| 摘要 |
PURPOSE:To obtain the subject stimulating agent containing a scarcely water-soluble low-molecular chitin fine powder having a specific viscosity and a specific average particle diameter as an active component, effective for reducing the administration dose of antibiotics, etc., and improving the problem of residual chemicals and useful for producing fish having high quality. CONSTITUTION:Chitin known as a constituent component of the cell wall of crustaceans such as shrimp and crab, insects such as beetles and cricket and fungi such as shiitake mushroom is dissolved by adding concentrated hydrochloric acid. The solution is stirred for several tens min to several hr and the reaction product is washed with water, neutralized and washed under centrifugal force to obtain a scarcely water-soluble low-molecular chitin fine powder having a viscosity of 30-5cp (measured by dissolving in a lithium chloride solution) and an average particle diameter of <=10mum. The chitin is used as an active component of the objective immunostimulating agent. |
