Hao Hu1,2, Lin-Lin Ma1,3, Xiao-Fei Shen1,3, Jia-Yun Li4, Hou-Feng Wang1, Raymond Jianxiong Zeng5,6. 1. CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei, 230026, People's Republic of China. 2. Anhui Water Conservancy College, Hefei, 231603, People's Republic of China. 3. Advanced Laboratory for Environmental Research and Technology, USTC-CityU, Suzhou, 215123, People's Republic of China. 4. The First Affiliated Hospital of Anhui University of Traditional Chinese Medicine, Hefei, 230031, People's Republic of China. 5. CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei, 230026, People's Republic of China. rzeng@ustc.edu.cn. 6. Advanced Laboratory for Environmental Research and Technology, USTC-CityU, Suzhou, 215123, People's Republic of China. rzeng@ustc.edu.cn.
Abstract
In this study, Tisochrysis lutea was cultivated in mixotrophic and heterotrophic cultures with glycerol as a carbon source and with glucose and acetate for comparison; autotrophic cultivation was the control group without a carbon source. It was found that T. lutea used glycerol and did not use glucose and acetate under mixotrophy. Mixotrophy slightly elevated the docosahexaenoic acid (DHA) and total fatty acids (TFA) content in the dry-weight and enhanced the DHA and TFA production in medium (41.3 and 31.9% respectively) at the end of a 16-day cultivation, while heterotrophy reduced the DHA content and TFA production. Under the mixotrophy, the glycerol contribution to the DHA production (16.19 mg/L) and the TFA production (97.8 mg/L) was not very high and the DHA yield [2.63% chemical oxygen demand (COD)] and TFA yield (13.1% COD) were also very low. Furthermore, T. lutea using glycerol had a period of adaptation, indicating that T. lutea was not an ideal microalga for organic carbon utilization.
In this study, n class="Species">Tisochrysis lutea was cultivated inclass="Chemical">pan> mixotrophic and heterotrophic cultures with glycerol as a carbon source and with n class="Chemical">glucose and acetate for comparison; autotrophic cultivation was the control group without a carbon source. It was found that T. lutea used glycerol and did not use glucose and acetate under mixotrophy. Mixotrophy slightly elevated the docosahexaenoic acid (DHA) and totalfatty acids (TFA) content in the dry-weight and enhanced the DHA and TFA production in medium (41.3 and 31.9% respectively) at the end of a 16-day cultivation, while heterotrophy reduced the DHA content and TFA production. Under the mixotrophy, the glycerol contribution to the DHA production (16.19 mg/L) and the TFA production (97.8 mg/L) was not very high and the DHA yield [2.63% chemical oxygen demand (COD)] and TFA yield (13.1% COD) were also very low. Furthermore, T. lutea using glycerol had a period of adaptation, indicating that T. lutea was not an ideal microalga for organic carbon utilization.
Authors: Prabuddha L Gupta; Hee-Jeong Choi; Radheshyam R Pawar; Sokhee P Jung; Seung-Mok Lee Journal: J Environ Manage Date: 2016-10-24 Impact factor: 6.789