Fig. 3.

Experimental results of our specificity test are summarized. The fluorescent signals from Salmonella contaminated buffer samples at different concentrations are compared against the fluorescent signals from E. coli O157:H7 contaminated buffer samples. As desired, Salmonella contaminated samples did not cause cross-reactivity. For each measurement point, 3 different samples are used (i.e., n = 3). The standard deviation (σ) for the control sample fluorescence signal level is 0.62.