Journal
BIORESOURCE TECHNOLOGY
Volume 263, Issue -, Pages 555-561Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.05.046
Keywords
Microalgae; Mixotrophy; Nitrogen limitation; Chlorophyll fluorescence; Cell components
Funding
- National Natural Science Foundation of China [51208533, 51478062]
- Major project of Natural Foundation of Chongqing [cstc2015jcyjBX0111]
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In this study, the effect of nitrogen limitation on microalgal growth, biochemical composition and photosynthetic performance was investigated in fed-batch mixotrophic cultivation of microalga Spirulina platensis, compared with that in autotrophic cultivation. The microalgal biomass productivity was greatly enhanced by mixotrophic cultivation. With nitrogen limitation, the mixotrophic culture accelerated the degradation of microalgal pigments and proteins to supply intracellular nitrogen for maintaining higher biomass productivity, simultaneously accumulating more carbohydrates. The mixotrophic cultivation amplified the adverse effect of nitrogen limitation on the microalgal photosynthetic performance in comparison with autotrophic cultivation. This fed-batch mixotrophic cultivation is an effective strategy for enhancing biomass productivity and total carbohydrates yield under nitrogen limited conditions.
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