Abstract
In the present study, three conditions of photoautotrophic (Case 1), heterotrophic (Case 2), and mixotrophic (Case 3) on the microalgal growth, lipid accumulation, and content of chlorophyll a and phycocyanin pigment in Anabaena vaginicola ISC90 have been investigated. Results shown that the specific growth rate (µmax) of case 1 compared to cases 2 and 3, had an increase of 30% and 26%, respectively. Additionally, the productivity rate (P) of case 3 in comparison with cases 1 and 2 grew by 30% and 92%, sequentially. Lipid and chlorophyll a content in case 3 were found to be significantly higher than other cases at the end of cultivation time. Also, during the first week phycocyanin pigment content in case 2 reached a massive increase compared to other cultures. In spite of the low rate of growth parameters in heterotrophic condition, this culture was found to be a great potential for phycocyanin pigment content production. Also, three kinetic growth models (Logistic, Gompertz and Richards) were evaluated, among which Gompertz showed the best fit for all conditions.
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