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Medeiros Garcia Alcântara J, Iannacci F, Morbidelli M, Sponchioni M. Soft sensor based on Raman spectroscopy for the in-line monitoring of metabolites and polymer quality in the biomanufacturing of polyhydroxyalkanoates. J Biotechnol 2023; 377:23-33. [PMID: 37879569 DOI: 10.1016/j.jbiotec.2023.10.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 10/04/2023] [Accepted: 10/16/2023] [Indexed: 10/27/2023]
Abstract
Polyhydroxyalkanoates (PHA) are among the most promising bio-based alternatives to conventional petroleum-based plastics. These biodegradable polyesters can in fact be produced by fermentation from bacteria like Cupriavidus necator, thus reducing the environmental footprint of the manufacturing process. However, ensuring consistent product quality attributes is a major challenge of biomanufacturing. To address this issue, the implementation of real-time monitoring tools is essential to increase process understanding, enable a prompt response to possible process deviations and realize on-line process optimization. In this work, a soft sensor based on in situ Raman spectroscopy was developed and applied to the in-line monitoring of PHA biomanufacturing. This strategy allows the collection of quantitative information directly from the culture broth, without the need for sampling, and at high frequency. In fact, through an optimized multivariate data analysis pipeline, this soft sensor allows monitoring cell dry weight, as well as carbon and nitrogen source concentrations with root mean squared errors (RMSE) equal to 3.71, 7 and 0.03 g/L, respectively. In addition, this tool allows the in-line monitoring of intracellular PHA accumulation, with an RMSE of 14 gPHA/gCells. For the first time, also the number and weight average molecular weights of the polymer produced could be monitored, with RMSE of 8.7E4 and 11.6E4 g/mol, respectively. Overall, this work demonstrates the potential of Raman spectroscopy in the in-line monitoring of biotechnology processes, leading to the simultaneous measurement of several process variables in real time without the need of sampling and labor-intensive sample preparations.
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Affiliation(s)
- João Medeiros Garcia Alcântara
- Dept. of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, via Mancinelli 7, Milano 20131, Italy
| | - Francesco Iannacci
- Dept. of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, via Mancinelli 7, Milano 20131, Italy
| | - Massimo Morbidelli
- Dept. of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, via Mancinelli 7, Milano 20131, Italy
| | - Mattia Sponchioni
- Dept. of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, via Mancinelli 7, Milano 20131, Italy.
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Schiewe T, Gutschmann B, Santolin L, Waldburger S, Neubauer P, Hass R, Riedel SL. Real-time monitoring of biomass during Escherichia coli high-cell-density cultivations by in-line photon density wave spectroscopy. Biotechnol Bioeng 2023; 120:2880-2889. [PMID: 37272419 DOI: 10.1002/bit.28460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 05/19/2023] [Accepted: 05/22/2023] [Indexed: 06/06/2023]
Abstract
An efficient monitoring and control strategy is the basis for a reliable production process. Conventional optical density (OD) measurements involve superpositions of light absorption and scattering, and the results are only given in arbitrary units. In contrast, photon density wave (PDW) spectroscopy is a dilution-free method that allows independent quantification of both effects with defined units. For the first time, PDW spectroscopy was evaluated as a novel optical process analytical technology tool for real-time monitoring of biomass formation in Escherichia coli high-cell-density fed-batch cultivations. Inline PDW measurements were compared to a commercially available inline turbidity probe and with offline measurements of OD and cell dry weight (CDW). An accurate correlation of the reduced PDW scattering coefficient µs ' with CDW was observed in the range of 5-69 g L-1 (R2 = 0.98). The growth rates calculated based on µs ' were comparable to the rates determined with all reference methods. Furthermore, quantification of the reduced PDW scattering coefficient µs ' as a function of the absorption coefficient µa allowed direct detection of unintended process trends caused by overfeeding and subsequent acetate accumulation. Inline PDW spectroscopy can contribute to more robust bioprocess monitoring and consequently improved process performance.
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Affiliation(s)
- Thomas Schiewe
- Institute of Chemistry, innoFSPEC, University of Potsdam, Potsdam, Germany
- PDW Analytics GmbH, Potsdam, Germany
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Berlin, Germany
| | - Björn Gutschmann
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Berlin, Germany
| | - Lara Santolin
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Berlin, Germany
| | - Saskia Waldburger
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Berlin, Germany
| | - Peter Neubauer
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Berlin, Germany
| | - Roland Hass
- Institute of Chemistry, innoFSPEC, University of Potsdam, Potsdam, Germany
- PDW Analytics GmbH, Potsdam, Germany
| | - Sebastian L Riedel
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Berlin, Germany
- Department VIII-Mechanical Engineering, Event Technology and Process Engineering, Environmental and Bioprocess Engineering Laboratory, Berliner Hochschule für Technik, Berlin, Germany
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Riedel SL, Donicz EN, Ferré-Aparicio P, Santolin L, Marbà-Ardébol AM, Neubauer P, Junne S. Workflow for shake flask and plate cultivations with fats for polyhydroxyalkanoate bioproduction. Appl Microbiol Biotechnol 2023:10.1007/s00253-023-12599-w. [PMID: 37266584 DOI: 10.1007/s00253-023-12599-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 05/08/2023] [Accepted: 05/11/2023] [Indexed: 06/03/2023]
Abstract
Since natural resources for the bioproduction of commodity chemicals are scarce, waste animal fats (WAF) are an interesting alternative biogenic residual feedstock. They appear as by-product from meat production, but several challenges are related to their application: first, the high melting points (up to 60 °C); and second, the insolubility in the polar water phase of cultivations. This leads to film and clump formation in shake flasks and microwell plates, which inhibits microbial consumption. In this study, different flask and well designs were investigated to identify the most suitable experimental set-up and further to create an appropriate workflow to achieve the required reproducibility of growth and product synthesis. The dissolved oxygen concentration was measured in-line throughout experiments. It became obvious that the gas mass transfer differed strongly among the shake flask design variants in cultivations with the polyhydroxyalkanoate (PHA) accumulating organism Ralstonia eutropha. A high reproducibility was achieved for certain flask or well plate design variants together with tailored cultivation conditions. Best results were achieved with bottom baffled glass and bottom baffled single-use shake flasks with flat membranes, namely, >6 g L-1 of cell dry weight (CDW) with >80 wt% polyhydroxybutyrate (PHB) from 1 wt% WAF. Improved pre-emulsification conditions for round microwell plates resulted in a production of 14 g L-1 CDW with a PHA content of 70 wt% PHB from 3 wt% WAF. The proposed workflow allows the rapid examination of fat material as feedstock, in the microwell plate and shake flask scale, also beyond PHA production. KEY POINTS: • Evaluation of shake flask designs for cultivating with hydrophobic raw materials • Development of a workflow for microwell plate cultivations with hydrophobic raw materials • Production of polyhydroxyalkanoate in small scale experiments from waste animal fat.
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Affiliation(s)
- Sebastian L Riedel
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Ackerstraße 76 ACK 24, D-13355, Berlin, Germany
- Department VIII - Mechanical Engineering, Event Technology and Process Engineering, Laboratory of Environmental and Bioprocess Engineering, Berliner Hochschule für Technik, Seestr. 64, Berlin, D-13347, Germany
| | - Ewelina N Donicz
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Ackerstraße 76 ACK 24, D-13355, Berlin, Germany
| | - Paula Ferré-Aparicio
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Ackerstraße 76 ACK 24, D-13355, Berlin, Germany
| | - Lara Santolin
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Ackerstraße 76 ACK 24, D-13355, Berlin, Germany
| | - Anna-Maria Marbà-Ardébol
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Ackerstraße 76 ACK 24, D-13355, Berlin, Germany
| | - Peter Neubauer
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Ackerstraße 76 ACK 24, D-13355, Berlin, Germany
| | - Stefan Junne
- Institute of Biotechnology, Chair of Bioprocess Engineering, Technische Universität Berlin, Ackerstraße 76 ACK 24, D-13355, Berlin, Germany.
- Department of Chemistry and Bioscience, Aalborg University Esbjerg, Niels Bohrs Vej 8, DK-6700, Esbjerg, Denmark.
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Santolin L, Thiele I, Neubauer P, Riedel SL. Tailoring the HHx monomer content of P(HB- co-HHx) by flexible substrate compositions: scale-up from deep-well-plates to laboratory bioreactor cultivations. Front Bioeng Biotechnol 2023; 11:1081072. [PMID: 37214303 PMCID: PMC10193151 DOI: 10.3389/fbioe.2023.1081072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 04/18/2023] [Indexed: 05/24/2023] Open
Abstract
The enhanced material properties exhibited by the microbially synthetized polyhydroxyalkanoate (PHA) copolymer poly(hydroxybutyrate-co-hydroxyhexanoate) [P(HB-co-HHx)] evidence that this naturally biodegrading biopolymer could replace various functionalities of established petrochemical plastics. In fact, the thermal processability, toughness and degradation rate of P(HB-co-HHx) can be tuned by modulating its HHx molar content enabling to manufacture polymers à-la-carte. We have developed a simple batch strategy to precisely control the HHx content of P(HB-co-HHx) to obtain tailor-made PHAs with defined properties. By adjusting the ratio of fructose to canola oil as substrates for the cultivation of recombinant Ralstonia eutropha Re2058/pCB113, the molar fraction of HHx in P(HB-co-HHx) could be adjusted within a range of 2-17 mol% without compromising polymer yields. The chosen strategy proved to be robust from the mL-scale in deep-well-plates to 1-L batch bioreactor cultivations.
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Affiliation(s)
- Lara Santolin
- Technische Universität Berlin, Institute of Biotechnology, Chair of Bioprocess Engineering, Berlin, Germany
| | - Isabel Thiele
- Technische Universität Berlin, Institute of Biotechnology, Chair of Bioprocess Engineering, Berlin, Germany
| | - Peter Neubauer
- Technische Universität Berlin, Institute of Biotechnology, Chair of Bioprocess Engineering, Berlin, Germany
| | - Sebastian L. Riedel
- Technische Universität Berlin, Institute of Biotechnology, Chair of Bioprocess Engineering, Berlin, Germany
- Berliner Hochschule für Technik, Department VIII – Mechanical Engineering, Event Technology and Process Engineering, Laboratory of Environmental and Bioprocess Engineering, Berlin, Germany
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Gutschmann B, Huang B, Santolin L, Thiele I, Neubauer P, Riedel SL. Native feedstock options for the polyhydroxyalkanoate industry in Europe: A review. Microbiol Res 2022; 264:127177. [DOI: 10.1016/j.micres.2022.127177] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 08/05/2022] [Accepted: 08/24/2022] [Indexed: 11/26/2022]
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Gutschmann B, Högl TH, Huang B, Maldonado Simões M, Junne S, Neubauer P, Grimm T, Riedel SL. Polyhydroxyalkanoate production from animal by-products: Development of a pneumatic feeding system for solid fat/protein-emulsions. Microb Biotechnol 2022; 16:286-294. [PMID: 36168730 PMCID: PMC9871516 DOI: 10.1111/1751-7915.14150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 09/02/2022] [Accepted: 09/10/2022] [Indexed: 01/27/2023] Open
Abstract
Fat-containing animal by-product streams are locally available in large quantities. Depending on their quality, they can be inexpensive substrates for biotechnological processes. To accelerate industrial polyhydroxyalkanoate (PHA) bioplastic production, the development of efficient bioprocesses that are based on animal by-product streams is a promising approach to reduce overall production costs. However, the solid nature of animal by-product streams requires a tailor-made process development. In this study, a fat/protein-emulsion (FPE), which is a by-product stream from industrial-scale pharmaceutical heparin production and of which several hundred tons are available annually, was evaluated for PHA production with Ralstonia eutropha. The FPE was used as the sole source of carbon and nitrogen in shake flask and bioreactor cultivations. A tailored pneumatic feeding system was built for laboratory bioreactors to facilitate fed-batch cultivations with the solid FPE. The process yielded up to 51 g L-1 cell dry weight containing 71 wt% PHA with a space-time yield of 0.6 gPHA L-1 h-1 without using any carbon or nitrogen sources other than FPE. The presented approach highlights the potential of animal by-product stream valorization into PHA and contributes to a transition towards a circular bioeconomy.
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Affiliation(s)
- Björn Gutschmann
- Technische Universität Berlin, Chair of Bioprocess EngineeringBerlinGermany
| | - Thomas H. Högl
- Technische Universität Berlin, Chair of Bioprocess EngineeringBerlinGermany
| | - Boyang Huang
- Technische Universität Berlin, Chair of Bioprocess EngineeringBerlinGermany
| | | | - Stefan Junne
- Technische Universität Berlin, Chair of Bioprocess EngineeringBerlinGermany
| | - Peter Neubauer
- Technische Universität Berlin, Chair of Bioprocess EngineeringBerlinGermany
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Gutschmann B, Waldburger S, Schiewe T, Aulich L, Münzberg M, Neubauer P, Riedel S. Polyhydroxyalkanoates from oleaginous waste streams: Production and control strategies. CHEM-ING-TECH 2022. [DOI: 10.1002/cite.202255099] [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. Gutschmann
- Technische Universität Berlin Chair of Bioprocess Engineering Ackerstr. 76 13355 Berlin Germany
| | - S. Waldburger
- Technische Universität Berlin Chair of Bioprocess Engineering Ackerstr. 76 13355 Berlin Germany
| | - T. Schiewe
- Technische Universität Berlin Chair of Bioprocess Engineering Ackerstr. 76 13355 Berlin Germany
- University of Potsdam innoFSPEC Am Mühlenberg 3 14476 Potsdam Germany
| | - L. Aulich
- Technische Universität Berlin Chair of Bioprocess Engineering Ackerstr. 76 13355 Berlin Germany
| | - M. Münzberg
- University of Potsdam innoFSPEC Am Mühlenberg 3 14476 Potsdam Germany
| | - P. Neubauer
- Technische Universität Berlin Chair of Bioprocess Engineering Ackerstr. 76 13355 Berlin Germany
| | - S. L. Riedel
- Technische Universität Berlin Chair of Bioprocess Engineering Ackerstr. 76 13355 Berlin Germany
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Gutschmann B, Maldonado Simões M, Schiewe T, Schröter ES, Münzberg M, Neubauer P, Bockisch A, Riedel SL. Continuous feeding strategy for polyhydroxyalkanoate production from solid waste animal fat at laboratory- and pilot-scale. Microb Biotechnol 2022; 16:295-306. [PMID: 35921398 PMCID: PMC9871520 DOI: 10.1111/1751-7915.14104] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Revised: 06/03/2022] [Accepted: 06/05/2022] [Indexed: 01/27/2023] Open
Abstract
Bioconversion of waste animal fat (WAF) to polyhydroxyalkanoates (PHAs) is an approach to lower the production costs of these plastic alternatives. However, the solid nature of WAF requires a tailor-made process development. In this study, a double-jacket feeding system was built to thermally liquefy the WAF to employ a continuous feeding strategy. During laboratory-scale cultivations with Ralstonia eutropha Re2058/pCB113, 70% more PHA (45 gPHA L-1 ) and a 75% higher space-time yield (0.63 gPHA L-1 h-1 ) were achieved compared to previously reported fermentations with solid WAF. During the development process, growth and PHA formation were monitored in real-time by in-line photon density wave spectroscopy. The process robustness was further evaluated during scale-down fermentations employing an oscillating aeration, which did not alter the PHA yield although cells encountered periods of oxygen limitation. Flow cytometry with propidium iodide staining showed that more than two-thirds of the cells were viable at the end of the cultivation and viability was even little higher in the scale-down cultivations. Application of this feeding system at 150-L pilot-scale cultivation yielded in 31.5 gPHA L-1 , which is a promising result for the further scale-up to industrial scale.
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Affiliation(s)
- Björn Gutschmann
- Technische Universität BerlinChair of Bioprocess EngineeringBerlinGermany
| | | | | | - Edith S. Schröter
- Technische Universität BerlinChair of Bioprocess EngineeringBerlinGermany
| | | | - Peter Neubauer
- Technische Universität BerlinChair of Bioprocess EngineeringBerlinGermany
| | - Anika Bockisch
- Technische Universität BerlinChair of Bioprocess EngineeringBerlinGermany,Bio‐PAT e.VBerlinGermany
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Rodríguez Lorenzo F, Placer Lorenzo M, Herrero Castilla L, Álvarez Rodríguez JA, Iglesias S, Gómez S, Fernández Montenegro JM, Rueda E, Diez-Montero R, Garcia J, Gonzalez-Flo E. Monitoring PHB production in Synechocystis sp. with hyperspectral images. Water Sci Technol 2022; 86:211-226. [PMID: 35838292 DOI: 10.2166/wst.2022.194] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Microalgae wastewater treatment systems have the potential for producing added-value products. More specifically, cyanobacteria are able to accumulate polyhydroxybutyrates (PHBs), which can be extracted and used for bioplastics production. Nonetheless, PHB production requires proper culture conditions and continue monitoring, challenging the state-of-the-art technologies. The aim of this study was to investigate the application of hyperspectral technologies to monitor cyanobacteria population growth and PHB production. We have established a ground-breaking measurement method able to discern spectral reflectance changes from light emitted to cyanobacteria in different phases. All in all, enabling to distinguish between cyanobacteria growth phase and PHB accumulation phase. Furthermore, first tests of classification algorithms used for machine learning and image recognition technologies had been applied to automatically recognize the different cyanobacteria species from a complex microbial community containing cyanobacteria and microalgae cultivated in pilot-scale photobioreactors (PBRs). We have defined three main indicators for monitoring PHB production: (i) cyanobacteria specific-strain density, (ii) differentiate between growth and PHB-accumulation and (iii) chlorosis progression. The results presented in this study represent an interesting alternative for traditional measurements in cyanobacteria PHB production and its application in pilot-scale PBRs. Although not directly determining the amount of PHB production, they would give insights on the undergoing processes.
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Affiliation(s)
- Francisco Rodríguez Lorenzo
- Robotics and Control Unit, AIMEN, Centro de Aplicaciones Láser, Polígono Industrial de Cataboi SUR-PPI-2 (Sector 2) Parcela 3, O Porriño (Pontevedra) 36418, Spain
| | - Miguel Placer Lorenzo
- Robotics and Control Unit, AIMEN, Centro de Aplicaciones Láser, Polígono Industrial de Cataboi SUR-PPI-2 (Sector 2) Parcela 3, O Porriño (Pontevedra) 36418, Spain
| | - Luz Herrero Castilla
- Environmental Technologies Unit, AIMEN, Centro de Aplicaciones Láser, Polígono Industrial de Cataboi SUR-PPI-2 (Sector 2) Parcela 3, O Porriño (Pontevedra) 36418, Spain
| | - Juan Antonio Álvarez Rodríguez
- Environmental Technologies Unit, AIMEN, Centro de Aplicaciones Láser, Polígono Industrial de Cataboi SUR-PPI-2 (Sector 2) Parcela 3, O Porriño (Pontevedra) 36418, Spain
| | - Sandra Iglesias
- Robotics and Control Unit, AIMEN, Centro de Aplicaciones Láser, Polígono Industrial de Cataboi SUR-PPI-2 (Sector 2) Parcela 3, O Porriño (Pontevedra) 36418, Spain
| | - Santiago Gómez
- Environmental Technologies Unit, AIMEN, Centro de Aplicaciones Láser, Polígono Industrial de Cataboi SUR-PPI-2 (Sector 2) Parcela 3, O Porriño (Pontevedra) 36418, Spain
| | - Juan Manuel Fernández Montenegro
- Robotics and Control Unit, AIMEN, Centro de Aplicaciones Láser, Polígono Industrial de Cataboi SUR-PPI-2 (Sector 2) Parcela 3, O Porriño (Pontevedra) 36418, Spain
| | - Estel Rueda
- GEMMA-Group of Environmental Engineering and Microbiology, Department of Civil and Environmental Engineering, Escola d'Enginyeria de Barcelona Est (EEBE), Universitat Politècnica de Catalunya-BarcelonaTech, Av. Eduard Maristany 16, Building C5.1, Barcelona E-08019, Spain E-mail:
| | - Rubén Diez-Montero
- GEMMA-Group of Environmental Engineering and Microbiology, Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya (UPC), c/ Jordi Girona 1-3, Building D1, Barcelona E-08034, Spain; GIA - Group of Environmental Engineering, Department of Water and Environmental Sciences and Technologies, Universidad de Cantabria, Santander, Spain
| | - Joan Garcia
- GEMMA-Group of Environmental Engineering and Microbiology, Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya (UPC), c/ Jordi Girona 1-3, Building D1, Barcelona E-08034, Spain
| | - Eva Gonzalez-Flo
- GEMMA-Group of Environmental Engineering and Microbiology, Department of Civil and Environmental Engineering, Escola d'Enginyeria de Barcelona Est (EEBE), Universitat Politècnica de Catalunya-BarcelonaTech, Av. Eduard Maristany 16, Building C5.1, Barcelona E-08019, Spain E-mail:
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Abd El-Malek F, Rofeal M, Zabed HM, Nizami AS, Rehan M, Qi X. Microorganism-mediated algal biomass processing for clean products manufacturing: Current status, challenges and future outlook. Fuel 2022; 311:122612. [DOI: 10.1016/j.fuel.2021.122612] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Sandmann M, Münzberg M, Bressel L, Reich O, Hass R. Inline monitoring of high cell density cultivation of Scenedesmus rubescens in a mesh ultra-thin layer photobioreactor by photon density wave spectroscopy. BMC Res Notes 2022; 15:54. [PMID: 35168633 PMCID: PMC8845379 DOI: 10.1186/s13104-022-05943-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 02/01/2022] [Indexed: 11/30/2022] Open
Abstract
Objective Due to multiple light scattering that occurs inside and between cells, quantitative optical spectroscopy in turbid biological suspensions is still a major challenge. This includes also optical inline determination of biomass in bioprocessing. Photon Density Wave (PDW) spectroscopy, a technique based on multiple light scattering, enables the independent and absolute determination of optical key parameters of concentrated cell suspensions, which allow to determine biomass during cultivation. Results A unique reactor type, called “mesh ultra-thin layer photobioreactor” was used to create a highly concentrated algal suspension. PDW spectroscopy measurements were carried out continuously in the reactor without any need of sampling or sample preparation, over 3 weeks, and with 10-min time resolution. Conventional dry matter content and coulter counter measurements have been employed as established offline reference analysis. The PBR allowed peak cell dry weight (CDW) of 33.4 g L−1. It is shown that the reduced scattering coefficient determined by PDW spectroscopy is strongly correlated with the biomass concentration in suspension and is thus suitable for process understanding. The reactor in combination with the fiber-optical measurement approach will lead to a better process management. Supplementary Information The online version contains supplementary material available at 10.1186/s13104-022-05943-2.
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Sirohi R, Lee JS, Yu BS, Roh H, Sim SJ. Sustainable production of polyhydroxybutyrate from autotrophs using CO 2 as feedstock: Challenges and opportunities. Bioresour Technol 2021; 341:125751. [PMID: 34416655 DOI: 10.1016/j.biortech.2021.125751] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [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: 06/23/2021] [Revised: 08/05/2021] [Accepted: 08/07/2021] [Indexed: 05/05/2023]
Abstract
Due to industrialization and rapid increase in world population, the global energy consumption has increased dramatically. As a consequence, there is increased consumption of fossil fuels, leading to a rapid increase in CO2 concentration in the atmosphere. This accumulated CO2 can be efficiently used by autotrophs as a carbon source to produce chemicals and biopolymers. There has been increasing attention on the production of polyhydroxybutyrate (PHB), a biopolymer, with focus on reducing the production cost. For this, cheaper renewable feedstocks, molecular tools, including metabolic and genetic engineering have been explored to improve microbial strains along with process engineering aspects for scale-up of PHB production. This review discusses the recent advents on the utilization of CO2 as feedstock especially by engineered autotrophs, for sustainable production of PHB. The review also discusses the innovations in cultivation technology and process monitoring while understanding the underlying mechanisms for CO2 to biopolymer conversion.
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Affiliation(s)
- Ranjna Sirohi
- Department of Chemical & Biological Engineering, Korea University, Seoul 136713, Republic of Korea
| | - Jeong Seop Lee
- Department of Chemical & Biological Engineering, Korea University, Seoul 136713, Republic of Korea
| | - Byung Sun Yu
- Department of Chemical & Biological Engineering, Korea University, Seoul 136713, Republic of Korea
| | - Hyejin Roh
- Department of Chemical & Biological Engineering, Korea University, Seoul 136713, Republic of Korea
| | - Sang Jun Sim
- Department of Chemical & Biological Engineering, Korea University, Seoul 136713, Republic of Korea.
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Doppler P, Gasser C, Kriechbaum R, Ferizi A, Spadiut O. In Situ Quantification of Polyhydroxybutyrate in Photobioreactor Cultivations of Synechocystis sp. Using an Ultrasound-Enhanced ATR-FTIR Spectroscopy Probe. Bioengineering (Basel) 2021; 8:bioengineering8090129. [PMID: 34562950 PMCID: PMC8469707 DOI: 10.3390/bioengineering8090129] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 07/20/2021] [Revised: 09/10/2021] [Accepted: 09/17/2021] [Indexed: 11/16/2022] Open
Abstract
Polyhydroxybutyrate (PHB) is a very promising alternative to most petroleum-based plastics with the huge advantage of biodegradability. Biotechnological production processes utilizing cyanobacteria as sustainable source of PHB require fast in situ process analytical technology (PAT) tools for sophisticated process monitoring. Spectroscopic probes supported by ultrasound particle traps provide a powerful technology for in-line, nondestructive, and real-time process analytics in photobioreactors. This work shows the great potential of using ultrasound particle manipulation to improve spectroscopic attenuated total reflection Fourier-transformed mid-infrared (ATR-FTIR) spectra as a monitoring tool for PHB production processes in photobioreactors.
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Affiliation(s)
- Philipp Doppler
- Research Division Biochemical Engineering, Institute of Chemical, Environmental and Bioscience Engineering, TU Wien, Gumpendorfer Strasse 1a, 1060 Vienna, Austria; (P.D.); (R.K.)
| | - Christoph Gasser
- usePAT GmbH, Schönbrunner Strasse 231/2.01, 1120 Vienna, Austria; (C.G.); (A.F.)
| | - Ricarda Kriechbaum
- Research Division Biochemical Engineering, Institute of Chemical, Environmental and Bioscience Engineering, TU Wien, Gumpendorfer Strasse 1a, 1060 Vienna, Austria; (P.D.); (R.K.)
| | - Ardita Ferizi
- usePAT GmbH, Schönbrunner Strasse 231/2.01, 1120 Vienna, Austria; (C.G.); (A.F.)
| | - Oliver Spadiut
- Research Division Biochemical Engineering, Institute of Chemical, Environmental and Bioscience Engineering, TU Wien, Gumpendorfer Strasse 1a, 1060 Vienna, Austria; (P.D.); (R.K.)
- Correspondence: ; Tel.: +43-1-58801-166473
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Gutschmann B, Bock MCE, Jahns S, Neubauer P, Brigham CJ, Riedel SL. Untargeted metabolomics analysis of Ralstonia eutropha during plant oil cultivations reveals the presence of a fucose salvage pathway. Sci Rep 2021; 11:14267. [PMID: 34253787 PMCID: PMC8275744 DOI: 10.1038/s41598-021-93720-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [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: 01/20/2021] [Accepted: 06/29/2021] [Indexed: 02/06/2023] Open
Abstract
Process engineering of biotechnological productions can benefit greatly from comprehensive analysis of microbial physiology and metabolism. Ralstonia eutropha (syn. Cupriavidus necator) is one of the best studied organisms for the synthesis of biodegradable polyhydroxyalkanoate (PHA). A comprehensive metabolomic study during bioreactor cultivations with the wild-type (H16) and an engineered (Re2058/pCB113) R. eutropha strain for short- and or medium-chain-length PHA synthesis has been carried out. PHA production from plant oil was triggered through nitrogen limitation. Sample quenching allowed to conserve the metabolic states of the cells for subsequent untargeted metabolomic analysis, which consisted of GC-MS and LC-MS analysis. Multivariate data analysis resulted in identification of significant changes in concentrations of oxidative stress-related metabolites and a subsequent accumulation of antioxidative compounds. Moreover, metabolites involved in the de novo synthesis of GDP-L-fucose as well as the fucose salvage pathway were identified. The related formation of fucose-containing exopolysaccharides potentially supports the emulsion-based growth of R. eutropha on plant oils.
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Affiliation(s)
- Björn Gutschmann
- grid.6734.60000 0001 2292 8254Chair of Bioprocess Engineering, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany
| | - Martina C. E. Bock
- grid.6734.60000 0001 2292 8254Chair of Bioprocess Engineering, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany
| | - Stefan Jahns
- grid.6734.60000 0001 2292 8254Chair of Bioprocess Engineering, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany
| | - Peter Neubauer
- grid.6734.60000 0001 2292 8254Chair of Bioprocess Engineering, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany
| | - Christopher J. Brigham
- grid.422596.e0000 0001 0639 028XSchool of Engineering, Wentworth Institute of Technology, Boston, MA USA
| | - Sebastian L. Riedel
- grid.6734.60000 0001 2292 8254Chair of Bioprocess Engineering, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany
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Santolin L, Waldburger S, Neubauer P, Riedel SL. Substrate-Flexible Two-Stage Fed-Batch Cultivations for the Production of the PHA Copolymer P(HB- co-HHx) With Cupriavidus necator Re2058/pCB113. Front Bioeng Biotechnol 2021; 9:623890. [PMID: 33829008 PMCID: PMC8020817 DOI: 10.3389/fbioe.2021.623890] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [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: 10/30/2020] [Accepted: 03/02/2021] [Indexed: 11/13/2022] Open
Abstract
Recent studies of the impact and dimension of plastic pollution have drawn the attention to finding more sustainable alternatives to fossil-based plastics. Microbially produced polyhydroxyalkanoates (PHAs) biopolymers are strong candidates to replace conventional plastic materials, due to their true biodegradability and versatile properties. However, widespread use of these polymers is still hindered by their high cost of production. In the present study, we target high yields of the PHA copolymer poly(hydroxybutyrate-co-hydroxyhexanoate) [P(HB-co-HHx)] using a substrate-flexible two-stage fed-batch approach for the cultivation of the recombinant Cupriavidus necator strain Re2058/pCB113. A more substrate-flexible process allows to cope with constant price fluctuations and discontinuous supply of feedstocks on the market. Utilizing fructose for biomass accumulation and rapeseed oil for polymer production resulted in a final biomass concentration of 124 g L-1 with a polymer content of 86 wt% holding 17 mol% of HHx. Productivities were further optimized by operating the biomass accumulation stage in a "drain and fill" modus where 10% of the culture broth was recycled for semi-continuous biomass accumulation, after transferring 90% to a second bioreactor for PHA production. This strategy succeeded in shortening process times rising productivity yields to ∼1.45 g L-1 h-1.
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Affiliation(s)
- Lara Santolin
- Chair of Bioprocess Engineering, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany
| | - Saskia Waldburger
- Chair of Bioprocess Engineering, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany
| | - Peter Neubauer
- Chair of Bioprocess Engineering, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany
| | - Sebastian L Riedel
- Chair of Bioprocess Engineering, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany
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Saad V, Gutschmann B, Grimm T, Widmer T, Neubauer P, Riedel SL. Low-quality animal by-product streams for the production of PHA-biopolymers: fats, fat/protein-emulsions and materials with high ash content as low-cost feedstocks. Biotechnol Lett 2021; 43:579-587. [PMID: 33367969 PMCID: PMC7873092 DOI: 10.1007/s10529-020-03065-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 12/12/2020] [Indexed: 01/01/2023]
Abstract
OBJECTIVE The rapid accumulation of crude-oil based plastics in the environment is posing a fundamental threat to the future of mankind. The biodegradable and bio-based polyhydroxyalkanoates (PHAs) can replace conventional plastics, however, their current production costs are not competitive and therefore prohibiting PHAs from fulfilling their potential. RESULTS Different low-quality animal by-products, which were separated by thermal hydrolysis into a fat-, fat/protein-emulsion- and mineral-fat-mixture- (material with high ash content) phase, were successfully screened as carbon sources for the production of PHA. Thereby, Ralstonia eutropha Re2058/pCB113 accumulated the short- and medium-chain-length copolymer poly(hydroxybutyrate-co-hydroxyhexanoate) [P(HB-co-HHx)]. Up to 90 wt% PHA per cell dry weight with HHx-contents of 12-26 mol% were produced in shake flask cultivations. CONCLUSION In future, the PHA production cost could be lowered by using the described animal by-product streams as feedstock.
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Affiliation(s)
- Victoria Saad
- Chair of Bioprocess Engineering, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany
| | - Björn Gutschmann
- Chair of Bioprocess Engineering, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany
| | | | | | - Peter Neubauer
- Chair of Bioprocess Engineering, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany
| | - Sebastian L Riedel
- Chair of Bioprocess Engineering, Institute of Biotechnology, Technische Universität Berlin, Berlin, Germany.
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Schlappa S, Brenker LJ, Bressel L, Hass R, Münzberg M. Process Characterization of Polyvinyl Acetate Emulsions Applying Inline Photon Density Wave Spectroscopy at High Solid Contents. Polymers (Basel) 2021; 13:669. [PMID: 33672343 PMCID: PMC7926705 DOI: 10.3390/polym13040669] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [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: 01/30/2021] [Revised: 02/18/2021] [Accepted: 02/19/2021] [Indexed: 11/26/2022] Open
Abstract
The high solids semicontinuous emulsion polymerization of polyvinyl acetate using poly (vinyl alcohol-co-vinyl acetate) as protective colloid is investigated by optical spectroscopy. The suitability of Photon Density Wave (PDW) spectroscopy as inline Process Analytical Technology (PAT) for emulsion polymerization processes at high solid contents (>40% (w/w)) is studied and evaluated. Inline data on absorption and scattering in the dispersion is obtained in real-time. The radical polymerization of vinyl acetate to polyvinyl acetate using ascorbic acid and sodium persulfate as redox initiator system and poly (vinyl alcohol-co-vinyl acetate) as protective colloid is investigated. Starved-feed radical emulsion polymerization yielded particle sizes in the nanometer size regime. PDW spectroscopy is used to monitor the progress of polymerization by studying the absorption and scattering properties during the synthesis of dispersions with increasing monomer amount and correspondingly decreasing feed rate of protective colloid. Results are compared to particle sizes determined with offline dynamic light scattering (DLS) and static light scattering (SLS) during the synthesis.
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Affiliation(s)
- Stephanie Schlappa
- Department of Physical Chemistry, innoFSPEC, University of Potsdam, Am Muehlenberg 3, 14476 Potsdam, Germany; (L.J.B.); (L.B.); (R.H.); (M.M.)
| | - Lee Josephine Brenker
- Department of Physical Chemistry, innoFSPEC, University of Potsdam, Am Muehlenberg 3, 14476 Potsdam, Germany; (L.J.B.); (L.B.); (R.H.); (M.M.)
| | - Lena Bressel
- Department of Physical Chemistry, innoFSPEC, University of Potsdam, Am Muehlenberg 3, 14476 Potsdam, Germany; (L.J.B.); (L.B.); (R.H.); (M.M.)
| | - Roland Hass
- Department of Physical Chemistry, innoFSPEC, University of Potsdam, Am Muehlenberg 3, 14476 Potsdam, Germany; (L.J.B.); (L.B.); (R.H.); (M.M.)
- PDW Analytics GmbH, Geiselbergstraße 4, 14476 Potsdam, Germany
| | - Marvin Münzberg
- Department of Physical Chemistry, innoFSPEC, University of Potsdam, Am Muehlenberg 3, 14476 Potsdam, Germany; (L.J.B.); (L.B.); (R.H.); (M.M.)
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Volova T, Sapozhnikova K, Zhila N. Cupriavidus necator B-10646 growth and polyhydroxyalkanoates production on different plant oils. Int J Biol Macromol 2020; 164:121-130. [DOI: 10.1016/j.ijbiomac.2020.07.095] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 06/26/2020] [Accepted: 07/09/2020] [Indexed: 02/07/2023]
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Abstract
During the two years that have passed since the first volume of “Advances in Polyhydroxyalkanoate (PHA) production” was published, the progress in PHA-related research was indeed tremendous, calling for the next, highly bioprocess- and bioengineering-oriented volume. This editorial paper summarizes and puts into context the contributions to this second volume of the Bioengineering Special Issue; it covers highly topical fields of PHA-related R&D activities, covering, beside the pronounced bioengineering-related articles, the fields of the microbiology of underexplored, but probably emerging, PHA production strains from the groups of Pseudomonas, cyanobacteria, methanotrophs, and from the extremophilic domain of haloarchaea. Moreover, novel second-generation lignocellulose feedstocks for PHA production from agriculture to be used in biorefinery concepts, new approaches for fine-tuning the composition of PHA co- and terpolyesters, process simulation for PHA production from methane-rich natural gas, the challenges associated with rheology-governed oxygen transfer in high cell density cultivations, rapid spectroscopic in-line analytics for process monitoring, and the biomedical application of PHA biopolyesters after appropriate advanced processing are the subjects of the presented studies.
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