Influence of nitrogen on growth, biomass composition, production, and properties of polyhydroxyalkanoates (PHAs) by microalgae

International Journal of Biological Macromolecules
Samantha Serra CostaJanice Izabel Druzian

Abstract

This study sought to evaluate influence of nitrogen availability on cell growth, biomass composition, production, and the properties of polyhydroxyalkanoates during cultivation of microalgae Chlorella minutissima, Synechococcus subsalsus, and Spirulina sp. LEB-18. The cellular growth of microalgae reduced with the use of limited nitrogen medium, demonstrating that nitrogen deficiency interferes with the metabolism of microorganisms and the production of biomass. The biochemical composition of microalgae was also altered, which was most notable in the degradation of proteins and chlorophylls and the accumulation of carbonaceous storage molecules such as lipids and polyhydroxyalkanoates. Chlorella minutissima did not produce these polymers even in a nitrogen deficient environment. The largest accumulations of the polyhydroxyalkanoates occurred after a 15 days culture, with a concentration of 16% (dry cell weight) produced by the Synechococcus subsalsus strain and 12% by Spirulina sp. LEB-18. Polyhydroxyalkanoates produced by Synechococcus subsalsus and Spirulina sp. LEB-18 presented different thermal and physical properties, indicating the influence of producing strain on polyhydroxyalkanoates properties. The polymers obtained co...Continue Reading

Citations

Dec 15, 2020·The Science of the Total Environment·Ayesha Algade AmaduSufeng Wang
Mar 3, 2021·Bioresource Technology·Ehsan DaneshvarAmit Bhatnagar
Mar 13, 2021·Bioresource Technology·Ashokkumar KartikArivalagan Pugazhendhi
May 31, 2021·Journal of Environmental Management·Jun Wei Roy ChongPau Loke Show
Aug 27, 2021·Marine Drugs·Rozita MadadiSónia P M Ventura

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