A comparative evaluation of different cell disruption methods for the release of lipids from marine Chlorella vulgaris cells was investigated. The cell growth of C. vulgaris was observed. Lipid concentrations from different disruption methods were determined, and the fatty acid composition of the extracted lipids was analyzed. The results showed that average productivity of C. vulgaris biomass was 208 mg L−1 day−1. The lipid concentrations of C. vulgaris were 5%, 6%, 29%, 15%, 10%, 7%, 22%, 24%, and 18% when using grinding with quartz sand under wet condition, grinding with quartz sand under dehydrated condition, grinding in liquid nitrogen, ultrasonication, bead milling, enzymatic lysis by snailase, enzymatic lysis by lysozyme, enzymatic lysis by cellulose, and microwaves, respectively. The shortest disruption time was 2 min by grinding in liquid nitrogen. The unsaturated and saturated fatty acid contents of C. vulgaris were 71.76% and 28.24%, respectively. The extracted lipids displayed a suitable fatty acid profile for biodiesel [C16:0 (~23%), C16:1 (~23%), and C18:1 (~45%)]. Overall, grinding in liquid nitrogen was identified as the most effective method in terms of disruption efficiency and time.
Microalga Lipid concentration Cell disruption
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The authors would like to thank Prof. Walter K. Johnson from Brigham Young University for the assistance in polishing the English language of this study. This work was funded by the Key Program of National Natural Science Foundation of China (no. 20936002), the National Basic Research Program of China (nos. 2007CB707805, 2009CB724700, and 2011CB200906), the Fifth of Six Projects Sponsoring Talent Summits of Jiangsu Province (no. 2008-D-63), the College Industrialization Project of Jiangsu Province (no. JH09-30), the Fok Ying Tung Education Foundation (no. 123014), and the Program for New Century Excellent Talents in University from the Ministry of Education of China (no. NCET-09-0157).