EFFICIENT PREPARATION OF MONOSPECIFIC ANTI-CANINE C-REACTIVE PROTEIN SERUM AND PURIFICATION OF CANINE C-REACTIVE PROTEIN BY AFFINITY-CHROMATOGRAPHY

The canine C-reactive protein (CRP) fraction isolated from canine acut e-phase serum on a phosphorylcholine-Sepharose 4B column was further s ubjected to Sephacryl S-300 gel filtration. A canine CRP fraction not containing IgM was then obtained. The antisera, obtained after several immunizations with this canine CRP fraction, contained nonspecific an tibodies that reacted with albumin, transferrin and IgG in addition to CRP. This antiserum could be easily changed to monospecific canine CR P serum, when it was subjected to absorption for only 15 min using glu taraldehyde-insolubilized normal canine serum protein containing 3.5 m ug ml-1 of CRP. Pure canine CRP was isolated with a recovery rate of 9 5% from canine acute-phase serum by affinity chromatography using spec ific anti-canine CRP antibody.