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KMID : 0881720120270030233
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Journal of Food Hygiene and Safety
2012 Volume.27 No. 3 p.233 ~ p.246
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Studies on the Applications of PSL, TL and ESR Methods for The Detection of Irradiated Foods not Allowed to be Irradiated in Korea
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Kim Kyu-Heon
Choi Eun-Jin
Kang Myung-Hee
Park Sue-Nie
Jang Ho-Won
Shin Choon-Shik
Kim Moon-Young
Hwang Cho-Rong
Kim Eun-Jeong
Cho Tae-Yong
Park Geon-Sang
Kim Jae-I
Kim Jin-Sook
Seong Rack-Seon
Jang Young-Mi
Yoon Hae-Seong
Han Sang-Bae
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Abstract
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In this study, we investigated the applicability of the photostimulated luminescence(PSL), thermoluminescence(TL) and electron spin resonance(ESR) methods for various foods which are not allowed to be irradiated in Korea. All 15 foods including sesame, almond, peanut, cocoa powder etc. were analyzed. Samples were irradiated at 1~10 kGy using a 60Co gamma-ray irradiator. In PSL study, the photon counts of all the unirradiated samples showed negative(lower than 700). The photon counts irradiated(1 kGy) dried shrimp, roasted peanut and seasoned peanut showed positive(higher than 5,000) and the other samples were negative or intermediate(> 700 and < 5,000). In TL analysis, results showed that it is possible to apply TL method to all foods containing minerals. In ESR measurements, the ESR signal(single-line) intensity of irradiated foods was higher than non-irradiated foods. In particular, the specific ESR signals of irradiation-induced crystalline sugar, cellulose and bone radical were detected in dried plum, raisin, dried cherry, mango(dried, frozen), rambutan, cocoa(powder), cinnamon, parsley, carrot, broccoli, dried arrow squid, dried pollack and dried shrimp. According to the results, PSL, TL and ESR methods were successfully applied to detect the irradiated foods because TL method is not able to detect the irradiated foods rarely composed of minerals. ESR is also a difficult method to detect the changes of ESR signal patterns of food. It is concluded that TL analysis or ESR assay is suitable for detection of irradiated samples and a combined method is recommendable for enhancing the reliability of detection results.
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KEYWORD
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Irradiation Food, Detection method, PSL, TL, ESR
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