Comparison of three methods for detection of herbal food supplement irradiation |
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Authors: | Torben Leth Hanne Boskov Hansen Flemming Boisen |
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Affiliation: | (1) Department of Food Chemistry, Danish Institute for Food and Veterinary Research, Mørkhøj Bygade 19, DK 2860 Søborg, Denmark;(2) Danish Veterinary and Food Administration, Mørkhøj Bygade 19, DK 2860 Søborg, Denmark;(3) Fyn Regional Laboratory, Lille Tornbjergs Vej 24b, DK 5220 Odense SØ, Denmark |
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Abstract: | A survey for irradiation of 106 herbal food supplements was carried out in Denmark in 2003. The results from three methods, two screening methods and a specific method, were compared: Direct epifluorescent filter technique/aerobic plate count (DEFT/APC), photostimulated luminescence (PSL) and thermoluminescence (TL) standardised by Comité Européen de Normalisation (CEN). Forty samples screened positive with the DEFT/APC method. However, the TL method could only confirm irradiation of 15 samples, 11 samples wholly irradiated and 4 samples with a minor irradiated ingredient. Thus, the DEFT/APC method gave a large number of false positive results, although the number of false negative results probably was very low. Only 7 of the 15 confirmed irradiated samples screened positive with the PSL screening method, the samples with low photon counts escaping detection. For 10% of the samples also the TL method was lacking in sensitivity, as not enough minerals could be isolated to get a signal over the minimum detection level. For such clean herbal food supplements no suitable method exists at all among the CEN standardised methods for irradiation detection. |
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Keywords: | Irradiation Herbal food supplements Food irradiation detection Thermoluminescence DEFT/APC Photostimulated luminescence |
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