Advanced protocol for the detection of irradiated food by electron spin resonance spectroscopy |
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| Authors: | Yuhei Shimoyama Mitsuko Ukai Hideo Nakamura |
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| Affiliation: | aDepartment of Materials Science and Engineering, Muroran Institute of Technology, Muroran 050 8585, Japan;bDepartment of Chemistry Hokkaido University of Education, Hakodate 040 8567, Japan;cDepartment of Food Science Hokkaido University of Education, Hakodate 040 8567, Japan;dCREST-JST, Muroran 050 8585, Japan;eCREST-JST, Hakodate 040 8567, Japan |
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| Abstract: | Using ESR (electron spin resonance) spectroscopy, we found various free radicals in a pepper before and after irradiation. The representative ESR spectrum of the pepper composed of a sextet centered at g=2.0, a singlet at the same g-value and a singlet at g=4.0. This reflects the evidence of three independent radicals in the pepper before irradiation. Upon gamma ray irradiation, a new pair of signals appeared. The progressive saturation behavior (PSB) at various microwave power levels indicates quite different relaxation behaviors of those signals. For the evaluation of radiation-induced radicals and irradiation effects we propose a new protocol using the PSB method. This would call for an advanced protocol for the detection of irradiated foods. |
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| Keywords: | Electron spin resonance (ESR) Gamma-ray irradiation Relaxation phenomena Protocol |
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