期刊
BIORESOURCE TECHNOLOGY
卷 102, 期 12, 页码 6710-6716出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.04.006
关键词
Lipid biofuel; Isochrysis zhangjiangensis; Nitrate-repletion; Marine microalgae
资金
- Dalian Institute of Chemical Physics of China 973 Program [2011CB200902]
- National Key Basic Research Program of China 973 Program [2009CB220004]
- National Natural Science Foundation of China [20806081]
- Chinese Academy of Sciences [KSCX2-YW-G-073, KSCX2-YW-373-2, KGCX2-YW-223, KSCX2-YW-G-002]
- Natural Science Foundation of Liaoning Province [20082152]
Effects of nitrate feeding on the cell growth and lipid accumulation of marine microalgae Isochrysis zhangjiangensis were investigated. When nitrate was supplied at interval of 24 h, instead of 72 h, a high lipid content of 40.9% and a biomass density of 3.1 g L-1 were obtained. To confirm whether 1. zhangjiangensis accumulates lipid during nitrogen-repletion, a two-stage cultivation method was applied. This algal strain had a high lipid content during sustained nitrate addition and showed a high carbohydrate content under nitrate-depletion conditions. These results revealed that this algal strain can accumulate lipids under nitrogen-repletion conditions and accumulate carbohydrate under nitrogen-depletion conditions. When cultured in an extremely high nitrate concentration, 9 g L-1 at 24 h intervals, the growth of algal cells was suppressed, but the highest lipid content of 53% was attained. This special characteristic of lipid accumulation makes I. zhangjiangensis an ideal candidate for producing biodiesel using N-rich wastewater. (C) 2011 Elsevier Ltd. All rights reserved.
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