Journal
FOOD CHEMISTRY
Volume 307, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2019.125528
Keywords
Au nanobipyramids; Anodic aluminum oxide; Aflatoxin B-1; Peanut sample; On-site analysis
Funding
- National Natural Science Foundation of China, China [21675028]
- Nature Sciences Funding of Fujian Province [2018J01682]
- STS Key Project of Fujian Province, China [2017T3007]
- cooperative project of production and study in University of Fujian Province, China [2018Y4007]
- Program for New Century Excellent Talents in Fujian Province University, China
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Simple, rapid, convenient, and economical surface enhanced Raman scattering (SERS) substrate is developed for on-site evaluation of Aflatoxin B-1 (AFB(1)) in food matrix using handheld Raman Spectrometer. Self-assembly of gold nanobipyramids (Au NBPs) into the nanoholes of anodic aluminum oxide (AAO) template/pattern using 'drop-dry' approach provides a reliable pathway for the rapid fabrication of highly active and uniform SERS substrate. It shows enhanced and reproducible SERS signals towards the probe molecule, 4-aminothiophenol (4-ATP) with a relative standard deviation (RSD) of less than 10% and an average enhancement factor (EF) of 1 x 10(8). For practical application, the proposed method is demonstrated for the detection of aflatoxin B-1 (AFB(1)) in peanut extracts. The results show that the AFB(1) in peanut extracts can be identified within 1 min, with a limit of detection of 0.5 mu g/L. Compared with conventional ELISA based AFB(1) analysis, our method is much more efficient (1 min versus > 30 min).
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