Organophosphorus Pesticide Residues in Mexican Commercial Pasteurized Milk

Abstract

A study was conducted to measure residues of 13 organophosphorus (OP) pesticides, widely used as dairy cattle ectoparasiticides or in crops used for animal feed, in homogenized and pasteurized Mexican milk samples. Four different milk brands with high distribution were collected biweekly during a 12 month period (n = 96) in supermarkets. OP pesticide residues were measured by gas chromatography with a flame photometric detector. Approximately 39.6% of the samples contained detectable levels of OP pesticide residues. Eight samples contained residues exceeding established maximum residue limits (MRL), and the OP pesticides present in these samples were dichlorvos (five samples), phorate, chlorpyrifos, and chlorfenvinphos (one sample, respectively). Average residues of 13 OP pesticides measured were below established MRLs ranging between 0.0051 and 0.0203 ppm.

The Diagnostic Approach and Public Health Implications of Phorate Poisoning In a California Dairy Herd

“…While multiple bulk tank milk samples were collected for several days after the incident, no additional testing was performed after the initial milk sample from Day 1 was negative for phorate. The limit of detection of 10 ng/ml is similar to but below a recently reported detection limit of 14 ng/ml for phorate in milk [18]. The lack of detection of phorate in the bulk tank milk sample from Day 1 may be because mixing of phorate-contaminated with negative milk samples diluted the final phorateconcentration below the method detection limit.…”

“…There are very few studies that focus on the detection of phorate and its metabolites in edible tissue of animal origin even though there is risk to humans for low level exposure to phorate through the food supply [14][15][16][17][18]. In the reported mortality event on the dairy, a bulk milk tank sample was collected on Day 1 and found to be negative for phorate at a limit of detection of 10 ng/ml.…”

Bazı Sık Kullanılan Organofosfatlı Pestisitlerin Anne Sütünde Kalıntılarının Belirlenmesi

“…Due to the high toxicity of dichlorvos, the presence of this pesticide residue in milk, the main food of children, is of particular importance, and this issue has been emphasized for the protection of children. 42 In our present study, dichlorvos residue was detected in breast milk samples in quantities ranging between 0.02 and 0.33μg/kg. As it was detected in breast milk, which is the best food source of babies during the initial 6 months of life, its presence is noteworthy regardless of the quantity.…”

Estado Actual De La Investigación Sobre Plaguicidas en México

“…De acuerdo con Schettino et al (2013), las concentraciones de OC en leche de cabra de granjas del centro del país, no representan un riesgo para los consumidores. En un estudio realizado por Salas et al (2003) con leche de vaca comercial, se identificó que cerca del 40 % de las muestras presentaron residuos de OF y 8 % presentaron concentraciones mayores a los límites máximos permitidos, principalmente diclorvos.…”