Elucidating the role of nutrients in C-phycocyanin production by the halophilic cyanobacterium Euhalothece sp.
In this study, a novel halophilic cyanobacterium was isolated and identified as Euhalothece sp. KZN. This fast-growing strain had the ability to synthesise high yields (12 mg g−1) of C-phycocyanin (C-PC), a highly fluorescent blue light-harvesting pigment with numerous potential uses in the biotechnology and commercial sectors. This study elucidated the individual and interactive role of different nutrients in BG11 growth medium for enhancing C-PC production in Euhalothece sp. KZN. Nine components of BG11 medium were screened for their effects via fractional factorial design (FFD). The results revealed a significant influence of nutrients, viz. MgSO4, NaNO3 and minor nutrients (citric acid, EDTA-iron citrate, CaCl2 and Na2CO3) on C-PC yield. These three components were further explored for their optimum concentration for enhancing C-PC production using a central composite design. The optimum values for these essential nutrients were found to be as follows: 0.10 g L−1 of MgSO4, 1.67 g L−1 of NaNO3 and 10 mL L−1 of minor nutrients which resulted in a 280% increase in C-PC yield with predicted and actual values of 43.97 and 45 mg g−1, respectively. Euhalothece sp. KZN is a strong potential candidate for C-PC production and can be further exploited to produce this industrially valuable compound.
KeywordsEuhalothece sp. Cyanobacteria C-phycocyanin Pigment Nutrients Design of experiments
We thank our colleagues at the Institute for Water and Wastewater Technology (IWWT), Durban University of Technology (DUT), for their support and guidance.
This work was supported by the grant from the National Research Foundation, for which the authors are thankful.
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