Determination of pesticide residues in coconut tree trunks by modified QuEChERS method and ultra-high-performance liquid chromatography coupled to triple quadrupole tandem mass spectrometry

Abstract

A rapid and reliable method for the determination of 10 pesticide residues in coconut (Cocos nucifera L.) tree trunks after endotherapy treatments has been established. A modified QuEChERS (quick, easy, cheap, effective, rugged and safe) method, using an homogeneous sample slurry and acetate buffer, followed by ultra-high-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) was developed and validated. Under the best extraction conditions, the average recoveries for all pesticides spiked at 40, 80 and 200 mg kg À1 ranged from 70 to 93%, with RSD <10%. Intermediate precision expressed as RSD, ranged between 3 and 6% for all compounds. Calibration curves showed a wide linear range between 10.0 and 1000.0 mg kg À1 for all compounds studied. Limit of quantification was established as 40.0 mg kg À1 . The developed procedure was employed in the analysis of real coconut tree trunk samples obtained 45 h after pesticides application using endotherapy treatment.Concentrations of pesticides were between 44.7 AE 5 and 938.3 AE 20 mg kg À1 . These results prove the translocation of pesticides in different heights, in the coconut tree trunk, from the application point. Imidacloprid presented the highest acropetal translocation and was found near the leaves at 61 AE 6 mg kg À1 .

Analysis of the dissipation kinetics of thiophanate‐methyl and its metabolite carbendazim in apple leaves using a modified QuEChERS–UPLC–MS/MS method

“…To the best of our knowledge, little attention has been paid to fungicide dissipation in apple leaves, a non‐edible part which has no direct relation to human health. Various methods have been developed for the determination of TM and MBC in biological samples, including spectrophotographic assays (İlktaç, Aksuner, & Henden, ; Jiao et al, ), capillary electrophoresis (Picó, Rodrı́Guez, & Mañes, ), Raman imaging (Li, Sun, Pu, & Jayas, ), mass spectrometry (Yang et al, ), thin‐layer chromatography coupled with image analysis (Skowron, Zakrzewski, & Ciesielski, ), high‐performance liquid chromatography (Akkbik & Hazer, ; Sandahl, Mathiasson, & Jönsson, ; Singh, Foster, & Khan, ; Veneziano et al, ; Yu, Sun, Wang, He, & Feng, ; Zhang et al, ) and liquid chromatography–mass spectrometry (Chen et al, ; Chen et al, ; Chen, Cao, & Liu, ; Dong, Yang, Pang, & Hu, ; Dreassi et al, ; Economou, Botitsi, Antoniou, & Tsipi, ; Fernández‐Alba, Tejedor, Agüera, Contreras, & Garrido, ; Ferreira et al, ; Ferreira et al, ; Golge & Kabak, ; Morales, Ruiz, Oliva, & Barba, ; Qin et al, ; Wang & Leung, ; Wu, Chen, Li, & Fan, ; Zhang, Mei, Wang, Zhang, & Zhu, ). Among these methods, the Quick Easy Cheap Effective Rugged Safe (QuEChERS) method followed by UPLC–MS/MS detection has attracted more attention because of its satisfactory sensitivity, good selectivity and short analysis time (Bruzzoniti et al, ; Lehotay, ; Wilkowska & Biziuk, ).…”

Evaluation of a novel metal–organic framework as an adsorbent for the extraction of multiclass pesticides from coconut palm (Cocos nucifera L.): An analytical approach using matrix solid‐phase dispersion and liquid chromatography

“…Coconut palm ( Cocos nucifera L.) is one of the major perennial crops with high commercial value . In tropical countries, such as Brazil, this palm has an important role in culinary and industrial purposes . However, several factors can reduce the crop yield, such as pest infestation .…”

“…Pesticide determination in wood and wood‐based products is of considerable interest due to the problems associated with removal or recycling of wood waste, the contamination of indoor air, and manufacture of consumer products . The few methods available for the determination of pesticide residues in wood matrices are mainly based on solid–liquid extraction . Matrix solid‐phase dispersion (MSPD) is a widely employed technique in trace contaminants preconcentration due to its simplicity, minimal cost, and low consumption of reagents .…”

“…In MSPD, the adsorbent material is very important because it determines the extraction efficiency and selectivity. To date, several commercial materials , as well as different MOFs have been applied as MSPD sorbents for recovery of multiclass pesticides in various sample types. However, the recoveries of some analytes were not satisfactory in some cases.…”

Νέες Αναλυτικές Μεθοδολογίες Για Τον Έλεγχο Υπολειμμάτων Και Μεταβολιτών Φαρμακευτικών Ενώσεων Στο Θαλάσσιο Περιβάλλον Ιχθυοκαλλιεργειών

“…Για τιμές ΜΕ% μεταξύ -20% και 20% θεωρείται πως το υπόστρωμα προκαλεί ελαφριά μείωση ή ενίσχυση του σήματος και η επίδραση θεωρείται μη σημαντική. Για τιμές μεταξύ -50% και -20% ή 20% έως 50% η επίδραση θεωρείται μέτρια, ενώ για τιμές μικρότερες του -50% ή μεγαλύτερες του 50% η επίδραση θεωρείται ισχυρή (Ferreira et al, 2015).…”