Selective solid-phase extraction using molecularly imprinted polymer for the analysis of polar organophosphorus pesticides in water and soil samples

Selective Solid-Phase Extraction Using Molecularly Imprinted Polymer for Analysis of Methamidophos in Water and Soil Samples

“…Therefore, loading with water at pH 8.0, washing with 2 mL the CH 2 Cl 2 /acetonitrile (95:5, v/v) and elution with 2 mL the CH 2 Cl 2 /MeOH (90:10, v/v) was found to be the optimal MISPE protocol. Our experimental results indicate that the washing and elution conditions of MISPE for methamidophos are consistent with that of monocrotophos, 13) perhaps because there are similar properties between methamidophos and monocrotophos. …”

“…In our experiment, MIP was prepared with CH 2 Cl 2 as porogen, and this solvent was selected as the washing solvent. Acetonitrile was used once as a washing solvent to eliminate non-specific binding, [13][14][15][16] which was a suitable choice due to miscibility with dichloromethane and its moderate polarity. In this study, selective washing of non-specific adsorption was achieved using a mixture of CH 2 Cl 2 and acetonitrile.…”

“…6,12) Solid-phase extraction involving molecularly imprinted polymers (MIPs), a technique commonly referred to as molecularly imprinted solid-phase extraction (MISPE), is a popular tool capable of overcoming these disadvantages. [13][14][15] The mechanism by which these polymers specifically bind the template molecule and related ligands is attributed to the formation of functional groups in a specific arrangement within the polymer that corresponds to the template molecule and to the presence of shape-selective cavities. The fact that MIP can bind a particular analyte from a mixture of complex matrices makes MISPE a very promising technique for the development of selective extraction and accurate determination for trace analysis.…”

Quality assurance considerations in chemical analysis

“…If the MS recovery does not fall within the method acceptance criteria, it may be an indication of sample matrix interferences. However, the matrix interference may only be present in the sample used for the MS. Several examples are given in the literature concerning the use of spiked samples as control samples in pesticide analysis [9] or in pharmaceutical analysis [10].…”

Development of an indirect spectrophotometric method for determination of methamidophos insecticide in soil, water and vegetable samples

“…These include gas chromatography-mass spectrometry [5], high performance liquid chromatography [6], adsorptive stripping square wave voltammetry [7], differential pulse stripping voltammetry [8] and acetylcholine enzyme sensor [9]. Some of these methods like GC and HPLC being highly sensitive and specific, need complicated pre-treatment and clean-up steps [10] and are, therefore, unsuited for rapid assay of samples. In some cases the instrumentations employed is very expensive and can hardly be equipped due to their high setup costs and skills [5].…”