Aptamer-targeted magnetic nanospheres as a solid-phase extraction sorbent for determination of ochratoxin A in food samples

作者：Wu, Ximei^*; Hu, Jun; Zhu, Binghui; Lu, Lin; Huang, Xiangdong; Pang, Daiwen

来源：Journal of Chromatography A, 2011, 1218(41): 7341-7346.

DOI：10.1016/j.chroma.2011.08.045

• Ochratoxin A
• Aptamer
• Magnetic nanospheres
• Solid-phase extraction
• Food analysis

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.

• 出版日期2011-10-14
• 单位广东省疾病预防控制中心; 武汉大学