期刊
BIOMASS & BIOENERGY
卷 75, 期 -, 页码 170-179出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.biombioe.2015.02.016
关键词
Chlorella vulgaris; Chlorella growth factor; Phytohormones; Carbon sources; Biomass; Lipid
资金
- Ministry of Earth Sciences and Council of Scientific and Industrial Research, Govt. of India [173]
The key challenges in lipid production from marine microalgae include the selection of appropriate strain, optimization of the culture conditions and enhancement of biolipid yield. This study is aimed at evaluating the optimal harvest time and effect of chlorella growth factor (CGF) extract, carbon sources and phytohormones on the biomass and lipid production in Chlorella vulgaris. CGF, extracted using hot water from Chlorella has been reported to possess various medicinal properties. However, in the present study, for the first time in C. vulgaris, CGF was found as a best growth stimulator by enhancing the biomass level (1.208 kg m(-3)) significantly on day 5. Gibberellin and citrate augmented the biomass by 0.935 kg m(-3) and 1.025 kg m(-3). Combination of CGF and phytohormones were more effective than CGF and carbon sources. Analysis of fatty acid methyl esters indicated that the ratio of saturated to unsaturated fatty acids is higher in cytokinin, abscisic acid and CGF, and are also rich in short chain carbon atoms, ideal criteria for biodiesel. Nitrogen starvation favoured synthesis of more unsaturated fatty acids than saturated. This study shows that CGF enhances the biomass and lipid significantly and thus can be used for large scale biomass production. (C) 2015 Elsevier Ltd. All rights reserved.
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