Synthesis of core‐shell magnetic molecularly imprinted polymer for the selective determination of imidacloprid in apple samples

Abstract

This work demonstrates the synthesis and characterization of core-shell magnetic molecularly imprinted polymers based on surface imprinting using methacryloyl chloride as a functional monomer for the selective extraction of imidacloprid (template) from apple fruit. The characterization analysis results ensured the successful synthesis of the magnetic molecularly imprinted polymers owing to their heterogeneous structure and good magnetic properties. An isothermal binding test was assessed with a pseudo-second-order kinetic model, and the kinetic results fit well to the Freundlich isothermal model. The polymers exhibited an adsorption capacity of 5.75 mg/g for the target analyte with a good selective extraction ability. In addition, the polymers can be reused several times without significant performance loss. The molecularly imprinted polymers showed good performance in the analysis of spiked apple sample with a linear range of 0.05-1.0 mg/L, a limit of detection of 0.048 mg/L and a limit of quantification of 0.146 mg/L (S/N = 3/10). The recoveries of the samples were 77.66-96.57% and their respective relative standard deviations were 3.36-0.45%. All the results indicated that the proposed method provided good selective extraction, as qualifying the analytical standards. K E Y W O R D Sadsorption isotherms, apple, imidacloprid, insecticides, molecularly imprinted polymers Recently, several analytical methods have been used for pesticide detection. Among these, SPE, SPME, SFE, and LPME are the most prominent. These methods are

Highly ordered molecularly imprinted mesoporous silica for selective removal of bisphenol A from wastewater

“…For the BPA concentrations of 10, 60, and 800 mg/L, the time to reach equilibrium was 5, 15, and 25 min, respectively. The results demonstrated the BIMS showed a fast kinetic binding and the equilibrium adsorption time is much faster than traditional MIPs . The results can be attributed to the fact that the nano‐sized imprinting matrix and large pore size of the mesoporous silica allowed easier access of BPA to the binding sites.…”

Imprinting Technology for Effective Sorbent Fabrication: Current State-of-Art and Future Prospects

“…The molecularly imprinted sorbents were utilized in the food analysis for determination of antibiotics such as norfloxacin [121] or cephalexin in pork [122], tetracycline in chicken [123], aminoglycosides (streptomycin, kanamycin, and gentamycin) in various milk samples [124], chloramphenicol in honey [125], zearalenone in wheat [126], estrogens (estrone, estriol, and estragon) in milk [127] or in cucumber, milk powder and grass carp samples [128], sulfonamides such as sulfamethoxazole in milk [129], imidacloprid [130] or kaempherol in apples [131], patulin in apple juice [132], hesperidin in lime juice [133], strobilurin in peach [134], carbendazim in orange [135], dopamine in bananas [136], fenoxycarb in mussels [137], phenylarsonic compounds in chicken and pork samples [138], or organochlorine fungicides in ginseng samples [139], acrylamide in biscuits [140], bisphenoles A [141] as well as F and S (on imprinted commercial sorbent-Affinimip ® ) [142], and quercetin in onion [143]. The imprinted sorbents were also used for selective extraction of plant ingredients, such as rosmarinic acid from Rosmarinus officinalis L. [144], tannins from the barks of Anadenanthera macrocarpa var.…”

Sensitive and selective determination of imidacloprid with magnetic molecularly imprinted polymer by using LC/Q-TOF/MS

“…In MMIPs, the advantages of MIP are preserved, and at the same time, they possess high specific surface area and excellent magnetic properties which can increase the efficiency and eliminate the time consuming step of separating the polymer from the complex sample using an external magnet [38,39]. Determination of imidacloprid based on different types of MIPs with various techniques and different components were presented in the literature [40][41][42]. In this study, MMIPs have been used for the preconcentration of trace levels of imidacloprid prior to the chromatographic separation and highly sensitive mass spectrometric detection.…”