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Revisiting magnetic field effects in homogeneous medium and bio-mimicking environments with emphasis on acridine derivatives. J INDIAN CHEM SOC 2021. [DOI: 10.1016/j.jics.2021.100057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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2
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Behera RK, Sau A, Mishra L, Mondal S, Bera K, Kumar S, Basu S, Sarangi MK. Metal nanoparticle alters adenine induced charge transfer kinetics of vitamin K3 in magnetic field. Sci Rep 2020; 10:18454. [PMID: 33116189 PMCID: PMC7595215 DOI: 10.1038/s41598-020-75262-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 09/28/2020] [Indexed: 01/05/2023] Open
Abstract
In this article, we highlight the alterations in the photoinduced electron transfer (ET) and hydrogen atom transfer (HAT) pathways between an anti-tumor drug vitamin-K3 (MQ) and a nucleobase adenine (ADN) in the presence of gold (Au) and iron (Fe) nanoparticles (NPs). Inside the confined micellar media, with laser flash photolysis corroborated with an external magnetic field (MF), we have detected the transient geminate radicals of MQ and ADN, photo-generated through ET and HAT. We observe that the presence of AuNP on the MQ-ADN complex (AuMQ-ADN) assists HAT by limiting the ET channel, on the other hand, FeNP on the MQ-ADN complex (FeMQ-ADN) mostly favors a facile PET. We hypothesize that through selective interactions of the ADN molecules with AuNP and MQ molecules with FeNP, a preferential HAT and PET process is eased. The enhanced HAT and PET have been confirmed by the escape yields of radical intermediates by time-resolved transient absorption spectroscopy in the presence of MF.
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Affiliation(s)
| | - Abhishek Sau
- Chemical Sciences Division, Saha Institute of Nuclear Physics, Kolkata, India.,Department of Molecular and Cellular Medicine, Texas A&M University, College Station, USA
| | - Leepsa Mishra
- Department of Physics, Indian Institute of Technology Patna, Patna, India
| | - Sankalan Mondal
- Department of Physics, Indian Institute of Technology Patna, Patna, India
| | - Kallol Bera
- Chemical Sciences Division, Saha Institute of Nuclear Physics, Kolkata, India.,Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, USA
| | - Satish Kumar
- Department of Physics, Indian Institute of Technology Patna, Patna, India
| | - Samita Basu
- Chemical Sciences Division, Saha Institute of Nuclear Physics, Kolkata, India
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3
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Chakraborty B, Sengupta C, Pal U, Basu S. Probing the Hydrogen Bond Involving Acridone Trapped in a Hydrophobic Biological Nanocavity: Integrated Spectroscopic and Docking Analyses. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:1241-1251. [PMID: 31951141 DOI: 10.1021/acs.langmuir.9b03506] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Spectroscopic analyses reveal that acridone (AD) penetrates through the structure and enters the hydrophobic cavity of the protein β-lactoglobulin (βLG). Although the protein contains two tryptophan (Trp) residues, AD interacts with only one (Trp-19), which is authenticated by the appearance of a single isoemissive point in TRANES. Alteration in the secondary structure of the protein while AD pierces through βLG is evident from the circular dichroism spectroscopic study. The ground-state interaction between AD and βLG is proven from the UV-vis spectroscopic study and the static nature of quenching of intrinsic fluorescence of the protein by the ligand. The steady-state fluorescence study in varied temperatures indicates the involvement of hydrogen bonding in the ligand-protein interaction. Further, the time-resolved fluorescence anisotropy study gives a hint of the presence of a hydrogen bond in AD-βLG interaction, which possibly involves the rotamers of Trp-19. In fact, the idea of involvement of rotamers of Trp-19 is obtained from the increase in fluorescence lifetime of βLG in the presence of AD. The docking study agrees to the involvement of hydrogen bonding in AD-βLG interaction. The direct evidence of hydrogen bonding between Trp and AD is obtained from the laser flash photolysis studies where the signature of formation of ADH• and Trp• through hydrogen abstraction between Trp and AD, loosely bound through hydrogen bonding, gets prominence. Thus, binding of AD to βLG involves hydrogen bonding in a hydrophobic pocket of the protein.
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Affiliation(s)
- Brotati Chakraborty
- Department of Chemistry , Bejoy Narayan Mahavidyalaya , Hooghly, Itachuna , West Bengal 712147 , India
| | - Chaitrali Sengupta
- S.N. Bose National Centre for Basic Sciences , Kolkata , West Bengal 700106 , India
| | - Uttam Pal
- S.N. Bose National Centre for Basic Sciences , Kolkata , West Bengal 700106 , India
| | - Samita Basu
- Chemical Sciences Division , Saha Institute of Nuclear Physics , 1/AF Bidhannagar , Kolkata 700064 , India
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Hoang HM, Pham VTB, Grampp G, Kattnig DR. Magnetic Field-Sensitive Radical Pair Dynamics in Polymethylene Ether-Bridged Donor-Acceptor Systems. ACS OMEGA 2018; 3:10296-10305. [PMID: 30198006 PMCID: PMC6120740 DOI: 10.1021/acsomega.8b01232] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Accepted: 08/20/2018] [Indexed: 05/13/2023]
Abstract
Donor-acceptor systems forming exciplexes are versatile models for the study of magnetic field effects (MFEs) on charge recombination reactions. The MFEs originate from singlet-triplet interconversion within transient radical ion pairs (RIPs), which exist in a dynamic equilibrium with the exciplexes. Here, we describe the synthesis and MFEs of the chain-linked N,N-dimethylaniline (DMA)/9-methylanthracene (MAnt) donor-acceptor system MAnt-(CH2) n -O-CH2-CH2-DMA for n = 6, 8, 10, and 16. The MFEs are found to increase with increasing chain length. Effects as large as 37.5% have been observed for the long-chain compound with n = 16. The solvent dependence of the MFEs at magnetic field intensity 75 mT is reported. For the range of solvent static dielectric constants εs = 6.0-36.0, the MFEs go through a maximum for intermediate polarities, for which the direct formation of RIPs prevails and their dissociation and reencounter are balanced. Field-resolved measurements (MARY spectra) are reported for solutions in butyronitrile. The MARY spectra reveal that for n = 8, 10, 16, the average exchange interaction is negligible during the coherent lifetime of the radical pair. However, singlet-triplet dephasing broadens the lineshape; the shorter the linker, the more pronounced this effect is. For n = 6, a dip in the fluorescence intensity reveals a nonzero average exchange coupling of the order of ±5 mT. We discuss the field-dependence in the framework of the semiclassical theory taking spin-selective recombination, singlet-triplet dephasing, and exchange coupling into account. Singlet recombination rates of the order of 0.1 ns-1 and various degrees of singlet-triplet dephasing govern the spin dynamics. In addition, because of a small free energy gap between the exciplex and the locally excited fluorophore quencher pair, a fully reversible interconversion between the RIP, exciplex, and locally excited fluorophore is revealed by spectrally resolved MFE measurements for the long-chain systems (n = 10, 16).
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Affiliation(s)
- Hao Minh Hoang
- Ho
Chi Minh City University of Technology and Education, Vo Van Ngan 01, Linh Chieu Ward, Thu Duc District, Ho Chi Minh City 700000, Vietnam
- Institute
of Physical and Theoretical Chemistry, Graz
University of Technology, Stremayrgasse 9/I, A-8010 Graz, Austria
| | - Van Thi Bich Pham
- Institute
of Physical and Theoretical Chemistry, Graz
University of Technology, Stremayrgasse 9/I, A-8010 Graz, Austria
| | - Günter Grampp
- Institute
of Physical and Theoretical Chemistry, Graz
University of Technology, Stremayrgasse 9/I, A-8010 Graz, Austria
| | - Daniel R. Kattnig
- Living
Systems Institute and Department of Physics, University of Exeter, Stocker Road, Exeter, Devon EX4 4QD, United Kingdom
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5
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Koley Seth B, Saha A, Haldar S, Chakraborty PP, Saha P, Basu S. Structure dependent selective efficacy of pyridine and pyrrole based Cu(II) Schiff base complexes towards in vitro cytotoxicity, apoptosis and DNA-bases binding in ground and excited state. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2016; 162:463-472. [DOI: 10.1016/j.jphotobiol.2016.07.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Revised: 07/06/2016] [Accepted: 07/11/2016] [Indexed: 11/29/2022]
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6
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Chakraborty SD, Sau A, Kuznetsov DV, Banerjee A, Bardhan M, Bhattacharya M, Dasgupta D, Basu S, Senapati D. Development of a Triplet-Triplet Absorption Ruler: DNA- and Chromatin-Mediated Drug Molecule Release from a Nanosurface. J Phys Chem B 2016; 120:6872-81. [PMID: 27284775 DOI: 10.1021/acs.jpcb.6b05278] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Triplet-triplet (T-T) absorption spectroscopy has been used successfully as a molecular ruler to understand the actual release process of sanguinarine as a drug molecule from a gold nanoparticle surface in the presence of cell components, that is, DNA and chromatin. The obtained results have been verified by fluorescence and surface-enhanced Raman spectroscopy (SERS), and a plausible explanation has been put forward to describe the underestimation and overestimation of the percentage (%) of the release of drug molecules measured by fluorescence- and SERS-based techniques, respectively, over the highlighted T-T absorption spectroscopy. Because of the intrinsic nature of absorption, the reported T-T absorption spectroscopic assay overpowers fluorescence- and SERS-based assays, which are limited by the long-range interaction and nonlinear dependence of the concentration of analytes, respectively.
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Affiliation(s)
| | | | - Denis V Kuznetsov
- Department of Functional Nanosystems and High Temperature Materials, National University of Science and Technology 'MISiS' , Leninsky, Prospect 4, 119049 Moscow, Russia
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Mondal S, Chatti M, Mallick A, Purkayastha P. pH triggered reversible photoinduced electron transfer to and from carbon nanoparticles. Chem Commun (Camb) 2015; 50:6890-3. [PMID: 24838175 DOI: 10.1039/c4cc01669f] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dopamine functionalized carbon nanoparticles (CNPs) that can act as efficient photoinduced electron donor-acceptor systems depending on the pH of the medium have been synthesized. In acidic media, dopamine on CNPs exists as hydroquinone and serves as an electron donor while under alkaline conditions the corresponding quinone form of dopamine serves as a strong electron acceptor. Application of external NADH to the system can invert the donor-acceptor roles under alkaline conditions.
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Affiliation(s)
- Somen Mondal
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur Campus, Mohanpur 741252, India.
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Sengupta C, Sarangi MK, Sau A, Mandal D, Basu S. A case study of photo induced electron transfer between riboflavin and aliphatic amine: Deciphering different mechanisms of ET operating from femtosecond to microsecond time domain. J Photochem Photobiol A Chem 2015. [DOI: 10.1016/j.jphotochem.2014.09.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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9
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Hoang HM, Pham TB, Grampp G, Kattnig DR. Exciplexes versus Loose Ion Pairs: How Does the Driving Force Impact the Initial Product Ratio of Photoinduced Charge Separation Reactions? J Phys Chem Lett 2014; 5:3188-3194. [PMID: 25243054 PMCID: PMC4166680 DOI: 10.1021/jz501575r] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2014] [Accepted: 08/29/2014] [Indexed: 05/24/2023]
Abstract
Many donor-acceptor systems can undergo a photoinduced charge separation reaction, yielding loose ion pairs (LIPs). LIPs can be formed either directly via (distant) electron transfer (ET) or indirectly via the dissociation of an initially formed exciplex or tight ion pair. Establishing the prevalence of one of the reaction pathways is challenging because differentiating initially formed exciplexes from LIPs is difficult due to similar spectroscopic footprints. Hence, no comprehensive reaction model has been established for moderately polar solvents. Here, we employ an approach based on the time-resolved magnetic field effect (MFE) of the delayed exciplex luminescence to distinguish the two reaction channels. We focus on the effects of the driving force of ET and the solvent permittivity. We show that, surprisingly, the exciplex channel is significant even for an exergonic ET system with a free energy of ET of -0.58 eV and for the most polar solutions studied (butyronitrile). Our findings demonstrate that exciplexes play a crucial role even in polar solvents and at moderate driving forces, contrary to what is usually assumed.
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Affiliation(s)
- Hao Minh Hoang
- Institute of Physical
and Theoretical Chemistry, Graz University of Technology, Streymayrgasse 9/I, A-8010 Graz, Austria
| | - Thi Bich
Van Pham
- Institute of Physical
and Theoretical Chemistry, Graz University of Technology, Streymayrgasse 9/I, A-8010 Graz, Austria
| | - Günter Grampp
- Institute of Physical
and Theoretical Chemistry, Graz University of Technology, Streymayrgasse 9/I, A-8010 Graz, Austria
| | - Daniel R. Kattnig
- Physical
and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, United Kingdom
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10
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Bose A, Basu S. Effect of phosphate group in switching off electron transfer in different media. J Mol Liq 2014. [DOI: 10.1016/j.molliq.2013.11.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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11
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Koley Seth B, Ray A, Saha A, Saha P, Basu S. Potency of photoinduced electron transfer and antioxidant efficacy of pyrrole and pyridine based Cu(II)-Schiff complexes while binding with CT-DNA. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2014; 132:72-84. [PMID: 24602815 DOI: 10.1016/j.jphotobiol.2014.02.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Revised: 01/18/2014] [Accepted: 02/06/2014] [Indexed: 10/25/2022]
Abstract
Here we report a systematic and comparative study to define a correlation between the structure and function of a series of simple, biologically active small inorganic Schiff base copper complexes for the occurrence of charge transfer phenomenon in calf thymus DNA (CT-DNA) using transient absorption spectroscopy corroborated with magnetic field effect. Four copper(II) Schiff base complexes with differently substituted heterocyclic ligands with antioxidant activity have been used. The binding constants of the order of ∼ 10(4) support the moderate binding affinity of the complexes towards CT-DNA. The methyl-substituted pyrrole complex shows maximum binding affinity (Kb: 8.33 × 10(4)) compared to others. The occurrence of photoinduced electron transfer (PET) from CT-DNA to pyrrole containing complexes has been confirmed by identifying the corresponding transient radical ions whereas the extent of PET with pyridine substituted complexes is too small to be observed. The increase of the yield of radical ions in presence of magnetic field depicts that the initial spin correlation in geminate radical ion pair is triplet. The difference between experimental and calculated B½ values, the measure of hyperfine interactions (HFI) present in the system, arises due to hole hopping through intrastrand and interstrand DNA bases. The unsubstituted pyrrole complexes cleave DNA much more than the methyl-substituted one. Therefore, the probability of intrastrand superexchange increases with methyl-substituted complexes, that reduces the rate of hole hopping and hence the B½ value.
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Affiliation(s)
- Banabithi Koley Seth
- Chemical Science Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India
| | - Aurkie Ray
- Chemical Science Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India
| | - Arpita Saha
- Crystallography and Molecular Biology, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India
| | - Partha Saha
- Crystallography and Molecular Biology, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India
| | - Samita Basu
- Chemical Science Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India.
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Pal K, Grampp G, Kattnig DR. Solvation dynamics of a radical ion pair in micro-heterogeneous binary solvents: a semi-quantitative study utilizing MARY line-broadening experiments. Chemphyschem 2013; 14:3389-99. [PMID: 23939826 DOI: 10.1002/cphc.201300435] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Revised: 07/15/2013] [Indexed: 11/10/2022]
Abstract
This work aims at elucidating the mechanism of solvation of a radical ion pair (RIP) in a micro-heterogeneous binary solvent mixture using magnetically affected reaction yield (MARY) spectroscopy. For the exciplex-forming 9,10-dimethylanthracene/N,N-dimethylaniline system a comparative, composition-dependent MARY line-broadening study is undertaken in a heterogeneous (toluene/dimethylsulfoxide) and a quasi-homogenous (propyl acetate/butyronitrile) solvent mixture. The half-saturation field extrapolated to zero-quencher concentration, B(1/2), and the self-exchange rate constants are analyzed in the light of solvent dynamical properties of the mixtures and a dielectric continuum solvation model. The dependence of B(1/2) on the solvent composition is explained by cluster formation giving rise to shortened RIP lifetimes. The results are in qualitative agreement with the continuum solvation model suggesting that it could serve as a theoretical basis for quantitative modeling.
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Affiliation(s)
- Kunal Pal
- Institute of Physical and Theoretical Chemistry, Graz University of Technolgy, Stremayrgasse 9/Z2, A-8010 Graz (Austria).
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13
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Gonzalez MM, Rasse-Suriani FAO, Franca CA, Diez RP, Gholipour Y, Nonami H, Erra-Balsells R, Cabrerizo FM. Photosensitized electron transfer within a self-assembled norharmane-2'-deoxyadenosine 5'-monophosphate (dAMP) complex. Org Biomol Chem 2012; 10:9359-72. [PMID: 23111419 DOI: 10.1039/c2ob26462e] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Norharmane is a compound that belongs to a family of alkaloids called β-carbolines (βCs). These alkaloids are present in a wide range of biological systems, playing a variety of significant photo-dependent roles. Upon UV-A irradiation, βCs are able to act as efficient photosensitizers. In this work, we have investigated the photosensitized oxidation of 2'-deoxyadenosine 5'-monophosphate (dAMP) by norharmane in an aqueous phase, upon UV-A (350 nm) irradiation. The effect of the pH was evaluated on both the interactions between norharmane and dAMP in the ground and electronic excited states, and on the dAMP photosensitized oxidation. A quite strong static interaction between norharmane and dAMP was observed, especially under those pH conditions where the protonated form of the alkaloid is present (pH < 7). Theoretical studies were performed to further characterize the static complex structure. The participation of reactive oxygen species (ROS) in the photosensitized reaction was also investigated and the photoproducts were characterized by means of UV-LDI-MS and ESI-MS. All the data provided herein indicate that electron transfer (Type I) within a self-assembled norharmane-dAMP complex is the operative mechanism in the dAMP photosensitization.
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Affiliation(s)
- M Micaela Gonzalez
- CIHIDECAR - CONICET, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, 3p, Ciudad Universitaria, (1428) Buenos Aires, Argentina
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14
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Nguyen TX, Kattnig D, Mansha A, Grampp G, Yurkovskaya AV, Lukzen N. Kinetics of photoinduced electron transfer between DNA bases and triplet 3,3',4,4'-benzophenone tetracarboxylic acid in aqueous solution of different pH's: proton-coupled electron transfer? J Phys Chem A 2012; 116:10668-75. [PMID: 23038981 PMCID: PMC3557938 DOI: 10.1021/jp307122h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The kinetics of triplet state quenching of 3,3',4,4'-benzophenone tetracarboxylic acid (BPTC) by DNA bases adenine, adenosine, thymine, and thymidine has been investigated in aqueous solution using time-resolved laser flash photolysis. The observation of the BPTC ketyl radical anion at λ(max) = 630 nm indicates that one electron transfer is involved in the quenching reactions. The pH-dependence of the quenching rate constants is measured in detail. As a result, the chemical reactivity of the reactants is assigned. The bimolecular rate constants of the quenching reactions between triplet BPTC and adenine, adenosine, thymine, and thymidine are k(q) = 2.3 × 10(9) (4.7 < pH < 9.9), k(q) = 4.0 × 10(9) (3.5 < pH < 4.7), k(q) = 1.0 × 10(9) (4.7 < pH < 9.9), and k(q) = 4.0 × 10(8) M(-1) s(-1) (4.7 < pH < 9.8), respectively. Moreover, it reveals that in strong basic medium (pH = 12.0) a keto-enol tautomerism of thymine inhibits its reaction with triplet BPTC. Such a behavior is not possible for thymidine because of its deoxyribose group. In addition, the pH-dependence of the apparent electrochemical standard potential of thymine in aqueous solution was investigated by cyclic voltammetry. The ΔE/ΔpH ≈ -59 mV/pH result is characteristic of proton-coupled electron transfer. This behavior, together with the kinetic analysis, leads to the conclusion that the quenching reactions between triplet BPTC and thymine involve one proton-coupled electron transfer.
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Affiliation(s)
- Truong X Nguyen
- Institute of Physical and Theoretical Chemistry, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria.
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15
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Sarangi MK, Basu S. Associated electron and proton transfer between Acridine and Triethylamine in AOT reverse micelles probed by laser flash photolysis with magnetic field. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.03.035] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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16
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Zhang QD, Piro B, Noël V, Reisberg S, Pham MC. Functionalization of single-walled carbon nanotubes for direct and selective electrochemical detection of DNA. Analyst 2011; 136:1023-8. [DOI: 10.1039/c0an00486c] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Chakraborty B, Basu S. Interaction of proflavin with aromatic amines in homogeneous and micellar media: Photoinduced electron transfer probed by magnetic field effect. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.01.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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18
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Kiryutin AS, Ivanov KL, Morozova OB, Yurkovskaya AV, Vieth HM, Pirogov YA, Sagdeev RZ. TR-CIDNP as tool for quantitative analysis of hyperfine couplings in elusive radicals. DOKLADY PHYSICAL CHEMISTRY 2009. [DOI: 10.1134/s0012501609090061] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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19
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Bose A, Basu S. Laser Flash Photolysis and Magnetic Field Effect Studies on the Interaction of Uracil and Its Derivatives with Menadione and 9,10-Anthraquinone. J Phys Chem A 2008; 112:12045-53. [DOI: 10.1021/jp805632j] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Adity Bose
- Chemical Sciences Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata−700 064, India
| | - Samita Basu
- Chemical Sciences Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata−700 064, India
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20
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Bose A, Dey D, Basu S. Interactions of Guanine and Guanosine Hydrates with Quinones: A Laser Flash Photolysis and Magnetic Field Effect Study. J Phys Chem A 2008; 112:4914-20. [DOI: 10.1021/jp711846n] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Adity Bose
- Chemical Sciences Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata −700 064, India
| | - Debarati Dey
- Chemical Sciences Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata −700 064, India
| | - Samita Basu
- Chemical Sciences Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata −700 064, India
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21
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Interaction of 9,10-anthraquinone with adenine and 2'-deoxyadenosine. Biophys Chem 2008; 136:59-65. [PMID: 18508186 DOI: 10.1016/j.bpc.2008.04.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2008] [Revised: 04/28/2008] [Accepted: 04/28/2008] [Indexed: 11/21/2022]
Abstract
Laser flash photolysis has been used for the study of the interaction of 9,10-anthraquinone (AQ) with the DNA base, adenine (A) and its corresponding nucleoside, 2'-deoxyadenosine (dA). This study has provided two very important observations. AQ has been found to support electron transfer in different categories of media, acetonitrile/water on one hand and SDS micelles on other. While in our earlier work 2-methyl 1,4-naphthoquinone was found to undergo a switchover in reactivity (J. Am. Chem. Soc. 126 (2004) 10589-10593). Again A and dA are found to behave differently on account of an extra sugar unit, which not only affects the rate of reaction but the reaction pathway has been found to be modified too.
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Bose A, Dey D, Basu S. Laser flash photolysis and magnetic-field-effect studies on interaction of thymine and thymidine with menadione: role of sugar in controlling reaction pattern. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2008; 9:024205. [PMID: 27877956 PMCID: PMC5099713 DOI: 10.1088/1468-6996/9/2/024205] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2007] [Revised: 05/20/2008] [Accepted: 12/17/2007] [Indexed: 06/06/2023]
Abstract
The magnetic field effect (MFE) in conjunction with laser flash photolysis has been used for the study of the interaction of one of the small drug like quinone molecules, 2-methyl, 1,4-naphthoquinone, commonly known as menadione (MQ), with one of the DNA bases, thymine (THN), and its corresponding nucleoside, thymidine (THDN), in acetonitrile (ACN) and sodium dodecylsulfate (SDS) micelles. It has been observed that THN undergoes electron transfer (ET) and hydrogen (H) abstraction with MQ, while THDN undergoes only H abstraction in both the media. However, our earlier studies showed that a purine base, adenine (ADN), and its nucleoside, 2'-deoxyadenosine (ADS), undergo ET in ACN and H abstraction in SDS. Here we have attempted to explain the differences in the reactions of these DNA bases with MQ. We also reveal the crucial role of a sugar unit in altering the behavior of purine and pyrimidine bases with respect to ET and H abstraction.
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Affiliation(s)
| | | | - Samita Basu
- Chemical Sciences Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata – 700 064, India
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Bergeron F, Klarskov K, Hunting DJ, Wagner JR. Near-UV Photolysis of 2-Methyl-1,4-naphthoquinone−DNA Duplexes: Characterization of Reversible and Stable Interstrand Cross-Links between Quinone and Adenine Moieties. Chem Res Toxicol 2007; 20:745-56. [PMID: 17397192 DOI: 10.1021/tx6002968] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Near-UV photolysis of 2-methyl-1,4-naphthoquinone (MQ, menadione) tethered DNA induces initial charge transfer followed by either transport of the damage to G or the formation of interstrand cross-links between MQ and DNA bases. In this work, the products responsible for interstrand cross-links have been characterized by mass spectrometry, NMR, and comparison with model compounds. Three major products were formed in the photolysis of MQ-DNA duplexes. Two of the products (isomers) have a cross-link between C2 of a 2,3-saturated MQ moiety and N6 of a dAdo moiety. These products readily convert back to MQ and dAdo upon heating in neutral solution, and thus, they lead to reversible cross-links in MQ-DNA duplexes. The third product has a cross-link between C3 of a 2,3-unsaturated MQ moiety and N6 of an dAdo moiety. This product was stable in neutral solution. The formation of MQ to A cross-links in DNA may be explained by the coupling of MQ radicals that arise from the protonation of MQ radical anions, together with adenin-N6-yl radicals that arise from the deprotonation of A radical cations.
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Affiliation(s)
- François Bergeron
- Group in the Radiation Sciences, Department of Pharmacology, Faculté de Médecine et des Sciences de la Santé, Université de Sherbrooke, Sherbrooke, Quebec J1H 4N5, Canada
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Bose A, Dey D, Basu S. Structure-dependent switchover of reaction modes: A laser flash photolysis and magnetic field effect study. J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2006.07.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Dey D, Bose A, Chakraborty M, Basu S. Magnetic Field Effect on Photoinduced Electron Transfer between Dibenzo[a,c]phenazine and Different Amines in Acetonitrile−Water Mixture. J Phys Chem A 2007; 111:878-84. [PMID: 17266228 DOI: 10.1021/jp0661802] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Unlike the simple phenazine (PZ) molecule, one of its derivatives, dibenzo[a,c]phenazine (DBPZ) forms a charge-transfer complex in the triplet state (3ECT) with different amines, e.g., N,N-dimethylaniline (DMA), 4,4'-bis(dimethylamino)diphenylmethane (DMDPM), and triethylamine (TEA). Formation of the 3ECT and radical ion pairs (RIPs) due to electron transfer is identified by laser flash photolysis. The RIPs are much more abundant in the cases of DMA and DMDPM rather than in TEA. Interestingly, a prominent magnetic field effect (MFE) is observed in both the cases of 3ECT and RIPs in homogeneous acetonitrile-water (MeCN/H2O) mixtures. This rare observation of the 3ECT and MFE in non-viscous medium could be explained by considering the extended planar structure of DBPZ and inter-radical hydrogen bonding, mediated by the intervening water molecules. The magnetic field behavior is consistent with the hyperfine mechanism; however, the low B1/2 value for DBPZ-TEA system is ascribed to fast electron exchange due to the close proximity of the corresponding radical ions.
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Affiliation(s)
- Debarati Dey
- Chemical Sciences Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700 064, India
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Goyal RN, Dhawan A. Oxidation chemistry of 2′-deoxyadenosine at pyrolytic graphite electrode. Bioelectrochemistry 2006; 69:223-33. [PMID: 16675309 DOI: 10.1016/j.bioelechem.2006.03.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2006] [Revised: 02/27/2006] [Accepted: 03/15/2006] [Indexed: 11/29/2022]
Abstract
The electrochemical oxidation of 2'-deoxyadenosine has been investigated in phosphate containing supporting electrolytes in pH range 2-10 at a pyrolytic graphite electrode by cyclic sweep voltammetry, spectral studies, controlled potential electrolysis and related techniques. The oxidation of 2'-deoxyadenosine occurred in a single well-defined oxidation peak (I(a)), over the entire pH range. The electrooxidation occurred by the loss of 6.0+/-0.5 e(-) per mole over the entire pH range. The kinetics of the decay of the UV-absorbing intermediates has been studied and found to follow pseudo first order kinetics having rate constant (k) in the range (5.7-7.7)x10(-4) s(-1). The major products of electrooxidation were separated by HPLC and characterized by GC-MS/MS, (1)H NMR and a tentative mechanism for electrooxidation of 2'-deoxyadenosine has been suggested.
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Affiliation(s)
- Rajendra N Goyal
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247 667, India.
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