Portable electrochemical sensors for the detection of antibiotic (AB) contamination are gaining interest as point of care devices and as in-field analytical sensors. In that respect, the low cost and high sensitivity of the sensors is a major benefit. In this study, a low-cost indicator electrode was designed against neomycin (NEO), gatifloxacin (GAT) and sulfathiazole sodium (STNa) as examples of ABs with high probability of contaminating animal feed/water. Ionophore functionalized magnetic

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... oparticles were incorporated into the electrode structure to enhance its performance. The detector was able to discriminate (within 10 s) AB clean from AB contaminated water in ranges of 10 −3 -10 −8 M, of 10 −2 -10 −8 M, and of 10 −2 -10 −13 M for NEO, GAT and STNa, respectively. The developed electrodes can be fabricated at low cost; with promising fast and high sensitivity for the detection of AB contamination in water.