Novel ratiometric electrochemical aptasensor based on broad-spectrum aptamer recognition for simultaneous detection of penicillin antibiotics in milk.
Food Chem
; 456: 139946, 2024 Oct 30.
Article
in En
| MEDLINE
| ID: mdl-38852450
ABSTRACT
To effectively monitor multi-residues of penicillin antibiotics (PENs) in milk, we developed a novel ratiometric electrochemical aptasensor enabling simultaneous detection of PENs. The aptasensor employed a broad-spectrum aptamer as a recognition element, niobium carbide functionalized with methylene blue (Nb2C-MB) as a reference signal generator, and a ferrocene-labeled aptamer (Fc-Apt) as an output signal. Electrodes were modified with Fe-N-C doped carbon nanotubes (Fe-N-C-CNTs) to amplify detection signals further. During detection, Fc-Apt binding to PENs decreased Fc current intensity (IFc) and increased MB current intensity (IMB). The simultaneous detection of PENs was achieved using IMB/IFc as a quantitative signal. Under optimal conditions, a good linear relationship between IMB/IFc and antibiotic concentration was observed, indicating the aptasensor had a robustness. The limits of detection of aptasensor for four penicillin antibiotics and their mixed targets were 0.093-0.191 nM. This work provides a new approach to multi-residue detection of the same class of antibiotics.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Penicillins
/
Biosensing Techniques
/
Food Contamination
/
Milk
/
Aptamers, Nucleotide
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Electrochemical Techniques
/
Anti-Bacterial Agents
Limits:
Animals
Language:
En
Journal:
Food Chem
Year:
2024
Document type:
Article