TEST ITEMS SPECIFICATION RESULTS Description : White or Almost White Crystalline Powder Identification : . Positive Assay : ~% % Specific Rotation : +101°~+105° +° Loss On Drying : %max % Melting Point : 153~157°C ~°C Organic Volatile Impurities : meets the requirement. Conforms Related Substances : meets the requirement. Conforms Residual Solvents : meets the requirement.(USP29) Conforms Particle Size : 100% ≤ 20 microns Conforms
Cellulose acetate (CA) membranes have a very low binding affinity for most macromolecules and are especially recommended for applications requiring low protein binding, such as filtering culture media containing sera. However, both cellulose acetate and cellulose nitrate membranes are naturally hydrophobic and have small amounts (less than 1%) of non-toxic wetting agents added during manufacture to ensure proper wetting of the membrane. If desired, these agents can be easily removed prior to use by filtering a small amount of warm purified water through the membrane or filter unit. Surfactant-free cellulose acetate membranes with very low levels of extractables are available on some Corning® syringe filters.