Production method for concentrated von willebrand factor or complex of factor eight and von willebrand factor, involves preparing solution containing specific concentration and nanofiltering solution

摘要

The method involves preparing a solution of von Willebrand factor or complex of factor eight and von Willebrand factor. The solution contains a specific concentration and a ratio of von Willebrand factor and factor eight greater than or equal to 0.4. The prepared solution is nanofiltered through a filter pore size of less than 35 nanometers.