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Main Title: In-Line Monitoring of Polyhydroxyalkanoate (PHA) Production during High-Cell-Density Plant Oil Cultivations Using Photon Density Wave Spectroscopy
Author(s): Gutschmann, Björn
Schiewe, Thomas
Weiske, Manon T.H.
Neubauer, Peter
Hass, Roland
Riedel, Sebastian L.
Type: Article
Language Code: en
Abstract: Polyhydroxyalkanoates (PHAs) are biodegradable plastic-like materials with versatile properties. Plant oils are excellent carbon sources for a cost-effective PHA production, due to their high carbon content, large availability, and comparatively low prices. Additionally, efficient process development and control is required for competitive PHA production, which can be facilitated by on-line or in-line monitoring devices. To this end, we have evaluated photon density wave (PDW) spectroscopy as a new process analytical technology for Ralstonia eutropha (Cupriavidus necator) H16 plant oil cultivations producing polyhydroxybutyrate (PHB) as an intracellular polymer. PDW spectroscopy was used for in-line recording of the reduced scattering coefficient µs’ and the absorption coefficient µa at 638 nm. A correlation of µs’ with the cell dry weight (CDW) and µa with the residual cell dry weight (RCDW) was observed during growth, PHB accumulation, and PHB degradation phases in batch and pulse feed cultivations. The correlation was used to predict CDW, RCDW, and PHB formation in a high-cell-density fed-batch cultivation with a productivity of 1.65 gPHB·L−1·h−1 and a final biomass of 106 g·L−1 containing 73 wt% PHB. The new method applied in this study allows in-line monitoring of CDW, RCDW, and PHA formation.
Issue Date: 19-Sep-2019
Date Available: 18-Nov-2019
DDC Class: 660 Chemische Verfahrenstechnik
Subject(s): polyhydroxyalkanoate
process analytical technologies
plant oil
high-cell-density fed-batch
photon density wave spectroscopy
Ralstonia eutropha
Cupriavidus necator
Sponsor/Funder: BMBF, 03Z22AN12, Zentrum für Innovationskompetenz innoFSPEC, Nachwuchsgruppe Angewandte Analytische Photonik (AAP)
Journal Title: Bioengineering
Publisher: MDPI
Publisher Place: Basel
Volume: 6
Issue: 3
Article Number: 85
Publisher DOI: 10.3390/bioengineering6030085
EISSN: 2306-5354
Appears in Collections:FG Bioverfahrenstechnik » Publications

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