title: Determination of pesticides in apple-based infant foods using liquid chromatography electrospray ionization tandem mass spectrometry.
abstract: A liquid chromatography electrospray ionization tandem mass spectrometry (LC/ESI-MS/MS) method was developed and validated to quantify and confirm trace levels of 13 pesticides including aldicarb sulfoxide, aldicarb sulfone, oxamyl, methomyl, formetanate, 3-hydroxycarbofuran, carbendazim, thiabendazole, aldicarb, propoxur, carbofuran, carbaryl, and methiocarb in apple-based infant foods such as apple sauces, apples and strawberries, apples and blueberries, and apples and plums. Data acquisition under MS/MS was achieved by applying multiple reaction monitoring of two fragment ion transitions to provide a high degree of sensitivity and selectivity for both quantification and confirmation. LC/ESI-MS/MS quantitative results were significantly affected by matrices, and thus, the standard addition was employed to compensate for the matrix effects to achieve the best accuracy of the method. Recoveries of 13 pesticides, spiked at 5.0, 25.0, and 45.0 microg/kg, were around 100% using the LC/ESI-MS/MS standard addition. The method detection limits (S/N > or = 3:1) of 13 pesticides were less than 0.2 microg/kg.
authors.affiliation: Canadian Food Inspection Agency, Calgary Laboratory, 3650 36th Street N.W., Calgary, Alberta, Canada T2L 2L1.
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Wendy
authors.initials: W
authors.lastname: Cheung
authors.forename: Donna
authors.initials: D
authors.lastname: Grant
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D005638:Fruit / Q000737:chemistry*; D006801:Humans; D007223:Infant; D007225:Infant Food / Q000032:analysis*; D027845:Malus / Q000737:chemistry*; D010575:Pesticides / Q000032:analysis*; D011786:Quality Control; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D010575:Pesticides