Evaluation of the black light test for screening aflatoxin- contaminated maize in the Brazilian food industry
GLORIA, E.M., FONSECA, H., CALORIDOMINGUES, M.A. and SOUZA, I.M.
Food Additives and Contaminants 15 : 181-184.
1998
บทคัดย่อ
The results of the black light test for aflatoxin contaminated maize carried out in a large food factory in the State of Sao Paulo, Brasil, was evaluated against bi-directional TLC analysis. All 286 samples were accepted by the black light test (7 fluorescent points), however, the results from TLC analysis showed that 96 samples were contaminated and 14 showed AFB1 contamination levels higher than 20mg/kg. If the rejection criterion of one or more fluorescent points were applied then 95 samples would be rejected and 87 results would be false positives because they did not have contamination levels over 20 mg/kg which is the acceptance limit of the black light test. The results indicate that the black light test. The results indicate that the black light test, as utilised by this factory, was not able to indicate lots with possible contamination and the black light test, as recommended in the literature, would produce a high number of false positives.