| 摘要 |
Substantially pure, intracellularly produced, soluble recombinant ricin toxin A (RTA) is recovered from transformed cells by disrupting the cell membrane, removing insoluble cell membrane materials from the disruptate, adjusting the pH of the cell membrane material-free solution to 6 to 6.5 and the conductivity to 1.25 to 1.75 millisiemens, passing the adjusted solution through a bed of SP-cellulose cation exchanger, and eluting the substantially pure RTA from the bed. |
