Patent ID: 6936699

Claim:
A process for purifying and/or concentrating a biomass load of inclusion bodies in a solution, which is characterized in that the inclusion body-containing solution is directed tangentially past one or more semipermeable membranes so that the membranes retain the inclusion bodies and that substances or components having a relatively small molecular weight or particle diameter can pass through, thus obtaining a purified and/or concentrated inclusion body solution, and on the semipermeable membrane a planar net matrix is located which is constructed of intersecting longitudinal and transverse filaments such that the adjacent longitudinal and transverse filaments are, in each case, at a distance from one another which is 5 to 15 times greater than their thickness which is in the range from 150 to 600 μm, said matrix having a membrane to matrix distance of about 80 μm, a matrix thickness of about 760 μm, a filament thickness of about 340-450 μm and a filament distance of about 2400 μm.