Chemical reagents
The following chemical materials and reagents were used and purchased
from commercial suppliers without further purification: SA and chitosan
(viscosity of 200 ± 20 mPas, Shanghai Aladdin Biochemical Technology
Co., Ltd., Shanghai, China); CaCl2 (Kaixiang fine
chemical co. LTD, Shanghai, China); LNT (purity:98%, Watson
International Ltd).