Vandenberg R J, Easterbrook-Smith S B
Immunol Lett. 1987 Jan;14(2):155-8. doi: 10.1016/0165-2478(87)90095-2.
The cation exchange resin BioRex-70 was able to activate the classical complement pathway in human serum at 37 degrees C over the resin concentration range 0-5% (v/v). Using zymosan-treated human serum, it was found that the activation proceeded as far as complement protein C3.