Journal
FOOD CONTROL
Volume 71, Issue -, Pages 57-63Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodcont.2016.06.006
Keywords
Aflatoxin; Fumonisin; Deoxynivalenol; Cyclopiazonic acid; Zearalenone; Common smut gall; Commercial products
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Corn infected with Ustilago maydis, causal agent of common smut disease, produces galls that are used as food in certain cultures, but may be contaminated with mycotoxins. The objective of this study was to determine mycotoxin levels in common smut galls (CSGs) collected from the field at corn ear reproductive stages R1 through R5 and in commercial CSGs products. The study was conducted in 2012 and 2013. A simple extraction method for five mycotoxins was devised and the results showed the presence of these compounds in CSGs in corn during ear development at various physiological stages. Fumonisin was the major mycotoxin in CSG samples in both 2012 (63%, <= 150.7 mu g g(-1)) and 2013 (46.9%, <= 20.9 mu g g(-1)); followed by aflatoxin (2012: 2%, <= 14.7 ng g(-1); 2013: 30.6%, <= 10.8 ng g(-1)) and zearalenone (2012: <= 41.70 ng g(-1); 2013: <= 12.40 ng g(-1)). Deoxynivalenol (DON) was only detected in 2012 (<= 1.6 mu g g(-1)), and cyclopiazonic acid was only detected in 2013 (<= 3.18 mu g g(-1)). Commercial canned and fresh CSG samples also contained detectable amounts of mycotoxins including aflatoxin, fumonisin, CPA, and DON. Aspergillus flavus was isolated from selected 2013 CSG field samples at R2 or older (0 -1.6 x 10(6) cfu/g), whereas Fusarium spp were isolated at R1 or older (0-7.5 x 10(7) cfu/g). These results indicate that CSGs can be infected with mycotoxigenic fungi and contaminated with mycotoxins. The incidence of mycotoxins in commercially available CSG products was highly variable and warrants further study. Published by Elsevier Ltd.
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