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Selection of DNA aptamers and establishment of an effective aptasensor for highly sensitive detection of cefquinome residues in milk

Abstract

Cefquinome (CFQ), which is a fourth-generation cephalosporin approved for veterinary use only, has been widely used for treating porcine or bovine respiratory infection, bovine mastitis and other diseases. However, the antibacterial effect of CFQ is based on the duration of drug concentration remaining in excess of the minimum inhibitory concentration in serum or tissues, thereby inevitably leading to CFQ residues with high level in the animal-sourced food. In this paper, four CFQ-specific ssDNA aptamers were selected via magnetic bead-based systematic evolution of ligands by exponential enrichment (SELEX) method. Aptamer W1 with the lowest dissociation constant (Kd) value of 40.13 ± 22.11 nM was chosen for establishing a fluorescence aptasensor based on magnetic separation and release of molecular beacon for detection of CFQ residues. This aptasensor exhibited a high sensitivity toward CFQ with a limit of detection (LOD) of 0.09 ng/mL (linear range from 0.5 to 150 ng/mL). Moreover, the present aptasensor also showed high selectivity against interference molecules ampicillin and CFQ’s structure analogs (i.e., cefpirome sulfate and cefixime). Eventually, this aptasensor was used to detect CFQ in real spiked milk. The recovery rate of CFQ from spiked milk samples ranged from 96.6% to 103.2%. These results indicated the developed aptasensor a promising high sensitive and specific method of CFQ residues detection in animal-sourced food.

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Publication details

The article was received on 17 Apr 2018, accepted on 13 May 2018 and first published on 14 May 2018


Article type: Paper
DOI: 10.1039/C8AN00709H
Citation: Analyst, 2018, Accepted Manuscript
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    Selection of DNA aptamers and establishment of an effective aptasensor for highly sensitive detection of cefquinome residues in milk

    L. Wang, C. Wang and H. Li, Analyst, 2018, Accepted Manuscript , DOI: 10.1039/C8AN00709H

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