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d-Lactate electrochemical biosensor prepared by immobilization of thermostable dye-linked d-lactate dehydrogenase from Candidatus Caldiarchaeum subterraneum.
Journal of Bioscience and Bioengineering 2018 October
A stable d-lactate electrochemical sensing system was developed using a dye-linked d-lactate dehydrogenase (Dye-DLDH) from an uncultivated thermophilic archaeon, Candidatus Caldiarchaeum subterraneum. To develop the system, the putative gene encoding the Dye-DLDH from Ca. Caldiarchaeum subterraneum was overexpressed in Escherichia coli, and the expressed product was purified. The recombinant enzyme was a highly thermostable Dye-DLDH that retained full activity after incubation for 10 min at 70°C. The electrode for detection of d-lactate was prepared by immobilizing the thermostable Dye-DLDH and multi-walled carbon nanotube (MWCNT) within Nafion membrane. The electrocatalytic response of the electrode was clearly observed upon exposure to d-lactate. The electrode response to d-lactate was linear within the concentration range of 0.03-2.5 mM, and it showed little reduction in responsiveness after 50 days. This is the first report describing a d-lactate sensing system using a thermostable Dye-DLDH.
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