Improved production of poly(3-hydroxybutyrate) by extremely halophilic archaeon Haloarcula sp. TG1 by utilization of rCKT3eng-treated sugar beet pulp

Polyhydroxyalkanoates (PHAs) are leading “green” alternatives for the production of biodegradable plastics. They accumulate inside archaea and bacteria as the sources of carbon and energy under stress conditions. This study evaluates the biosynthesis of poly(3-hydroxybutyrate) (PHB), one of the majo...

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Bibliographic Details
Published in:Biomass conversion and biorefinery 2023-08, Vol.13 (12), p.10911-10921
Main Authors: Kurt-Kızıldoğan, Aslıhan, Türe, Eylem, Okay, Sezer, Otur, Çiğdem
Format: Article
Language:English
Subjects:
Agricultural wastes
Archaea
Biomass
Bioplastics
Biosynthesis
Biotechnology
Carbon
Energy
Glucose
Optimization
Original Article
Polyhydroxyalkanoates
Polyhydroxybutyrate
Renewable and Green Energy
Sugar beets
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Summary:Polyhydroxyalkanoates (PHAs) are leading “green” alternatives for the production of biodegradable plastics. They accumulate inside archaea and bacteria as the sources of carbon and energy under stress conditions. This study evaluates the biosynthesis of poly(3-hydroxybutyrate) (PHB), one of the major PHAs, in the extremely halophilic archaeon Haloarcula sp. TG1 by microscopic, spectroscopic, and thermal analyses. The PHB production by TG1 strain was optimized in terms of growth conditions and media. The optimum PHB content (34.6% of the biomass) was obtained in Mineral Salt Medium (MSM) cultures containing 5 M NaCl and 4% glucose, at pH 7.35, incubated for 72 h at 37 °C. Replacement of glucose with starch or glycerol lowered the PHB content in biomass. Alternatively, agricultural wastes (sugar beet pulp, corn cob, and hazelnut husk) were used as cheap carbon sources. The highest PHB content (45.6% of the biomass) was obtained using sugar beet pulp treated with recombinant endoglucanase (rCKT3eng), while PHB amount was 17.8% of the biomass with chemically hydrolyzed sugar beet pulp. In conclusion, PHB production by Haloarcula sp. TG1 was shown to be promising biotechnologically, using a low-cost fermentation medium at optimal culture conditions.
ISSN:2190-6815
2190-6823
DOI:10.1007/s13399-021-02011-w