Applicability of different analytical methods for the identification of gamma-irradiated fresh mushrooms during storage

作者：Akram Kashif; Ahn Jae Jun; Kim Gui Ran; Kwon Joong Ho^*

来源：Food Science and Biotechnology, 2012, 21(2): 573-579.

DOI：10.1007/s10068-012-0073-6

• gamma-irradiation
• mushroom
• identification
• photostimulated luminescence
• thermoluminescence
• electron spin resonance

Photostimulated luminescence (PSL), thermoluminescence (TL), and electron spin resonance (ESR) analyses were performed to identify gamma-irradiated (0, 1,2, and 3 kGy) fresh mushrooms (oyster, king oyster, and shiitake mushrooms) during storage at 5A degrees C. PSL analysis gave negative results [%26lt; 700 photon counts (PCs)] for the nonirradiated and intermediate (700-5,000 PCs) or positive results (%26gt; 5,000 PCs) for the irradiated samples. The shape, intensity, and occurrence of TL glow curve in a typical temperature range (150-250A degrees C) 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.

• 出版日期2012-4