[Elaboration of an immunosorbent for the purification of porins from Salmonella typhi 9, 12, Vi:d].

The current work was undertaken to purify porins of Salmonella typhi, which are outer membrane proteins (OMPs) that induce protection in mice against challenge with the bacteria in mucin. OMPs, isolated with a non-ionic detergent, had a 4% contamination with LPS (endotoxin) and molecular sizes ranging from 17 to 70 KDa. Porins (Mw 38-41 KDa) were isolated from OMPs preparative SDS-PAGE. Anti-porins antisera were raised in rabbits and specific IgG was purified, which was coupled to Sepharose-CNBr. This immunosorbent was used to purify LPS-free porins.