Aqueous solution of calcium chloride (CaCl
2) is a promising solvent for biomaterial like silk fibroin, thereby offering potential application in industrial purposes. We observed that the silk, produced by larvae of hornets (
Vespa), dissolved in an aqueous solution of CaCl
2 in the concentration range of 3-6 M. The solubility of hornet silk was the maximum when CaCl
2 concentration was 4.5 M. The rate of dissolution of the hornet silk in the aqueous solution of CaCl
2 was sensitive to temperature. The hornet silk was found to dissolve in 4.5 M CaCl
2 solution even at 20°C. Such high solubility of the hornet silk in the aqueous solution of CaCl
2 could be attributed to the low content of β-sheet structure. The silk dissolved in the aqueous solution of CaCl
2 within 1 h when the temperature was between 40 and 80°C, and less protein degradation occurred under the aforementioned condition.
抄録全体を表示