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Int J Biol Macromol ; 186: 574-579, 2021 Sep 01.
Article in English | MEDLINE | ID: mdl-34245739

ABSTRACT

A moderately halophilic bacterium isolated from the water samples collected from a salt field, Salinivibrio sp. TGB10 was found capable of producing poly-3-hydroxybutytate (PHB) from various sugars. Cell dry weight (CDW) of 8.82 g/L and PHB titer of 6.84 g/L were obtained using glucose as the carbon source after 24 h of cultivation in shake flasks. Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) was synthesized when propionate was provided as secondary carbon source. Salinivibrio sp. TGB10 exhibited favorable tolerance to propionate. The use of 8 g/L propionate and 20 g/L glucose as combinational substrates yielded 1.45 g/L PHBV with a 3-hydroxyvalerate monomer content of 72.02 mol% in flask cultures. In bioreactor study, CDW of 33.45 g/L and PHBV titer of 27.36 g/L were obtained after 108 h of fed-batch cultivation. The results indicated that Salinivibrio sp. TGB10 is a promising halophilic bacterium for the production of PHBV with various polymer compositions.


Subject(s)
Hydroxybutyrates/metabolism , Polyesters/metabolism , Polyhydroxyalkanoates/metabolism , Vibrionaceae/enzymology , Bioreactors , Fatty Acids, Volatile/metabolism , Fermentation , Substrate Specificity , Sugars/metabolism , Vibrionaceae/growth & development , Water Microbiology
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