Enhancement of acid resistance of Scenedesmus dimorphus by acid adaptation |
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Authors: | Yinli Jiang Xiaowei Peng Wei Zhang Tianzhong Liu |
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Institution: | 1. Shandong Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China
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Abstract: | When using flue gas as carbon source for microalgae cultivation, the resulting acidic environment caused by SO X and NO X can inhibit microalgal growth. In this study, Scenedesmus dimorphus acquired increased acid resistance by prior exposure to sublethal acid stress; a process defined as acid adaptation. Among the five algal species tested, S. dimorphus showed the highest level of acid tolerance to extreme acid challenge (exposure to pH 3.0). Non-adapted and acid-adapted exponential algal cells were used as inocula for tubular photobioreactors aerated with 2 % CO2. Previously adapted at pH 4.0 for 1 h, S. dimorphus developed highest growth rate under extreme acidic condition, and the maximum biomass concentration and specific growth rate at pH 3.0 (3.638?±?0.074 g?L?1 and 1.037?±?0.008 d?1, respectively) were respectively 14.22 and 10.79 % higher than those of non-adapted cells. Moreover, acid-adapted cells could tolerate lower pH of 2.5, at which the growth of non-adapted cells was totally inhibited. All the results indicated that acid adaptation was an effective approach for the acid resistance enhancement of microalgae. |
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