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  • 1.
    Cagnini, A
    et al.
    UNIV FLORENCE,DIPARTIMENTO SANITA PUBBL EPIDEMIOL and CHIM ANALIT,I-50121 FLORENCE,ITALY; CRANFIELD UNIV,CRANFIELD BIOTECHNOL CTR,CRANFIELD MK43 0AL,BEDS,ENGLAND; .
    Palchetti, I
    UNIV FLORENCE,DIPARTIMENTO SANITA PUBBL EPIDEMIOL and CHIM ANALIT,I-50121 FLORENCE,ITALY; CRANFIELD UNIV,CRANFIELD BIOTECHNOL CTR,CRANFIELD MK43 0AL,BEDS,ENGLAND; .
    Mascini, M
    UNIV FLORENCE,DIPARTIMENTO SANITA PUBBL EPIDEMIOL and CHIM ANALIT,I-50121 FLORENCE,ITALY; CRANFIELD UNIV,CRANFIELD BIOTECHNOL CTR,CRANFIELD MK43 0AL,BEDS,ENGLAND; .
    Turner, APF
    Cranfield University, UK.
    Ruthenized screen-printed choline oxidase-based biosensors for measurement of anticholinesterase activity1995In: Mikrochimica Acta, ISSN 0026-3672, E-ISSN 1436-5073, Vol. 121, no 04-jan, 155-166 p.Article in journal (Refereed)
    Abstract [en]

    Plastic disposable choline biosensors based on ruthenized-carbon screen-printed electrodes were prepared and their use for monitoring organophosphorus pesticides and carbamates is described. The presence of 0.5% ruthenium on activated carbon mixed to form a simple graphite-based ink for the working electrode surface increased the sensitivity towards hydrogen peroxide. The choline biosensor is based on such an electrode coupled with choline oxidase immobilized by adsorption and was used to detect the inhibition effect of carbamates and organophosphorus pesticides on acetylcholinesterase. With the optimized procedure described (pH, buffer composition, incubation time, substrate concentration), concentrations of pesticides (Carbofuran) as low as 1 nM could be detected.

  • 2.
    Palchetti, I
    et al.
    University Florence, Dipartimento Sanita Pubbl Epidemiol and Chim Anal A, I-50121 Florence, Italy; Cranfield University, Cranfield Biotechnol Centre, Cranfield MK43 0AL, Beds, England; .
    Cagnini, A
    University Florence, Dipartimento Sanita Pubbl Epidemiol and Chim Anal A, I-50121 Florence, Italy; Cranfield University, Cranfield Biotechnol Centre, Cranfield MK43 0AL, Beds, England; .
    Mascini, M
    University Florence, Dipartimento Sanita Pubbl Epidemiol and Chim Anal A, I-50121 Florence, Italy; Cranfield University, Cranfield Biotechnol Centre, Cranfield MK43 0AL, Beds, England; .
    Turner, APF
    Cranfield University, UK.
    Characterisation of screen-printed electrodes for detection of heavy metals1999In: Mikrochimica Acta, ISSN 0026-3672, E-ISSN 1436-5073, Vol. 131, no 02-jan, 65-73 p.Article in journal (Refereed)
    Abstract [en]

    The characterisation of disposable screen-printed electrodes for stripping analysis is described. The graphite surface of the working electrode is used as substrate for plating a thin mercury film, which allows the electrochemical preconcentration of heavy metals. Optimisation procedures and experimental results are presented. Detection limits around the ppb level were obtained for different metals [Pb(II), Cd(II), Cu(II)].

  • 3.
    Schaferling, M.
    et al.
    Schäferling, M., Thermo Hybaid GmbH, Sedanstraße 10, 89077 Ulm, Germany, Institute of Analytical Chemistry, University of Regensburg, 93040 Regensburg, Germany.
    Riepl, M.
    Pavlickova, P.
    Thermo Hybaid GmbH, Sedanstraße 10, 89077 Ulm, Germany.
    Paul, H.
    Thermo Hybaid GmbH, Sedanstraße 10, 89077 Ulm, Germany.
    Kambhampati, D.
    Thermo Hybaid GmbH, Sedanstraße 10, 89077 Ulm, Germany.
    Liedberg, Bo
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Sensor Science and Molecular Physics .
    Functionalized Self-Assembled Monolayers on Gold as Binding Matrices for the Screening of Antibody-Antigen Interactions2003In: Mikrochimica Acta, ISSN 0026-3672, E-ISSN 1436-5073, Vol. 142, no 4, 193-203 p.Article in journal (Refereed)
    Abstract [en]

    Two different types of w-substituted alkanethiol/disulfide compounds have been used to prepare monolayer architectures on gold serving as platforms for the immobilization of receptor probe molecules - antibodies. These are: (i) carboxylic acid alkanethiols post-reacted with amino biotin to generate streptavidin surfaces, and (ii) N-hydroxysuccinimide-terminated disulfide surfaces. The properties of the monolayers, with and without attached receptor probe molecules, were analysed using infrared spectroscopy, ellipsometry, fluorescence scanning and atomic force microscopy. Several experimental parameters, such as condensation reagents, additives, probe and target concentrations and immobilization time, were systematically varied to determine the dynamic range and to optimize the sensitivity and signal-to-noise ratio of the biochip platforms. Fluorescence screening using Cy5-labelled antigens finally demonstrated that both surfaces could be successfully employed to immobilize the antibodies. The pros and cons of the two approaches are also discussed.

  • 4.
    Zhou, Ye
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Sensor Science and Molecular Physics .
    Andersson, Olof
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Sensor Science and Molecular Physics .
    Lindberg, P.
    Biacore AB, Rapsgatan 7, S-754 50 Uppsala, Sweden.
    Liedberg, Bo
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Sensor Science and Molecular Physics .
    Reversible hydrophobic barriers introduced by microcontact printing: Application to protein microarrays2004In: Mikrochimica Acta, ISSN 0026-3672, E-ISSN 1436-5073, Vol. 146, no 3-4, 193-205 p.Article in journal (Refereed)
    Abstract [en]

    Microcontact printing (µCP) has been used to introduce temporary hydrophobic barriers on carboxymethylated dextran (CMD) hydrogels on gold. Among the investigated types of inks, tetraoctadecylammonium bromide (TOAB), electrostatically bound to the CMD layer, provided the most well-defined features both with respect to pattern-definition and reversibility upon exposure to a regeneration solution. The printed patterns were characterized by atomic force microscopy (AFM), scanning electron microscopy (SEM), microscopic wetting and imaging null ellipsometry to explore the influence of concentration of ink solution and contact time on the appearance of the printed layer. AFM revealed that the printed TOAB molecules aggregated into clusters rather than into a homogeneous mono- or multilayer on the CMD hydrogel. It was also observed that printed areas of TOAB that are larger than 25?µm are inhomogeneous most likely because of an edge transfer lithography (ETL) mechanism. A protein model system based on Protein A-rabbit antimouse Fc ? was used to evaluate the potential of the patterned surface as a protein microarray chip by means of surface plasmon microscopy (SPM). Moreover, non-specific adsorption of several proteins onto TOAB barriers was also studied using surface plasmon resonance (SPR), and it is evident that undesired adsorption can be eliminated by removing barriers after ligand immobilization, but prior to analyte exposure, by treating the patterned surface with a simple salt regeneration solution. © Springer-Verlag/Wien 2004.

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