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High lipid content and productivity of microalgae cultivating under elevated carbon dioxide

  • Y-T Huang
  • C-P Su
Original Paper

Abstract

This study examined the cell growth rate, lipid contents, lipid productivity, chlorophyll a concentration, and carbon dioxide tolerance of Chlorella vulgaris under various cultivation conditions. The pH, concentration of carbon dioxide in media, and light intensity variables were manipulated to obtain high lipid productivity. The optimum conditions were at pH 7.0, 2,930 lux, and 30 % carbon dioxide. Biomass concentration reached 1,288, 1,130, and 1,083 mg L−1 at 15, 30, and 50 % CO2 after 6 days, respectively, implying that this strain has appreciable tolerance to carbon dioxide. The highest concentration of chlorophyll a occurred at 2,930 lux and decreased with increasing light intensity gradually. The maximum specific growth rate was 3.25 day−1 based on the dry weight and 4.63 day−1 based on the cell number. The lipid content (45.68 %) and lipid productivity (86.03 mg day−1 L−1) obtained in this study are higher than reported values in literatures. Hence, C. vulgaris is a good candidate for subsequent research in biodiesel production under elevated carbon dioxide concentration by microalgae.

Keywords

Biodiesel Chlorella Global warming Light intensity 

Notes

Acknowledgments

The authors would like to express their utmost respect to Emeritus Professor Shih-Yow Huang, Department of Chemical Engineering, National Taiwan University, for his critical review and valuable suggestions regarding this article. This research was supported by the National Science Council, Taiwan (NSC101-2623-E-033-001-ET).

Supplementary material

13762_2013_251_MOESM1_ESM.doc (97 kb)
Supplementary material 1 (DOC 97 kb)

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Copyright information

© Islamic Azad University (IAU) 2013

Authors and Affiliations

  1. 1.Department of Bioenvironmental EngineeringChung Yuan Christian UniversityChung-LiTaiwan

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