The preliminary study of lipid production of Nostoc sp. from Bueng Boraphet, Nakhon Sawan Province

Our study was focused on optimum physical and nutritional conditions in lipid accumulation of microalgae (Nostoc sp.) from Bueng Boraphet using BG-11 as cultured media. Results showed that the optimum temperature and acid-base value were at 30 oC and pH 7.0, respectively under autotrophic condition. Nostoc sp. was able to properly grow and gave 0.517 g/L dry cell weight and 4.16% lipid content. The optimum nutrition for lipid accumulation by Nostoc sp. was then examined. These conditions were found to be 0.15% potassium nitrate (KNO3), 10% glucose and 0.004% dipotassium phosphate (K2HPO4) at 30 oC, pH 7.0 under mixotrophic condition. Nostoc sp. showed the highest dry cell weight and lipid content at 1.314 g/L and 4.48 percent respectively. The trend of lipid accumulation was depend on the growth rate of Nostoc sp.