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http://dx.doi.org/10.3746/jkfn.2008.37.11.1529

Detection Characteristics of Gamma-Irradiated Korean Medicinal Herbs by Using PSL, TL, and ESR  

Yang, Hee-Sun (Radiation Research Center for Innovative Technology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
Park, Yong-Dae (Radiation Research Center for Innovative Technology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
Jin, Chang-Hyun (Radiation Research Center for Innovative Technology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
Choi, Dae-Seong (Radiation Research Center for Innovative Technology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
Chung, Hyung-Wook (New Hazard Chemicals Team, Korea Food & Drug Administration)
Byun, Myung-Woo (Radiation Research Center for Innovative Technology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
Jeong, Il-Yun (Radiation Research Center for Innovative Technology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.37, no.11, 2008 , pp. 1529-1533 More about this Journal
Abstract
The detection characteristics of gamma-irradiated ($0{\sim}10.0\;kGy$) medicinal herbs (Platycodon grandiflorum, Acanthopanax chiisanensis) were investigated by photostimulated luminescence (PSL), thermoluminescence (TL), and electron spin resonance (ESR). The results of the PSL, a first screening method in comparison with the TL, showed photon counts greater than 5,000 counts/60 s (positive) in the irradiated samples, while the non-irradiated samples yielded photon counts less than 700 counts/60 s (negative). The TL was also applied for the detection method of irradiated medicinal herbs and showed that the non-irradiated sample revealed a glow curve with a low intensity, while the irradiated samples showed a higher intensity. These results were normalized by re-irradiating the mineral grains with a irradiation dose of 1.0 kGy, and a second glow curve was recorded. The ratio of the intensity of the first glow curve ($TL_1$) to that after the normalization dose ($TL_2$) was determined and compared with the recommended threshold values. TL ratio ($TL_1/TL_2$) was below 0.007 for the non-irradiated sample and higher than 0.1 for all irradiated samples (above 1.0 kGy). ESR spectroscopy revealed specific signals (6.065 mT) derived from free radicals in cellulose containing irradiated medicinal herbs. The P. grandiflorum showed clearer signals than A. chiisanensis. From the results of our studies, the PSL, TL, and ESR determinations were found to be suitable for the detection of irradiated medicinal herbs such as P. grandiflorum and A. chiisanensis.
Keywords
PSL; TL; ESR; irradiation; medicinal herb;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
Times Cited By SCOPUS : 0
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