School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, China.
Central Laboratory, Tongliao Agricultural and animal Products Quality Safety Center, Tongliao, China.
Chirality. 2018 Dec;30(12):1321-1329. doi: 10.1002/chir.23029. Epub 2018 Oct 30.
In this study, magnetic multiwalled carbon nanotubes (MMWCNTs) were synthesized and used as adsorbent for preconcentration of chiral pesticide residues (including epoxiconazole, tebuconazole, and metalaxyl) in lettuce, cabbage, and apple. Several parameters affecting the treatment efficiency were investigated, including extraction solvent and absorption solvent. Under the optimal conditions, all three chiral pesticides showed decent enantiomeric separation (Rs > 1.48). The linearity of each target was good with the correlation coefficient (r ) being greater than 0.9923. The average recoveries of the three spiked levels were 73.4% to 110.9% with repeatability (RSD ) less than 7.6%, and the limit of quantification of the method was 0.10 to 0.25 mg·kg . The results indicated that MMWCNTs had a good purifying effect, which can be applied as an effective pretreatment tool for the determination of residual chiral pesticides in fruits and vegetables.
本研究合成了磁性多壁碳纳米管（MMWCNTs），并将其用作吸附剂，用于从生菜、白菜和苹果中预浓缩手性农药残留（包括环氧菌唑、戊唑醇和甲霜灵）。研究了影响处理效率的几个参数，包括萃取溶剂和吸收溶剂。在最佳条件下，三种手性农药均表现出较好的对映体分离（Rs＞1.48）。每个目标物的线性关系都很好，相关系数（r）大于 0.9923。三种添加水平的平均回收率为 73.4%至 110.9%，重复性（RSD）小于 7.6%，方法的定量限为 0.10 至 0.25 mg·kg-1。结果表明，MMWCNTs 具有良好的净化效果，可作为测定水果和蔬菜中残留手性农药的有效预处理工具。
