| 摘要 |
PROBLEM TO BE SOLVED: To provide a separation membrane having hydrophilicity, high chemical resistance, high retention of a permeated water amount when an enzyme solution is filtered and a high removal rate of an enzyme, a production method of the same, a module with the separation membrane and a concentrating method and a filtering method of the enzyme using the separation membrane.SOLUTION: In a separation membrane containing a hydrophobic polymer and a hydrophilic polymer, the hydrophilic polymer contains a polyvinyl pyrrolidone having a weight average molecular weight of 2,000 or more and less than 50,000 and difference between a contact angle of one surface and a contact angle of another surface is 6 degrees or more. |
