Effects of carbon and nitrogen sources on fatty acid contents and composition in the green microalga, Chlorella sp. 227.
In order to investigate and generalize the effects of carbon and nitrogen sources on the growth of and lipid production in Chlorella sp. 227, several nutritional combinations consisting of different carbon and nitrogen sources and concentrations were given to the media for cultivation of Chlorella sp. 227, respectively. The growth rate and lipid content were affected largely by concentration rather than by sources. The maximum specific growth was negatively affected by low concentrations of carbon and nitrogen. There is a maximum allowable inorganic carbon concentration (less than 500~1,000 mM bicarbonate) in autotrophic culture, but the maximum lipid content per gram dry cell weight (g DCW) was little affected by the concentration of inorganic carbon within the concentration. The lipid content per g DCW was increased when the microalga was cultured with the addition of glucose and bicarbonate (mixotrophic) at a fixed nitrogen concentration and with the lowest nitrogen concentration (0.2 mM), relatively. Considering that lipid contents per g DCW increased in those conditions, it suggests that a high ratio of carbon to nitrogen in culture media promotes lipid accumulation in the cells. Interestingly, a significant increase of the oleic acid amount to total fatty acids was observed in those conditions. These results showed the possibility to induce lipid production of high quality and content per g DCW by modifying the cultivation conditions.
Department of Civil and Environmental Engineering, Pusan National University, Busan 609-735, Korea.
Sunja
S
Cho
Dukhaeng
D
Lee
Thao Thanh
TT
Luong
Sora
S
Park
You-Kwan
YK
Oh
Taeho
T
Lee
D002244:Carbon / Q000378:metabolism*; D002708:Chlorella / Q000254:growth & development / Q000378:metabolism*; D003470:Culture Media / Q000378:metabolism; D005227:Fatty Acids / Q000378:metabolism*; D005285:Fermentation; D005947:Glucose / Q000378:metabolism; D058086:Microalgae / Q000254:growth & development / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism*
D003470:Culture Media; D005227:Fatty Acids; D002244:Carbon; D005947:Glucose; D009584:Nitrogen