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

Raif İlktaç,Zinar Pınar Gümüş

doi:10.3906/kim-2101-36

Abstract

In this paper, magnetic-molecularly imprinted polymer was used for the preconcentration of trace levels of imidacloprid in water and apple samples prior to liquid chromatography-quadrupole-time-of-flight mass spectrometric determination. The selectivity of the magnetic polymer was united with the sensitivity and the high resolving power of the chromatographic system. The developed method showed a linear range from 10.0 to 500.0 µg/L. The quantitative recoveries were obtained for water and apple samples in the range of 92.0%–99.0 %. The relative standard deviations of intra-day and inter-day tests were found to be in the range of 0.8%–1.2% and 1.2%–1.6 %, respectively. In addition, the same magnetic-molecularly imprinted polymer (MMIP) can be used at least ten cycles for the determination of imidacloprid. The preconcentration factor of the method was found to be 2.5, and the total preconcentration procedure can be completed in 1 h. Characterization of synthesised particles were executed with various techniques. Due to its suitable limit of detection, dynamic linear range, sensitivity and selectivity, the developed method seemed to be ideal for the determination and preconcentration of imidacloprid in water and fruit samples.

Highlights

Imidacloprid [1-(6-chloro-3-pyridylmethyl)-N- nitroimidazolodin-2-ylideneamine] is a systemic neonicotinoid insecticide, which acts as an insect neurotoxin on the central nervous system of insects [1]
The method was applied to tap water and apple samples, and the results demonstrated that the developed method for recovery of imidacloprid was a promising tool and will shed light on methodological evaluations for the detection of imidacloprid in real samples
Characterization studies Characterization of molecularly imprinted polymer (MMIP) were performed with FTIR, SEM-EDX and vibrating sample magnetometer (VSM) analysis

Summary

Introduction

Imidacloprid [1-(6-chloro-3-pyridylmethyl)-N- nitroimidazolodin-2-ylideneamine] is a systemic neonicotinoid insecticide, which acts as an insect neurotoxin on the central nervous system of insects [1]. Imidacloprid has been widely used in various types of fruits and vegetables in agriculture and in forestry. Imidacloprid is absorbed by plant roots and can be transported through all plant organelles [3,4]. As a result of its widespread usage in agricultural applications, the residue of imidacloprid in ground and/or surface waters, soil and food products become an important hazard to human health [5,6,7,8]. The effect of imidacloprid on food and aquatic environment is more important today than ever before

Objectives

Results

Conclusion