Journal
TALANTA
Volume 75, Issue 3, Pages 786-791Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2007.12.015
Keywords
enzyme sensor; gas-phase; gas sensor; amperometric biosensor; dye-linked formaldehyde dehydrogenase; Hyphomicrobium zavarzinii
Categories
Ask authors/readers for more resources
An amperometric enzyme-based sensor-system for the direct detection of formaldehyde in air is under investigation. The, biosensor is based on a native bacterial NAD(+)- and glutathione-independent formaldehyde dehydrogenase as biorecognition element. The enzyme was isolated from Hyphomicrobium zavarzinii strain ZV 580, grown on methylamine hydrochloride in a fed-batch process. The sensor depends on the enzymatic conversion of the analyte to formic acid. Released electrons are detected in an amperometric measurement at 0.2 V vs. Ag/AgCl reference electrode by means of a redox-mediator. To optimize the sensing device, Ca2+ and pyrroloquinoline quinone (PQQ) were added to the buffer solution as reconstitutional substances. At this stage. the sensor shows linear response in the tested ppm-range with a sensitivity of 0.39 mu A/ppm. The signal is highly reproducible with respect to sensitivity and base line signal. Reproducibility of sensitivity is more than 90% within the same bacterial batch and even when enzyme of different bacterial batches is used. (C) 2007 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available