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Sterigmatocystin and aflatoxin B 1 contamination of corn, soybean meal, and formula feed in Japan.
Mycotoxin Research 2018 March
Sterigmatocystin (STC) and aflatoxin B1 (AFB1 ) were analyzed in 246 corn samples, 126 soybean meal samples, and 861 formula feed samples from the Japanese market between April 2010 and March 2015. The detection rate, the highest concentration, and the mean concentration of STC were respectively 14%, 6.4 μg/kg, and 1.2 μg/kg for corn; 14%, 1.1 μg/kg, and 0.63 μg/kg for soybean meal; and 43%, 9.1 μg/kg, and 0.97 μg/kg for formula feed. The detection rate, the highest concentration, and the mean concentration of AFB1 were respectively 46%, 24 μg/kg, and 3.9 μg/kg for corn; 30%, 6.7 μg/kg, and 1.1 μg/kg for soybean meal; and 47%, 20 μg/kg, and 1.6 μg/kg for formula feed. A weak negative correlation between the STC and AFB1 concentrations was observed: there was a high concentration of AFB1 in samples that contained a lower concentration of STC and vice versa. Spearman's rank correlation coefficient showed a weak negative correlation of - 0.30 (p < 0.001, n = 128) for corn and - 0.23 (p < 0.001, n = 575) for formula feed. In conclusion, no correlation was observed between the mean concentrations of STC contamination in formula feed (0.97 μg/kg) and in corn (1.2 μg/kg) and the blending rate (approximately 50%). The rate of STC contamination in the formula feed (43%) was higher than that in corn (14%). Therefore, it is likely that ingredients other than corn contribute to the contamination of formula feed with STC. In this study, regarding STC, problematic samples were not found.
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