Tipaporn SaetangNitaya TreamwattanaPorntip SuttijitpaisalKavi RatanabanangkoonMahidol University2018-07-042018-07-041997-10-24Journal of Chromatography B: Biomedical Applications. Vol.700, No.1-2 (1997), 233-239157264952-s2.0-0030678005https://repository.li.mahidol.ac.th/handle/20.500.14594/17931A quantitative comparison was made on the fractionation of pepsin- digested horse antivenoms by ammonium sulfate (AS) fractional precipitation and ion-exchange chromatography on Q-Sepharose. In the precipitation process, pepsin digested horse anti-Naja kaouthia serum was precipitated by 30% saturated AS followed by 50% saturated AS. The recovery of antibody activity [as measured by an enzyme-linked immunosorbent assay (ELISA) against the cobra postsynaptic neurotoxin 3] from the 30-50% saturated AS precipitate was 53% with a 1.93-fold purification. For the chromatographic process, the behavior of the horse antitoxin antibody and its F(ab')2fragments was first studied. The pepsin digested horse serum was then desalted on a Bio-gel P-2 column followed by chromatography on Q-Sepharose using a linear gradient (20 mM Tris-HCl, pH 8.0 containing 0.0 to 0.5 M NaCl). A peak containing primarily the F(ab')2antibody could be obtained. This peak constituted 73% of the total antivenom activity with 2.08-fold purification. The total recovery of antibody activity by the chromatographic process was 90%. The yield of antibody activity was about 2-fold higher than that reported previously with other fractionation procedures. The implications of these results for the refining of horse therapeutic antivenoms are discussed.Mahidol UniversityChemistryArticleSCOPUS10.1016/S0378-4347(97)00244-2