Growth and lipid accumulation properties of a freshwater microalga Scenedesmus sp. under different cultivation temperature

摘要

Microalgal lipid is a promising feedstock for biodiesel production. Effect of cultivation temperature on the growth and lipid accumulation properties of a freshwater microalga Scenedesmus sp. LX1 was studied. Scenedesmus sp. LX1 could grow in a wide range of temperature (10～30°C), and the growth activation energy was 49.3kJ·mol-1. The optimal temperature to produce microalgal biomass and lipid was 20°C, and after 15days of batch cultivation the productivities of 313.3g biomass·(gP)-1, 112g lipid (gP)~(-1) and 14.7g TAGs·(gP)~(-1) were obtained. The content of polyunsaturated fatty acids decreased with the increase of cultivation temperature. The reactive oxygen species (ROS) levels at 10°C and 20°C were higher than that under higher temperature. For the first time the cultivation temperature, ROS level, specific growth rate and lipid content per microalgal biomass were correlated together.