Determination of Methomyl Residues in Bohe by Ultrahigh-Performance Liquid Chromatography-Tandem Mass Spectrometry (UPLC-MS)

Abstract

The aim of this work is to investigate the presence of methomyl pesticide residue and the rate of disappearance in mint cultivated in the aquaponics system based on the application of UPLC-MS to establish a safety time interval before crop harvesting. Results showed that an effective and sensitive method based on UPLC-MS has been used for the determination of methomyl pesticide residues in mint. The initial residue level was much higher in roots (79.52 μg/kg), and it can be decreased to 16.73 (after 15 days) μg/kg and 3.31 (20 days) μg/kg, while the least was detected on the mix leaves and stems (44.54 μg/kg), and it can be decreased to 15.35 (after 20 days). In our case, we suggest that a safety interval in the range of 15–20 days should be allowed after the detection of methomyl in water, and the concentration of methomyl was lower than the acceptable daily intake (ADI) of the China Food and Drug Administration (CFDA) (20 μg/kg).

Effect of Methomyl on Growth, Antioxidant System of GIFT (Oreochromis niloticus), and Residue in the Presence of Water Spinach (Ipomoea aquatica Forsk)

“…Supervised residue data from trials in several other countries showed that MET residues were detected on most above-ground crops at the time of harvest [6]. Higher residues occurred on leafy vegetables, for example, lettuce, spinach, celery, and cabbage, with generally low levels on root crops, cucurbits, and grain crops.…”

“…e LC 50 values for crucian carp ranged from 0.9 to 3.4 mg/L, and the LC 50 values for Daphina magna were from 0.022 to 0.026 mg/L [3]. Previous studies were conducted on the e ects of MET pesticides on several sh species such as Channa striatus [4] and tilapia (Oreochromis niloticus [5,6]. e results showed that there were signi cant changes in antioxidant activities and contents in serum (increases in GST, GR, GPx, and GSSG accompanied by a decrease in GSH were observed following MET exposure to 2, 20, or 200 μg/L).…”

“…Water spinach (Ipomoea aquatica) is one of the effective aquatic plants that is used for heavy metal removal from water. We constructed the determination method for MET in plants [6], and this plant shows significant nutrient removal [7,8], antioxidant activities [9], and immune effects [10]. However, limited information on the capability of the genus Ipomoea as a part of the biofilter is documented.…”

“…us, reactive oxygen species (ROS) induced in aquatic ecosystems through pollutants can be evaluated via antioxidant enzyme activity measurement and could be excellent biomarkers [11]. Genetically improved farmed tilapia (GIFT) is suitable for culture in warm waters, but is sensitive to aquatic environmental factors [5,6]. e present study aims to investigate nutrient removal and water quality of tilapia wastewater using water spinach as a floating bed; to know the effect of a chronic sublethal dose of MET on growth performance (BWG, SGR, and FCR) of GIFT; and to investigate the effect of a chronic sublethal dose of MET on antioxidant enzyme activities (SOD, CAT, GPx) and GSH content in the liver of GIFT.…”

Method validation for detection of afidopyropen and M440I007 in tea

“…Choosing an appropriate SPE cartridge was crucial with respect to sample preparation. A Cleanert TPT column was designed as a mixed mode multilayer SPE cartridge composed of amide‐modified polystyrene, graphitized carbon black and polyamine silica, which has been widely used in complex samples 19‐21,29 . It was demonstrated that Cleanert TPT cartridge has made great improvements compared to C18, amino and Florisil SPE cartridges with respect to removing the tea co‐extractives 21 .…”