Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8087062 | Algal Research | 2016 | 6 Pages |
Abstract
The microalgae Scenedesmus quadricauda were treated by ultrasound (200Â W, 40Â kHz) at the end of the logarithmic phase to investigate the effects on stimulating lipid accumulation. Firstly, the microalgae were treated by ultrasound for different times of 0, 5, 10, 15, 20 and 40Â min, and then cultivated for 2Â days. Although the biomass concentration did not increase, the maximum lipid content of 37.8% dry weight (DW), showing a significant improvement of 57.5%, was obtained after ultrasonic exposure for 20Â min. Secondly, the cultivation of the microalgae at the end of the logarithmic phase was continued for a different number of days (1, 2, 3, 4, 5 and 6) after ultrasonic stimulation for 20Â min to check the variation of biomass, lipid and other compositions accumulation. The results indicated that a maximum lipid content of 38.9% DW was obtained on day 2, showing an excellent performance. The improved fatty acid in microalgae cells was also analyzed after ultrasonic treatment. This study efficiently increased the accumulated lipid of microalgae by ultrasonic treatment at the end of the logarithmic growth phase without decreasing the biomass, which might be a useful method in practice.
Keywords
Related Topics
Physical Sciences and Engineering
Energy
Renewable Energy, Sustainability and the Environment
Authors
Fei Han, Haiyan Pei, Wenrong Hu, Shuo Zhang, Lin Han, Guixia Ma,