| 摘要 |
Ribonucleic acid is extracted from yeast by subjecting an aqueous yeast slurry containing solid matter present in a waste sulphite liquor to heat treatment to extract ribonucleic acid from the yeast, separating the liquid part from the yeast in the slurry and recovering the ribonucleic acid extracted and contained in the separated liquid part, e.g. by acidifying to precipitate the ribonucleic acid. The yeast slurry may comprise a mixture of propagated yeast and spent wort discharged from a fermentor wherein the yeast has been fermented on a culture medium containing a waste sulphite liquor, or may be prepared by mixing yeast and a waste sulphite liquor. The heat treatment preferably takes place at 90 DEG C. to 120 DEG C. for 30 to 300 minutes at pH 4 to 9.
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