Determination of pesticides residues in quinoa (Chenopodium quinoa Willd) using QuEChERS and LC-MS/MS

Abstract

The QuEChERS method was optimized and validated for the determination of 40 pesticides in 37 samples of quinoa from the harvest 2010-2011 in Puno - Peru. The method involves extraction with 1% acetic acid acetonitrile with CH3COONa anhydrous and MgSO4 followed by dispersive solid-phase extraction with PSA and C18. Analyses were performed with LC-MS/MS using C18 column 150 mm x 2.1 x 3.5 µm, water and acetonitrile 0.1% formic acid used as mobile phase. Spiked quinoa blank at 0.01 and 0.1 mg kg-1 was employed to evaluate recovery ranging from the 31.6 and 125.1% with RSD ≤ 23. The method showed linearity r2 ≥ 0.99 and limits of quantification ranged from 0.001 and 0.01 mg kg-1, and was not observed a matrix effects. No pesticides residues were observed in the analyzed samples.

Identification of Biochemical Composition and Pesticides Residue in Ten Rose Cultivars Leaves Using FT-IR Spectroscopy

“…compounds in food products, flowers, fruits and vegetables (Vilca et al 2018). Lentola et al (2017) showed that many ornamental plants are also treated with systemic pesticides prior to purchase and there is little information as to whether these pesticides persist in plant tissues long enough to contaminate pollen during flowering after purchase.…”