Abstract
Gamma-irradiation is used in the production of raw edible bovine liver for the purpose of decontamination. In this study, the effect of gamma-irradiation at low temperature on the formation of trans fatty acids (TFAs) in the liver tissue was investigated. Bovine liver tissue packed with air (air-packed liver tissue) or degassed bovine liver tissue (vacuum-packed liver tissue) were gamma-irradiated with doses of 3 and 6 kGy at 0 °C, and of 5 and 10 kGy at −80 °C, respectively. Following gamma-irradiation at −80 °C, a very small increase in trans isomers of 18:2 (less than 0.1% of total fatty acids (FAs)) was detected. When bovine liver tissues were gamma-irradiated at 0 °C, dose dependent trans-isomerization of 18:1 and 18:2 was found in both types of packed samples. However, these increases in TFA were small (in the region of 0.1–0.2% of total FAs). Thiobarbituric acid value increased only in air-packed liver tissues, which were gamma-irradiated at 0 °C. These results suggest that gamma-irradiation of bovine liver at low temperature is an effective method for ensuring its safety for raw consumption, with attention to its TFA content and lipid oxidation.
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