Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 62, Issue 19, Pages 4261-4267Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf501659m
Keywords
aflatoxin quantification; HPLC-MS/MS; sample pretreatment; magnetic solid phase extraction; polydopamine coated magnetic nanoparticles; wine analysis
Funding
- National Institutes of Health [GM 089557, G12MD007581]
- National Natural Science Foundation of China [81173536, 21202161]
- U.S. Department of Education/Title III Graduate Education Program at Jackson State University [P031B090212-13]
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A facile magnetic solid phase extraction (MSPE) of aflatoxins (AFs) from liquid samples was developed using polydopamine-coated magnetic nanoparticles (PD-MNPs) as the adsorbent. PD-MNPs were prepared from amine-terminated MNPs and dopamine via an in situ oxidative self-polymerization approach. Under the selected MSPE conditions, extraction yields ranging from 59.3% for AF G(2) to 89.0% for AF B-1 were obtained with good repeatability. Coupled with HPLC-MS/MS quantification, the MSPE procedure serves not only for sample cleanup but also for AFs enrichment that is highly desired for trace analysis. The proposed MSPE-HPLC-MS/MS method had a linear calibration curve in the concentration range from 0.00600 to 3.00 ng/mL aflatoxin and limits of detection of 0.0012 ng/mL for AF B-1, AF B-2, and AF GI, and 0.0031 ng/mL for AF G(2).
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