| 摘要 |
PURPOSE:To obtain silk fibroin powder having high bulk density and high rate of dissolution and solubility in cold water, and suitable as a cosmetic base, by adjusting a silk fibroin solution to specific concentration and pH, and freeze-drying the solution. CONSTITUTION:A silk fibroin solution produced by dissolving silk fiber in an aqueous medium (preferably containing calcium chloride, etc.) is optionally hydrolyzed, and adjusted to a silk fibroin concentration of 2-40wt% and a pH of 4.5-7.5. The adjusted solution is freeze-dried to obtain powdery silk fibroin peptide having an average polymerization degree of 3-600, and a bulk density of 0.2-0.7g/cm<3> at the average particle diameter of 10-40mu. At least 50wt% of the product has alpha-structure which is soluble easily in cold water. |
