Radiosensitivity of Aspergillus versicolor Isolated from Animal Feeds and Destruction of Sterigmatocystin by Gamma-irradiation

概要

論文の詳細を見る
The survival curves ofconidia of A. versicolor isolated from animal feeds were sigmoidal both in the wet and dry states. The D10 values and induction doses of three isolates were 37 and 17-18 krad in the wet condition, and 50-51 and 25-48 krad in the.dry state, respectively. From these results, it was indicated that A. versicolor could be sterilized below 0.7 Mrad. The radiosensitivity of other osmophilic Aspergillus isolated from animal feeds was similar to those of A. versicolor. Two of the three isolates of A. versicolor produced the known carcinogen sterigmatocystin. The amount of sterigmatocystin produced on rice was 410 and 280fig for the strains Ml3 and C132, respectively, while it was 730 μg for the typical strain MYA-0056.Pure sterigmatocystin was stable to irradiation in the dry state. There was a linear relationship between the destruction of sterigmatocystin and the irradiation dose, and 52 Mrad irradiation was necessary for complete destruction. Consequently, A. versicolor in animal feeds must be sterilized prior to its producing sterigmatocystin.
社団法人日本農芸化学会の論文