Determination of cyromazine and melamine in chicken eggs using quick, easy, cheap, effective, rugged and safe (QuEChERS) extraction coupled with liquid chromatography–tandem mass spectrometry

A sensitive and efficient method for routine pesticide multiresidue analysis in bee pollen samples using gas and liquid chromatography coupled to tandem mass spectrometry

“…The volume of acetonitrile and water was evaluated based on the supernatant volume, over 4 mL in this first step. To minimize the co-extraction of lipids and proteins, the use of acetonitrile has the advantage of being able to precipitate proteins [28,29] and limit lipid solubility [17,30]. It was reported that proteins are denatured in pure acetonitrile or aqueous-acetonitrile mixtures [28,31], which would cause the unfolding of protein and the release of binding pesticides thus increasing the extraction efficiency of certain pesticides from the pollen samples.…”

Determination of methenamine residues in edible animal tissues by HPLC-MS/MS using a modified QuEChERS method: Validation and pilot survey in actual samples

“…PSA sorbent can remove various organic acids, sugars and fatty acids (Walorczyk, 2014). C 18 sorbent is often used for trapping and removing lipids from the samples (Wang, Lee, Chen, Chou, & Lee, 2012). Therefore, optimum dosages of sorbents (25.0 mg, 50.0 mg, 75.0 mg, 100.0 mg, 150.0 mg and 200.0 mg) were investigated.…”

Dissipation kinetics and residues of triazolopyrimidine herbicides flumetsulam and florasulam in corn ecosystem

“…3 revealed that the amount of GCB from 0 to 20 mg and C18 from 20 to 100 mg showed no significant effects on recoveries, but for PSA in the range of 0-40 mg in soil matrix, the recoveries decreased dramatically. Flumetsulam and florasulam, both containing amine group, can interact with PSA, characterized by ethylenediamine group, through hydrogen bonding (Wang et al 2012). Therefore, GCB and C18 were used for extraction.…”