FIG 3.

Optimization of the amount of chromogenic agar. Different amounts of chromogenic agar were deposited into the microfluidic chip. C. jejuni F38011 (10⁸ CFU/ml) was incubated in the microfluidic chip at 42°C for 24 h. Photos of incubation chambers were captured using an iPhone 6. We employed ImageJ to analyze the average color intensity of each entire incubation chamber and expressed the intensity in ΔRGB value. The results are presented as the mean $\pm$ standard deviation of four biological replicates. One-way ANOVA followed by post hoc Dunnett’s test was conducted for statistical analysis. Asterisks (*) indicate significant differences (P < 0.05) between the negative-control and test groups.