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Food Control
Vol. 41, 2014; Page: 7 - 12

Risk analysis and rapid detection of the genus Thermoascus, food spoilage fungi

Kouichi Hosoya, Motokazu Nakayama, Daisuke Tomiyama, Tetsuhiro Matsuzawa, Yumi Imanishi, Seiichi Ueda, Takashi Yaguchi

Global R & D-Safety Science, Kao Corporation, 2606 Akabane, Ichikai-machi, Haga-Gun, Tochigi 321-3497, Japan.

Abstract

Recently the numbers of spoilage incidents in food industry by the species of Thermoascus are increasing, but the risk of food spoilage have never been evaluated.
It became obvious that their heat-resistances were higher than those of other heat-resist fungi,ByssochlamysHamigera and Neosartorya by our analyses. On the other hand, Thermoascus aurantiacusand Byssochlamys verrucosa had the idh gene, but they showed no patulin production in Potato dextrose broth or Czapek-glucose medium. Therefore, Thermoascus must be discriminated from other fungi in the food industry. We developed a rapid and highly-sensitive method of detecting Thermoascus in the genus level by using PCR. This method is expected to be extremely beneficial for the surveillance of raw materials in the food production process.

Keywoards: D value; Food spoilage; Heat-resistance; idh gene; PCR


 
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