Journal
FOOD CONTROL
Volume 73, Issue -, Pages 726-733Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodcont.2016.09.023
Keywords
Fluorescence sensor assay; beta-lactamase; Aptamer; Graphene oxide
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Funding
- National Natural Science Foundation of China [41071176, 41271340]
- Guangdong Natural Science Foundation [S2013030013338]
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Fluorescent sensor assay (FSA) was developed by using a fluorescein-labeled aptamer assembled onto Graphene oxide (GO) in order to determine beta-lactamase in milk. Under optimal conditions, FSA indicated a detection range from 1 to 46 U/mL with a limit of detection (LOD) of 0.5 U/mL (R-2 = 0.999, n = 3). In addition, commercial milk samples tainted with beta-lactamase were detected by the established FSA with a recovery rate between 96.04 and 119.67%. Additionally, the reliability and sensitivity of FSA was validated by enzyme-linked immunoassay (ELISA) with a high correlation of 0.993. Thus, these data, combined with the ease and speed of the assay, suggest that the developed FSA may represent a promising method for monitoring beta-lactamase contamination in milk. (C) 2016 Elsevier Ltd. All rights reserved.
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