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The effects of light and temperature conditions on the growth and productions accumulation of Chlorella sp.
Pages: 1527-1533
Year: Issue:  10
Journal: Rural Energy

Keyword:  Chlorella sp.growthproduct accumulationcomponentfatty acid;
Abstract: In the masses of biomasses, microalgae have the advantages of productions accumulation of high lipid, large biomass, short growth cycle and easy cultivation and with microalgae as the raw material. Light and temperature conditions are crucial to cultivation of microalgae. In this paper, the microalgae strain of Chlorella sp. was cultured in BG11 medium, and cultivation optimization studies were experimented with different light intensities,illumination time and temperatures.The effects of light intensity,illumination time and temperature on the growth rate,biomass,and lipid accumulation of Chlorella aerated cultures were investigated.The results showed that the growth rate and production accumulation were significantly different(p<0.05) under five different levels of light intensity, but the biomass in stationary phase was significantly different.Accumulation of protein and fatty acid contents in the cells of Chlorella sp. decreased with the increase of light intensity, but sugars on the contrary. There was significant influence on sugar accumulation of Chlorella sp. under different illumination time(p<0.05), but there was no significant influence on fatty acid accumulation of chlorella. Illumination time could influence accumulation and content of fatty acids in the cell. Temperature significantly impacted growth rate,biomass,lipid content and lipid production.Accumulation of unsaturated fatty acid was highest in the cell under the temperature of 25 ℃. Therefore, in the process of algae culture, the harvest of target products can be acquired by controlling the light and temperature.
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