Dialysing membranes made of regenerated cellulose prepared from linters. The dialysing membranes contain water, glycerol and small amounts of sulfur compounds being predominantly polysulfides (approx. 0.1 %). Glycerol and sulfur can be removed by intensive washing of the membranes.
To preserve humidity the membrane rolls are packaged in polyethylene bags. The membranes lose elasticity when they emit humidity to the air.
The molecular weigh cut-off is 3500 to 14000 dalton. Various buffer solutions should be tested as the charge of the molecule can be changed by the pH of the medium. Pulling at the membrane in one direction decreases pore size, pulling in both directions increases the pore size. Wet membranes should not dry out. For preservation they are kept in benzoic acid or formaldehyde.
||3,5||108 x 108||25||493.00|
||6 - 8||240 x 240||25||771.00|
||12 - 14||150 x 150||25||434.00|
||12 - 14||200 x 200||25||578.00|