Abstract
Novel and selective microbial amperometric biosensors that use Gluconobacter oxydans cells to monitor the bacterial bioconversion of glycerol (Gly) to 1,3-propanediol (1,3-PD) are described. Two different mediators, ferricyanide and flexible polyvinylimidazole osmium functionalized polymer (Os-polymer), were employed to prepare two different microbial biosensors, both of which gave high detection performance. The good operational stabilities of both types of biosensor were underlined by the ability to detect 1,3-PD throughout 140 h of continuous operation. Both microbial biosensor systems showed excellent selectivity for 1,3-PD in the presence of a high excess of glycerol [selectivity ratios (1,3-PD/Gly) of 118 or 245 for the ferricyanide and Os-polymer systems, respectively]. Further, the robustness of each microbial biosensor was highlighted by the high reliability of 1,3-PD detection achieved (average RSD of standards <2%, and well below 4% for samples). The biosensor implementing the Os-polymer mediator exhibited high selectivity towards 1,3-PD detection and allowed moderate sample throughput (up to 12 h−1) when integrated into a flow system. This system was used to monitor the concentration of 1,3-PD during a real bioprocess. Results from biosensor assays of 1,3-PD in bioprocess samples taken throughout the fermentation were in a very good agreement with results obtained from reference HPLC assays (R 2 = 0.999).
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Acknowledgements
This work was supported by the European Commission, under the scope of the BIODIOL project. The BIODIOL project (QLK5-CT-2002-01343) is funded by the European Commission within the 5th Framework Program. The integrated bioprocess development and economical evaluation of BIODIOL also includes a partner’s work, which is not presented here. The EU is not responsible for the content of this publication. This work was also supported by a grant from the Slovak Grant Agency for Science VEGA under the Projects No. 1/1196/04, 1/4299/07 and 1/4452/07.
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Katrlík, J., Voštiar, I., Šefčovičová, J. et al. A novel microbial biosensor based on cells of Gluconobacter oxydans for the selective determination of 1,3-propanediol in the presence of glycerol and its application to bioprocess monitoring. Anal Bioanal Chem 388, 287–295 (2007). https://doi.org/10.1007/s00216-007-1211-5
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DOI: https://doi.org/10.1007/s00216-007-1211-5