Optical biosensor optimized for continuous in-line glucose monitoring in animal cell culture
Biosensors for continuous glucose monitoring in bioreactors could provide a valuable tool for optimizing culture conditions in biotechnological applications. We have developed an optical biosensor for long-term continuous glucose monitoring and demonstrated a tight glucose level control during cell...
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| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
20 July 2017
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| In: |
Analytical and bioanalytical chemistry
Year: 2017, Volume: 409, Issue: 24, Pages: 5711-5721 |
| ISSN: | 1618-2650 |
| DOI: | 10.1007/s00216-017-0511-7 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1007/s00216-017-0511-7 Verlag, Volltext: https://doi.org/10.1007/s00216-017-0511-7 
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| Author Notes: | Mircea Tric, Mario Lederle, Lisa Neuner, Igor Dolgowjasow, Philipp Wiedemann, Stefan Wölfl, Tobias Werner |
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| 520 | |a Biosensors for continuous glucose monitoring in bioreactors could provide a valuable tool for optimizing culture conditions in biotechnological applications. We have developed an optical biosensor for long-term continuous glucose monitoring and demonstrated a tight glucose level control during cell culture in disposable bioreactors. The in-line sensor is based on a commercially available oxygen sensor that is coated with cross-linked glucose oxidase (GOD). The dynamic range of the sensor was tuned by a hydrophilic perforated diffusion membrane with an optimized permeability for glucose and oxygen. The biosensor was thoroughly characterized by experimental data and numerical simulations, which enabled insights into the internal concentration profile of the deactivating by-product hydrogen peroxide. The simulations were carried out with a one-dimensional biosensor model and revealed that, in addition to the internal hydrogen peroxide concentration, the turnover rate of the enzyme GOD plays a crucial role for biosensor stability. In the light of this finding, the glucose sensor was optimized to reach a long functional stability (>52 days) under continuous glucose monitoring conditions with a dynamic range of 0-20 mM and a response time of t 90 ≤ 10 min. In addition, we demonstrated that the sensor was sterilizable with beta and UV irradiation and only subjected to minor cross sensitivity to oxygen, when an oxygen reference sensor was applied. Open image in new window Graphical abstract Measuring setup of a glucose biosensor in a shake flask for continuous glucose monitoring in mammalian cell culture | ||
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