Excessive use of antibiotics in aquaculture
severely endangers
human health and ecosystems, which has raised significant concerns
in recent years. However, conventional laboratory-based approaches
regularly required time or skilled manpower. Herein, we propose a
point-of-care-testing (POCT) biosensor detection device for the simultaneous
determination of multiantibiotics without complex equipment or professional
operators. A laser-printed paper-based microfluidic chip loaded with
multicolor fluorescence nanoprobes (mCD-μPAD) was developed
to rapidly detect sulfamethazine (SMZ), oxytetracycline (OTC), and
chloramphenicol (CAP) on-site. These “fluorescence off”
detection probes composed of carbon dots (CDs) conjugated with aptamers
(donor) and MoS2 nanosheets (acceptor) (CD-apt-MoS2) were based on Förster resonance energy transfer.
Upon the addition of target antibiotics, the significantly recovered
fluorescence signal on the μPAD can be sensitively perceived
by employing a 3D-printed portable detection box through a smartphone.
Under optimal conditions, this μPAD allowed for a rapid response
of 15 min toward SMZ, OTC, and CAP with considerable sensitivities
of 0.47, 0.48, and 0.34 ng/mL, respectively. In shrimp samples, the
recoveries were 95.2–101.2, 96.4–105, and 96.7–106.1%
with RSD below 6%. This paper-based sensor opens an avenue for on-site,
high-throughput, and rapid detection methods and can be widely used
in POCT in food safety.
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