1
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Miebach K, Finger M, Büchs J. Parallelized Online Measurement of Hydrogen for Time‐Efficient Characterization of Microbial Hydrogen Producers. CHEM-ING-TECH 2022. [DOI: 10.1002/cite.202255071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- K. Miebach
- RWTH Aachen University Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
| | - M. Finger
- RWTH Aachen University Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
| | - J. Büchs
- RWTH Aachen University Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
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2
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Forsten E, Kauffmann K, Schiwy A, Hollert H, Büchs J. P12-48 Streamlining the Ames mutagenicity test by online monitoring of the oxygen transfer rate in 96-well microplate scale. Toxicol Lett 2022. [DOI: 10.1016/j.toxlet.2022.07.527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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3
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Keitel L, Finger M, Büchs J. Small‐scale anaerobic process development: Carbon dioxide and trace oxygen concentrations impact growth and product formation of Bacteroidetes strains. CHEM-ING-TECH 2022. [DOI: 10.1002/cite.202255063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- L. Keitel
- RWTH Aachen University Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
| | - M. Finger
- RWTH Aachen University Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
| | - J. Büchs
- RWTH Aachen University Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
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4
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Stachurski S, Salgado-Lugo H, Peña Malacara C, Büchs J. Tailor‐made alginate? Investigations of biotechnological alginate production with
Azotobacter vinelandii. CHEM-ING-TECH 2020. [DOI: 10.1002/cite.202055198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- S. Stachurski
- RWTH Aachen University AVT-Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
| | - H. Salgado-Lugo
- UNAM Instituto de Biotecnología Avenida Universidad 2001 62210 Cuernavaca Mexico
| | - C. F. Peña Malacara
- UNAM Instituto de Biotecnología Avenida Universidad 2001 62210 Cuernavaca Mexico
| | - J. Büchs
- RWTH Aachen University AVT-Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
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5
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Berg C, Ihling N, Büchs J. Combination of multivariate data analysis and 2D fluorescence spectroscopy in high‐throughput cultivation experiments. CHEM-ING-TECH 2020. [DOI: 10.1002/cite.202055200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- C. Berg
- RWTH AVT/Bioverfahrenstechnik Forckenbeckstr. 51 52074 Aachen Germany
| | - N. Ihling
- RWTH AVT/Bioverfahrenstechnik Forckenbeckstr. 51 52074 Aachen Germany
| | - J. Büchs
- RWTH AVT/Bioverfahrenstechnik Forckenbeckstr. 51 52074 Aachen Germany
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6
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Geinitz B, Rehmann L, Büchs J, Regestein L. Determination of the individual biomass concentrations in a defined mixed culture – A non‐invasive tool for optical online monitoring. CHEM-ING-TECH 2020. [DOI: 10.1002/cite.202055231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- B. Geinitz
- RWTH Aachen University AVT-Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
| | - L. Rehmann
- The University of Western Ontario Department of Chemical and Biochemical Engineering N6A 5B9 London Canada
| | - J. Büchs
- RWTH Aachen University AVT-Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
| | - L. Regestein
- RWTH Aachen University AVT-Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
- Leibniz Institute for Natural Product Research and Infection Biology – Hans Knöll Institute Adolf-Reichwein-Str. 23 07745 Jena Germany
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7
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Hüser A, Mann M, Büchs J. Advances in small‐scale process development for fermentative CO
2
utilization. CHEM-ING-TECH 2020. [DOI: 10.1002/cite.202055225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- A. Hüser
- RWTH Aachen University AVT – Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
| | - M. Mann
- RWTH Aachen University AVT – Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
| | - J. Büchs
- RWTH Aachen University AVT – Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
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8
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Pastoors J, Biselli A, Jupke A, Deischter J, Palkovits R, Moritz I, Rose M, Büchs J. Interaction of microorganisms and adsorbents – A protocol for the investigation of biocompatibility. CHEM-ING-TECH 2020. [DOI: 10.1002/cite.202055057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- J. Pastoors
- RWTH Aachen University AVT-Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
| | - A. Biselli
- RWTH Aachen University AVT-Fluid Process Engineering Forckenbeckstr. 51 52074 Aachen Germany
| | - A. Jupke
- RWTH Aachen University AVT-Fluid Process Engineering Forckenbeckstr. 51 52074 Aachen Germany
| | - J. Deischter
- RWTH Aachen University Institute of Technical and Macromolecular Chemistry Worringerweg 2 52074 Aachen Germany
| | - R. Palkovits
- RWTH Aachen University Institute of Technical and Macromolecular Chemistry Worringerweg 2 52074 Aachen Germany
| | - I. Moritz
- Technical University of Darmstadt Department of Technical Chemistry II Alarich-Weiss-Str. 8 64206 Darmstadt Germany
| | - M. Rose
- Technical University of Darmstadt Department of Technical Chemistry II Alarich-Weiss-Str. 8 64206 Darmstadt Germany
| | - J. Büchs
- RWTH Aachen University AVT-Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
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Vonester D, Otten J, Pohl M, Wiechert W, Büchs J. XyloSenS – FRET‐basierte Biosensoren zur online In‐vitro‐ Überwachung der Substratkonzentration von Kultivierungen. CHEM-ING-TECH 2020. [DOI: 10.1002/cite.202055219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- D. Vonester
- RWTH Aachen University AVT – Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Deutschland
| | - J. Otten
- Forschungszentrum Jülich GmbH IBG-1: Biotechnology 52425 Jülich Deutschland
| | - M. Pohl
- Forschungszentrum Jülich GmbH IBG-1: Biotechnology 52425 Jülich Deutschland
| | - W. Wiechert
- Forschungszentrum Jülich GmbH IBG-1: Biotechnology 52425 Jülich Deutschland
| | - J. Büchs
- RWTH Aachen University AVT – Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Deutschland
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10
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Wollborn D, Germer A, Hußmann F, Blank L, Büchs J. Adjusting primary screening conditions to obtain reproducible performance of
Pichia pastoris
clones at different cultivation scales. CHEM-ING-TECH 2020. [DOI: 10.1002/cite.202055107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- D. Wollborn
- RWTH Aachen University AVT-Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
| | - A. Germer
- RWTH Aachen University Institute of Applied Microbiology Worringer Weg 1 52074 Aachen Germany
| | - F. K. Hußmann
- RWTH Aachen University AVT-Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
| | - L. M. Blank
- RWTH Aachen University Institute of Applied Microbiology Worringer Weg 1 52074 Aachen Germany
| | - J. Büchs
- RWTH Aachen University AVT-Biochemical Engineering Forckenbeckstr. 51 52074 Aachen Germany
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11
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Dinger R, Lattermann C, Flitsch D, Büchs J. The µRAMOS: A tool for high‐throughput online monitoring of respiration activities in 96‐deepwell microtiter plates. CHEM-ING-TECH 2020. [DOI: 10.1002/cite.202055214] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- R. Dinger
- RWTH Aachen University Chair of Biochemical Engineering (AVT. BioVT) Forckenbeckstr. 51 52074 Aachen Germany
| | - C. Lattermann
- Kuhner Shaker GmbH Kaiserstr. 100 52134 Herzogenrath Germany
| | - D. Flitsch
- PyroScience GmbH Hubertusstr. 35 52064 Aachen Germany
| | - J. Büchs
- RWTH Aachen University Chair of Biochemical Engineering (AVT. BioVT) Forckenbeckstr. 51 52074 Aachen Germany
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12
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Keil T, Dittrich B, Rührer J, Morschett H, Lattermann C, Möller M, Büchs J. Polymer-based ammonium-limited fed-batch cultivation in shake flasks improves lipid productivity of the microalga Chlorella vulgaris. Bioresour Technol 2019; 291:121821. [PMID: 31352167 DOI: 10.1016/j.biortech.2019.121821] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Revised: 07/12/2019] [Accepted: 07/15/2019] [Indexed: 06/10/2023]
Abstract
The aim of this work was to study ammonium-limited fed-batch conditions in heterotrophic C. vulgaris shake flask cultivations. Therefore, an innovative polymer-based ammonium release technique (polymer beads) was developed. Using these beads in shake flasks, C. vulgaris cultivations resulted in simultaneous growth and lipid accumulation. Lipid productivity was increased by 43% compared to batch cultivations. Furthermore, by online monitoring of the metabolic activity (RAMOS technique), unlimited growth and depletion of nutrients could be identified. A previously unknown sulfur limitation was detected in the applied Bold's Basal Medium. Combining the ammonium release beads with the RAMOS technique proved to be an efficient method for microalgae process development.
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Affiliation(s)
- T Keil
- AVT - Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074 Aachen, Germany
| | - B Dittrich
- DWI - Leibniz Institute for Interactive Materials, RWTH Aachen University Forckenbeckstraße 50, 52074 Aachen, Germany
| | - J Rührer
- AVT - Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074 Aachen, Germany
| | - H Morschett
- Institute of Bio- and Geosciences: IBG-1: Biotechnology, Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, 52428 Jülich, Germany
| | - C Lattermann
- Kuhner Shaker GmbH, Kaiserstraße 100, 52134 Herzogenrath, Germany
| | - M Möller
- DWI - Leibniz Institute for Interactive Materials, RWTH Aachen University Forckenbeckstraße 50, 52074 Aachen, Germany; Textile and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 1, 52074 Aachen, Germany
| | - J Büchs
- AVT - Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074 Aachen, Germany.
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13
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Keil T, Dittrich B, Lattermann C, Habicher T, Büchs J. Polymer-based controlled-release fed-batch microtiter plate - diminishing the gap between early process development and production conditions. J Biol Eng 2019; 13:18. [PMID: 30833982 PMCID: PMC6387502 DOI: 10.1186/s13036-019-0147-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 02/11/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Fed-batch conditions are advantageous for industrial cultivations as they avoid unfavorable phenomena appearing in batch cultivations. Those are for example the formation of overflow metabolites, catabolite repression, oxygen limitation or inhibition due to elevated osmotic concentrations. For both, the early bioprocess development and the optimization of existing bioprocesses, small-scale reaction vessels are applied to ensure high throughput, low costs and prompt results. However, most conventional small-scale procedures work in batch operation mode, which stands in contrast to fed-batch conditions in large-scale bioprocesses. Extensive expenditure for installations and operation accompany almost all cultivation systems in the market allowing fed-batch conditions in small-scale. An alternative, more cost efficient enzymatic glucose release system is strongly influenced by environmental conditions. To overcome these issues, this study investigates a polymer-based fed-batch system for controlled substrate release in microtiter plates. RESULTS Immobilizing a solid silicone matrix with embedded glucose crystals at the bottom of each well of a microtiter plate is a suitable technique for implementing fed-batch conditions in microtiter plates. The results showed that the glucose release rate depends on the osmotic concentration, the pH and the temperature of the medium. Moreover, the applied nitrogen source proved to influence the glucose release rate. A new developed mathematical tool predicts the glucose release for various media conditions. The two model organisms E. coli and H. polymorpha were cultivated in the fed-batch microtiter plate to investigate the general applicability for microbial systems. Online monitoring of the oxygen transfer rate and offline analysis of substrate, product, biomass and pH confirmed that fed-batch conditions are comparable to large-scale cultivations. Furthermore, due to fed-batch conditions in microtiter plates, product formation could be enhanced by the factor 245 compared to batch cultivations. CONCLUSIONS The polymer-based fed-batch microtiter plate represents a sophisticated and cost efficient system to mimic typical industrial fed-batch conditions in small-scale. Thus, a more reliable strain screening and early process development can be performed. A systematical scale-down with low expenditure of work, time and money is possible.
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Affiliation(s)
- T. Keil
- AVT - Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074 Aachen, Germany
| | - B. Dittrich
- DWI – Leibniz Institute for Interactive Materials, RWTH Aachen University, Forckenbeckstraße 50, 52074 Aachen, Germany
| | - C. Lattermann
- Kuhner Shaker GmbH, Kaiserstraße 100, 52134 Herzogenrath, Germany
| | - T. Habicher
- AVT - Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074 Aachen, Germany
| | - J. Büchs
- AVT - Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074 Aachen, Germany
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14
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Keil T, Dittrich B, Büchs J. Application of a fed-batch microtiter plate to overcome hurdles in the early steps of process development. CHEM-ING-TECH 2018. [DOI: 10.1002/cite.201855299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- T. Keil
- RWTH Aachen; Chair of Biochemical Engineering, Aachener Verfahrenstechnik; Forckenbeckstraße 51 52074 Aachen Germany
| | - B. Dittrich
- RWTH Aachen; Leibniz Institute for Interactive Materials; Forckenbeckstraße 50 52074 Aachen Germany
| | - J. Büchs
- RWTH Aachen; Chair of Biochemical Engineering, Aachener Verfahrenstechnik; Forckenbeckstraße 51 52074 Aachen Germany
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15
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Bongartz P, Sengpiel R, Schelden M, Wandrey G, Büchs J, Wessling M. Blasenfreie Membranbegasung zur Biotensidproduktion im NRW-Strategieprojekt BioSC Focus Lab Bio 2. CHEM-ING-TECH 2018. [DOI: 10.1002/cite.201855261] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- P. Bongartz
- Lehrstuhl für Chemische Verfahrenstechnik; Forckenbeckstraße 51 52074 Aachen Deutschland
| | - R. Sengpiel
- Lehrstuhl für Chemische Verfahrenstechnik; Forckenbeckstraße 51 52074 Aachen Deutschland
| | - M. Schelden
- Lehrstuhl für Bioverfahrenstechnik; Forckenbeckstraße 51 52074 Aachen Deutschland
| | - G. Wandrey
- Lehrstuhl für Bioverfahrenstechnik; Forckenbeckstraße 51 52074 Aachen Deutschland
| | - J. Büchs
- Lehrstuhl für Bioverfahrenstechnik; Forckenbeckstraße 51 52074 Aachen Deutschland
| | - M. Wessling
- Lehrstuhl für Chemische Verfahrenstechnik; Forckenbeckstraße 51 52074 Aachen Deutschland
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16
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Brehl C, Brass H, Pietruszka J, Büchs J. Optimized prodigiosin production with Pseudomonas putida
using parallelized non-invasive online measurements. CHEM-ING-TECH 2018. [DOI: 10.1002/cite.201855270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- C. Brehl
- RWTH Aachen University; Aachener Verfahrenstechnik - Biochemical Engineering; Forckenbeckstraße 51 52074 Aachen Germany
| | - H. Brass
- FZ Jülich; Institute of Bio- and Geosciences, IBG-1: Biotechnology; 52425 Jülich Germany
| | - J. Pietruszka
- FZ Jülich; Institute of Bio- and Geosciences, IBG-1: Biotechnology; 52425 Jülich Germany
| | - J. Büchs
- RWTH Aachen University; Aachener Verfahrenstechnik - Biochemical Engineering; Forckenbeckstraße 51 52074 Aachen Germany
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17
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Philip P, Kern D, Goldmanns J, Seiler F, Schulte A, Habicher T, Büchs J. Parallel substrate supply and pH stabilization for optimal screening of E. coli with the membrane-based fed-batch shake flask. Microb Cell Fact 2018; 17:69. [PMID: 29743073 PMCID: PMC5941677 DOI: 10.1186/s12934-018-0917-8] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2017] [Accepted: 05/03/2018] [Indexed: 11/16/2022] Open
Abstract
Background Screening in the fed-batch operation mode is essential for biological cultivations facing challenges as oxygen limitation, osmotic inhibition, catabolite repression, substrate inhibition or overflow metabolism. As a screening tool on shake flask level, the membrane-based fed-batch shake flask was developed. While a controlled supply of a substrate was realized with the in-built membrane tip, the possibilities for replenishing nutrients and stabilizing pH values was not yet exploited. High buffer concentrations were initially used, shifting the medium osmolality out of the biological optimum. As the growth rate is predefined by the glucose release kinetics from the reservoir, the resulting medium acidification can be compensated with a controlled continuous supply of an alkaline compound. The focus of this research is to establish a simultaneous multi-component release of glucose and an alkaline compound from the reservoir to enable cultivations within the optimal physiological range of Escherichia coli. Results In combination with the Respiratory Activity MOnitoring System, the membrane-based fed-batch shake flask enabled the detection of an ammonium limitation. The multi-component release of ammonium carbonate along with glucose from the reservoir resulted not only in the replenishment of the nitrogen source but also in the stabilization of the pH value in the culture medium. A biomass concentration up to 25 g/L was achieved, which is one of the highest values obtained so far to the best of the author’s knowledge with the utilization of a shake flask and a defined synthetic medium. Going a step further, the pH stabilization allowed the decrease of the required buffer amount to one-fourth establishing an optimal osmolality range for cultivation. As optimal physiological conditions were implemented with the multi-component release fed-batch cultivation, the supply of 0.2 g glucose in a 10 mL initial culture medium volume with 50 mM MOPS buffer resulted in a twofold higher biomass concentration than in a comparable batch cultivation. Conclusions The newly introduced multi-component release with the membrane-based fed-batch shake flask serves a threefold purpose of replenishing depleted substrates in the culture medium, stabilizing the pH throughout the entire cultivation time and minimizing the necessary amount of buffer to maintain an optimal osmolality range. In comparison to a batch cultivation, these settings enable to achieve higher biomass and product concentrations.![]() Electronic supplementary material The online version of this article (10.1186/s12934-018-0917-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- P Philip
- AVT-Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074, Aachen, Germany
| | - D Kern
- AVT-Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074, Aachen, Germany
| | - J Goldmanns
- AVT-Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074, Aachen, Germany
| | - F Seiler
- AVT-Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074, Aachen, Germany
| | - A Schulte
- AVT-Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074, Aachen, Germany
| | - T Habicher
- AVT-Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074, Aachen, Germany
| | - J Büchs
- AVT-Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074, Aachen, Germany.
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18
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Philip P, Meier K, Kern D, Goldmanns J, Stockmeier F, Bähr C, Büchs J. Systematic evaluation of characteristics of the membrane-based fed-batch shake flask. Microb Cell Fact 2017; 16:122. [PMID: 28716035 PMCID: PMC5514527 DOI: 10.1186/s12934-017-0741-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Accepted: 07/11/2017] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND The initial part of process development involves extensive screening programs to identify optimal biological systems and cultivation conditions. For a successful scale-up, the operation mode on screening and production scale must be as close as possible. To enable screening under fed-batch conditions, the membrane-based fed-batch shake flask was developed. It is a shake flask mounted with a central feed reservoir with an integrated rotating membrane tip for a controlled substrate release. Building on the previously provided proof of principle for this tool, this work extends its application by constructive modifications and improved methodology to ensure reproducible performance. RESULTS The previously limited operation window was expanded by a systematic analysis of reservoir set-up variations for cultivations with the fast-growing organism Escherichia coli. Modifying the initial glucose concentration in the reservoir as well as interchanging the built-in membrane, resulted in glucose release rates and oxygen transfer rate levels during the fed-batch phase varying up to a factor of five. The range of utilizable membranes was extended from dialysis membranes to porous microfiltration membranes with the design of an appropriate membrane tip. The alteration of the membrane area, molecular weight cut-off and liquid volume in the reservoir offered additional parameters to fine-tune the duration of the initial batch phase, the oxygen transfer rate level of the fed-batch phase and the duration of feeding. It was shown that a homogeneous composition of the reservoir without a concentration gradient is ensured up to an initial glucose concentration of 750 g/L. Finally, the experimental validity of fed-batch shake flask cultivations was verified with comparable results obtained in a parallel fed-batch cultivation in a laboratory-scale stirred tank reactor. CONCLUSIONS The membrane-based fed-batch shake flask is a reliable tool for small-scale screening under fed-batch conditions filling the gap between microtiter plates and scaled-down stirred tank reactors. The implemented reservoir system offers various set-up possibilities, which provide a wide range of process settings for diverse biological systems. As a screening tool, it accurately reflects the cultivation conditions in a fed-batch stirred tank reactor and enables a more efficient bioprocess development.
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Affiliation(s)
- P. Philip
- AVT-Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074 Aachen, Germany
| | - K. Meier
- AVT-Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074 Aachen, Germany
| | - D. Kern
- AVT-Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074 Aachen, Germany
| | - J. Goldmanns
- AVT-Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074 Aachen, Germany
| | - F. Stockmeier
- AVT-Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074 Aachen, Germany
| | - C. Bähr
- AVT-Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074 Aachen, Germany
| | - J. Büchs
- AVT-Biochemical Engineering, RWTH Aachen University, Forckenbeckstraße 51, 52074 Aachen, Germany
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Schelden M, Thies S, Schipper K, Jäger KE, Feldbrügge M, Büchs J. VariSurf - Produktion von Glykolipidvarianten für industrielle Anwendungen. CHEM-ING-TECH 2016. [DOI: 10.1002/cite.201650512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Eggert A, Maßmann T, Kreyenschulte D, Regestein L, Büchs J, Jupke A. Biotechnological Production of Itaconic Acid via In Situ Product Removal by Reactive Extraction, Back-extraction, and Crystallization. CHEM-ING-TECH 2016. [DOI: 10.1002/cite.201650530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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21
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Philip E, Büchs J. Innovative Membrane-Based Fed-Batch Shake Flask. CHEM-ING-TECH 2016. [DOI: 10.1002/cite.201650092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Flitsch D, Krabbe S, Schomburg W, Büchs J. Well-aufgelöste Messung der Sauerstofftransferrate in einer Standard 48-Well-Mikrotiter-Platte. CHEM-ING-TECH 2016. [DOI: 10.1002/cite.201650455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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23
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Schelden M, Lima W, Wunderlich M, Rehmann L, Büchs J, Regestein L. Online-Viskositätsmessung am Beispiel der Xanthan-Produktion mit Xanthomonas campestris. CHEM-ING-TECH 2016. [DOI: 10.1002/cite.201650515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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24
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Sieben M, Giese H, Grosch J, Kauffmann K, Büchs J. Evaporation-Dependent Temperature Phenomena in Microplates. CHEM-ING-TECH 2016. [DOI: 10.1002/cite.201650039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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25
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Wewetzer SJ, Kunze M, Ladner T, Luchterhand B, Roth S, Rahmen N, Kloß R, Costa e Silva A, Regestein L, Büchs J. Parallel use of shake flask and microtiter plate online measuring devices (RAMOS and BioLector) reduces the number of experiments in laboratory-scale stirred tank bioreactors. J Biol Eng 2015; 9:9. [PMID: 26265936 PMCID: PMC4531433 DOI: 10.1186/s13036-015-0005-0] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Accepted: 05/12/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Conventional experiments in small scale are often performed in a 'Black Box' fashion, analyzing only the product concentration in the final sample. Online monitoring of relevant process characteristics and parameters such as substrate limitation, product inhibition and oxygen supply is lacking. Therefore, fully equipped laboratory-scale stirred tank bioreactors are hitherto required for detailed studies of new microbial systems. However, they are too spacious, laborious and expensive to be operated in larger number in parallel. Thus, the aim of this study is to present a new experimental approach to obtain dense quantitative process information by parallel use of two small-scale culture systems with online monitoring capabilities: Respiration Activity MOnitoring System (RAMOS) and the BioLector device. RESULTS The same 'mastermix' (medium plus microorganisms) was distributed to the different small-scale culture systems: 1) RAMOS device; 2) 48-well microtiter plate for BioLector device; and 3) separate shake flasks or microtiter plates for offline sampling. By adjusting the same maximum oxygen transfer capacity (OTRmax), the results from the RAMOS and BioLector online monitoring systems supplemented each other very well for all studied microbial systems (E. coli, G. oxydans, K. lactis) and culture conditions (oxygen limitation, diauxic growth, auto-induction, buffer effects). CONCLUSIONS The parallel use of RAMOS and BioLector devices is a suitable and fast approach to gain comprehensive quantitative data about growth and production behavior of the evaluated microorganisms. These acquired data largely reduce the necessary number of experiments in laboratory-scale stirred tank bioreactors for basic process development. Thus, much more quantitative information is obtained in parallel in shorter time.
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Affiliation(s)
- S. J. Wewetzer
- />RWTH Aachen University, AVT - Biochemical Engineering, Worringer Weg 1, 52074 Aachen, Germany
| | - M. Kunze
- />RWTH Aachen University, AVT - Biochemical Engineering, Worringer Weg 1, 52074 Aachen, Germany
| | - T. Ladner
- />RWTH Aachen University, AVT - Biochemical Engineering, Worringer Weg 1, 52074 Aachen, Germany
| | - B. Luchterhand
- />RWTH Aachen University, AVT - Biochemical Engineering, Worringer Weg 1, 52074 Aachen, Germany
| | - S. Roth
- />RWTH Aachen University, AVT - Biochemical Engineering, Worringer Weg 1, 52074 Aachen, Germany
| | - N. Rahmen
- />RWTH Aachen University, AVT - Biochemical Engineering, Worringer Weg 1, 52074 Aachen, Germany
| | - R. Kloß
- />RWTH Aachen University, AVT - Biochemical Engineering, Worringer Weg 1, 52074 Aachen, Germany
| | - A. Costa e Silva
- />University of Minho, CEB - Centre of Biological Engineering, Campus de Gualtar, 4700-057 Braga, Portugal
| | - L. Regestein
- />RWTH Aachen University, AVT - Biochemical Engineering, Worringer Weg 1, 52074 Aachen, Germany
| | - J. Büchs
- />RWTH Aachen University, AVT - Biochemical Engineering, Worringer Weg 1, 52074 Aachen, Germany
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Kostner D, Luchterhand B, Junker A, Volland S, Daniel R, Büchs J, Liebl W, Ehrenreich A. The consequence of an additional NADH dehydrogenase paralog on the growth of Gluconobacter oxydans DSM3504. Appl Microbiol Biotechnol 2014; 99:375-86. [PMID: 25267158 DOI: 10.1007/s00253-014-6069-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 08/29/2014] [Accepted: 09/02/2014] [Indexed: 11/25/2022]
Abstract
Acetic acid bacteria such as Gluconobacter oxydans are used in several biotechnological processes due to their ability to perform rapid incomplete regio- and stereo-selective oxidations of a great variety of carbohydrates, alcohols, and related compounds by their membrane-bound dehydrogenases. In order to understand the growth physiology of industrial strains such as G. oxydans ATCC 621H that has high substrate oxidation rates but poor growth yields, we compared its genome sequence to the genome sequence of strain DSM 3504 that reaches an almost three times higher optical density. Although the genome sequences are very similar, DSM 3504 has additional copies of genes that are absent from ATCC 621H. Most importantly, strain DSM 3504 contains an additional type II NADH dehydrogenase (ndh) gene and an additional triosephosphate isomerase (tpi) gene. We deleted these additional paralogs from DSM 3504, overexpressed NADH dehydrogenase in ATCC 621H, and monitored biomass and the concentration of the representative cell components as well as O2 and CO2 transfer rates in growth experiments on mannitol. The data revealed a clear competition of membrane-bound dehydrogenases and NADH dehydrogenase for channeling electrons in the electron transport chain of Gluconobacter and an important role of the additional NADH dehydrogenase for increased growth yields. The less active the NADH dehydrogenase is, the more active is the membrane-bound polyol dehydrogenase. These results were confirmed by introducing additional ndh genes via plasmid pAJ78 in strain ATCC 621H, which leads to a marked increase of the growth rate.
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Affiliation(s)
- D Kostner
- Lehrstuhl für Mikrobiologie, Technische Universität München, Emil-Ramann Str. 4, 85354, Freising, Germany
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Büchs J, Wunderlich M, Lopes E, Regestein L. In-situ-Viskositätsmessung in Rührreaktoren. CHEM-ING-TECH 2014. [DOI: 10.1002/cite.201450637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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28
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Büchs J, Giese H, Azizan A. Challenges of Scaling-Up Viscous Fermentations from Shake Flasks to Stirred-Tank Fermentors. CHEM-ING-TECH 2014. [DOI: 10.1002/cite.201450631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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29
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Antonov E, Schlembach I, Herweg E, Regestein L, Büchs J, Agler-Rosenbaum M. Method Development for Cellulosic Mixed-Culture Fermentations. CHEM-ING-TECH 2014. [DOI: 10.1002/cite.201450145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Daub A, Böhm M, Delueg S, Mühlmann M, Schneider G, Büchs J. Maximum stable drop size measurements indicate turbulence attenuation by aeration in a 3m3 aerated stirred tank. Biochem Eng J 2014. [DOI: 10.1016/j.bej.2014.02.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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31
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Kunze M, Roth S, Bock S, Büchs J. Kombinierte Kultivierung in Kleinkultursystemen als Alternative zum Laborfermenter für die Bioprozessentwicklung. CHEM-ING-TECH 2012. [DOI: 10.1002/cite.201250346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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32
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Mehmood N, Olmos E, Goergen JL, Blanchard F, Ullisch D, Klöckner W, Büchs J, Delaunay S. Oxygen supply controls the onset of pristinamycins production by Streptomyces pristinaespiralis in shaking flasks. Biotechnol Bioeng 2011; 108:2151-61. [PMID: 21520016 DOI: 10.1002/bit.23177] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2011] [Revised: 03/22/2011] [Accepted: 04/12/2011] [Indexed: 11/12/2022]
Abstract
Antibiotics are secondary metabolites, generally produced during stationary phase of growth under different nutritional and hydrodynamic stresses. However, the exact mechanisms of the induction of antibiotics production are still not clearly established. In a previous study, the induction of pristinamycins production by Streptomyces pristinaespiralis as well as product concentrations were correlated with power dissipation per unit of volume (P/V) in shaking flasks. In this study, detailed kinetics of growth, substrate consumption, oxygen transfer rate and pristinamycins production under varying P/V conditions have been obtained and analyzed. Our results showed that higher P/V resulted in a higher concentration of biomass and promoted an earlier nutrient limitation and ultimately an earlier induction of pristinamycins production. The maximal specific growth rate, specific oxygen consumption rate and specific consumption rate of glutamate increased with P/V while influence was less marked with specific consumption rate of glucose, arginine, ammonium ions and phosphate. When oxygen uptake rate (OUR) was limited by free-surface oxygen transfer, pristinamycins production was not detected despite the occurrence of nitrogen and/or phosphate sources limitation. The threshold value for OUR observed was around 25 mmol L(-1) h(-1). This suggested that a limitation in nitrogen and/or phosphate alone was not sufficient to induce pristinamycins production by S. pristinaespiralis pr11. To induce this production, the oxygen transfer had to be non-limiting.
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Affiliation(s)
- N Mehmood
- Laboratoire Réactions et Génie des Procédés-UPR CNRS 3349, Nancy-Université, ENSAIA-INPL, 2 Avenue de la Forêt de Haye B.P. 172 F-54505 Vandœuvre lès Nancy, France
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Engel P, Seiferheld B, Jäger G, Büchs J, Spiess A. Einfluss von ionischer Flüssigkeit auf endo- und exo-Cellulasen zur Umsetzung nativer und modifizierter cellulolytischer Substrate. CHEM-ING-TECH 2010. [DOI: 10.1002/cite.201050308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Jäger G, Wulfhorst H, Zeithammel E, Ellinidou E, Büchs J, Spieß A. Charakterisierung und High-Throughput-Screening von Cellulasen mittels Streulicht. CHEM-ING-TECH 2010. [DOI: 10.1002/cite.201050029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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35
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Kamerke C, Spieß A, Fioroni M, Büchs J, Schwaneberg U, Elling L. Microwave-Assisted Biocatalysis Employing Glycosidases. CHEM-ING-TECH 2010. [DOI: 10.1002/cite.201050059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Wulfhorst H, Engel P, Ogolong A, Viell J, Büchs J, Spiess A. Substrateigenschaften und Enzymbeladung in der heterogenen Cellulosehydrolyse. CHEM-ING-TECH 2010. [DOI: 10.1002/cite.201050268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Bähr C, Thiele R, Böhm S, Büchs J. Autoclavable glass adhesion technique for biotechnology and medical devices. N Biotechnol 2009. [DOI: 10.1016/j.nbt.2009.06.142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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40
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Funke M, Büchs J, Buchenauer A, Mokwa W, Kensy F, Müller C. Microfluidic controlled fermentations in microtiter plates. N Biotechnol 2009. [DOI: 10.1016/j.nbt.2009.06.108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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41
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Wulfhorst H, Büchs J, Spieß A. Charakterisierung von Cellulasepräparationen mittels Streulicht. CHEM-ING-TECH 2009. [DOI: 10.1002/cite.200950287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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42
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Huber R, Ritter D, Hering T, Kensy F, Wang L, Büchs J. Optimierung der Proteinexpression im Hochdurchsatz. CHEM-ING-TECH 2009. [DOI: 10.1002/cite.200950023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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43
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Scheidle M, Dittrich B, Klinger J, Meißner L, Klee D, Büchs J. pH-Kontrolle in Schüttelkolben mithilfe neuartiger Controlled-Release-Systeme. CHEM-ING-TECH 2009. [DOI: 10.1002/cite.200950085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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44
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Bähr C, Thiele R, Böhm S, Dilger K, Büchs J. Autoklavierbare Glasklebtechnik für die Biotechnologie und Medizintechnik. CHEM-ING-TECH 2009. [DOI: 10.1002/cite.200950161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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45
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Daub A, Böhm M, Büchs J. Charakterisierung der hydromechanischen Belastung in begasten Rührreaktoren. CHEM-ING-TECH 2009. [DOI: 10.1002/cite.200950376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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46
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Funke M, Buchenauer A, Mokwa W, Kensy F, Müller C, Büchs J. Mikrofluidische pH-Reglung und Fed-Batch-Fermentation in Mikrotiterplatten. CHEM-ING-TECH 2009. [DOI: 10.1002/cite.200950319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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47
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Regestein L, Knabben I, Lerchner J, Maskow T, Büchs J. Messung der Wärmeproduktion mikrobieller Kulturen mittels Chip-Kalorimeter und Reaktorkalorimeter. CHEM-ING-TECH 2009. [DOI: 10.1002/cite.200950215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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48
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Seletzky JM, Otten K, Lotter S, Fricke J, Peter CP, Maier HR, Büchs J. A simple and inexpensive method for investigating microbiological, enzymatic, or inorganic catalysis using standard histology and microbiology laboratory equipment: assembly, mass transfer properties, hydrodynamic conditions and evaluation. Biotech Histochem 2009; 81:133-8. [PMID: 17129996 DOI: 10.1080/10520290601063784] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
We introduce a generic, simple, and inexpensive method for performing microbiological, enzymatic, or inorganic catalysis with solids using standard histology and microbiology laboratory equipment. Histology cassettes were used to standardize hydrodynamic conditions and to protect the catalysts and their solid supports. Histology cassettes have the following advantages: they are readily available, inexpensive, solvent and acid resistant, automatable, and the slots in the cassette walls allow liquid to circulate freely. Standard Erlenmeyer flasks were used as reaction vessels. We developed a new camera to observe the movement and position of the histology cassettes as well as the liquid in the Erlenmeyer flasks. The camera produces a stable image of the rotating liquid in the Erlenmeyer flask. This visualization method revealed that in a 250 ml Erlenmeyer flask, stable operating conditions are achieved at a shaking frequency of 300 rpm and a fill volume of 30 ml. In vessels with vertical walls, such as beakers or laboratory bottles, the movement of the histology cassette is not reproducible. Mass transfer characterization using a biological model system and the chemical sulfite-oxidation method revealed that the histology cassette does not influence gas-liquid mass transfer.
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Affiliation(s)
- J M Seletzky
- Biochemical Engineering, RWTH Aachen University, Sammelbau Biologie, Worringerweg 1, 52056, Aachen, Germany.
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Peters M, Zavrel M, Kahlen J, Schmidt T, Ansorge-Schumacher M, Leitner W, Büchs J, Greiner L, Spiess A. Systematic Approach to Solvent Selection for Biphasic Systems with a Combination of COSMO-RS and a Dynamic Modeling Tool. Eng Life Sci 2008. [DOI: 10.1002/elsc.200800037] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Azizan A, Büchs J. Effectiveness and Measurement of Liquid Distribution in Shake Flask Using Fluorescence Method. CHEM-ING-TECH 2008. [DOI: 10.1002/cite.200750702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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