Advanced protocol for the detection of irradiated food by electron spin resonance spectroscopy

摘要

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.