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Usoltsev SD, Raitman OA, Shokurov AV, Marfin YS. Variety of steady and excited state interactions in BODIPY aggregates: photophysics in antisolvent systems and floating layers. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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Chernysheva AI, Karpova EA, Terentyeva DA, Tsivkovsky NS, Selivantev YM, Raitman OA, Gorlov MV, Soldatov MA. Degradable covalently-linked siloxane-phosphazene polymer for drug loading and releasing. REACT FUNCT POLYM 2022. [DOI: 10.1016/j.reactfunctpolym.2022.105491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Shokurov AV, Novak DN, Ostroverkhov PV, Grin MA, Zaytseva AV, Raitman OA, Moroté F, Cohen-Bouhacina T, Grauby-Heywang C, Selektor SL. Lipid monolayer as a simple model membrane for comparative assessment of the photodynamic therapy photosensitizer efficiency via macroscopic measurements. J Photochem Photobiol B 2020; 210:111958. [PMID: 32707424 DOI: 10.1016/j.jphotobiol.2020.111958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Revised: 07/06/2020] [Accepted: 07/08/2020] [Indexed: 11/17/2022]
Abstract
Cellular membrane is one of the main targets of photodynamic therapy. Its high complexity has led to the study of the efficiency of photosensitizers on artificial lipid systems mimicking membranes. However, the preliminary analysis of this efficiency remains limited due to difficulty of the model construction and/or implementation of the required measurement techniques. Hereby, we propose a quite simple way for the rapid comparative assessment of novel photosensitizers in terms of membrane photodegradation, based on simple and fast measurements, such as wetting angle and surface plasmon resonance spectroscopy. As a proof of concept, we applied this methodology to two bacteriopurpurinimide derivatives. We have shown in particular that such complementary techniques can be employed not only for the multiparametric monitoring of the kinetics of the photodegradation, but also for the comparison of the damaging efficiency of the photosensitizers in the lipid structures as well.
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Affiliation(s)
- A V Shokurov
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences, Leninsky pr. 31-4, Moscow 119071, Russia.
| | - D N Novak
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences, Leninsky pr. 31-4, Moscow 119071, Russia; MIREA-Russian Technological University, 78 Vernadsky Avenue, 119454 Moscow, Russia
| | - P V Ostroverkhov
- MIREA-Russian Technological University, 78 Vernadsky Avenue, 119454 Moscow, Russia
| | - M A Grin
- MIREA-Russian Technological University, 78 Vernadsky Avenue, 119454 Moscow, Russia
| | - A V Zaytseva
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences, Leninsky pr. 31-4, Moscow 119071, Russia
| | - O A Raitman
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences, Leninsky pr. 31-4, Moscow 119071, Russia
| | - F Moroté
- Laboratoire Ondes et Matière d'Aquitaine (LOMA), UMR-CNRS 5798, Université de Bordeaux, 351 cours de la Libération, Talence Cedex 33405, France
| | - T Cohen-Bouhacina
- Laboratoire Ondes et Matière d'Aquitaine (LOMA), UMR-CNRS 5798, Université de Bordeaux, 351 cours de la Libération, Talence Cedex 33405, France
| | - C Grauby-Heywang
- Laboratoire Ondes et Matière d'Aquitaine (LOMA), UMR-CNRS 5798, Université de Bordeaux, 351 cours de la Libération, Talence Cedex 33405, France
| | - S L Selektor
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences, Leninsky pr. 31-4, Moscow 119071, Russia
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Arslanov VV, Kalinina MA, Ermakova EV, Raitman OA, Gorbunova YG, Aksyutin OE, Ishkov AG, Grachev VA, Tsivadze AY. Hybrid materials based on graphene derivatives and porphyrin metal-organic frameworks. Russ Chem Rev 2019. [DOI: 10.1070/rcr4878] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Khatymov RV, Muftakhov MV, Tuktarov RF, Raitman OA, Shokurov AV, Pankratyev EY. Fragmentation and slow autoneutralization of isolated negative molecular ions of phthalocyanine and tetraphenylporphyrin. J Chem Phys 2019; 150:134301. [PMID: 30954040 DOI: 10.1063/1.5087182] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Macrocyclic tetrapyrrolic compounds, such as naturally occurring or artificial porphyrins and phthalocyanines, have unique and highly attractive properties for applications in medicine and technology. The interaction of free-base phthalocyanine (H2Pc) and tetraphenylporphyrin (H2TPP) molecules with low-energy (0-15 eV) electrons was studied in vacuo by means of negative ion resonant electron capture mass spectrometry. Close similarities in formation and decay of negative ions of these compounds were revealed. Efficient formation of long-lived molecular negative ions (MNIs) was observed in the incident electron energy range of 0-8 eV, unprecedentedly wide for organic compounds and comparable to the range characteristic to carbon atomic clusters, fullerenes. Experiments testify to the strong persistence of MNIs of both compounds to dissociative decay, isomerization, and electron autodetachment. Lifetimes of MNIs as a function of incident electron energy were measured and it was concluded that the isolated anions may retain additional electrons in a time scale of up to hundreds of seconds at standard temperature due to the high adiabatic electron affinity of these large molecules. For the representatives of dyes and photochromic compounds comprehensively studied in terms of interaction with light, the present work highlights yet another unique property of these molecules, namely the capability to attach and durably retain an additional electron of low, pre-ionization energy.
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Affiliation(s)
- Rustem V Khatymov
- Institute of Molecule and Crystal Physics-Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences (IMCP UFRC RAS), Prospekt Oktyabrya 151, Ufa 450075, Russia
| | - Mars V Muftakhov
- Institute of Molecule and Crystal Physics-Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences (IMCP UFRC RAS), Prospekt Oktyabrya 151, Ufa 450075, Russia
| | - Renat F Tuktarov
- Institute of Molecule and Crystal Physics-Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences (IMCP UFRC RAS), Prospekt Oktyabrya 151, Ufa 450075, Russia
| | - Oleg A Raitman
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences (IPCE RAS), Leninsky prospect, 31k4, Moscow 199071, Russia
| | - Alexander V Shokurov
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences (IPCE RAS), Leninsky prospect, 31k4, Moscow 199071, Russia
| | - Evgeniy Yu Pankratyev
- Institute of Molecule and Crystal Physics-Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences (IMCP UFRC RAS), Prospekt Oktyabrya 151, Ufa 450075, Russia
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Shokurov AV, Shcherbina MA, Bakirov AV, Alexandrova AV, Raitman OA, Arslanov VV, Chvalun SN, Selektor SL. Rational Design of Hemicyanine Langmuir Monolayers by Cation-Induced Preorganization of Their Structure for Sensory Response Enhancement. Langmuir 2018; 34:7690-7697. [PMID: 29874084 DOI: 10.1021/acs.langmuir.8b01369] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
This study takes a novel approach to the enhancement of receptor properties of thin-film sensors based on hemicyanine dyes with dithia-aza-crown-ionophoric moiety. By means of in situ UV-vis and X-ray reflectivity (XRR) measurements, it was revealed that the introduction of up to 0.25 mmol of Hg2+ under a preliminarily compressed monolayer, formed on pure water, does not lead to cation binding. This is due to the formation of "head-to-tail" aggregates (H-type), in which ionophoric group is blocked by the neighboring molecule. However, the presence of barium cations in the subphase under the forming Langmuir monolayer of the mentioned compound causes codirectional (head-to-head) orientation of chromoionophore fragments. This provides preorganization of a monolayer structure that facilitates the binding of complementary mercury cations, even in a compressed state: asymmetric sandwich complexes containing two dye molecules coordinate a Hg2+ cation between them. This complex structure was confirmed by molecular modeling based on the electron density distribution calculated from XRR measurement data. Such preorganization of supramolecular ensembles induced by cations, which do not participate in the complex formation with macroheterocyclic receptors, may have applications in fields where strict control of molecular orientation at the interface is required, such as nanoelectronics, sensorics, catalysis, etc.
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Affiliation(s)
- A V Shokurov
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences , Moscow 119071 , Russia
| | - M A Shcherbina
- National Research Centre "Kurchatov Institute" , Moscow 123098 , Russia
- Moscow Institute of Physics and Technology (State University) , Moscow Region 141701 , Russia
| | - A V Bakirov
- N.S. Enikopolov Institute of Synthetic Polymer Materials of Russian Academy of Sciences , Moscow 117393 , Russia
| | - A V Alexandrova
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences , Moscow 119071 , Russia
| | - O A Raitman
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences , Moscow 119071 , Russia
| | - V V Arslanov
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences , Moscow 119071 , Russia
| | - S N Chvalun
- National Research Centre "Kurchatov Institute" , Moscow 123098 , Russia
- N.S. Enikopolov Institute of Synthetic Polymer Materials of Russian Academy of Sciences , Moscow 117393 , Russia
| | - S L Selektor
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences , Moscow 119071 , Russia
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Zvyagina AI, Shiryaev AA, Baranchikov AE, Chernyshev VV, Enakieva YY, Raitman OA, Ezhov AA, Meshkov IN, Grishanov DA, Ivanova OS, Gorbunova YG, Arslanov VV, Kalinina MA. Layer-by-layer assembly of porphyrin-based metal–organic frameworks on solids decorated with graphene oxide. NEW J CHEM 2017. [DOI: 10.1039/c6nj03202h] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Planar MOFs grow on graphene oxide templates.
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Selector SL, Arslanov VV, Gorbunova YG, Raitman OA, Sheinina LS, Birin KP, Tsivadze AY. Redox-controlled multistability of double-decker cerium tetra-(15-crown-5)-phthalocyaninate ultrathin films. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424608000522] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The optical and electrochemical properties of novel double-decker cerium bis-tetra-15-crown-5-phthalocyaninate [ Ce ( R 4 Pc 2−)2]0 (R4Pc2− = [4,5,4',5',4",5",4'",5'"-tetrakis-(1,4,7,10,13-pentaoxapentadecamethylene)-phthalocyaninate-anion]) Langmuir-Blodgett and cast films were investigated. The particular feature of cerium ion in complex with tetra-15-crown-5-phthalocyanine is the stability of oxidation state +4 unlike other lanthanide metal centers. Cyclic voltammetry curves exhibited three stable redox states in the Langmuir-Blodgett and cast films. Redox processes in Langmuir-Blodgett films are reversible and reproducible at multiple scan procedures. The mechanisms of redox transformations in Langmuir-Blodgett films are suggested. We demonstrated that the well-defined structure of Langmuir-Blodgett film is essential for fast electron transfer within the planar system, in which the charge is delocalized along the conjugated assembly of uniformly ordered stacks of discotic crown-phthalocyaninate. Fast charge relaxation was observed in highly ordered Langmuir-Blodgett film whereas the electrochemically written redox states remained unchanged in unordered cast film. The combination of electrochemistry with surface plasmon resonance spectroscopy allowed us to demonstrate that stepwise change of potential in the range 200-850 mV induced the respective optical response, which can be observed as the change in resonance angle value. High-speed response and reversibility of the switching process between stable states may be utilized as the basis for switchable optoelectronic devices. Electrochemical multistability of cerium crown-phthalocyaninate provided a basis for developing a simple strategy to fabricate nanoelectromechanical systems with high efficiency and fast response. Our approach relies on the modulation of the distance between decks in a complex stack via redox-controlled change of metal center size that results in change of linear dimensions of the stacks. The reported results are valuable, not only because of their potential applications, for instance, in OFET and MEMS fabrication, but also from a fundamental point of view since they illustrate the interplay between the orientation of stacks bearing discotic aromatic molecules and charge transfer within such a planar assembly.
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Affiliation(s)
- Sofia L. Selector
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninsky Prosp. 31, Moscow 119991, Russia
| | - Vladimir V. Arslanov
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninsky Prosp. 31, Moscow 119991, Russia
| | - Yulia G. Gorbunova
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninsky Prosp. 31, Moscow 119991, Russia
| | - Oleg A. Raitman
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninsky Prosp. 31, Moscow 119991, Russia
| | - Larisa S. Sheinina
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninsky Prosp. 31, Moscow 119991, Russia
| | - Kirill P. Birin
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninsky Prosp. 31, Moscow 119991, Russia
| | - Aslan Yu. Tsivadze
- A. N. Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninsky Prosp. 31, Moscow 119991, Russia
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Turygin DS, Subat M, Raitman OA, Arslanov VV, König B, Kalinina MA. Cooperative self-assembly of adenosine and uridine nucleotides on a 2D synthetic template. Angew Chem Int Ed Engl 2007; 45:5340-4. [PMID: 16847858 DOI: 10.1002/anie.200600450] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Dmitry S Turygin
- Department of Physical Chemistry of Supramolecular Systems, Frumkin Institute of Physical Chemistry and Electrochemistry RAS, 31 Leninsky prospect, Moscow 119991, Russia
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Turygin DS, Subat M, Raitman OA, Selector SL, Arslanov VV, König B, Kalinina MA. Two-dimensional arrays of amphiphilic Zn2+-cyclens for guided molecular recognition at interfaces. Langmuir 2007; 23:2517-24. [PMID: 17263566 DOI: 10.1021/la0624079] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The sterically guided molecular recognition of nucleobases, phosphates, adenosine, and uridine nucleotides on Langmuir monolayers and Langmuir-Blodgett monolayers of amphiphilic mono- or bis(Zn2+-cyclen)s assembled on thiolated surfaces was investigated. The stepwise selective binding of metal ions, uracil, or phosphate by dicetyl cyclen monolayers with variously tuned structures at the air/water interface was corroborated by the measurements of the corresponding LB films deposited onto quartz crystals. Two types of recognition surfaces were fabricated from Zn2+-dicetyl cyclen. The surface covered with a complex preformed in the Langmuir monolayer was capable both of imide and of phosphate binding. The similar complex formed directly in an LB film on thiolated gold was inactive with respect to imide. The surface plasmon resonance measurements evidenced the stepwise assembly of complementary nucleotides on SAM/LB templates through consecutive phosphate-Zn2+-cyclen coordination. Base pairing between nucleotides resulted in a formation of A-U bilayers comprising two complementary monolayers. Finally, we report on SAM/LB patterns designed for divalent molecular recognition of uridine phosphate by amphiphilic bis(Zn2+-cyclen).
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Affiliation(s)
- Dmitry S Turygin
- Department of Physical Chemistry of Supramolecular Systems, Frumkin Institute of Physical Chemistry and Electrochemistry RAS, 31 Leninsky Prospect, Moscow 119991, Russia
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Zayats M, Raitman OA, Chegel VI, Kharitonov AB, Willner I. Probing antigen-antibody binding processes by impedance measurements on ion-sensitive field-effect transistor devices and complementary surface plasmon resonance analyses: development of cholera toxin sensors. Anal Chem 2002; 74:4763-73. [PMID: 12349981 DOI: 10.1021/ac020312f] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Impedance measurements on ISFET devices are employed to develop new immunosensors. The analysis of the transconductance curves recorded at variable frequencies, upon the formation of antigen-antibody complexes on the ISFET devices, allows determination of the biomaterial film thicknesses. Complementary surface plasmon resonance measurements of analogous biosensor systems, using Au-coated glass slides as support, reveal similar film thicknesses of the biomaterials and comparable detection limits. A dinitrophenyl antigen layer is immobilized on the ISFET gate as a sensing interface for the anti-dinitrophenyl antibody (anti-DNP-Ab). The anti-DNP-Ab is analyzed with a sensitivity that corresponds to 0.1 microg mL(-1). The assembly of the biotinylated anti-anti-DNP-Ab and avidin layers on the base anti-DNP-Ab layer is characterized by impedance measurements. The development of an ISFET-based sensor for the cholera toxin is described. The anti-cholera toxin antibody is immobilized on the ISFET device. The association of the cholera toxin (CT) to the antibody is monitored by the impedance measurements. The detection limit for analyzing CT is 1.0 x 10(-11) M.
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Affiliation(s)
- Maya Zayats
- Institute of Chemistry, The Hebrew University of Jerusalem, Israel
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Raitman OA, Patolsky F, Katz E, Willner I. Electrical contacting of glucose dehydrogenase by the reconstitution of a pyrroloquinoline quinone-functionalized polyaniline film associated with an Au-electrode: an in situ electrochemical SPR study. Chem Commun (Camb) 2002:1936-7. [PMID: 12271682 DOI: 10.1039/b205393d] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel method to generate an integrated electrically contacted glucose dehydrogenase electrode by the surface reconstitution of the apo-enzyme on a pyrroloquinoline quinone (PQQ)-modified polyaniline is described. In situ electrochemical surface plasmon resonance (SPR) is used to characterize the bioelectrocatalytic functions of the system.
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Affiliation(s)
- Oleg A Raitman
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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Raitman OA, Katz E, Bückmann AF, Willner I. Integration of polyaniline/poly(acrylic acid) films and redox enzymes on electrode supports: an in situ electrochemical/surface plasmon resonance study of the bioelectrocatalyzed oxidation of glucose or lactate in the integrated bioelectrocatalytic systems. J Am Chem Soc 2002; 124:6487-96. [PMID: 12033880 DOI: 10.1021/ja012680r] [Citation(s) in RCA: 226] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Electropolymerization of aniline in the presence of poly(acrylic acid) on Au electrodes yields a polyaniline/poly(acrylic acid) composite film, exhibiting reversible redox functions in aqueous solutions at pH = 7.0. In situ electrochemical-SPR measurements are used to identify the dynamics of swelling and shrinking of the polymer film upon the oxidation of the polyaniline (PAn) to its oxidized state (PAn(2+)) and the reduction of the oxidized polymer (PAn(2+)) back to its reduced state (PAn), respectively. Covalent attachment of N(6)-(2-aminoethyl)-flavin adenin dinucleotide (amino-FAD, 1) to the carboxylic groups of the composite polyaniline/poly(acrylic acid) film followed by the reconstitution of apoglucose oxidase on the functional polymer yields an electrically contacted glucose oxidase of unprecedented electrical communication efficiency with the electrode: electron-transfer turnover rate approximately 1000 s(-1) at 30 degrees C. In situ electrochemical-SPR analyses are used to characterize the bioelectrocatalytic functions of the biomaterial-polymer interface. The current responses of the bioelectrocatalytic system increase as the glucose concentrations are elevated. Similarly, the SPR spectra of the system are controlled by the concentration of glucose. The glucose concentration controls the steady-state concentration ratio of PAn/PAn(2+) in the film composition. Therefore, the SPR spectrum of the film measured upon its electrochemical oxidation is shifted from the spectrum typical for the oxidized PAn(2+) at low glucose concentration to the spectrum characteristic of the reduced PAn at high glucose concentration. Similarly, the polyaniline/poly(acrylic acid) film acts as an electrocatalyst for the oxidation of NADH. Accordingly, an integrated bioelectrocatalytic assembly was constructed on the electrode by the covalent attachment of N(6)-(2-aminoethyl)-beta-nicotinamide adenine dinucleotide (amino-NAD(+), 2) to the polymer film, and the two-dimensional cross-linking of an affinity complex formed between lactate dehydrogenase and the NAD(+)-cofactor units associated with the polymer using glutaric dialdehyde as a cross-linker. In situ electrochemical-SPR measurements are used to characterize the bioelectrocatalytic functions of the system. The amperometric responses of the system increase as the concentrations of lactate are elevated, and an electron-transfer turnover rate of 350 s(-1) between the biocatalyst and the electrode is estimated. As the PAn(2+) oxidizes the NADH units generated by the biocatalyzed oxidation of lactate, the PAn/PAn(2+) steady-state ratio in the film is controlled by the concentration of lactate. Accordingly, the SPR spectrum measured upon electrochemical oxidation of the film is similar to the spectrum of PAn(2+) at low lactate concentration, whereas the SPR spectrum resembles that of PAn at high concentrations of lactate.
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Affiliation(s)
- Oleg A Raitman
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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14
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Raitman OA, Katz E, Willner I, Chegel VI, Popova GV. Photonic Transduction of a Three-State Electronic Memory and of Electrochemical Sensing of NADH by Using Surface Plasmon Resonance Spectroscopy. Angew Chem Int Ed Engl 2001. [DOI: 10.1002/1521-3757(20011001)113:19<3761::aid-ange3761>3.0.co;2-p] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Raitman OA, Katz E, Willner I, Chegel VI, Popova GV. Photonic Transduction of a Three-State Electronic Memory and of Electrochemical Sensing of NADH by Using Surface Plasmon Resonance Spectroscopy This study is supported by the Israel Science Foundation administered by The Israel Academy of Sciences and Humanities. NADH=1,4-dihydronicotinamide adenine dinucleotide. Angew Chem Int Ed Engl 2001; 40:3649-3652. [PMID: 11592210 DOI: 10.1002/1521-3773(20011001)40:19<3649::aid-anie3649>3.0.co;2-z] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Oleg A. Raitman
- Institute of Chemistry and The Farkas Center for Light-Induced Processes The Hebrew University of Jerusalem, Jerusalem 91904 (Israel)
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