A fast and simple modified QuEChERS (quick, easy, cheap, rugged and safe) extraction method based on spiked calibration curves and direct sample introduction was developed for determination of benzo[a]pyrene (BaP) in bread by gas chromatography-mass spectrometry single quadrupole selected ion monitoring (GC/MS-SQ-SIM). Sample preparation includes extraction of BaP into acetone followed by clean...

Abstract Background The quick, easy, cheap, effective, rugged, and safe (QuEChERS) method can be employed for multi-residue analyses instead of traditional extraction methods due to its advantages in terms time required equipment. A modified version the QuEChERS has been developed quantifying eight pharmaceuticals belonging different classes three real soils with chemical properties. Firstly, h...

Method verification is an internal quality control procedure verifying the suitability of method for specific purposes. All methods should be verified prior to analyses real samples. LOQ, range linearity, precision, accuracy and recovery criteria have taken into consideration while performing verification. This study was conducted verify QuEChERS analysis boscalid, chlorpyrifos tebuconazole in ...

This study provides a review of methods used in the determination organochlorine pesticides (OCPs) ginseng and compares effectiveness three extraction (Quick, Easy, Cheap, Effective, Rugged, Safe (QuEChERS), modified QuEChERS Fast Pesticide Extraction (FaPEx)) analyses 20 OCPs root samples. For each method, sample mass, solvent volume sorbent mass were varied to identify optimum combination eff...

Organochlorine pesticides were tested in order to establish optimal conditions for rapid detection in dried leafy matrices, using DRS software. In tests we have used dried Trifolium pratense herba fortified with OC pesticide mix, processed with modified QuEChERS method. Instrumental analysis was carried out complying Agilent "key" condition, column of 15 m, in which case the retention time for ...

A method using QuEChERS sample preparation and an Agilent 6490 Triple Quadrupole LC/MS has been developed that provides rapid and sub-parts per billion (ppb) detection of synthetic yohimbine and yohimbe bark extract in dietary supplements. Using the chromatographic separation of the diastereomers of yohimbine, the synthetic compound can be distinguished from the tree bark extract. An Agilent 65...

The aim of this analytical study was to develop and validate an easy-to-use method for measuring the actual level of norflurazon that accumulates in leaves. We amended the QuEChERS method, i.e. Quick, Easy, Cheap, Effective, Rugged, and Safe, which is widely used for pesticide and herbicide analysis in food, and usually combined with HPLC-MS detection. We adapted this method for the detection o...

In this study, a QuEChERS method and gas chromatography coupled with time-of-flight mass spectrometry (GC×GCTOFMS) was developed for rapid extraction and simultaneous determination of 12 pesticide residues in honey. The GC×GC-TOFMS method was validated according to the SANCO guidance in terms of linearity, selectivity, reproducibility and recovery. Regarding the results, recovery rates ranged b...