Aptamer functionalized magnetic metal–organic framework MIL-101(Cr)-NH2 for specific extraction of acetamiprid from fruit juice and water samples

An aptamer-functionalized magnetic metal-organic framework (MMIL-Apt) was prepared and used for selective magnetic solid phase extraction (MSPE) of acetamiprid. To examine the morphology of the adsorbent, different techniques such as FT-IR spectrometry, vibrating sample magnetometery, TEM, FE-SEM and EDS were employed. The MMIL-Apt combines the advantages of aptamers and magnetic MMIL-101(Cr)-NH2 such as specific recognition of analyte, good stability and fast separation. To reach high MSPE recovery, various extraction parameters were examined and optimized. The limit of detection (LOD) was reached 0.0018 μg L-1. This method showed perfect linearity (0.006-1800 μg L-1) with a good correlation coefficient (R2 = 0.9993). The relative standard deviations for intra- and inter-day analyses were 3.61% and 8.10%. The extraction recoveries in water samples and fruit juices were obtained from 80.20% to 101.81 %. The results indicated the modified sorbent is practically applicable for the specific extraction of trace amounts of acetamiprid from different matrices.