The influence of different flocculants on the physiological activity and fucoxanthin production of Phaeodactylum tricornutum |
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| Institution: | 1. Shandong Provincial Key Laboratory of Restoration for Marine Ecology, Shandong Marine Resource and Environment Research Institute, Yantai 264006, PR China;2. College of Fisheries and Life, Shanghai Ocean University, 201306 Shanghai, PR China;1. Key Laboratory of Mariculture, Ocean University of China, Ministry of Education, Qingdao 266003, China;2. Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266100, China;3. College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China;1. Department of Physics and Earth Sciences, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany;2. Department of Life Science and Chemistry, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany;3. Phytolutions GmbH, Campus Ring 1, 28759 Bremen, Germany;1. Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes, College of Life Science and Technology, Jinan University, Guangzhou 510632, China;2. Department of Biotechnology, Bharathidasan University, Tiruchirappalli 620024, India |
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| Abstract: | Phaeodactylum tricornutum is an economically important species of microalgae that is widely used in aquaculture, and it is rich in bioactive substances including eicosapentaenoic acid and fucoxanthin. The major bottleneck for industrialization of this species is harvesting. Flocculation is used to harvest microalgae, thus the selection of flocculants is of great importance. In this study, we compared the flocculation effect of four different chemicals (ferric chloride, aluminum sulphate, polyaluminum chloride, and aluminum potassium sulphate) on P. tricornutum. Microexamination showed that ferric and aluminum salts had similar flocculation effects on the algae. Growth and chlorophyll fluorescence measurements showed that P. tricornutum can be re-cultured after flocculation. Pigment analysis showed that flocculation did not result in degradation of fucoxanthin, which suggests that the four flocculants tested may be useful for industrial applications. The results also showed that ferric chloride was the best flocculant for harvesting P. tricornutum when the target product was fucoxanthin, as it had the least influence on the physiological activity of P. tricornutum and it did not lead to degradation of cell components. In contrast, aluminum is poisonous to the nervous system of animals and humans. In addition, the culture medium can be recycled after flocculation by ferric chloride. |
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| Keywords: | Ferric chloride Fucoxanthin Flocculation Microalgae harvest |
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