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  • Title: Purification of human antibodies from transgenic corn using aqueous two-phase systems.
    Author: Lee JW, Forciniti D.
    Journal: Biotechnol Prog; 2010; 26(1):159-67. PubMed ID: 19834982.
    Abstract:
    A recombinant human antibody expressed in corn was purified using aqueous two-phase extraction. The antibody was an immunoglobulin G fully unglycosylated. Using systems of different compositions and/or pHs in each of one or two partitioning stages followed by one more stage in which the antibody was precipitated at the liquid/liquid interface facilitated the removal of different impurities in each stage. The best system yields a product 72% pure (22-fold purification) with a yield of 49%. The optimum extraction was done in two partitioning stages followed by an interfacial precipitation stage using poly(ethylene)glycol/potassium phosphate systems. NaCl was added to the first stage to eliminate large molecular weight impurities. The pH in the first stage was kept at 6 but a pH of 8 was used in the second stage and in the precipitation stage.
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