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  • 1.
    Blum, Zoltan
    et al.
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Pankratov, Dmitry
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Powering electronic contact lenses: current achievements, challenges, and perspectives2014In: Expert Review of Ophthalmology, ISSN 1746-9902, Vol. 9, no 4, p. 269-273Article in journal (Refereed)
    Abstract [en]

    The recent media hoopla regarding ‘smart’, ‘bionic’, or more appropriately, electronically augmented contact lenses is analyzed in terms of real achievements coupled to the critically important issue of power management. Not depending on the availability, currently or in the near future, of to-the-purpose discrete or integrated electronic devices, power management, including delivery/supply and temporal sustainability, will be an outstanding issue if present-day technology should remain the only option. Radically different approaches have been taken to deliver electric power to electronically augmented contact lenses, that is, ranging from quite simplistic wire-based delivery assemblies, grossly inappropriate for end users, to various elaborate wireless designs drawing on over-the-air power delivery, as well as solar and electrochemical cells. Nonetheless, given the complex restrictions offered by a contact lens, conventional, even state-of-the-art, power management technology is at an impasse, and to ensure a bright future for smart lenses, radical technological measures need to be taken. Bridging the conceptual gap between fuel cells and supercapacitors, an ingenious novel approach to on-lens power management is presented: a charge-storing fuel cell, or alternatively, a self-charging capacitor, that is, a hybrid electric power device.

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  • 2.
    Falk, Magnus
    et al.
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Pankratov, Dmitry
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Blum, Zoltan
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Direct-Electron-Transfer-Based Enzymatic Fuel Cells In Vitro, Ex Vivo, and In Vivo2014In: Implantable Bioelectronics / [ed] Evgeny Katz, John Wiley & Sons, 2014Chapter in book (Other academic)
  • 3.
    Falk, Magnus
    et al.
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Pankratov, Dmitry
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Lindh, Liselott
    Malmö högskola, Faculty of Odontology (OD).
    Arnebrant, Thomas
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Miniature direct electron transfer based enzymatic fuel cell operating in human sweat and saliva2014In: Fuel Cells, ISSN 1615-6846, E-ISSN 1615-6854, Vol. 14, no 6, p. 1050-1056Article in journal (Refereed)
    Abstract [en]

    We present data on operation of a miniature membrane-less, direct electron transfer based enzymatic fuel cell in human sweat and saliva. The enzymatic fuel cell was fabricated following our previous reports on miniature biofuel cells, utilizing gold nanoparticle modified gold microwires with immobilized cellobiose dehydrogenase and bilirubin oxidase. The following average characteristics of miniature glucose/oxygen biodevices operating in human sweat and saliva, respectively, were registered: 580 and 560 mV open-circuit voltage, 0.26 and 0.1 μW cm–2 power density at a cell voltage of 0.5 V, with up to ten times higher power output at 0.2 V. When saliva collected after meal ingestion was used, roughly a two-fold increase in power output was obtained, with a further two-fold increase by addition of 500 μM glucose. Likewise, the power generated in sweat at 0.5 V increased two-fold by addition of 500 μM glucose.

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  • 4.
    Gonzalez-Arribas, Elena
    et al.
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Pankratov, Dmitry
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). A.N. Bach Institute of Biochemistry, Moscow, 119071, Russian Federation; National Research Center “Kurchatov Institute”, Moscow, 123182, Russian Federation.
    Gounel, Sebastien
    CNRS, CRPP, UPR 8641, Pessac, 33600, France.
    Mano, Nicolas
    CNRS, CRPP, UPR 8641, Pessac, 33600, France.
    Blum, Zoltan
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). A.N. Bach Institute of Biochemistry, Moscow, 119071, Russian Federation; National Research Center “Kurchatov Institute”, Moscow, 123182, Russian Federation.
    Transparent and Capacitive Bioanode Based on Specifically Engineered Glucose Oxidase2016In: Electroanalysis, ISSN 1040-0397, E-ISSN 1521-4109, Vol. 28, no 6, p. 1290-1297Article in journal (Refereed)
    Abstract [en]

    Here the authors detail an optimized transparent capacitive glucose oxidizing bioanode, capable of supplying current densities of 10 μA cm-​2 at applied potentials of 0.1 V-​0.2 V vs. SCE, when continuously performing in a simple phosphate buffer, pH 7.4 and artificial human tears, both with a glucose concn. of 0.05 mM only. When operating in pulse mode, the bioanode was able to deliver current densities ≤21 μA cm-​2 at the beginning of the pulse with 571 μC cm-​2 total charges stored. The biogenic part of the enzymic device was a recombinant glucose oxidase mutant from Penicillium amagasakiense with high catalytic efficiency towards glucose, up to 14.5x104 M-​1 s-​1. The nonbiogenic part of the anodic system was based on a poly(3,​4-​ethylenedioxythiophene)​-​graphene nanocomposite, as a highly capacitive component with a capacitance d. in the 1 mF cm-​2 range, multi-​walled carbon nanotubes, as an addnl. nanostructuring element, and a conductive org. complex, as an electron shuttle between the redox enzyme and the electrode surface. The bioanode could potentially serve as a prototype of a double-​function enzymic anode for hybrid elec. power biodevices, energizing smart contact lenses.

  • 5. Otrokhov, Grigory
    et al.
    Pankratov, Dmitry
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Shumakovich, Galina
    Khlupova, Maria
    Zeifman, Yulia
    Vasil'eva, Irina
    Morozova, Olga
    Yaropolov, Alexander
    Enzymatic synthesis of polyaniline/multi-walled carbon nanotube composite with core shell structure and its electrochemical characterization for supercapacitor application2014In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 123, p. 151-157Article in journal (Refereed)
    Abstract [en]

    A new method involving laccase-mediator system has been developed for environmentally friendly synthesis of polyaniline/multi-walled carbon nanotubes (PANI/MWCNT) composite. Fungal laccase, potassium octocyanomolibdate (4+) and atmospheric oxygen served as catalyst, redox-mediator and terminal oxidant, respectively. The structure, morphology and electrical conductivity of composites with different PANI content were investigated. The energy storage of enzymatically obtained composite consists of an electrical double layer capacitance as well as pseudocapacitance of conducting polymer. The obtained PANI/MWCNT composite with PANI content ca. 49 wt.% had high specific capacitance and cycle stability during doping/dedoping. The specific capacitance of this composite measured by cyclic voltammetry technique with potential scan rate of 5 mV/s was ca. 440 F/g. The specific capacitance of the composite decreased by less than 7% of its maximum value after 1000 scan cycles between -0.1 and 0.7 V. Supercapacitor (SC) shell was made from flexible adhesive tape (regular Scotch tape) and current collector was formed after its separation from the surface of graphite foil. The ethanol dispersion of PANI/MWCNT composite was deposited on the current collector surface. The gel polymer electrolyte (polyvinyl alcohol in 1 M phosphoric acid) was employed as both electrolyte medium and separator. The energy and power densities under an operating window of 0.7 V were ca. 7.03 Wh/kg and 5.2 kW/kg, respectively. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.

  • 6.
    Pankratov, Dmitry
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Self-charging biosupercapacitors2016Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The thesis is focused on an entirely new class of electric power biodevices –self-charging biosupercapacitors, or in other words, charge-storing biofuelcells. The power generating segments of these biodevices rely on differentredox enzymes electrically wired to electrode surfaces. Planar electrodes wereadditionally nanostructured by gold nanoparticles to increase the real surfacearea/enhance enzyme loading. Bilirubin oxidase was used as a cathodicbiocatalyst responsible for oxygen electroreduction, whereas cellobiosedehydrogenase and glucose dehydrogenase were exploited as anodicbioelements catalyzing electrooxidation of glucose. The charge-storingsegments of biosupercapacitors were based on different electroconductingpolymers, including carbon nanotube based nanocomposites, and osmiummodified redox hydrogels. The particular bioelectrodes were characterized indetail using scanning electron and atomic force microscopies, as well asvarious electrochemical techniques. Self-charging biosupercapacitors wereassembled and basic parameters of the biodevices, viz. open-circuit voltages,power and charge densities, and stability, were studied in continuous andpulse operating modes.

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  • 7.
    Pankratov, Dmitry
    et al.
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Blum, Zoltan
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Hybrid electric power biodevices2014In: ChemElectroChem, E-ISSN 2196-0216, Vol. 1, no 11, p. 1798-1807Article in journal (Refereed)
    Abstract [en]

    Hybrid electric power biodevices, a new type of electric power-producing device, are a combination of an electrochemical capacitor and a biofuel cell. In this Minireview, we summarise existing knowledge on double-function bioelectrodes, that is, single electrodes concurrently manifesting bio-electrocatalytic and charge-storage features, and describe important historical aspects and achievements in this area. We also discuss a recently proposed method for concomitant electric power generation and storage, which is exemplified by fabricated and characterised self-charging bio-supercapacitors, also termed charge-storing biofuel cells. The electric power in these hybrid devices is uninterruptedly generated by direct transformation of chemical energy into electric energy, as occurs in biofuel cells. The power is simultaneously and directly stored within a single device, relying on different types of capacitance based on reversible charge-transfer reactions (pseudocapacitance) and/or electric double-layer capacitance, as in electrochemical capacitors. We also present some unpublished results on both dual-feature electrodes and hybrid biodevices and briefly highlight the prospects for their application.

  • 8.
    Pankratov, Dmitry
    et al.
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Blum, Zoltan
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Suyatin, Dmitry
    Popov, Vladimir
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Self-charging electrochemical biocapacitor2014In: ChemElectroChem, E-ISSN 2196-0216, Vol. 1, no 2, p. 343-346Article in journal (Refereed)
    Abstract [en]

    Two-in-one: A biological supercapacitor—a combination of an electrochemical capacitor and an enzymatic fuel cell—is presented. Both the capacitor and the biofuel cell are built from nanomaterials, namely, polyaniline/carbon nanotube composites and redox enzyme/gold nanoparticle assemblies. The biosupercapacitor is self-charging, membrane- and mediator-less

  • 9.
    Pankratov, Dmitry
    et al.
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Kurchatov's Complex of NBICS-technologies, National Research Center "Kurchatov Institute", Akademika Kurchatova Sq. 1, 123 182, Moscow, Russia.
    Conzuelo, Felipe
    Analytical Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, Universitätsstrasse 150, 44780, Bochum, Germany.
    Pinyou, Piyanut
    Analytical Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, Universitätsstrasse 150, 44780, Bochum, Germany.
    Alsaoub, Sabine
    Analytical Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, Universitätsstrasse 150, 44780, Bochum, Germany.
    Schuhmann, Wolfgang
    Analytical Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, Universitätsstrasse 150, 44780, Bochum, Germany.
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Kurchatov's Complex of NBICS-technologies, National Research Center "Kurchatov Institute", Akademika Kurchatova Sq. 1, 123 182, Moscow, Russia.
    A Nernstian Biosupercapacitor2016In: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 55, no 49, p. 15434-15438Article in journal (Refereed)
    Abstract [en]

    We propose the very first "Nernstian biosupercapacitor", a biodevice based on only one redox polymer: poly(vinyl imidazole-​co-​allylamine)​[Os(bpy)​2Cl]​, and two biocatalysts. At the bioanode PQQ-​dependent glucose dehydrogenase reduces the Os3+ moieties at the polymer to Os2+ shifting the Nernst potential of the Os3+/Os2+ redox couple to neg. values. Concomitantly, at the biocathode the redn. of O2 by means of bilirubin oxidase embedded in the same redox polymer leads to the oxidn. of Os2+ to Os3+ shifting the Nernst potential to higher values. Despite the use of just one redox polymer an open circuit voltage of more than 0.45 V was obtained during charging and the charge is stored in the redox polymer at both the bioanode and the biocathode. By connecting both electrodes via a predefined resistor a high power d. is obtained for a short time exceeding the steady state power of a corresponding biofuel cell by a factor of 8.

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  • 10.
    Pankratov, Dmitry
    et al.
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Falkman, Peter
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Blum, Zoltan
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    A hybrid electric power device for simultaneous generation and storage of electric energy2014In: Energy and Environmental Science, Vol. 7, no 3, p. 989-993Article in journal (Refereed)
    Abstract [en]

    We herein report on an entirely new kind of electric power device. In the hybrid device, chemical energy is directly converted into electric energy, which is capacitively stored within a singular contrivance. The device is built based on dual-function electrodes, viz. discrete electrodes manifesting simultaneous electrocatalytic and charge-storage features.

  • 11.
    Pankratov, Dmitry
    et al.
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). A.N. Bach Institute of Biochemistry, Moscow, 119071, Russian Federation; National Research Center “Kurchatov Institute”, Moscow, 123182, Russian Federation.
    Gonzalez-Arribas, Elena
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Blum, Zoltan
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). A.N. Bach Institute of Biochemistry, Moscow, 119071, Russian Federation; National Research Center “Kurchatov Institute”, Moscow, 123182, Russian Federation.
    Tear Based Bioelectronics2016In: Electroanalysis, ISSN 1040-0397, E-ISSN 1521-4109, Vol. 28, no 6, p. 1250-1266Article, review/survey (Refereed)
    Abstract [en]

    A review. This work provides an overview of the recent advances in the field of tear-​based wearable electrochem. biodevices, including non-​invasive biosensors, biol. fuel cells and biosupercapacitors. Contact lenses are attractive platforms for fabricating non-​invasive self-​contained gadgets for different applications, starting from devices with casual or mundane purposes only, like personalized smart lenses with direct (invisible for others) displays, and ending with biomedical devices for continuous fitness status and​/or health care monitoring. Key requirements and challenges that confront researchers in this exciting area are discussed.

  • 12.
    Pankratov, Dmitry
    et al.
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö högskola, Biofilms Research Center for Biointerfaces.
    González Arribas, Elena
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö högskola, Biofilms Research Center for Biointerfaces.
    Parunova, Yulia M.
    Gorbacheva, Marina A.
    Zeyfman, Yulia S.
    Kuznetsov, Sergey V.
    Lipkin, Aleksey
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö högskola, Biofilms Research Center for Biointerfaces.
    New nanobiocomposite materials for bioelectronic devices2015In: Acta Naturae, ISSN 2075-8251, Vol. 7, no 1, p. 98-101Article in journal (Refereed)
    Abstract [en]

    We have developed and synthesized nanobiocomposite materials based on graphene, poly(3,4-ethylenedioxythiophene), and glucose oxidase immobilized on the surface of various nanomaterials (gold nanoparticles and multi-walled carbon nanotubes) of different sizes (carbon nanotubes of different diameters). Comparative studies of the possible influence of the nanomaterial’s nature on the bioelectrocatalytic characteristics of glucose-oxidizing bioanodes in a neutral phosphate buffer solution demonstrated that the bioelectrocatalytic current densities of nanocomposite-based bioanodes are only weakly dependent on the size of the nanomaterial and are primarily defined by its nature. The developed nanobiocomposites are promising materials for new bioelectronic devices due to the ease in adjusting their capacitive and bioelectrocatalytic characteristics, which allows one to use them for the production of dual-function electrodes: i.e., electrodes which are capable of generating and storing electric power simultaneously.

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  • 13.
    Pankratov, Dmitry
    et al.
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Engineering Enzymology, A.N. Bach Institute of Biochemistry, Moscow, 119 071, Russian Federation; Kurchatov NBICS Centre, National Research Centre Kurchatov Institute, Moscow, 123182, Russian Federation.
    Ohlsson, Lars
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Gudmundsson, Petri
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Halak, Sanela
    Medical Imaging and Physiology, Skåne University Hospital, Malmö, 205 06, Sweden.
    Ljunggren, Lennart
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Blum, Zoltan
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Engineering Enzymology, A.N. Bach Institute of Biochemistry, Moscow, 119 071, Russian Federation; Kurchatov NBICS Centre, National Research Centre Kurchatov Institute, Moscow, 123182, Russian Federation.
    Ex vivo electric power generation in human blood using an enzymatic fuel cell in a vein replica2016In: RSC Advances, E-ISSN 2046-2069, Vol. 6, no 74, p. 70215-70220Article in journal (Refereed)
    Abstract [en]

    Here we report an enzymic fuel cell in a vein replica that generates sustained electricity, enough to power an e-​ink display, in an authentic human blood stream. We also detail a simple and safe approach for fuel cell evaluation under homeostatic conditions. Our results demonstrate proof-​of-​principle operation of a biocompatible and safe biodevice that could be implanted in superficial human veins, which we anticipate to be a starting point for more sophisticated investigations of personal sources of electricity.

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  • 14.
    Pankratov, Dmitry
    et al.
    Department of Chemistry, Technical University of Denmark, Kongens Lyngby, DK-2800, Denmark.
    Pankratova, Galina
    Department of Biochemistry and Structural Biology, Lund University, P.O. Box 124, Lund, SE-22100, Sweden.
    Dyachkova, Tatiana
    Tambov State Technical University, Sovetskaya Street, 106, Tambov, 392000, Russian Federation.
    Falkman, Peter
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Åkerlund, Hans-Erik
    Department of Biochemistry and Structural Biology, Lund University, P.O. Box 124, Lund, SE-22100, Sweden.
    Toscano, Miguel
    Novozymes A/S, Krogshøjvej 36, Bagsværd, 2880, Denmark.
    Qijin, Chi
    Department of Chemistry, Technical University of Denmark, Kongens Lyngby, DK-2800, Denmark.
    Gorton, Lo
    Department of Biochemistry and Structural Biology, Lund University, P.O. Box 124, Lund, SE-22100, Sweden.
    Supercapacitive Biosolar Cell Driven by Direct Electron Transfer between Photosynthetic Membranes and CNT Networks with Enhanced Performance2017In: ACS Energy Letters, E-ISSN 2380-8195, Vol. 2, no 11, p. 2635-2639Article in journal (Refereed)
    Abstract [en]

    Integrating photosynthetic cell components with nanostructured materials can facilitate the conversion of solar energy into electric power for creating sustainable carbon-neutral energy sources. With the aim at exploring efficient photoinduced biocatalytic energy conversion systems, we have used an amidated carbon nanotube (aCNT) networked matrix to integrate thylakoid membranes (TMs) for construction of a direct electron transfer-driven biosolar cell. We have evaluated the resulting photobioelectrochemical cells systematically. Compared to the carboxylated CNT (cCNT)-TMs system, the aCNT-TMs system enabled a 1.5-fold enhancement in photocurrent density. This system offers more advantages including a reduced charge-transfer resistance, a lower open-circuit potential, and an improved cell stability. More remarkably, the average power density of the optimized cells was 250 times higher than that of reported analogue systems. Our results suggest the significance of physical and electronic interactions between the photosynthetic components and the support nanomaterials and may offer new clues for designing improved biosolar cells.

  • 15.
    Pankratov, Dmitry
    et al.
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Sotres, Javier
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Barrantes, Alejandro
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Arnebrant, Thomas
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Interfacial behavior and activity of laccase and bilirubin oxidase on bare gold surfaces2014In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 30, no 10, p. 2943-2951Article in journal (Refereed)
    Abstract [en]

    Two blue multicopper oxidases (MCOs) (viz. Trametes hirsuta laccase (ThLc) and Myrothecium verrucaria bilirubin oxidase (MvBOx)) were immobilized on bare polycrystalline gold (Au) surfaces by direct adsorption from both dilute and concentrated enzyme solutions. The adsorption was studied in situ by means of null ellipsometry. Moreover, both enzyme-modified and bare Au electrodes were investigated in detail by atomic force microscopy (AFM) as well as electrochemically. When adsorbed from dilute solutions (0.125 and 0.25 mg mL–1 in the cases of ThLc and MvBOx, respectively), the amounts of enzyme per unit area were determined to be ca. 1.7 and 4.8 pmol cm–2, whereas the protein film thicknesses were determined to be 29 and 30 Å for ThLc and MvBOx, respectively. A well-pronounced bioelectrocatalytic reduction of molecular oxygen (O2) was observed on MvBOx/Au biocathodes, whereas this was not the case for ThLc-modified Au electrodes (i.e., adsorbed ThLc was catalytically inactive). The initially observed apparent kcatapp values for adsorbed MvBOx and the enzyme in solution were found to be very close to each other (viz. 54 and 58 s–1, respectively (pH 7.4, 25 °C)). However, after 3 h of operation of MvBOx/Au biocathodes, kcatapp dropped to 23 s–1. On the basis of the experimental results, conformational changes of the enzymes (in all likelihood, their flattening on the Au surface) were suggested to explain the deactivation of MCOs on the bare Au electrodes.

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  • 16.
    Pankratov, Dmitry
    et al.
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö högskola, Biofilms Research Center for Biointerfaces.
    Sundberg, Richard
    Sotres, Javier
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö högskola, Biofilms Research Center for Biointerfaces.
    Maximov, Ivan
    Graczyk, Mariusz
    Suyatin, Dmitry B.
    Gonzalez-Arribas, Elena
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö högskola, Biofilms Research Center for Biointerfaces.
    Lipkin, Aleksey
    Montelius, Lars
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö högskola, Biofilms Research Center for Biointerfaces.
    Transparent and flexible, nanostructured and mediatorless glucose/oxygen enzymatic fuel cells2015In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 294, p. 501-506Article in journal (Refereed)
    Abstract [en]

    Here we detail transparent, flexible, nanostructured, membrane-less and mediator-free glucose/oxygen enzymatic fuel cells, which can be reproducibly fabricated with industrial scale throughput. The electrodes were built on a biocompatible flexible polymer, while nanoimprint lithography was used for their nanostructuring. The electrodes were covered with gold, their surfaces were visualised using scanning electron and atomic force microscopies, and they were also studied spectrophotometrically and electrochemically. The enzymatic fuel cells were fabricated following our previous reports on membrane-less and mediator-free biodevices in which cellobiose dehydrogenase and bilirubin oxidase were used as anodic and cathodic biocatalysts, respectively. The following average characteristics of transparent and flexible biodevices operating in glucose and chloride containing neutral buffers were registered: 0.63 V open-circuit voltage, and 0.6 mW cm-2 maximal power density at a cell voltage of 0.35 V. A transparent and flexible enzymatic fuel cell could still deliver at least 0.5 mW cm-2 after 12 h of continuous operation. Thus, such biodevices can potentially be used as self-powered biosensors or electric power sources for smart electronic contact lenses.

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  • 17.
    Pankratov, Dmitry
    et al.
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö högskola, Biofilms Research Center for Biointerfaces.
    Sundberg, Richard
    Sotres, Javier
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö högskola, Biofilms Research Center for Biointerfaces.
    Suyatin, Dmitry B.
    Maximov, Ivan
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö högskola, Biofilms Research Center for Biointerfaces.
    Montelius, Lars
    Scalable, high performance, enzymatic cathodes based on nanoimprint lithography2015In: Beilstein Journal of Nanotechnology, ISSN 2190-4286, Vol. 6, p. 1377-1384Article in journal (Refereed)
    Abstract [en]

    Here we detail high performance, enzymatic electrodes for oxygen bio-electroreduction, which can be easily and reproducibly fabricated with industry-scale throughput. Planar and nanostructured electrodes were built on biocompatible, flexible polymer sheets, while nanoimprint lithography was used for electrode nanostructuring. To the best of our knowledge, this is one of the first reports concerning the usage of nanoimprint lithography for amperometric bioelectronic devices. The enzyme (Myrothecium verrucaria bilirubin oxidase) was immobilised on planar (control) and artificially nanostructured, gold electrodes by direct physical adsorption. The detailed electrochemical investigation of bioelectrodes was performed and the following parameters were obtained: open circuit voltage of approximately 0.75 V, and maximum bio-electrocatalytic current densities of 18 µA/cm2 and 58 µA/cm2 in air- saturated buffers versus 48 µA/cm2 and 186 µA/cm2 in oxygen-saturated buffers for planar and nanostructured electrodes, respect- ively. The half-deactivation times of planar and nanostructured biocathodes were measured to be 2 h and 14 h, respectively. The comparison of standard heterogeneous and bio-electrocatalytic rate constants showed that the improved bio-electrocatalytic performance of the nanostructured biocathodes compared to planar biodevices is due to the increased surface area of the nanostructured electrodes, whereas their improved operational stability is attributed to stabilisation of the enzyme inside nanocavities.

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  • 18.
    Pankratov, Dmitry
    et al.
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Sundberg, Richard
    Suyatin, Dmitry B.
    Sotres, Javier
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Barrantes, Alejandro
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Ruzgas, Tautgirdas
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Maximov, Ivan
    Montelius, Lars
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    The influence of nanoparticles on enzymatic bioelectrocatalysis2014In: RSC Advances, E-ISSN 2046-2069, Vol. 4, no 72, p. 38164-38168Article in journal (Refereed)
    Abstract [en]

    In nearly all papers concerning enzyme–nanoparticle based bioelectronic devices, it is stated that the presence of nanoparticles on electrode surfaces per se enhances bioelectrocatalysis, although the reasons for that enhancement are often unclear. Here, we report detailed experimental evidence that neither an overpotential of bioelectrocatalysis, nor direct electron transfer and bioelectrocatalytic reaction rates for an adsorbed enzyme depend on the size of nanoparticles within the range of 20–80 nm, i.e. for nanoparticles that are considerably larger than the enzyme molecules.

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  • 19.
    Pankratov, Dmitry
    et al.
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Zeifman, Yulia
    Morozova, Olga
    Shumakovich, Galina
    Vasil'eva, Irina
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Popov, Vladimir
    Yaropolov, Alexander
    A comparative study of biocathodes based on multiwall carbon nanotube buckypapers modified with three different multicopper oxidases2013In: Electroanalysis, ISSN 1040-0397, E-ISSN 1521-4109, Vol. 25, no 5, p. 1143-1149Article in journal (Refereed)
    Abstract [en]

    14 Single- and multi-​walled carbon nanotubes from different sources were characterized in detail, and the characteristics obtained were carefully analyzed. The carbon material with the highest capacitance, and also other superior properties ("Taunit-​M" from "NanoTechCenter", Russia)​, was chosen for further modification and fabrication of buckypaper based electrodes. These electrodes were biomodified with plant and fungal laccases, as well as fungal bilirubin oxidase. The designed biocathodes were studied in simple buffers and also in a complex physiol. fluid (human serum)​. Biocathodes based on immobilized fungal laccase were bioelectrocatalytically inactive in chloride contg. media at neutral pH. In spite of the quite high current densities realized using biodevices based on plant laccase and fungal bilirubin oxidase, the limited thermal stability of the enzymes renders the biocathodes inadequate for practical applications in implanted situations.

  • 20.
    Pankratov, Dmitry
    et al.
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Zeifman, Yulia S.
    Dudareva, Alexandra V.
    Pankratova, Galina K.
    Khlupova, Maria E.
    Parunova, Yulia M.
    Zajtsev, Dmitry N.
    Bashirova, Nina F.
    Popov, Vladimir O.
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Impact of surface modification with gold nanoparticles on the bioelectrocatalytic parameters of immobilized bilirubin oxidase2014In: Acta Naturae, ISSN 2075-8251, Vol. 6, no 1, p. 102-106Article in journal (Refereed)
    Abstract [en]

    We unveil experimental evidence that put into question the widely held notion concerning the impact of nanoparticles on the bioelectrocatalytic parameters of enzymatic electrodes. Comparative studies of the bioelectrocatalytic properties of fungal bilirubin oxidase from Myrothecium verrucaria adsorbed on gold electrodes, modified with gold nanoparticles of different diameters, clearly indicate that neither the direct electron transfer rate (standard heterogeneous electron transfer rate constants were calculated to be 31±9 s-1) nor the biocatalytic activity of the adsorbed enzyme (bioelectrocatalytic constants were calculated to be 34±11 s-1) depends on the size of the nanoparticles, which had diameters close to or larger than those of the enzyme molecules.

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  • 21.
    Pankratova, Galina
    et al.
    Department of Biochemistry and Structural Biology, Lund University, P.O. Box 124, Lund, SE-22100, Sweden.
    Pankratov, Dmitry
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö högskola, Biofilms Research Center for Biointerfaces. Kurchatov NBICS Centre, National Research Centre Kurchatov Institute, Moscow, 123182, Russian Federation.
    Hasan, Kamrul
    Department of Biochemistry and Structural Biology, Lund University, P.O. Box 124, Lund, SE-22100, Sweden.
    Åkerlund, Hans-Erik
    Department of Biochemistry and Structural Biology, Lund University, P.O. Box 124, Lund, SE-22100, Sweden.
    Albertsson, Per-Åke
    Department of Biochemistry and Structural Biology, Lund University, P.O. Box 124, Lund, SE-22100, Sweden.
    Leech, Dónal
    School of Chemistry and Ryan Institute, National University of Ireland Galway, University Road, Galway, Ireland.
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö högskola, Biofilms Research Center for Biointerfaces. Kurchatov NBICS Centre, National Research Centre Kurchatov Institute, Moscow, 123182, Russian Federation.
    Gorton, Lo
    Department of Biochemistry and Structural Biology, Lund University, P.O. Box 124, Lund, SE-22100, Sweden.
    Supercapacitive Photo-Bioanodes and Biosolar Cells: A Novel Approach for Solar Energy Harnessing2017In: Advanced Energy Materials, ISSN 1614-6832, E-ISSN 1614-6840, Vol. 7, no 12Article in journal (Refereed)
    Abstract [en]

    The concept of supercapacitive photo-bioanode and biosolar cell (photo-biosupercapacitor) for simultaneous solar energy conversion and storage is demonstrated for the first time. Exploiting the capacitive component significantly improves the electron transfer processes and allows the achievement of a current density of 280 µA cm−2 in the pulse mode.

  • 22.
    Parunova, Yulia
    et al.
    National Research Institute “Kurchatov Institute,”, Moscow, 123182, Russia.
    Bushnev, Sergey
    National Research Institute “Kurchatov Institute,”, Moscow, 123182, Russia.
    Gonzalez-Arribas, Elena
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö högskola, Biofilms Research Center for Biointerfaces.
    Falkman, Peter
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö högskola, Biofilms Research Center for Biointerfaces.
    Lipkin, Aleksey
    National Research Institute “Kurchatov Institute,”, Moscow, 123182, Russia.
    Popov, Vladimir
    National Research Institute “Kurchatov Institute,”, Moscow, 123182, Russia.
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö högskola, Biofilms Research Center for Biointerfaces. National Research Institute “Kurchatov Institute,”, Moscow, 123182, Russia.
    Pankratov, Dmitry
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö högskola, Biofilms Research Center for Biointerfaces. National Research Institute “Kurchatov Institute,”, Moscow, 123182, Russia.
    Potentially implantable biocathode with the function of charge accumulation based on nanocomposite of polyaniline​/carbon nanotubes2016In: Russian journal of electrochemistry, ISSN 1023-1935, E-ISSN 1608-3342, Vol. 52, no 12, p. 1166-1171Article in journal (Refereed)
    Abstract [en]

    A potentially implantable biocathode with the function of charge accumulation based on a nanobiocomposite including multiwall carbon nanotubes, polyaniline, and bilirubin oxidase is developed. The regularities of the functioning of the obtained electrode are studied in air-​satd. phosphate buffer soln., pH 7.4 (PB)​, and also in phosphate buffer soln. contg. redox-​active blood components (BMB)​. The open circuit potential of the biocathode is 0.33 and 0.08 V vs. the SCE in PB and BMB, resp.; it is completely restored after at least three self-​charge​/discharge cycles with connection to resistors with different resistance. Bioelectrocatalytic c.d. of oxygen redn. is 0.50 and 0.42 mA cm-​2 with the residual activity of 78 and 60​% of the initial value after 12 h of continuous operation in PB at 25°C and in BMB at 37°C, resp.

  • 23.
    Shleev, Sergey
    et al.
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Kurchatov NBICS Centre, National Research Centre “Kurchatov Institute”, Moscow, 123182, Russian Federation.
    Andoralov, Viktor
    KEMET Electronics AB, Skiftesvägen 16, Gränna, 563 31, Sweden.
    Pankratov, Dmitry
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Kurchatov NBICS Centre, National Research Centre “Kurchatov Institute”, Moscow, 123182, Russian Federation.
    Falk, Magnus
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). NanoFlex Limited, iTac, Daresbury Laboratory, Sci-Tech Daresbury, Keckwick Lane, Daresbury, WA4 4AD, United Kingdom.
    Aleksejeva, Olga
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Blum, Zoltan
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Oxygen Electroreduction Versus Bioelectroreduction: Direct Electron Transfer Approach2016In: Electroanalysis, ISSN 1040-0397, E-ISSN 1521-4109, Vol. 28, no 10, p. 2270-2287Article, review/survey (Refereed)
    Abstract [en]

    A review. Being inspired by a very recent review entitled: "Electrocatalysis and bioelectrocatalysis - Distinction without a difference" and following the general approach employed by Prof. Dr. Schuhmann, in the current work we point to the similarities and differences between oxygen electroredn. and bioelectroredn. processes. To addnl. distinguish our paper from the recent review we touch on different bioelements, such as redox proteins and living cells, but we still keep a special emphasis on oxidoreductases, biocatalysts par excellence. Moreover, we also exclusively focus on oxygen electroredn. based on direct electron transfer reactions. On the one hand, we corroborate the previously made conclusion regarding intrinsically high activity of the active sites of biol. catalysts, esp. redox enzymes, which results in mass transfer and heterogeneous electron transfer limited currents from oxygen reducing bioelectrodes. On the other hand, we disagree with the statements regarding the exceptionality of precious metal catalysts, and the notion of a huge trade-​off between high activity and stability of non-​precious metal catalysts and bioelements. We show that the activity and stability of noble metal based cathodes is very far from perfect, esp. when these electrodes operate in complex electrolytes, such as physiol. fluids, e.g. human blood.

  • 24. Zeng, Ting
    et al.
    Pankratov, Dmitry
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Falk, Magnus
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Leimkühler, Silke
    Shleev, Sergey
    Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV).
    Wollenberger, Ulla
    Miniature direct electron transfer based sulphite/oxygen enzymatic fuel cells2015In: Biosensors & bioelectronics, ISSN 0956-5663, E-ISSN 1873-4235, Vol. 66, p. 39-42Article in journal (Refereed)
    Abstract [en]

    A direct electron transfer (DET) based sulphite/oxygen biofuel cell is reported that utilises human sulphite oxidase (hSOx) and Myrothecium verrucaria bilirubin oxidase (MvBOx) and nanostructured gold electrodes. For bioanode construction, the nanostructured gold microelectrodes were further modified with 3,3′-dithiodipropionic acid di(N-hydroxysuccinimide ester) to which polyethylene imine was covalently attached. hSOx was adsorbed onto this chemically modified nanostructured electrode with high surface loading of electroactive enzyme and in presence of sulphite high anodic bioelectrocatalytic currents were generated with an onset potential of 0.05 V vs. NHE. The biocathode contained MvBOx directly adsorbed to the deposited gold nanoparticles for cathodic oxygen reduction starting at 0.71 V vs. NHE. Both enzyme electrodes were integrated to a DET-type biofuel cell. Power densities of 8 and 1 μW cm−2 were achieved at 0.15 V and 0.45 V of cell voltages, respectively, with the membrane based biodevices under aerobic conditions.

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