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Karmann, Stephanie; Panke, Sven; Zinn, Manfred
Frontiers in bioengineering and biotechnology, 04/2019, Letnik: 7Journal Article
Syngas from gasified organic waste materials is a promising feedstock for the biotechnological synthesis of the bioplastic poly( -3-hydroxybutyrate) (PHB) with . In a first approach, growth studies were carried out with this strain in gas-tight serum vials. When syngas (40% CO, 40% H , 10% CO , and 10% N v/v) was diluted with N to 60%, a 4-fold higher biomass production was detected compared to samples grown on 100% syngas, thus indicating a growth inhibitory effect. The best performing syngas-mixture was then used for C-, C,N-, and C,P-limited fed-batch fermentations in a bioreactor with continuous syngas and acetate supply. It was found that C,P-limited PHB productivity was 5 times higher than for only C-limited growth and reached a maximal PHB content of 30% w/w. Surprisingly, growth and PHB production stopped when N, as a second nutrient, became growth-limiting. Finally, it was concluded that a minimal supply of 0.2 g CO g biomass h has to be guaranteed in order to cover the cellular maintenance energy.
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