Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 41, Pages 10390-10396Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201800092
Keywords
aptamers; covalent organic frameworks; extraction; magnetic properties; trace analysis
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Funding
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, China [2015-29]
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A solid-phase extraction adsorbent based on an aptamer-functionalized magnetic conjugated organic framework (COF) was developed for selective extraction of traces of hydroxylated polychlorinated biphenyls. This material has advantages such as superparamagnetism of the magnetic core, high surface area and porous structure of the COF, and high specific affinity of the aptamer. In combination with HPLC-MS, the aptamer-functionalized magnetic COF was used for the capture of hydroxy-2,3,4,5,5-pentachlorobiphenyl in human serum. The method provided a linear range of 0.01-40 ngmL(-1) with a good correlation coefficient (R-2=0.9973). The limit of detection was as low as 2.1 pgmL(-1). Furthermore, the material showed good reusability and could be applied in at least ten extraction cycles with recoveries greater than 90%.
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