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KMID : 0881720130280020130
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Journal of Food Hygiene and Safety
2013 Volume.28 No. 2 p.130 ~ p.137
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Detection Characteristics of Gamma-Irradiated Seeds by using PSL, TL, ESR and GC/MS
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Kim Kyu-Heon
Son Jin-Hyok
Kang Yoon-Jung
Jo Tae-Yong
Park Hye-Young
Kwak Ji-Young
Lee Jae-Hwang
Park Yong-Chjun
Kim Jae-I
Lee Hwa-Jung
Lee Sang-Jae
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), electron spin resonance (ESR) and gas chromatography/mass spectrometry (GC/MS) methods for 5 seeds which are not allowed to be irradiated in Korea. All 5 seeds including evening primrose seed, safflower seed, rape seed, sunflower seed and flax seed 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 of irradiated (1, 5, 10 kGy) samples showed positive (higher than 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. The hydrocarbons 1,7-hexadecadiene (C16:2) and 8-heptadecene (C17:1) from oleic acid were detected only in the irradiated samples before and after the treatment at doses ≥ 1 kGy, but they were not detected in non-irradiated samples before and after treatment. These two hydrocarbons could be used as markers to identify irradiated safflower seed, rape seed, Sunflower seed and flax seed. And then, the hydrocarbons 1,7,10-hexadecatriene (C16:3) and 6,9-heptadecadiene (C17:2) from linoleic acid were detected in the evening primrose seed, safflower seed and sunflower seed. According to the results, PSL, TL and GC/MS methods were successfully applied to detect the irradiated foods. It is concluded that PSL, TL and GC/MS methods are 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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Seeds, Irradiation, Detection, PSL, TL, ESR, GC/MS
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