Production of polyhydroxybutyrates and carbohydrates in a mixed cyanobacterial culture : effect of nutrients limitation and photoperiods
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European Commission's projectINCOVER - Innovative Eco-Technologies for Resource Recovery from Wastewater (EC-H2020-689242)
In the present study, different photoperiods and nutritional conditions were applied to a mixed wastewater-borne cyanobacterial culture in order to enhance the intracellular accumulation of polyhydroxybutyrates (PHBs) and carbohydrates. Two different experimental set-ups were used. In the first, the culture was permanently exposed to illumination, while in the second, it was submitted to light/dark alternation (12h cycles). In both cases, two different nutritional regimes were also evaluated, N-limitation and P-limitation. Results showed that the highest PHB concentration (104 mg L-1) was achieved under P limited conditions and permanent illumination, whereas the highest carbohydrate concentration (838 mg L-1) was obtained under N limited condition and light/dark alternation. With regard to bioplastics and biofuel generation, this study demonstrates that the accumulation of PHBs (bioplastics) and carbohydrates (potential biofuel substrate) is favored in wastewater-borne cyanobacteria under conditions where nutrients are limited.
CitationArias , D.M., Uggetti, E., Garcia, M., Garcia, J. Production of polyhydroxybutyrates and carbohydrates in a mixed cyanobacterial culture : effect of nutrients limitation and photoperiods. "New biotechnology", 25 Maig 2018, vol. 42, p. 1-11.
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