Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 197, Issue -, Pages 107-113Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2017.11.045
Keywords
Neomycin; Monoclonal antibody; Surface-enhanced Raman spectroscopy; Lateral flow immunoassay strip
Categories
Funding
- National Science & Technology Pillar Program of 12th Five-Year Plan [2014BAD13B05]
- National Natural Science Foundation of China [31272547]
- China Agriculture Research System [CARS-36]
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An ultrasensitive method for the detection of antibiotics in milk is developed based on inexpensive, simple, rapid and portable lateral flow immunoassay (LH) strip, in combination with high sensitivity surface-enhanced Raman spectroscopy (SERS). In our strategy, an immunoprobe was prepared from colloidal gold (AuNPs) conjugated with both a monoclonal antibody against neomycin (NEO-mAb) and a Raman probe molecule 4-aminothiophenol (PATP). The competitive interaction with immunoprobe between free NEO and the coated antigen (NEO-OVA) resulted in the change of the amount of the immobilized immunoprobe on the paper substrate. The LFI procedure was completed within 15 min. The Raman intensity of PAW on the test line of the LFl strip was measured for the quantitative determination of NEO. The IC50 and the limit of detection (LOD) of this assay are 0.04 ng/mL and 0216 pg/mL of NEO, respectively. There is no cross-reactivity (CR) of the assay with other compounds, showing high specificity of the assay. The recoveries for milk samples with added NEO are in the range of 89.7%-105.6% with the relative standard deviations (RSD) of 2.4%-53% (n = 3). The result reveals that this method possesses high specificity, sensitivity, reproducibility and stability, and can be used to detect a variety of antibiotic residues in milk samples. (C) 2017 Elsevier B.V. All rights reserved.
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