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CO2 fixation and lipid production by microalgal species
Srinivasa Reddy Ronda,Pavani Parupudi,Chandrika Kethineni,Pradip Babanrao Dhamole,Sandeep Vemula,Prasada Rao Allu,Mahendran Botlagunta,Sujana Kokilagadda 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.2
Microalgal species Nannochloropsis limnetica, Botryococcus braunii, and Stichococcus bacillaris were compared for their ability to grow, remove CO2, and accumulate lipids in their biomass under CO2-enriched atmosphere. Overall, N. limnetica outperformed the other two cultures and distinctly exhibited higher specific growth rate (0.999 d−1) and CO2 fixation rate (0.129 gL−1 d−1) with a high specific lipid yield (40% w/w). The volumetric CO2 fixation rate for all three species was validated with biomass productivity and mass transfer methods (P<0.005 and R2=0. 98). At 10% CO2, N. limnetica showed one-and-a-half times more carbon fixation efficiency over B. braunii, and S. bacillaris. On the other hand, total fatty acids of N. limnetica dispalyed an apparent increase in oleic acid. Whereas, under similar conditions, N. limnetica exhibited reduced eicosapentaenoic acid. These findings suggest that at high CO2 conditions, N. limnetica proved to be an efficient CO2 capture algal system and can be considered for biofuel applications.
Srinivasa Reddy Ronda,Pavani Lakhsmi Chandrika Parupudi,Sandeep Vemula,Santhosh Tumma,Mahendran Botlagunta,Vijaya Saradhi Settaluri,Smita Lele,Suraj Sharma,Chari Kandala 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.10
This work describes the medium optimization of γ-Linolenic acid (GLA) production by Spirulina platensisusing one-factor and orthogonal array design methods. In the one-factor experiments, NaHCO3 (9 mg L−1), NaNO3(13.5 mg L−1) and MgSO4·7H2O (11.85 mg L−1) proved to be the best components for GLA production. The optimalpH for GLA production by the alga was 9.2. Based on the delta values, NaHCO3 showed the greatest effect on the GLAproduction of the various factors tested, followed in decreasing order by MgSO4·7H2O, NaNO3 and K2SO4. The max-imum GLA yield obtained was 19.2 mgL−1in the presence of optimum concentrations of NaHCO3 (20 g L−1), NaNO3(3 g L−1), MgSO4·7H2O (0.5 g L−1) and K2SO4 (1.5 g L−1). Because of the slow growth rate of the algae, the practiceof robust orthogonal array methods during the optimization of medium components can result in the production of anoptimal biomass and a higher GLA yield for nutraceutical applications.