Isolation of alpha-1-antitrypsin from human plasma by partitioning in aqueous biphasic systems of polyethyleneglycol–phosphate

GUILLERMO ALFREDO PICO; NERLI, B; RHE, G.

JOURNAL OF CHROMATOGRAPHY B

Elsevier

Lugar: Amsterdant; Año: 2002 vol. 780 p. 396 - 396

0378-4347

The partitioning of alpha-1-antitrypsin was assayed in biphasic aqueous systems containing potassium phosphate and two olyethyleneglycols of molecular mass 600 and 1000, respectively. In order to isolate the alpha-1-antitrypsin from serum plasma, the partitioning behaviour of human serum albumin, its principal contaminant, was also studied. Several aqueous two-phase systems with different partitioning properties were obtained by varying the PEG1000/PEG600 mass proportion. In systems with PEG1000/PEG600 mass ratio of 8, the optimal difference between the partition coefficients of both proteins was found. Under such conditions, a satisfactory purification was carried out by a three-step extraction procedure. By applying this method the alpha-1-antitrypsin specific activity increased severalfold (nearly 10 times) with a yield of 43