluorescence and the dimer:monomer absorbance ratio of acridine orange (AO) were used to determine dimer formation on polymer chains of polyelectrolytes. Acridine orange clearly formed dimers on polystyrensulfonate chains as well as on hyaluronan, but we show that the electrostatic interaction is much weaker in the case of hyaluronan. After the addition of surfactant, we observed an enhancement of fluorescence intensity, indicating the dissociation of AO dimers into monomers and the replacement of acridine orange on polymer chains by surfactant molecules. Importantly, we show that surfactant molecules bind to polymer chains before the critical micelle concentration is reached and form the so-called "bottle-brush" structure.
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Affiliation(s)
- Jakub Mondek
- Brno University of Technology, Faculty of Chemistry, Institute of Physical and Applied Chemistry and Materials Research Centre , Purkyňova 464/118, 612 00 Brno, Czech Republic
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30
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Fradj AB, Lafi R, Hamouda SB, Gzara L, Hamzaoui AH, Hafiane A. Effect of chemical parameters on the interaction between cationic dyes and poly(acrylic acid). J Photochem Photobiol A Chem 2014. [DOI: 10.1016/j.jphotochem.2014.04.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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31
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Affiliation(s)
- Ashley M. Jolly
- Department of Chemistry, The University of Alabama, Tuscaloosa, AL35487-0336, USA
| | - Marco Bonizzoni
- Department of Chemistry, The University of Alabama, Tuscaloosa, AL35487-0336, USA
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Bhattacharjee J, Hussain SA, Bhattacharjee D. Control of H-dimer formation of acridine orange using nano clay platelets. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 116:148-153. [PMID: 23933551 DOI: 10.1016/j.saa.2013.07.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Revised: 07/01/2013] [Accepted: 07/16/2013] [Indexed: 06/02/2023]
Abstract
Acridine orange (AO) forms dimer even in aqueous solution. In layer-by-layer (LbL) film of AO dimeric sites predominate over monomeric sites. This communication reports the control of H-dimer of AO in LbL film by incorporating nano clay platelets. This was studied by using UV-Vis absorption spectroscopy. Atomic force microscopic (AFM) image of the LbL film was taken to confirm the presence of nano clay platelets in the LbL film.
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Affiliation(s)
- J Bhattacharjee
- Department of Physics, Tripura University, Suryamaninagar 799022, Tripura, India
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Markova LI, Malinovskii VL, Patsenker LD, Häner R. J- vs. H-type assembly: pentamethine cyanine (Cy5) as a near-IR chiroptical reporter. Chem Commun (Camb) 2013; 49:5298-300. [PMID: 23636273 DOI: 10.1039/c3cc42103a] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The DNA-enabled dimerization of pentamethine cyanine (Cy5) dyes was studied by optical methods. The value of cyanine as a chiroptical reporter using a monomer-to-dimer switch is demonstrated. The specific shape of the CD signal and its high intensity are a result of J-type assembly.
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Affiliation(s)
- Larysa I Markova
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
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Araya-Hermosilla R, Araya-Hermosilla E, Torres-Gallegos C, Alarcón-Alarcón C, Moreno-Villoslada I. Sensing Cu2+ by controlling the aggregation properties of the fluorescent dye rhodamine 6G with the aid of polyelectrolytes bearing different linear aromatic density. REACT FUNCT POLYM 2013. [DOI: 10.1016/j.reactfunctpolym.2013.07.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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35
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Navarro JRG, Liotta A, Faure AC, Lerouge F, Chaput F, Micouin G, Baldeck PL, Parola S. Tuning dye-to-particle interactions toward luminescent gold nanostars. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:10915-10921. [PMID: 23886357 DOI: 10.1021/la402222c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Light-matter interactions are of great interest for potential biological applications (bioimaging, biosensing, phototherapy). For such applications, sharp nanostructures exhibit interesting features since their extinction bands (surface plasmon resonance) cover a large bandwidth in the whole visible wavelength region due to the existence of "hot spots" located at the end of the tips. In this context, gold nanostars appear to be interesting objects. However, their study remains difficult, mainly due to complicated synthetic methods and further functionalization. This paper reports the synthesis, functionalization, and photophysics of luminescent hybrid gold nanostars prepared using a layer-by-layer (LbL) deposition method for the tuning of chromophore-to-particle distances together with the impact of the spectral overlap between the plasmon and the emission/absorption of the dyes. Several luminescent dyes with different optical signatures were selectively adsorbed at the nanoparticle surface. The optimized systems, exhibiting the highest luminescence recovery, clearly showed that overlap must be as low as possible. Also, the fluorescence intensities were quenched in close vicinity of the metal surface and revealed a distance-dependence with almost full recovery of the dyes emission for 11 LbL layers, which corresponded to 15 nm distances evaluated on dried samples. The photophysics of the luminescent core-shell particles were carried out in suspension and correlated with the response of isolated single objects.
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Affiliation(s)
- Julien R G Navarro
- Ecole Normale Supérieure de Lyon, CNRS, Université Lyon 1, Laboratoire de Chimie UMR 5182, 46, allée d'Italie, F-69364, Lyon cedex 07, France
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Melnikau D, Savateeva D, Susha A, Rogach AL, Rakovich YP. Strong plasmon-exciton coupling in a hybrid system of gold nanostars and J-aggregates. NANOSCALE RESEARCH LETTERS 2013; 8:134. [PMID: 23522305 PMCID: PMC3610247 DOI: 10.1186/1556-276x-8-134] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Accepted: 03/07/2013] [Indexed: 05/28/2023]
Abstract
Hybrid materials formed by plasmonic nanostructures and J-aggregates provide a unique combination of highly localized and enhanced electromagnetic field in metal constituent with large oscillator strength and extremely narrow exciton band of the organic component. The coherent coupling of localized plasmons of the multispiked gold nanoparticles (nanostars) and excitons of JC1 dye J-aggregates results in a Rabi splitting reaching 260 meV. Importantly, broad absorption features of nanostars extending over a visible and near-infrared spectral range allowed us to demonstrate double Rabi splitting resulting from the simultaneous coherent coupling between plasmons of the nanostars and excitons of J-aggregates of two different cyanine dyes.
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Affiliation(s)
- Dzmitry Melnikau
- CIC nanoGune Consolider, Tolosa Hiribidea 76, Donostia-San Sebastian 20018, Spain
| | - Diana Savateeva
- Centro de Física de Materiales (MPC, CSIC-UPV/EHU), Donostia International Physics Center (DIPC), Po Manuel de Lardizabal 5, Donostia-San Sebastian 20018, Spain
| | - Andrey Susha
- Centre for Functional Photonics (CFP), Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, SAR, People's Republic of China
| | - Andrey L Rogach
- Centre for Functional Photonics (CFP), Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, SAR, People's Republic of China
| | - Yury P Rakovich
- Centro de Física de Materiales (MPC, CSIC-UPV/EHU), Donostia International Physics Center (DIPC), Po Manuel de Lardizabal 5, Donostia-San Sebastian 20018, Spain
- IKERBASQUE, Basque Foundation for Science, Bilbao 48011, Spain
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Harada T, Kurihara M, Kuroda R, Moriyama H. On–Off Switching of the Novel Thermochromic Chiroptical Behavior of Pseudoisocyanine Driven by Association/Dissociation. CHEM LETT 2012. [DOI: 10.1246/cl.2012.1442] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Takunori Harada
- Department of Chemistry, Faculty of Science, Toho University
| | - Mai Kurihara
- Department of Chemistry, Faculty of Science, Toho University
| | - Reiko Kuroda
- Institute for Science and Technology, Tokyo University of Science
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Jiménez-Millán E, Giner-Casares JJ, Muñoz E, Martín-Romero MT, Camacho L. Self-assembly of Acridine Orange into H-aggregates at the air/water interface: tuning of orientation of headgroup. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:14888-14899. [PMID: 22029424 DOI: 10.1021/la2030236] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The surface active derivative of the organic dye Acridine Orange (N-10-dodecyl-acridine orange (DAO)) has been included in mixed Langmuir monolayers with stearic acid (SA). The maximum relative content on DAO for a stable mixed monolayer is a molar ratio of X(DAO) = 0.5. Brewster angle microscopy (BAM) reveals a high homogeneity at the micrometer level for the mixed monolayer in equimolar proportion (X(DAO) = 0.5), whereas the appearance of domains occurs for lower content of DAO, i.e., X(DAO) = 0.2 and 0.1. The aggregation of the DAO headgroup leads to well-defined H-aggregates at the air/water interface for those mixed monolayers with a low content of DAO. However, for the mixed monolayers enriched in DAO, e.g., X(DAO) = 0.5, the molecular crowding prevents the formation of defined supramolecular structures. Molecular organization and tilting of the DAO headgroup is quantitatively analyzed by in situ UV-visible reflection spectroscopy. The formation of H-aggregates of the DAO headgroup can be reversibly tuned with the applied surface pressure. A molecular mechanism for the conformational rearrangement of the DAO molecule is proposed using RM1 quantum semiempirical calculations.
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Affiliation(s)
- Eugenio Jiménez-Millán
- Department of Physical Chemistry and Applied Thermodynamics, University of Córdoba, Campus de Rabanales, Edificio Marie Curie, Córdoba, Spain E-14014
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Melnikau D, Savateeva D, Chuvilin A, Hillenbrand R, Rakovich YP. Whispering gallery mode resonators with J-aggregates. OPTICS EXPRESS 2011; 19:22280-22291. [PMID: 22109070 DOI: 10.1364/oe.19.022280] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We have studied the optical properties of a hybrid system consisting of cyanine dye J-aggregates attached to a spherical microcavity. A periodic structure of narrow peaks was observed in the photoluminescence spectrum of the J-aggregates, arising from the coupling between the emission of J-aggregates and the whispering gallery modes (WGMs) of the microcavity. The most striking result of our study is the observation of polarization sensitive mode damping caused by re-absorption of J-aggregate emission. This effect manifests itself in dominating emission from TM modes in the spectral region of J-aggregates absorption band where the TE modes are strongly suppressed. In contrast, the TE modes totally dominate emission spectrum in the region where absorption is negligible. We also demonstrate that the emission intensity can be further enhanced by depositing a hybrid layer of J-aggregates and Ag nanoparticles onto the spherical microcavity. Owing to the concerted action of WGMs and plasmonic hot spots in the Ag aggregates, we observe an enhanced Raman signal from the J-aggregates. Microcavities covered by J-aggregates and plasmonic nanoparticles could be thus useful for a variety of photonic applications in basic science and technology.
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Affiliation(s)
- Dzmitry Melnikau
- CIC nanoGune Consolider, Tolosa Hiribidea 76, Donostia-San-Sebastian, 20018, Spain
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40
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Wang J, Zeng L, Ding D, Li X, Zhang H, Zhao H, Fan J, Zhang W, He Y. Studies on the interaction of achiral cationic pseudoisocyanine with chiral metal complexes. Phys Chem Chem Phys 2011; 13:16741-7. [PMID: 21858357 DOI: 10.1039/c1cp20470j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The effect of chiral metal complexes ([Co(en)(3)]I(3)·H(2)O, cis-[CoBr(NH(3))(en)(2)]Br(2), K[Co(edta)]·2H(2)O and [Ru(phen)(3)](PF(6))(2)) on the polymer-bound J-aggregates in aqueous mixtures of pesudoisocyanine (PIC) iodine and poly(acrylic acid, sodium)(PAAS) have been studied by UV-vis absorption, circular dichroism (CD) and fluorescence spectra. At low concentration, the PIC monomers could self-assemble to form supermolecules by binding to each of the COO(-) groups on the polymer chains through electrostatic interactions. After the addition of chiral metal complexes to the formed PIC-PAAS J-aggregates, we found that only the chiral multiple π-conjugated phenanthroline metal complexes could transfer their metal-centered chiral information to the formed J-aggregates. The chiral J-aggregates showed a characteristic induced circular dichroism (ICD) in the visible region of J-band chromophore, and the ICD signals depend on the absolute configuration, concentration of the chiral multiple π-conjugated metal complexes, as well as temperature. More interestingly, the supramolecular chirality of the polymer supported PIC J-aggregates could be memorized even after the addition of an excess opposite chiral complex enantiomers. This is in sharp contrast to the behavior in the high concentrated NaCl induced PIC-J aggregates, in which the optical rotation of a mixture of two enantiomers varies linearly with their ratio.
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Affiliation(s)
- Jian Wang
- College of Chemistry and Chemical Engineering, Graduate University of Chinese Academy of Sciences, Beijing, China.
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41
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Kumar Paul P, Arshad Hussain S, Bhattacharjee D, Pal M. Adsorption of Cationic Laser Dye onto Polymer/Surfactant Complex Film. CHINESE J CHEM PHYS 2011. [DOI: 10.1088/1674-0068/24/03/348-352] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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42
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Le Bahers T, Labat F, Pauporté T, Lainé PP, Ciofini I. Theoretical Procedure for Optimizing Dye-Sensitized Solar Cells: From Electronic Structure to Photovoltaic Efficiency. J Am Chem Soc 2011; 133:8005-13. [DOI: 10.1021/ja201944g] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tangui Le Bahers
- Laboratoire d’Electrochimie, Chimie des Interfaces et Modélisation pour l’Energie, UMR 7575 CNRS, Ecole Nationale Supérieure de Chimie de Paris—Chimie ParisTech, 11 rue P. et M. Curie, 75231 Paris Cedex 05, France
| | - Frédéric Labat
- Laboratoire d’Electrochimie, Chimie des Interfaces et Modélisation pour l’Energie, UMR 7575 CNRS, Ecole Nationale Supérieure de Chimie de Paris—Chimie ParisTech, 11 rue P. et M. Curie, 75231 Paris Cedex 05, France
| | - Thierry Pauporté
- Laboratoire d’Electrochimie, Chimie des Interfaces et Modélisation pour l’Energie, UMR 7575 CNRS, Ecole Nationale Supérieure de Chimie de Paris—Chimie ParisTech, 11 rue P. et M. Curie, 75231 Paris Cedex 05, France
| | - Philippe P. Lainé
- Laboratoire ITODYS, UMR 7086 CNRS, Université Paris Diderot, Sorbonne Paris Cité, Bâtiment Lavoisier, 15 rue Jean Antoine de Baïf, 75205 Paris Cedex 13, France
| | - Ilaria Ciofini
- Laboratoire d’Electrochimie, Chimie des Interfaces et Modélisation pour l’Energie, UMR 7575 CNRS, Ecole Nationale Supérieure de Chimie de Paris—Chimie ParisTech, 11 rue P. et M. Curie, 75231 Paris Cedex 05, France
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43
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Electrochemical DNA biosensor for the detection of Trichoderma harzianum based on a gold electrode modified with a composite membrane made from an ionic liquid, ZnO nanoparticles and chitosan, and by using acridine orange as a redox indicator. Mikrochim Acta 2010. [DOI: 10.1007/s00604-010-0498-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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44
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Chandaluri CG, Patra A, Radhakrishnan TP. Polyelectrolyte-assisted formation of molecular nanoparticles exhibiting strongly enhanced fluorescence. Chemistry 2010; 16:8699-706. [PMID: 20575120 DOI: 10.1002/chem.201000502] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A polyelectrolyte-assisted reprecipitation method is developed to fabricate nanoparticles of highly soluble molecules. The approach is demonstrated by using a zwitterionic diaminodicyanoquinodimethane molecule bearing remote ammonium functionalities with high solubility in water as well as organic solvents. Nanoparticles are prepared by injecting aqueous solutions of this compound containing an optimum concentration of sodium poly(styrenesulfonate) into methanol. The strong fluorescence exhibited by the compound in the aggregated state is reflected in the enhanced fluorescence of the polyelectrolyte complex in water. The nanoparticles formed in the colloidal state manifest even stronger fluorescence, which leads to an overall enhancement by about 90 times relative to aqueous solutions of the pure compound. The conditions for achieving the emission enhancement are optimized and a model for the molecular-level interactions and aggregation effects is developed through a range of spectroscopy, microscopy, and calorimetry investigations and control experiments.
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Affiliation(s)
- Ch G Chandaluri
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India
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45
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Motorina AS, Tanaiko OY, Mazieres MR, Tel’biz GM. Physicochemical characteristics of hybrid films based on mesostructured silica modified with a cyanine dye. RUSS J APPL CHEM+ 2010. [DOI: 10.1134/s107042721005006x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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46
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Ruedas-Rama MJ, Alvarez-Pez JM, Orte A. Formation of Stable BOBO-3 H-Aggregate Complexes Hinders DNA Hybridization. J Phys Chem B 2010; 114:9063-71. [DOI: 10.1021/jp103131r] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Maria J. Ruedas-Rama
- Department of Physical Chemistry, Faculty of Pharmacy, University of Granada, Campus Cartuja, 18071 Granada, Spain
| | - Jose M. Alvarez-Pez
- Department of Physical Chemistry, Faculty of Pharmacy, University of Granada, Campus Cartuja, 18071 Granada, Spain
| | - Angel Orte
- Department of Physical Chemistry, Faculty of Pharmacy, University of Granada, Campus Cartuja, 18071 Granada, Spain
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47
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Lau V, Heyne B. Calix[4]arene sulfonate as a template for forming fluorescent thiazole orange H-aggregates. Chem Commun (Camb) 2010; 46:3595-7. [PMID: 20372742 DOI: 10.1039/c002128h] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The unexpected interaction between thiazole orange (TO) and calix[4]arene sulfonate is reported herein. H-Aggregates of TO switching on their fluorescence in solution are observed. Surprisingly, fluorescence enhancement is not linked to host-guest inclusion, but rather to calix[4]arene sulfonate serving as a template for several TO molecules.
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Affiliation(s)
- Vivian Lau
- Chemistry Department, University of Calgary, 2500 University drive N.W., T2N 1N4, Calgary, Canada
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48
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Batchelor EK, Gadde S, Kaifer AE. Host–guest control on the formation of pinacyanol chloride H-aggregates in anionic polyelectrolyte solutions. Supramol Chem 2010. [DOI: 10.1080/10610270903100931] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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49
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Abstract
H-aggregates of the cyanine dye Cy5 are formed during covalent linkage to the cationic macromolecule Poly(allylamine) (PAH). The nonfluorescent H-aggregates strongly restrict the usage of the dye for analytical purposes and prevent a quantitative determination of the labeled macromolecules. The behavior of the H-aggregates has been studied by investigation of the absorption and fluorescence spectra of the dye polymer in dependence on solvent, label degree and additional sulfonate groups. H-aggregate formation is caused by an inhomogeneous distribution of the Cy5 molecules on the polymer chain. The H-aggregates can be destroyed by conformational changes of the PAH induced by interactions with polyanions or in organic solvents. It has been found that the polymer labeling process in high content of organic solvents can prevent the formation of H-aggregates. The results offer a better understanding and improvement of the use of the Cy5 dye for labeling purposes in fluorescence detection of macromolecules.
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50
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Gadde S, Batchelor EK, Kaifer AE. Controlling the formation of cyanine dye H- and J-aggregates with cucurbituril hosts in the presence of anionic polyelectrolytes. Chemistry 2009; 15:6025-31. [PMID: 19402091 DOI: 10.1002/chem.200802546] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The presence of anionic polyelectrolytes enhances the tendency of cationic cyanine dyes to form aggregates in aqueous media. In this work we investigate the interactions between two cyanine dyes, pseudoisocyanine (PIC) and pinacyanol (PIN), with polystyrenesulfonate (PSS) as the key additive to develop J- and H-aggregates. We also take advantage of the binding properties of the cucurbit[7]uril (CB7) host to control formation of these aggregates through its host-guest interactions with the dye molecules. UV/Vis absorption spectroscopic studies clearly demonstrate the PSS-enhanced formation of J-aggregates in the case of PIC and H-aggregates in the case of PIN. Electrostatic interactions between the cyanine dye molecules and the polyelectrolyte chains assist the formation of J- or H-aggregates at very low dye concentrations (ca. 10 microM). Optimum development of dye aggregates was observed at a sulfonate/dye molar ratio of about 3:1. Departures from this stoichiometric ratio seem to perturb the optimal aggregate structure. Furthermore, the presence of CB7 was found to effectively disrupt the interactions responsible for dye aggregation. Thus, CB7 completely disrupts the J-aggregates formed by PIC and the H-aggregates (as well as lower concentrations of J-aggregates) formed by PIN. UV/Vis and emission spectroscopic studies clearly indicate that binding of CB7 to both dye molecules removes them from the aggregate structures. Our spectroscopic data clearly indicate that regulation of the relative molar ratios of dye, CB7 host, and polyelectrolyte sulfonate groups leads to a quantitative control of dye aggregation, yielding variable amounts of PIC J- and PIN H-aggregates in these solutions.
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Affiliation(s)
- Suresh Gadde
- Center for Supramolecular Science and Department of Chemistry, University of Miami, Coral Gables, FL 33124-0431, USA
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