Serum and serum fractions from patients with rheumatoid arthritis have been subjected to anion exchange chromatography on diethylaminoethyl cellulose. The rheumatoid factor activity was clearly separated from the bulk of the gamma globulin by virtue of the anomalous behavior of macroglobulins on this column. Purification of rheumatoid factor by precipitation with fraction II, resolution in 4 M ...

Cerebrocuprein and hepatocuprein have been isolated from extracts of human brain and liver, respectively, by a method which utilizes ion exchange chromatography and gel filtration procedures. Detailed studies of the physical, chemical, and immunological properties of the purified proteins were conducted. A comparison of the results with similar data obtained for erythrocuprein from human erythr...

A manual modification of an automated method [Atkinson, K. F., Clin. Chem. 18, 1001 (1972)] for enzymatic assay of 2,3-diphosphoglycerate is described, which is suitable for small laboratories. Samples are easily prepared for analysis, and preparations are stable for several months. Virtually all of the color generated in the colorimetric assay is produced by the diphosphoglycerate-catalyzed re...

A major problem encountered in the large-scale purification of the bivalent anti-T cell immunotoxin, A-dmDT390-bisFv(G4S), from Pichia pastoris supernatants was the presence of host glycoproteins exhibiting similar charge, size, and hydrophobicity characteristics. We overcame this problem by employing borate anion exchange chromatography. The borate anion has an affinity for carbohydrates and i...