As reported in our previous work [41], we developed a stable Na2[Cu(OH)4]/NaOH/urea system to dissolve chitin based on the alkali/urea solvent system. In this system, chitin was dissolved using the freeze-thaw method to accomplish uniform blending of Na2[Cu(OH)4] and polymeric chains ...
Next, 2.0 mL of 4.8 mol L−1 NaOH aqueous solution was added to the above-mixed solution and contineously stirred for 5 min to obtain a blue solution. Finally, 2.0 mL of 1.2 mol L−1 ascorbic acid solution was added into the obtained blue solution and stirred for ...
The SIF was comprised of SIF electrolyte stock solution (55% v/v), pancreatic lipase solution (1200 U/mL, 25% v/v), bile salt solution (8 mg/mL, 12.5% v/v), 0.3 M CaCl2 (0.2% v/v), ultrapure water (0.75% v/v), and its pH was adjusted to 7 with 1 mol/L NaOH (6.55%...