照射緑茶の電子スピン共鳴法による検知 Detection method of irradiated green tea using ESR
With electron spin resonance (ESR) spectroscopy, we revealed various radicals in commercially available Japanese green tea before and after γ-irradiation. The representative ESR spectrum of green tea is composed of sextet centered at g=2.0, a singlet at the same g value and a singlet at g=4.0. The first signal is attributable to a signal with hyperfine interaction of the Mn<SUB>2+</SUB>. The second signal is due to an organic free radical. The third signal may originate from the Fe<SUB>3+</SUB>. Upon irradiation, a pair of signals was newly appeared at the symmetric positions on both sides of the organic free radical signal. According to the theory of radical production in irradiated solid, a linear relationship is expected between the radiation dose and the radical yield. We determined the unreported irradiation dose by the linear extrapolation.
- 食品照射 = Food irradiation, Japan
食品照射 = Food irradiation, Japan 41(1), 14-17, 2006-09-30