[Trophoblastic beta-globulin in immunoglobulin preparations]

The content of trophoblastic beta-globulin in 142 lots of commercial immunoglobulin preparations from 20 manufacturers, produced from placental, abortion and donor blood sera, has been studied. 83% of lots from abortion blood serum and 94% of lots from placental blood serum have been found to contain the admixture of this beta-globulin, its concentration in the lots from placental blood serum being significantly higher. The method for the detection of trophoblastic beta-globulin may be used for evaluating the quality of immunoglobulin preparations as it indicates the degree of their purification from placental proteins.