Analysis of electron spin resonance spectra for the identification of complex ESR signals using irradiated standard marker materials
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European standards EN1787 and EN13708 specify spectroscopic methods for the detection of irradiated food. Electron spin resonance (ESR) spectral characteristics of radiation-induced radicals in standard marker materials (cellulose, glucose, fructose, and saccharose) were compared. Standard marker materials were gamma-irradiated (0 and 10 kGy) and mixed at different blending ratios (0–100 %) to evaluate their sensitivity upon ESR detection. Blended samples produced specific ESR signals which showed increased intensities by an increasing percentage of the irradiated component. However, detection was possible with 30 % irradiated component. The results could be helpful in interpreting complex ESR signals in plant materials containing cellulose and sugar materials.
KeywordsESR spectroscopy Irradiated standard marker Detection limit Cellulose radical Crystalline sugar radical
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Education (MOE) (No. NRF-2013R1A1A4A03006993).
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