We obtained the sequence for an immunogenic Salmonella Typhimurium antigen and a corresponding anti-S. Typhimurium antibody from Prof. Dr. Hust's laboratory. Both His-tagged proteins were successfully expressed in E. coli and spotted on a PDITC surface. In an iRIf measurement we analyzed the binding between S. Typhimurium antigen and antibody (figure 5). The measurement was a success. When the S. Typhimurium antibody was flushed over the chip a distinct shift in the binding curve for the S. Typhimurium antigen spot was detectable, whereas the negative control showed no binding event (figure 6). Moreover, the obtained iRIf result was validated with a standardized method. The purified antigen was analyzed by a 12.5% SDS-PAGE. Afterwards a Western Blot was performed using the self-purified antibody. This antibody is genetically fused to a c-Myc tag that is not present in the antigen. Therefore, we used an anti-c-Myc antibody derived from goat as secondary antibody. For detection via chemiluminescence an anti-goat HRP was used. The conventional method confirmed the binding of the anti-S. Typhimurium antibody to the corresponding antigen (figure 7B). The presence of both proteins was additionally validated by Western Blot with an anti-His conjugated antibody (figure 7A). With this measurement we demonstrated that our system is able to detect a specific antigen-antibody binding.