| abstract |
(57) Abstract: The present invention provides a method for efficiently producing a large amount of lactic acid, which is a raw material for biodegradable plastics, by using starch as a raw material for microalgae accumulation. SOLUTION: Microalgae that accumulate starch in cells are cultured, and the alga bodies in the culture solution are concentrated to a solid concentration of 10% by weight or more, and the concentrated microalga slurry is kept in a dark and anaerobic atmosphere. , Lactate the intracellular starch by keeping the pH in the range of 4-9. |