Determination of selected mycotoxins in mould cheeses with liquid chromatography coupled to tandem with mass spectrometry.
A simple and feasible method is described for analysing nine mycotoxins in cheese matrix. The method involves liquid extraction followed by high performance liquid chromatographic separation and mass spectrometric detection of the analytes, and allows the determination of aflatoxins B1, B2, G1, G2 and M1, ochratoxin A, mycophenolic acid, penicillic acid and roquefortine C simultaneously. Average recoveries of the mycotoxins from spiked samples at concentration levels of 5-200 microg kg(-1) ranged from 96-143%. Within-day relative standard deviations at these concentration levels varied from 2.3-12.1%. The limit of quantification for aflatoxin M1 was 0.6 microg kg(-1) and for the other compounds 5 microg kg(-1). The method developed was applied for analysing these mycotoxins in blue and white mould cheeses purchased from Finnish supermarkets. Roquefortine C was detected in all of the blue mould cheese samples in concentrations of 0.8-12 mg kg(-1). One blue cheese contained also 0.3 mg kg(-1) mycophenolic acid. The other investigated mycotoxins were absent in the samples.
Kokkonen
Meri
M
National Veterinary and Food Research Institute, Helsinki, Finland. meri.kokkonen@eela.fi
Jestoi
Marika
M
Rizzo
Aldo
A
D016604:Aflatoxin B1 / Q000032:analysis; D016607:Aflatoxin M1 / Q000032:analysis; D000348:Aflatoxins / Q000032:analysis; D002611:Cheese / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005387:Finland; D005506:Food Contamination / Q000032:analysis; D006576:Heterocyclic Compounds, 4 or More Rings / Q000032:analysis; D007211:Indoles / Q000032:analysis; D013058:Mass Spectrometry / Q000379:methods; D009173:Mycophenolic Acid / Q000032:analysis; D009183:Mycotoxins / Q000032:analysis*; D009793:Ochratoxins / Q000032:analysis; D010398:Penicillic Acid / Q000032:analysis; D010879:Piperazines / Q000032:analysis
D000348:Aflatoxins; D006576:Heterocyclic Compounds, 4 or More Rings; D007211:Indoles; D009183:Mycotoxins; D009793:Ochratoxins; D010879:Piperazines; C025589:ochratoxin A; C027955:aflatoxin G1; C029754:aflatoxin G2; C012536:roquefortine; D016607:Aflatoxin M1; C029753:aflatoxin B2; D016604:Aflatoxin B1; D009173:Mycophenolic Acid; D010398:Penicillic Acid