Comparative kinetic modeling of growth and molecular hydrogen overproduction by engineered strains of Thermotoga maritima

2019 
Abstract Thermotoga maritima is an anaerobic hyperthermophilic bacterium known for its high amounts of hydrogen (H 2 ) production. In the current study, the kinetic modeling was applied on the engineered strains of T. maritima that surpassed the natural H 2 production limit. The study generated a kinetic model explaining H 2 overproduction and predicted a continuous fermentation system. A Leudking-Piret equation-based model predicted that H 2 production by Tma200 (0.217 mol-H 2  g −1 -biomass) and Tma100 (0.147 mol-H 2  g −1 -biomass) were higher than wild type (0.096 mol-H 2  g −1 -biomass) with reduced rates of maltose utilization. Sensitivity analysis confirmed satisfactory fitting of the experimental data. The slow growth rates of Tma200 (0.550 h −1 ) and Tma100 (0.495 h −1 ) are compared with the wild type (0.663 h −1 ). A higher maintenance energy along with growth and non-growth H 2 coefficients corroborate the higher H 2 productivity of the engineered strains. The modeled data established a continuous fermentation system for the sustainable H 2 production.
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