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Development and validation of a HPLC method for the quantitation of ochratoxins in plasma and raw milk

2006; Elsevier BV; Volume: 843; Issue: 2 Linguagem: Inglês

10.1016/j.jchromb.2006.06.018

1873-376X

Hamid Boudra, Diego Morgavi,

Meat and Animal Product Quality

A HPLC method with improved sensitivity for the determination of ochratoxins (OT) A, B and α in plasma and milk was developed. Plasma analysis involved a simple liquid–liquid extraction with chloroform; while for milk, an additional immunoaffinity clean-up step was necessary. The method showed a good linearity (r2 > 0.999). The limit of quantification (LOQ) of OTA was 5 and 200 ng/l for milk and plasma, respectively. Average recovery was 89% in both matrices, except for OTα in milk that was only 18% due to poor immunoaffinity binding. OT remained stable in −20 °C stored samples; OTA concentration in plasma and milk did not change after 8 and 18 months of storage, respectively. The developed method has been applied to contaminated plasma and milk samples obtained from dairy ewes fed with ochratoxin-contaminated feed.