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  • 1.
    Sandström, K. J. Mattias
    et al.
    Umeå universitet, Medicinska fakulteten, Institutionen för folkhälsa och klinisk medicin, Yrkesmedicin. Cranfield Biotechnology Centre, Cranfield University, UK; Department of Chemistry, National Institute for Working Life, Umeå, Sweden.
    Newman, Jeffrey
    Cranfield Biotechnology Centre, Cranfield University, UK.
    Sunesson, Anna-Lena
    Department of Chemistry, National Institute for Working Life, Umeå, Sweden.
    Levin, Jan-Olof
    Umeå universitet, Medicinska fakulteten, Institutionen för folkhälsa och klinisk medicin, Yrkesmedicin. Department of Chemistry, National Institute for Working Life, Umeå, Sweden.
    Turner, Anthony P. F.
    Cranfield Biotechnology Centre, Cranfield University, UK.
    Amperometric biosensor for formic acid in air2000Ingår i: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 70, nr 1–3, s. 182-187Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The possibility of developing a simple, inexpensive and specific personal passive “real-time” air sampler incorporating a biosensor for formic acid was investigated. The sensor is based on the enzymatic reaction between formic acid and formate dehydrogenase (FDH) with nicotinamide adenine dinucleotide (NAD+) as a co-factor and Meldola's blue as mediator. An effective way to immobilise the enzyme, co-factor and Meldola's blue on screen-printed, disposable, electrodes was found to be in a mixture of glycerol and phosphate buffer covered with a gas-permeable membrane. Steady-state current was reached after 4–15 min and the limit of detection was calculated to be below 1 mg/m3. However, the response decreased by 50% after storage at −15°C for 1 day.

  • 2.
    Sandström, K. J. Mattias
    et al.
    National Institute for Working Life, Umeå, Sweden.
    Sunesson, Anna-Lena
    National Institute for Working Life, Umeå, Sweden.
    Levin, Jan-Olof
    National Institute for Working Life, Umeå, Sweden.
    Turner, Anthony P. F.
    Cranfield Biotechnology Centre, Cranfield University, UK.
    A gas-phase biosensor for environmental monitoring of formic acid: laboratory and field validation2003Ingår i: Journal of Environmental Monitoring, ISSN 1464-0325, E-ISSN 1464-0333, Vol. 5, nr 3, s. 477-482Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In order to encourage more exposure measurements to be performed, a formic acid gas-phase biosensor has been developed for this purpose. In the present paper, an enzyme based biosensor has been validated with respect to analyte selectivity and on-site use. To ensure that the sampler developed measures the compound of interest the biosensor was exposed to three near structural homologues to formic acid, i.e. acetic acid, methanol and formaldehyde. These vapours were generated with and without formic acid and the only compound that was found to have an effect on the performance of the biosensor, albeit a small one, was acetic acid. The field test was performed in a factory using formic acid-containing glue for glulam products. In parallel to the measurements with the biosensor a well defined reference method was used for sampling and analysing formic acid. It was found that the biosensor worked satisfactorily in this environment when used in a stationary position. It was also shown that the biosensor could determine formic acid vapour concentrations down to 0.03 mg m−3.

  • 3.
    Sandström, K. J. Mattias
    et al.
    Umeå universitet, Medicinska fakulteten, Institutionen för folkhälsa och klinisk medicin, Yrkesmedicin. National Institute for Working Life, Department of Chemistry, Umeå, Sweden; Cranfield Biotechnology Centre, Cranfield University, Cranfield, Bedford, UK.
    Turner, Anthony P. F.
    Cranfield Biotechnology Centre, Cranfield University, Cranfield, Bedford, UK.
    Biosensors in air monitoring1999Ingår i: Journal of Environmental Monitoring, ISSN 1464-0325, E-ISSN 1464-0333, Vol. 1, nr 4, s. 293-298Artikel, forskningsöversikt (Refereegranskat)
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