Thioprolines formed by reacting cysteine with reactive carbonyls have been demonstrated to possess antitumor, antioxidative, and hepatoprotective properties. Using our developed QuEChERS sample preparation in combination a liquid chromatography–tandem mass spectrometry coupled stable isotope-dilution method, we identified quantitated 2-methylthioproline (1) 2-methylthioprolinylglycine (2) grape...

Liquid chromatography - high resolution mass spectrometry (LC-HRMS) developed to screen some residues in rice. Pesticides, aflatoxin B1, B2, G1, aflatoxin G2 and quaternary ammonium surfactants were detected by the optimized method. Rice samples extracted cleaned QuEChERS then analyzed QExactive system with HESI ionization source for both negative positive modes. The&...

A modified-QuEChERS method to determine kresoxim-methyl in banana and soil was developed validated via high-performance liquid chromatography–tandem mass spectrometry (HPLC-MS/MS). The dissipation behavior, residue distribution, risk assessment of were further investigated based on this method. behavior described by using first-order kinetics its half-life, 4.8–5.7 days 5.5–6.5 days, respective...

This paper describes the use of a quick, easy, cheap, effective, rugged, and safe (QuEChERS) method for extraction and cleanup of 16 pesticide residues of interest in olives and olive oil. These products contain a high lipid content, which can adversely affect pesticide recoveries and harm traditional chromatographic systems. For extraction, the main factors (oil and water content) were studied...

Article history: Received 26 January 2014 Received in revised form 10 March 2014 Accepted 12 March 2014 Available online 5 April 2014