Abstract
Pathogen screening is an important measure for ensuring food safety. A colorimetric biosensor was presented for Salmonella determination employing staggered magnetic bead chains for continuous-flow bacteria isolation, MnO2 nanozymes for effective signal amplification, and smartphone for accurate catalysate analysis. First, immune magnetic beads were distributed under the staggered magnetic field to form higher magnetic bead chains to occupy more cross-section of separation channel. Then, target bacteria were injected and captured onto magnetic bead chains, followed by labeling with the immune MnO2 nanozymes to form bead-bacteria-nanozyme complexes. Finally, H2O2-TMB substrate was catalyzed by MnO2 nanozymes on these complexes, and color change was monitored and analyzed through smartphone to quantify target bacteria. The sensor enabled Salmonella detection as few as 60 CFU/mL in 2 h.
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