| 摘要 |
21 The present invention relates to a filtration membrane which enables only a macromolecular component to be recovered with a high efficiency from a culture solution of a microorganism containing a particulate component and a macromolecular component. The filtration membrane according to the present invention is characterized by pores having an average pore diameter in the range from 10 nm to 10 .mu.m or pores having a cut-off molecular weight in the range from 1 x 104 to 1 x 108, the membrane having a permeation resistance in the range from 5 x 1011 m-1 to 1 x 10l5 m
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