Assaying CO2 release for determination of formate dehydrogenase activity in entrapment matrices and aqueous-organic two-phase systems |
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| Authors: | Ansorge-Schumacher Marion B Steinsiek Sonja Eberhard Werner Keramidas Nikolaos Erkens Klaus Hartmeier Winfried Büchs Jochen |
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| Institution: | Department of Biotechnology, RWTH Aachen University, D-52056 Aachen, Germany. m.ansorge@biotec.rwth-aachen.de |
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| Abstract: | Formate dehydrogenase is an important enzyme for NADH-regeneration in enzyme-catalysed reductions. Methods to determine the activity of this biocatalyst during reaction in aqueous-organic two-phase systems or after immobilisation were therefore investigated. Determination of gaseous CO2 in the headspace of reaction vessels either by gas chromatography or by pressure sensors was found to be a suitable way for deduction of FDH-activity in either of these reaction systems. In the presence of organic solvents, gas chromatography yielded more precise data than pressure sensors, while pressure measurements offer the opportunity to assay continuously the activity of entrapped FDH throughout the whole course of reaction. |
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| Keywords: | formate dehydrogenase two‐phase system entrapment activity assay CO2 |
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