I am working on a project involved drug metabolism by NADP/NADPH enzyme. I want to remove the enzyme from my reaction mixture. I am looking for the amicon centrifugal concentrator to remove that enzyme. Can anyone suggest me which concentrator would be suitable for that enzyme removal (NMWL -3000; 10,000; 30,000; 50,000; or 100,000)?. Could anyone tell me the size of NADP/NADPH enzyme in dalton units?