CPC D01F 4/02 (2013.01) [C07K 14/435 (2013.01); C07K 14/43518 (2013.01); D01C 3/00 (2013.01); D01F 1/02 (2013.01)] | 12 Claims |
1. A method for producing a polar solvent solution in which a solute containing a polyamino acid is dissolved in a polar solvent, comprising:
changing a water content of the solution to adjust the viscosity of the solution,
wherein the solution has a water content of less than 5% by mass based on 100% by mass of the solution, and
the polar solvent comprises at least one selected from the group consisting of dimethylsulfoxide (DMSO), N,N-dimethylformamide (DMF), N,N-dimethylacetamide (DMA), and N-methyl-2-pyrrolidone (NMP).
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