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KMID : 1007520120210020573
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Food Science and Biotechnology
2012 Volume.21 No. 2 p.573 ~ p.579
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Applicability of Different Analytical Methods for the Identification of γ-Irradiated Fresh Mushrooms During Storage
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Kashif Akram
Ahn Jae-Jun
Kim Gui-Ran
Kwon Joong-Ho
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Abstract
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Photostimulated luminescence (PSL), thermoluminescence (TL), and electron spin resonance (ESR) analyses were performed to identify γ-irradiated (0, 1,2, and 3 kGy) fresh mushrooms (oyster, king oyster, and shiitake mushrooms) during storage at 5oC. PSL analysis gave negative results [<700 photon counts (PCs)] for the nonirradiated and intermediate (700-5,000 PCs) or positive results (>5,000 PCs) for the irradiated samples. The shape, intensity, and occurrence of TL glow curve in a typical temperature range (150-250oC) along with TL ratio (TL1/ TL2) provided sufficient information to confirm the irradiation history of samples. Storage resulted in a negligible fading effect on PSL and TL characteristics. X-ray diffraction analysis showed the abundance of feldspar and quartz minerals in the separated dust from mushrooms. In detailed ESR analysis employing different sample pre-treatments, all samples were silent for radiation-specific ESR signals giving only a central signal (g=2.005) that showed an increase in intensity upon irradiation.
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KEYWORD
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γ-irradiation, mushroom, identification, photostimulated luminescence, thermoluminescence, electron spin resonance
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