ＥＳＲによる照射殺菌朝鮮人参の検知

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  • Detection of Irradiated Ginseng Using ESR Spectrometry

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Using electron spin resonance (ESR) spectrometry, we revealed the presence of radical species in γ ray irradiated ginseng and developed a quantitative detection method of dose levels. The ESR spectrum of ginseng consisted of a sharp and strong singlet signal at g=1.992 due to an organic free radical, hyperfine signals of Mn2+ ion and a singlet from Fe3+ ion. Upon γ ray irradiation, the signal intensity of organic free radical was increased. Also, a new ESR signal was detected in the vicinity of g=2.0 region. After irradiation, new four radical species were identified in the irradiated ginseng. A linear relationship was found between the ESR intensity and the irradiation dosage of ginseng. Using the nonlinear least squares method, the unknown dosage of the ginseng sample was estimated as 4 kGy by the extrapolated value.

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