PEROXIDASE-CONJUGATE CHROMATOGRAPHY ISOLATION OF CONJUGATES PREPARED WITH GLUTARALDEHYDE OR PERIODATE USING POLYACRYLAMIDE-AGAROSE GEL

Fractionation abilities of polyacrylamide-agarose gel (Ultrogel) and dextran gel (Sephadex) column chromatography were compared in isolating horseradish peroxidase conjugates prepared using 2 different methods. Ultrogel AcA-44 provides an efficient separation of monomer conjugated and nonconjugated [human] immunoglobulins resulting from the 2-step glutaraldehyde procedure; Sephadex G-200 does not. Both types of columns eluted the polymer conjugates resulting from the periodate procedure in the void volume; these were hardly isolated from the small amount of monomer conjugate. Unreacted horseradish peroxidase, present in very low quantities after the efficient periodate method and in large amounts after the glutaraldehyde procedure, was separated by both gel types.