| 摘要 |
PURPOSE:To obtain 4-ketozeaxanthin useful as an agent for improving the color tone of cultured fish, etc., on an industrial scale at a low cost by culturing a 4-ketozeaxanthin-producing bacterial strain belonging to the genus Flavobacterium in a medium and separating the compound from the cultured product. CONSTITUTION:4-ketozeaxanthin useful as a color-tone improving agent such as a coloring component for cultured fish and shellfish (e.g. shrimp and red sea bream) and a color-tone improving agent for goldfish and fancy carp can be produced in high yield by culturing a bacterial strain belonging to the genus Flavobacterium, Alcaligenes, Pseudomonas, Alteromonas, Hyphomonas or Caryophanon and capable of producing 4-ketozeaxanthin [e.g. Flavobacterium sp. N-81106 (FERM P-12782)] in a medium and separating the compound from the cultured product. |
