Producción de polihidroxibutirato a partir de la fermentación de suero de leche por Bacillus megaterium TRQ8
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Abstract
Plastics derived from oil represent a major environmental problem, due to their long period of degradation, high emissions of CO2 and consumption of non-renewable resources. Thus, it is necessary to generate sustainable alternatives to produce natural polymers, such as polyhydroxybutyrate (PHB), a biopolymer produced from the fermentation of agro-industrial wastes by some microorganisms.
The aim of this work was to analyze the optimum culture medium composition and culture conditions to improve the yield of PHB production in Bacillus megaterium TRQ8. Milk whey was used as the carbon source and the fermentation was performed inside a bioreactor under controlled conditions. In order to achieve this purpose an initial conditioning pretreatment to remove the nutrients from the whey was implemented, afterwards, the fermentation and extraction of PHB were carried out; furthermore, different culture media containing ethanol and sodium acetate at different concentrations were tested to enhance the synthesis of PHB. As a result of the tests performed it was concluded that the medium with ethanol 1% v/v was the one that increased significantly the PHB production.
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