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Journal articles on the topic 'PHB volumetric productivity'

Author: Grafiati

Published: 14 March 2023

Last updated: 31 July 2025

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1

Nikel, Pablo I., Alejandra de Almeida, Evelia C. Melillo, Miguel A. Galvagno, and M. Julia Pettinari. "New Recombinant Escherichia coli Strain Tailored for the Production of Poly(3-Hydroxybutyrate) from Agroindustrial By-Products." Applied and Environmental Microbiology 72, no. 6 (2006): 3949–54. http://dx.doi.org/10.1128/aem.00044-06.

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ABSTRACT A recombinant E. coli strain (K24K) was constructed and evaluated for poly(3-hydroxybutyrate) (PHB) production from whey and corn steep liquor as main carbon and nitrogen sources. This strain bears the pha biosynthetic genes from Azotobacter sp. strain FA8 expressed from a T5 promoter under the control of the lactose operator. K24K does not produce the lactose repressor, ensuring constitutive expression of genes involved in lactose transport and utilization. PHB was efficiently produced by the recombinant strain grown aerobically in fed-batch cultures in a laboratory scale bioreactor

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2

Wang, J., and H. Q. Yu. "Cultivation of polyhydroxybutyrate-rich aerobic granular sludge in a sequencing batch reactor." Water Supply 6, no. 6 (2006): 81–87. http://dx.doi.org/10.2166/ws.2006.966.

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In this study a two-step strategy was adopted to cultivate Polyhydroxybutyrate (PHB)-rich aerobic granular sludge in a sequencing batch reactor (SBR) fed with a synthetic wastewater. In the first step both oxygen and ammonia were initially limited, in order to enhance the PHB-storage ability of sludge. In the second step granular sludge was cultivated to get a high PHB volumetric productivity. The PHB content of sludge increased to 43.1±2.0% in the first step. During the sludge granulation, the PHB content was constant at 40±4.6%. With the granulation, the settling ability of the PHB-rich slud

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3

Hermann-Krauss, Carmen, Martin Koller, Alexander Muhr, Hubert Fasl, Franz Stelzer, and Gerhart Braunegg. "Archaeal Production of Polyhydroxyalkanoate (PHA) Co- and Terpolyesters from Biodiesel Industry-Derived By-Products." Archaea 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/129268.

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The archaeonHaloferax mediterraneiwas selected for production of PHA co- and terpolyesters using inexpensive crude glycerol phase (CGP) from biodiesel production as carbon source. CGP was assessed by comparison with the application of pure glycerol. Applying pure glycerol, a copolyester with a molar fraction of 3-hydroxybutyrate (3HB) of 0.90 mol/mol and 3-hydroxyvalerate (3HV) of 0.10 mol/mol, was produced at a volumetric productivity of 0.12 g/Lh and an intracellular PHA content of 75.4 wt.-% in the sum of biomass protein plus PHA. Application of CGP resulted in the same polyester compositio

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4

Blunt, Warren, David Levin, and Nazim Cicek. "Bioreactor Operating Strategies for Improved Polyhydroxyalkanoate (PHA) Productivity." Polymers 10, no. 11 (2018): 1197. http://dx.doi.org/10.3390/polym10111197.

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Microbial polyhydroxyalkanoates (PHAs) are promising biodegradable polymers that may alleviate some of the environmental burden of petroleum-derived polymers. The requirements for carbon substrates and energy for bioreactor operations are major factors contributing to the high production costs and environmental impact of PHAs. Improving the process productivity is an important aspect of cost reduction, which has been attempted using a variety of fed-batch, continuous, and semi-continuous bioreactor systems, with variable results. The purpose of this review is to summarize the bioreactor operat

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5

Miranda, Diego A., Katherine Marín, Ola Sundman, et al. "Production and Characterization of Poly(3-hydroxybutyrate) from Halomonas boliviensis LC1 Cultivated in Hydrolysates of Quinoa Stalks." Fermentation 9, no. 6 (2023): 556. http://dx.doi.org/10.3390/fermentation9060556.

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The global production of fossil-based plastics has reached critical levels, and their substitution with bio-based polymers is an urgent requirement. Poly(3-hydroxybutyrate) (PHB) is a biopolymer that can be produced via microbial cultivation, but efficient microorganisms and low-cost substrates are required. Halomonas boliviensis LC1, a moderately halophilic bacterium, is an effective PHB producer, and hydrolysates of the residual stalks of quinoa (Chenopodium quinoa Willd.) can be considered a cheap source of sugars for microbial fermentation processes in quinoa-producing countries. In this s

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6

Blunt, Warren, Christopher Dartiailh, Richard Sparling, Daniel J. Gapes, David B. Levin, and Nazim Cicek. "Development of High Cell Density Cultivation Strategies for Improved Medium Chain Length Polyhydroxyalkanoate Productivity Using Pseudomonas putida LS46." Bioengineering 6, no. 4 (2019): 89. http://dx.doi.org/10.3390/bioengineering6040089.

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High cell density (HCD) fed-batch cultures are widely perceived as a requisite for high-productivity polyhydroxyalkanoate (PHA) cultivation processes. In this work, a reactive pulse feed strategy (based on real-time CO2 or dissolved oxygen (DO) measurements as feedback variables) was used to control an oxygen-limited fed-batch process for improved productivity of medium chain length (mcl-) PHAs synthesized by Pseudomonas putida LS46. Despite the onset of oxygen limitation half-way through the process (14 h post inoculation), 28.8 ± 3.9 g L−1 total biomass (with PHA content up to 61 ± 8% cell d

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7

Ruiz, Carolina, Shane T. Kenny, Ramesh Babu P, Meg Walsh, Tanja Narancic, and Kevin E. O’Connor. "High Cell Density Conversion of Hydrolysed Waste Cooking Oil Fatty Acids Into Medium Chain Length Polyhydroxyalkanoate Using Pseudomonas putida KT2440." Catalysts 9, no. 5 (2019): 468. http://dx.doi.org/10.3390/catal9050468.

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Waste cooking oil (WCO) is a major pollutant, primarily managed through incineration. The high cell density bioprocess developed here allows for better use of this valuable resource since it allows the conversion of WCO into biodegradable polymer polyhydroxyalkanoate (PHA). WCO was chemically hydrolysed to give rise to a mixture of fatty acids identical to the fatty acid composition of waste cooking oil. A feed strategy was developed to delay the stationary phase, and therefore achieve higher final biomass and biopolymer (PHA) productivity. In fed batch (pulse feeding) experiments Pseudomonas

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8

Gao, Ze-Liang, and You-Wei Cui. "Static Magnetic Field Increases Polyhydroxyalkanoates Biosynthesis in Haloferax mediterranei: Parameter Optimization and Mechanistic Insights from Metabolomics." Polymers 17, no. 9 (2025): 1190. https://doi.org/10.3390/polym17091190.

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Polyhydroxyalkanoates (PHAs), as biosynthetic and biodegradable polymers, serve as alternatives to petroleum-based plastics, yet face critical cost barriers in large-scale production. While magnetic field (MF) stimulation enhances microbial activity, the optimal MF parameters and metabolic mechanisms for PHA biosynthesis remain unexplored. This study optimized magnetic field parameters to increase PHA biosynthesis in Haloferax mediterranei. A custom-engineered electromagnetic system identified 110 mT of static magnetic field (SMF) as the optimal level for biosynthesis, reaching 77.97 mg/(L·h)

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9

Carvalho, João M., Bruno C. Marreiros, and Maria A. M. Reis. "Polyhydroxyalkanoates Production by Mixed Microbial Culture under High Salinity." Sustainability 14, no. 3 (2022): 1346. http://dx.doi.org/10.3390/su14031346.

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The fishing industry produces vast amounts of saline organic side streams that require adequate treatment and disposal. The bioconversion of saline resources into value-added products, such as biodegradable polyhydroxyalkanoates (PHAs), has not yet been fully explored. This study investigated PHA production by mixed microbial cultures under 30 gNaCl/L, the highest NaCl concentration reported for the acclimatization of a PHA-accumulating mixed microbial culture (MMC). The operational conditions used during the culture-selection stage resulted in an enriched PHA-accumulating culture dominated by

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10

Oehmen, Adrian, Fátima V. Pinto, Vera Silva, Maria G. E. Albuquerque, and Maria A. M. Reis. "The impact of pH control on the volumetric productivity of mixed culture PHA production from fermented molasses." Engineering in Life Sciences 14, no. 2 (2013): 143–52. http://dx.doi.org/10.1002/elsc.201200220.

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11

Koller, Martin, Denis Vadlja, Gerhart Braunegg, Aid Atlić, and Predrag Horvat. "Formal- and high-structured kinetic process modelling and footprint area analysis of binary imaged cells: Tools to understand and optimize multistage-continuous PHA biosynthesis." EuroBiotech Journal 1, no. 3 (2017): 203–11. http://dx.doi.org/10.24190/issn2564-615x/2017/03.01.

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Abstract Competitive polyhydroxyalkanoate (PHAs) production requires progress in microbial strain performance, feedstock selection, downstream processing, and more importantly according to the process design with process kinetics of the microbial growth phase and the phase of product formation. The multistage continuous production in a bioreactor cascade was described for the first time in a continuously operated, flexible five-stage bioreactor cascade that mimics the characteristics involved in the engineering process of tubular plug flow reactors. This process was developed and used for Cupr

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12

Barros, Kayo Santana, Mónica Carvalheira, Bruno Costa Marreiros, et al. "Donnan Dialysis for Recovering Ammonium from Fermentation Solutions Rich in Volatile Fatty Acids." Membranes 13, no. 3 (2023): 347. http://dx.doi.org/10.3390/membranes13030347.

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For the production of polyhydroxyalkanoates (PHA) using nitrogen-rich feedstocks (e.g., protein-rich resources), the typical strategy of restricting cell growth as a means to enhance overall PHA productivity by nitrogen limitation is not applicable. In this case, a possible alternative to remove the nitrogen excess (NH4+/NH3) is by applying membrane separation processes. In the present study, the use of Donnan dialysis to separate ammonium ions from volatile fatty acids present in the media for the production of PHA was evaluated. Synthetic and real feed solutions were used, applying NaCl and

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13

Chen, Si, You-Wei Cui, and Mei-Qi Huang. "Coupling Magnetic Field and Salinity Upshock To Improve Polyhydroxyalkanoate Productivity by Haloferax mediterranei Feeding on Molasses Wastewater." Applied and Environmental Microbiology, June 13, 2022. http://dx.doi.org/10.1128/aem.00305-22.

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The obstacle to replacing petroplastics with PHA is its high production cost. To increase the fermentation economy, a novel strategy of coupling a MF with salinity upshock was applied, which enhanced the PHA volumetric productivity of H. mediterranei in fermenting molasses wastewater.

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14

Bondar, Maryna, Filipa Pedro, M. Conceição Oliveira, M. Manuela R. da Fonseca, and M. Teresa Cesário. "Red algae industrial residues as a sustainable carbon platform for the co-production of poly-3-hydroxybutyrate and gluconic acid by Halomonas boliviensis." Frontiers in Bioengineering and Biotechnology 10 (October 10, 2022). http://dx.doi.org/10.3389/fbioe.2022.934432.

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Polyhydroxyalkanoate (PHA) production using halophilic bacteria has been revisited because less severe operational conditions with respect to sterility can be applied, also alleviating production costs. Halomonas boliviensis was selected because it is a moderate halophile able to grow and attain high poly-3-hydroxybutyrate (P3HB) contents under 5–45 g/L NaCl concentrations, conditions that discourage microbial contamination. Industrial residues of the red alga Gelidium corneum after agar extraction were used as sugar platform to reduce costs associated with the carbon source. These residues st

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15

Blunt, Warren, Alain Lagassé, Jacob Harvey, et al. "Semi‐continuous non‐sterile production of medium chain‐length polyhydroxyalkanoates from fatty acids." Canadian Journal of Chemical Engineering, May 9, 2024. http://dx.doi.org/10.1002/cjce.25299.

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AbstractMedium chain‐length polyhydroxyalkanoates (mcl‐PHAs) are efficiently synthesized from fatty acids. It was hypothesized that under non‐axenic conditions, the anti‐microbial properties of fatty acids would reduce growth of microbial competitors and allow Pseudomonas putida LS46 to dominate the population resulting in non‐sterile mcl‐PHA production. Non‐sterile batch and fed‐batch cultures produced similar final mcl‐PHA content, monomer composition, and productivity during 24–27 h cultivations when compared to sterile control cultures for initial octanoic acid concentrations ranging from

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16

Borrero-de Acuña, José Manuel, Manfred Rohde, Cesar Saldias та Ignacio Poblete-Castro. "Fed-Batch mcl- Polyhydroxyalkanoates Production in Pseudomonas putida KT2440 and ΔphaZ Mutant on Biodiesel-Derived Crude Glycerol". Frontiers in Bioengineering and Biotechnology 9 (16 березня 2021). http://dx.doi.org/10.3389/fbioe.2021.642023.

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Crude glycerol has emerged as a suitable feedstock for the biotechnological production of various industrial chemicals given its high surplus catalyzed by the biodiesel industry. Pseudomonas bacteria metabolize the polyol into several biopolymers, including alginate and medium-chain-length poly(3-hydroxyalkanoates) (mcl-PHAs). Although P. putida is a suited platform to derive these polyoxoesters from crude glycerol, the attained concentrations in batch and fed-batch cultures are still low. In this study, we employed P. putida KT2440 and the hyper-PHA producer ΔphaZ mutant in two different fed-

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17

Simões, Ana Cristina Pantoja, Rodrigo Pimentel Fernandes, Maysa Silva Barreto, et al. "Growth of Methylobacterium organophilum in Methanol Aiming at the Simultaneous Production of Single-Cell Protein and Metabolites of Interest." Food Technology and Biotechnology 60, no. 3 (2022). http://dx.doi.org/10.17113/ftb.60.03.22.7372.

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Research background. This study aimed to monitor the growth of the methylotrophic bacteria Methylobacterium organophilum in a culture medium with methanol as a carbon source and to verify the production of unicellular proteins and other biomolecules, such as carotenoids, exopolysaccharides and polyhydroxyalkanoates, making a compound more attractive as food intended for animal feed. Experimental approach. Microbial growth was studied in shaken flasks to evaluate bacterial growth with different carbon: nitrogen ratios (C: N) and determine the best results in terms of cell volumetric productivit

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