Aptamer Self-Assembly-Functionalized Nanochannels for Sensitive and Precise Detection of Chloramphenicol
Xu-Qin Ran, Hai‐Long Qian, Xiu‐Ping Yan
Abstract
Sensitive and precise determination of chloramphenicol (CAP) is of great significance for human health due to its high risk in trace amounts. Solid-state artificial nanochannels are expected to be highly promising sensing devices owing to single-molecule sensitivity, target-specific selectivity, and portability. Herein, we report an aptamer self-assembly-functionalized artificial nanochannel-based sensor for highly sensitive and precise determination of CAP. Aptamer self-assembly (AAs) served as the specific recognition component and were in situ grown on the surface of stable anodic aluminum oxide (AAO) nanochannels to develop an [email protected] nanochannel-based sensor. Selective interaction with CAP led to the disassembly of AAs and sensitive current change of [email protected] nanochannels, allowing sensitive and precise sensing of CAP in complex food samples. The developed [email protected] nanochannel-based sensor showed a wide linear range from 0.32 to 1600 pg. mL –1, low limit of detection (LOD) of 0.1 pg. mL –1, high precision with relative standard deviation of 2.9%, and quantitative recoveries of 93.4–102.2% for CAP in milk, milk powder, and honey samples. This work proposes a versatile nanochannel-based platform for facile, sensitive, and precise sensing of hazardous residues in food samples.