Content of the <Emphasis Type="Italic">Alternaria</Emphasis> mycotoxin tenuazonic acid in food commodities determined by a stable isotope dilution assay |
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Authors: | Stefan Asam Martina Lichtenegger Yang Liu Michael Rychlik |
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Institution: | 1.Chair of Analytical Food Chemistry,Technische Universit?t München,Freising-Weihenstephan,Germany;2.BIOANALYTIK Weihenstephan,Research Center for Nutrition and Food Sciences (ZIEL),Freising-Weihenstephan,Germany |
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Abstract: | The Alternaria mycotoxin tenuazonic acid (TA) was quantified in fruit juices (n = 50), cereals (n = 12) and spices (n = 38) using a recently developed stable isotope dilution assay (SIDA). 13 C6,15 N]-TA was used as the internal standard. Method validation revealed low limits of detection (LODs) of 0.15 μg/kg (fruit juices),
1.0 μg/kg (cereals) and 17 μg/kg (spices). The respective limits of quantitation were about three times higher. Recovery was
about 100% for all matrices. The precision (relative standard deviation of replicate analyses of naturally contaminated samples)
was 4.2% (grape juice; 1.7 μg/kg), 3.5% (whole wheat flour; 36 μg/kg) and 0.9% (curry powder; 215 μg/kg). The median content
of TA in the analyzed samples was 1.8 μg/kg (fruit juices), 16 μg/kg (cereals) and 500 μg/kg (spices). Positive samples amounted
to 86% (fruit juices), 92% (cereals) and 87% (spices). |
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