Determination of Phenylureas Herbicides in Foodstuffs Based on Matrix Solid-Phase Dispersion Extraction and RP-LC with UV Detection

Abstract

A new method for simultaneous determination of seven kinds of phenylurea herbicides (PUHs) in solid foodstuffs was established based on matrix solid phase dispersion (MSPD)-RP-LC. The procedure of MSPD is simple and not time-consuming. C 18 -bonded silica and anhydrous alumina were, respectively, used as dispersion sorbent and purificant, and dichloromethane as extraction reagent. Under the optimum conditions, seven kinds of herbicides were separated completely within 30 min, response was a linear function of concentration over the range 2.5-500 lg L -1 with good correlation coefficients ([0.99) and lower detection limits (0.25 and 0.5 lg L -1 ). Intra-day and inter-day precision of the peak areas for seven PUHs were less than 3.7 and 5.3%. The new method was used to detect seven PUHs in four kinds of solid foodstuffs with average recoveries range from 73.1 to 101%.

Sol–gel-based silver nanoparticles-doped silica – Polydiphenylamine nanocomposite for micro-solid-phase extraction

“…Among these methods, µ-SPE is a suitable technique that could be applicable to a range of different matrixes, such as wastewater, biological fluids and sewage sludge [23,24]. The use of adsorbents with different shape, size and hydrophobic and hydrophilic properties, the µ-SPE may be used to selectively adsorb some specific compounds [19]. The recent µ-SPE applications has shown to be an effective way to reduce solvent consumption, extraction time, sorbents amount and …”

“…There is therefore a growing need to introduce and develop new, sensitive, reproducible and rapid methods for monitoring of pesticide residues in surface water samples at trace levels. Numerous methods such as dispersive micro-solid phase extraction [15], membrane-assisted solvent extraction [16], microwave-micro solid phase extraction [17], stir bar sorptive extraction [18], matrix solid phase dispersion [19], vortex-assistedbased demulsified dispersive LLME [20] and direct immersion or headspace solid phase micro extraction [21,22], have been reported for determination of trace residues and contaminants in water samples. Among these methods, µ-SPE is a suitable technique that could be applicable to a range of different matrixes, such as wastewater, biological fluids and sewage sludge [23,24].…”

Residue investigation of some phenylureas and tebuthiuron herbicides in vegetables by ultra‐performance liquid chromatography coupled with integrated selective accelerated solvent extraction–clean up in situ

“…A high‐performance high chromatography–fluorescence detection (HPLC–FLD) method was developed for the simultaneous determination of some PhUs in rice and corn samples using UV decomposition and post‐column derivatization, and using post‐column photochemically induced fluorimetry derivatization . A reverse‐phase LC with UV detection was used for the determination of PhUs in foodstuffs based on matrix solid‐phase dispersion extraction . An HPLC‐UV method was utilized for determination of PhUs in plant material using immunoaffinity chromatography (IAC) as a simplified clean‐up technique .…”

“…The QuEChERS (which stands for quick, easy, cheap, effective, rugged and safe) method is a selective and sensitive procedure for the analysis of pesticide residues in fruits and vegetables, but too many chemicals and solvents were required. Matrix solid‐phase dispersion (MSPD) has many advantages such as simple operation, high recovery rate, and less sample loss and solvent consumption, but the exploration and utilization of MSPD for the extraction of PhUs from solid foodstuffs have seldom been reported . Accelerated solvent extraction (ASE) is an automated extraction technique that uses conventional liquid solvents at high temperature and high pressure to extract compounds from solid samples, with the advantages of good recovery, rapidity and adequate precision, as well as less solvent use .…”

“…11 A reverse-phase LC with UV detection was used for the determination of PhUs in foodstuffs based on matrix solid-phase dispersion extraction. 12 An HPLC-UV method was utilized for determination of PhUs in plant material using immunoaffinity chromatography (IAC) as a simplified clean-up technique. 13 An LC-UV method was applied for screening of PhUs directly from vegetable sample extracts.…”