The effects of absorption time, titer of antiserum or lectin in the absorption stage, and elution temperature on relative antibody or lectin yield in elutes in the absorption-elution procedure were studied in bloodstains and ammoniacal extracts of bloodstains using conventional grouping reagents. In addition, monoclonal anti-A and anti-B and affinity-purified Ulex europaeus agglutinin I (UEA I) reagents were employed for comparison in these processes. Ammoniacal extracts of bloodstains and dried bloodstains on cotton substrata behaved comparably with respect to the parameters studied. The monoclonal anti-A and anti-B and UEA I reagents studied yielded satisfactory results, comparable in some cases to conventional reagents, with respect to the parameters studied.
ABO Blood-Group System Antibodies, Monoclonal