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J.Health Sci., 53(2), 215-219, 2007
Effects of Temperature during Irradiation on the Production of 2-Alkylcyclobutanones in Beef
Hirotaka Obana,*, a Masakazu Furuta,b
and Yukio Tanakaa
aOsaka Prefectural Institute of Public Health, 1-3-69 Nakamichi, Higashinari, Osaka 537-0025, Japan and
bOsaka Prefecture University Graduate School of Science, 1-2 Gakuen-cho, Naka, Sakai, Osaka 599-8570, Japan
Beef patties were irradiated with γ-rays at three temperatures, room temperature, chilled, and frozen. 2-Alkylcyclobutanones in irradiated beef patties were then analyzed to confirm the effects of the three temperatures during irradiation on their production. The production of 2-dodecylcyclobutanone (2-DCB) and 2-tetradecylcyclobutanone (2-TCB) were decreased in the samples cooled with ice and dry ice compared with those at room temperature. 2-DCB was dominant in the samples irradiated at room temperature, which reflected the composition of the precursor of the fatty acid in the samples, whereas they became lower than 2-TCB in the samples irradiated with cooling. The data indicate that the temperature during irradiation greatly affects the radiolytic production of 2-alkylcyclobutanones, particularly 2-DCB, as well as precursor concentrations.
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