Residue patterns of buprofezin and teflubenzuron in treated peaches

Abstract

The biological half-life and final residue levels of buprofezin and teflubenzuron were examined in peaches over a 14-day cultivation period. The residue levels of buprofezin and teflubenzuron were analyzed by chromatographic method with recovery ranging from 84.0% to 96.6%. The biological half-lives of buprofezin and teflubenzuron were 4.88 and 11.49 days at the standard dose, and 4.40 and 10.86 days at a triple dose, respectively. The initial concentration of buprofezin exceeded the maximum residue limit (MRL) set in Korea, but the concentration decreased to below the MRL within 6 days after application. The initial and persisting concentrations of teflubenzuron were all below the prescribed MRL. The final residue levels of buprofezin and teflubenzuron were 0.17 and 0.10 mg•kg −1 following a standard single dose, and 0.20 and 0.23 mg•kg −1 following a triple dose, respectively. The final residue levels of buprofezin and teflubenzuron were also compared with the good agricultural practices standards of the United States and Italy.

Buprofezin dissipation and safety assessment in open field cabbage and cauliflower using GC/ITMS employing an analyte protectant

“…Another factor that influences the dissipation of buprofezin might be the coarse surface of the cauliflower that allows more attraction and persistence of the pesticide. Yoon, Park, Han and Lee () reported the t 1/2 to be 4.88 and 4.4 days in peaches at application rates of 400 and 1200 g a.i. h −1 , respectively (Yoon et al, ).…”

“…Yoon, Park, Han and Lee () reported the t 1/2 to be 4.88 and 4.4 days in peaches at application rates of 400 and 1200 g a.i. h −1 , respectively (Yoon et al, ). Oulkar et al () reported that residues of buprofezin in grapes dissipated following a nonlinear two‐compartment first + first‐order kinetics, with the t 1/2 determined at 3 days at single and double application rates of 312.5 and 625 g a.i.…”

Residual determination and risk assessment of buprofezin in plum (Prunus domestica) grown in open‐field conditions following the application of three different formulations

“…From an analytical point of view, buprofezin (as a single analyte) has been extracted with acetone from hulled rice and fruits (including apple, pear, and persimmon) and then purified using liquid–liquid partitioning and Florisil column chromatography before being analyzed using high‐pressure liquid chromatography (HPLC) coupled with an ultraviolet detector (UVD) or mass spectrometer (MS) for confirmation (Lee and Jang, ). Using multiresidue analysis, Yoon et al ., () estimated the biological half‐life and final residue levels of buprofezin and teflubenzuron in peaches over a 14‐day cultivation period using a gas chromatography–electron capture detector. In this study, the samples are extracted with acetone, partitioned with n ‐hexane, and purified using Florisil SPE.…”