2016 Volume 62 Pages 12-19
The relation between thickness of grain and mycotoxin （deoxynivalenol and nivalenol）concentration in Japanese barley naturally contaminated with these toxins was investigated. For this study, the toxin-contaminated barley samples were selected from samples collected by the government from some grain-drying and processing facilities such as country elevators in different areas of Japan for the national grain toxin contamination survey in 2006. The five selected samples included one hull-less six-rowed, two hulled six-rowed, and two hulled tworowed cultivars. Each grain sample was divided using sieves with different sieve sizes in 0.2 ㎜ intervals and the mycotoxin concentration of each fraction was analyzed. As a whole, there was a tendency for mycotoxin concentration levels to be lower in the thicker （larger） grain fractions, except the toxin concentration in the thinnest（ smallest） fractions was not highest in three samples among the five. Mycotoxin reduction rate for each sample sieved with each sieve size was calculated. The results were consistent with our similar study on the barley cultivars artificially infected with Fusarium graminearum species complex, which suggested sieve sorting after harvest would be effective to reduce mycotoxin contamination levels in barley, although the effect might not be large.
