title: Determination of methiocarb and its degradation products, methiocarb sulfoxide and methiocarb sulfone, in bananas using QuEChERS extraction.
abstract: The present work describes the development of an analytical method for the determination of methiocarb and its degradation products (methiocarb sulfoxide and methiocarb sulfone) in banana samples, using the QuEChERS (quick, easy, cheap, effective, rugged, and safe) procedure followed by liquid chromatography coupled to photodiode array detector (LC-PAD). Calibration curves were linear in the range of 0.5-10 mg L⁻¹ for all compounds studied. The average recoveries, measured at 0.1 mg kg⁻¹ wet weight, were 92.0 (RSD = 1.8%, n = 3), 84.0 (RSD = 3.9%, n = 3), and 95.2% (RSD = 1.9%, n = 3) for methiocarb sulfoxide, methiocarb sulfone, and methiocarb, respectively. Banana samples treated with methiocarb were collected from an experimental field. The developed method was applied to the analysis of 24 samples (peel and pulp) and to 5 banana pulp samples. Generally, the highest levels were found for methiocarb sulfoxide and methiocarb. Methiocarb sulfone levels were below the limit of quantification, except in one sample (not detected).
authors.affiliation: REQUIMTE, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida 431, 4200-072 Porto, Portugal.
authors.forename: Alexandra
authors.initials: A
authors.lastname: Plácido
authors.forename: Paula
authors.initials: P
authors.lastname: Paíga
authors.forename: David H
authors.initials: DH
authors.lastname: Lopes
authors.forename: Manuela
authors.initials: M
authors.lastname: Correia
authors.forename: Cristina
authors.initials: C
authors.lastname: Delerue-Matos
mesh_terms: D004355:Drug Stability; D005506:Food Contamination; D005513:Food Inspection / Q000379:methods*; D005638:Fruit / Q000737:chemistry*; D007306:Insecticides / Q000032:analysis*; D008714:Methiocarb / Q000031:analogs & derivatives / Q000032:analysis*; D008975:Molluscacides / Q000032:analysis*; D028521:Musa / Q000737:chemistry*; D011174:Portugal; D013450:Sulfones / Q000032:analysis
chemical_list: D007306:Insecticides; D008975:Molluscacides; D013450:Sulfones; D008714:Methiocarb; C097911:methiocarb sulfoxide