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  • 1. Afshar, Majid Ghahraman
    et al.
    Crespo, Gaston A.
    Dorokhin, Denis
    Neel, Bastien
    Bakker, Eric
    Thin Layer Coulometry of Nitrite with Ion-Selective Membranes2015Ingår i: Electroanalysis, ISSN 1040-0397, E-ISSN 1521-4109, Vol. 27, nr 3, s. 609-615Artikel i tidskrift (Refereegranskat)
  • 2. Crespo, Gaston A.
    et al.
    Mistlberger, Guenter
    Bakker, Eric
    Towards Ion-Selective Membranes with Electrogenerated Chemiluminescence Detection: Visualizing Selective Ru(bpy)(3)(2+) Transport Across a Plasticized Poly(vinyl chloride) Membrane2012Ingår i: Electroanalysis, ISSN 1040-0397, E-ISSN 1521-4109, Vol. 24, nr 1, s. 61-68Artikel i tidskrift (Refereegranskat)
  • 3.
    Cuartero, Maria
    et al.
    Univ Geneva, Dept Inorgan & Analyt Chem, Quai Ernest Ansermet 30, CH-1211 Geneva, Switzerland..
    Acres, Robert G.
    ANSTO, Australian Synchrotron, 800 Blackburn Rd, Clayton, Vic 3168, Australia..
    Jarolimova, Zdenka
    Univ Geneva, Dept Inorgan & Analyt Chem, Quai Ernest Ansermet 30, CH-1211 Geneva, Switzerland..
    Bakker, Eric
    Univ Geneva, Dept Inorgan & Analyt Chem, Quai Ernest Ansermet 30, CH-1211 Geneva, Switzerland..
    Crespo, Gaston A.
    KTH, Skolan för kemivetenskap (CHE), Kemi, Tillämpad fysikalisk kemi. Univ Geneva, Dept Inorgan & Analyt Chem, Quai Ernest Ansermet 30, CH-1211 Geneva, Switzerland.
    De Marco, Roland
    Univ Sunshine Coast, Fac Sci Hlth Educ & Engn, 90 Sippy Downs Dr, Sippy Downs, Qld 4556, Australia.;Univ Queensland, Sch Chem & Mol Biosci, Brisbane, Qld 4072, Australia.;Curtin Univ, Dept Chem, GPO Box U1987, Perth, WA 6109, Australia..
    Electron Hopping between Fe 3d States in Ethynylferrocene-doped Poly(Methyl Methacrylate)-poly(Decyl Methacrylate) Copolymer Membranes2018Ingår i: Electroanalysis, ISSN 1040-0397, E-ISSN 1521-4109, Vol. 30, nr 4, s. 596-601Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Synchrotron radiation-valence band spectroscopy (SR-VBS) has been utilized in a study of redox molecule valence states implicated in the electron hopping mechanism of ethynylferrocene in unplasticized poly(methyl methacrylate)-poly(decyl methacrylate) [PMMA-PDMA] membranes. In this communication, it is revealed that, at high concentrations of ethynylferrocene, there are observable Fe 3d valence states that are likely linked to electron hopping between ferrocene moieties of neighbouring redox molecules. Furthermore, electrochemically induced stratification of ethynylferrocene in an oxidized PMMA-PDMA membrane produces a gradient of Fe 3d states toward the buried interface at the glassy carbon/PMMA-PDMA membrane enabling electron hopping and electrochemical reactivity of dissolved ethynylferrocene across this buried film.

  • 4. Neel, Bastien
    et al.
    Asfhar, Majid Ghahraman
    Crespo, Gaston A.
    Pawlak, Marcin
    Dorokhin, Denis
    Bakker, Eric
    Nitrite-Selective Electrode Based On Cobalt( II) tert-ButylSalophen Ionophore2014Ingår i: Electroanalysis, ISSN 1040-0397, E-ISSN 1521-4109, Vol. 26, nr 3, s. 473-480Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A series of polymeric nitrite-selective electrodes containing a new lipophilic ionophore Co(II) tert-butyl-salophen is reported. The stability of Co(II) ionophores within a PVC-based membrane was investigated by leaching experiments. Different membrane compositions were explored in order to reach the lowest possible limit of detection for a PVC-based nitrite selective polymeric membrane electrode containing this ionophore. The optimal electrode showed a limit of detection of 2x10(-6)M and exhibited four orders of magnitude of discrimination over nitrate, chloride and bromide. The electrodes were evaluated in undiluted human urine and attest to the robustness of the ionophore.

  • 5. Pawlak, M.
    et al.
    Grygolowicz-Pawlak, E.
    Crespo, Gaston A.
    Mistlberger, G.
    Bakker, E.
    PVC-Based Ion-Selective Electrodes with Enhanced Biocompatibility by Surface Modification with "Click" Chemistry2013Ingår i: Electroanalysis, ISSN 1040-0397, E-ISSN 1521-4109, Vol. 25, nr 8, s. 1840-1846Artikel i tidskrift (Refereegranskat)
  • 6. Soleimani, Majid
    et al.
    Afshar, Majid Ghahraman
    Shafaat, Atefeh
    Crespo, Gaston A.
    High-Selective Tramadol Sensor Based on Modified Molecularly Imprinted Polymer-Carbon Paste Electrode with Multiwalled Carbon Nanotubes2013Ingår i: Electroanalysis, ISSN 1040-0397, E-ISSN 1521-4109, Vol. 25, nr 5, s. 1159-1168Artikel i tidskrift (Refereegranskat)
  • 7.
    Spadiut, Oliver
    et al.
    KTH, Skolan för bioteknologi (BIO), Glykovetenskap.
    Brugger, Dagmar
    Coman, Vasile
    Haltrich, Dietmar
    Gorton, Lo
    Engineered Pyranose 2-Oxidase: Efficiently Turning Sugars into Electrical Energy2010Ingår i: Electroanalysis, ISSN 1040-0397, E-ISSN 1521-4109, Vol. 22, nr 7-8, s. 813-820Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Due to the recent interest in enzymatic biofuel cells (BECs), sugar oxidizing enzymes other than the commonly used glucose oxidase are gaining more importance as possible bioelements of implantable microscale-devices, which can, for example, be used in biosensors and pacemakers. In this study we used rational and semi-rational protein design to improve the catalytic activity of the enzyme pyranose 2-oxidase (P2Ox) with its alternative soluble electron acceptors 1,4-benzoquinone and ferricenium ion, which can serve as electron mediators, to possibly boost the power output of enzymatic BECs. Using a screening assay based on 96-well plates, we identified the variant H450G, which showed lower K-M and higher k(cat) values for both 1,4-benzoquinone and ferricenium ion compared to the wild-type enzyme, when either D-glucose or D-galactose were used as saturating electron donors. Besides this variant, we analyzed the variants V546C and T169G/V546C for their possible application in enzymatic BECs. The results obtained in homogeneous solution were compared with those obtained when P2Ox was immobilized on the surface of graphite electrodes and either "wired" to an osmium redox polymer or using soluble 1,4-benzoquinone as mediator. According to the spectrophotometrically determined kinetic constants, the possible energy output, measured in flow injection analysis experiments with these variants, increased up to 4-fold compared to systems employing the wild-type enzyme. Our results show that by increasing the catalytic activity of the redox enzyme P2Ox with its alternative electron acceptors 1,4-benzoquinone and ferricenium ion, it is possible to achieve a higher energy output of an enzymatic BFC when using the same concentration of sugar substrate.

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