Fig. 1From: Development of a double-recombinant antibody sandwich ELISA for quantitative detection of epsilon toxoid concentration in inactivated Clostridium perfringens vaccinesa. Screening of clones by polyclonal phage ELISA. Epsilon toxoid was coated to plastic and then detected with an anti-c-Myc antibody. The coating was carried out in duplicate; the mean value is presented, the error bars indicat the standard deviation of the two values. 5% MPBS buffer was coated as a negative control. S1, S2, S3 = selection rounds 1, 2 and 3. b. Screening of clones by monoclonal phage ELISA of Tomlinson I + J and DAb libraries. Individual phage clones from the second and third rounds of selection were tested by monoclonal phage ELISA against purified epsilon toxoid. Phages were applied as follows; S2: 32 clones picked at random after round 2 of selection; S3: 36 clones picked at random after round 3 of selection. OD at 450 nm was measured after 10 minutes.Back to article page