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Influence of Gamma-Irradiation on the Growth of Aspergillus spp. on Feeds for Ensuring Feed Safety  

Nam, Bo-Ram (Division of Applied Life Science(BK21 program), Graduate School, Institute of Agriculture and Life Science, Gyeongsang National University)
Kim, Kyeong-Yeol (Division of Applied Life Science(BK21 program), Graduate School, Institute of Agriculture and Life Science, Gyeongsang National University)
Ryu, Hee-Jeong (Division of Applied Life Science(BK21 program), Graduate School, Institute of Agriculture and Life Science, Gyeongsang National University)
Nam, Min-Ji (Division of Applied Life Science(BK21 program), Graduate School, Institute of Agriculture and Life Science, Gyeongsang National University)
Shim, Won-Bo (Institute of Agriculture and Life Science, Gyeongsang National University)
Yoon, Yo-Han (Team for Radiation Food Science and Biotechnology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
Kim, Jae-Hun (Team for Radiation Food Science and Biotechnology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
Lee, Ju-Woon (Team for Radiation Food Science and Biotechnology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
Byun, Myung-Woo (Team for Radiation Food Science and Biotechnology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
Chung, Duck-Hwa (Division of Applied Life Science(BK21 program), Graduate School, Institute of Agriculture and Life Science, Gyeongsang National University)
Publication Information
Korean Journal of Food Science and Technology / v.42, no.3, 2010 , pp. 317-322 More about this Journal
Abstract
Aspergillus spp. is widely spread in the world on feeds and foods. They have been known to produce aflatoxins, which are mutagenic and carcinogenic to humans. The objective of this study was to determine the optimum gamma-irradiation dose for controling the growth of Aspergillus spp. to ensure safety of feeds. Four species fungal spore ($10^7$ spore/mL) exposed to 0, 1, 3, 5, 7 and 10 kGy of gamma radiation were inhibited in their growth and $AFB_1$ productivity by ${\geq}5\;kGy$. Meantime, the growth of fungal inoculated on feeds was inhibited at ${\geq}3\;kGy$. However, $AFB_1$ presented in aqueous solution was not be inactivated completely by ${\leq}10\;kGy$ irradiation. These results indicate that Aspergillus spp. on feeds could be controlled by 5 kGy gamma-irradiation but detoxification of $AFB_1$ demands a higher dose of gamma-irradiation (${\geq}10\;kGy$).
Keywords
gamma-irradiation; Aspergillus spp.; aflatoxin $B_1$; feed;
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