| 摘要 |
PURPOSE:To culture the subject blue-green alga useful as a raw material of functional food by increasing gamma-linolenic acid accumulated in the alga with further adding ammonium salt to a medium at logarithmic growing stage thereof in a cultivation using a specific inorganic liquid medium. CONSTITUTION:A blue-green alga of genus Spirulina is cultured in an inorganic liquid medium containing nitrate of alkali metal as an N-source and ammonium salt is further added to the medium at a logarithmic growing stage of the blue- green alga to culture the objective blue-green alga. Besides, said blue-green alga is once harvested during a period from middle stage to final stage in the logarithmic growing stage and blue-green alga harvested at the next time is preferably cultured again in a medium containing ammonium salt. |
