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Analytical Chemistry

Analytical Chemistry

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Rapid and Automated Detection of Six Contaminants in Milk Using a Centrifugal Microfluidic Platform with Two Rotation Axes

Published:24 May 2019 DOI: 10.1021/acs.analchem.9b01998 PMID: 31124361
Yiqi Chen, Yunzeng Zhu, Minjie Shen, Ying Lu, Jing Cheng, Youchun Xu*

Abstract

Antibiotic residues and illegal additives are among the most common contaminants in milk and other dairy products, and they have become essential public health concerns. To ensure the safety of milk, rapid and convenient screening methods are highly desired. Here, we integrated microarray technology into a microfluidic device to achieve rapid, sensitive, and fully automated detection of chloramphenicol, tetracyclines, enrofloxacin, cephalexin, sulfonamides, and melamine in milk on a centrifugal microfluidic platform with two rotation axes. All the liquid reagent for the immunoassay was prestored in the reagent chambers of the microdevice and can be released on demand. The whole detection can be automatically accomplished within 17 min, and the limits of detection were defined as 0.92, 1.01, 1.83, 1.14, 1.96, and 7.80 μg/kg for chloramphenicol, tetracycline (a typical drug of tetracyclines), enrofloxacin, cephalexin, sulfadiazine (a typical drug of sulfonamides), and melamine, respectively, satisfying the national standards for maximum residue limits in China. Raw milk samples were used to test the performance of the current immunoassay system, and the recovery rates in the repeatability tests ranged from 80 to 111%, showing a good performance. In summary, the immunoassay system established in this study can simultaneously detect six contaminants of four samples in a fully automated, cost-effective, and easy-to-use manner and thus has great promise as a screening tool for food safety testing.

Substances (24)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Chloramphenicol 56-75-7 C11H12Cl2N2O5 1061 suppliers $8.00-$2850.00
Chloramphenicol 56-75-7 C11H12Cl2N2O5 1061 suppliers $8.00-$2850.00
Chloramphenicol 56-75-7 C11H12Cl2N2O5 1061 suppliers $8.00-$2850.00
Chloramphenicol 56-75-7 C11H12Cl2N2O5 1061 suppliers $8.00-$2850.00
Enrofloxacin 93106-60-6 C19H22FN3O3 732 suppliers $6.00-$2194.50
Enrofloxacin 93106-60-6 C19H22FN3O3 732 suppliers $6.00-$2194.50
Enrofloxacin 93106-60-6 C19H22FN3O3 732 suppliers $6.00-$2194.50
Enrofloxacin 93106-60-6 C19H22FN3O3 732 suppliers $6.00-$2194.50
Cephalexin 15686-71-2 C16H17N3O4S 527 suppliers $6.00-$1238.00
Cephalexin 15686-71-2 C16H17N3O4S 527 suppliers $6.00-$1238.00
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