Development of carbon plasma-coated multiwell plates for high-throughput mass spectrometric analysis of highly lipophilic fermentation products

Heinig, Uwe; Scholz, Susanne; Dahm, Pia; Grabowy, U.; Jennewein, Stefan

doi:10.1016/j.ab.2010.04.010

Cited by 2 publications

(1 citation statement)

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“…Either the extraction of compounds from commonly used laboratory plastics or the loss of volatiles can be a source of variability. Marques et al [ 15 ] reported unidentified compounds in reactions from interactions of plate material with organic solvents; whereas Heinig et al [ 16 ] reported the adsorption of analytes onto the plate material and extraction of plasticizers from polypropylene resulting in poor recoverability and reproducibility. Similarly, many of the optical online measuring techniques used in scale-down setups are incompatible with organic solvents diminishing the usefulness and applicability of these systems [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Customized microscale approach for optimizing two-phase bio-oxidations of alkanes with high reproducibility

2017

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BackgroundNumerous challenges remain to achieve industrially competitive space–time yields for bio-oxidations. The ability to rapidly screen bioconversion reactions for characterization and optimization is of major importance in bioprocess development and biocatalyst selection; studies at conventional lab scale are time consuming and labor intensive with low experimental throughput. The direct ω-oxyfunctionalization of aliphatic alkanes in a regio- and chemoselective manner is efficiently catalyzed by monooxygenases such as the AlkBGT enzyme complex from Pseudomonas putida under mild conditions. However, the adoption of microscale tools for these highly volatile substrates has been hindered by excessive evaporation and material incompatibility.ResultsThis study developed and validated a robust high-throughput microwell platform for whole-cell two-liquid phase bio-oxidations of highly volatile n-alkanes. Using microwell plates machined from polytetrafluoroethylene and a sealing clamp, highly reproducible results were achieved with no significant variability such as edge effects determined. A design of experiment approach using a response surface methodology was adopted to systematically characterize the system and identify non-limiting conditions for a whole cell bioconversion of dodecane. Using resting E. coli cells to control cell concentration and reducing the fill volume it is possible to operate in non-limiting conditions with respect to oxygen and glucose whilst achieving relevant total product yields (combining 1-dodecanol, dodecanal and dodecanoic acid) of up to 1.5 mmol gDCW−1.ConclusionsOverall, the developed microwell plate greatly improves experimental throughput, accelerating the screening procedures specifically for biocatalytic processes in non-conventional media. Its simplicity, robustness and standardization ensure high reliability of results.Electronic supplementary materialThe online version of this article (doi:10.1186/s12934-017-0788-4) contains supplementary material, which is available to authorized users.

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Section: Introductionmentioning

confidence: 99%