期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1218, 期 41, 页码 7341-7346出版社
ELSEVIER
DOI: 10.1016/j.chroma.2011.08.045
关键词
Ochratoxin A; Aptamer; Magnetic nanospheres; Solid-phase extraction; Food analysis
资金
- National Natural Science Foundation of China [20621502]
- Scientific Technology Project of Guangdong Province [2005B33701012]
- Medical Science Foundation of Guangdong Province [A2007072]
A sorbent based on the aptamer for ochratoxin A was immobilized onto magnetic nanospheres (MNS) and used to develop a magnetic solid-phase extraction procedure to clean up food samples in conjunction with high-performance liquid chromatography separation and fluorescence detection. Specific retention of ochratoxin A by the sorbent was demonstrated, and the capacity of the MNS-aptamer sorbent was determined. The efficacy of this new approach was successfully evaluated through comparison with solid-phase extraction on commercial C18 cartridge. Several different food samples fortified in the range of with 2.5-50 mu g/kg yielded mean recoveries from 67% to 90%, respectively. Finally, this oligosorbent was applied to the selective extraction of ochratoxin A from unfortified food samples. (C) 2011 Elsevier B.V. All rights reserved.
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