Department of Food Science and Technology, Kyungpook National University, Daegu 702-701, Republic of Korea.
J Sci Food Agric. 2013 Feb;93(3):634-40. doi: 10.1002/jsfa.5875. Epub 2012 Sep 11.
The general use of food irradiation requires reliable identification methods as well as extensive quality characterization. Shiitake (Lentinus edodes) mushrooms, packed in polystyrene trays and covered with polyvinylchloride film, were investigated for dose-dependent identification and quality characterization upon gamma irradiation (0, 1, 2, and 3 kGy).
Thermoluminescence (TL) analysis of separated minerals provided excellent results to characterize the irradiated mushrooms. Low-dose re-irradiation (200-600 Gy), medium-dose re-irradiation (1-3 kGy) and high-dose re-irradiation (2-6 kGy) were performed and compared using an additive dose method. An electronic-nose analysis showed a difference in the volatile profiles of mushrooms following irradiation. One-kGy-irradiated mushrooms showed similar or better quality attributes to those of the control samples. Scanning electron microscopy revealed the dose-dependent degradation in microstructure of mushrooms upon irradiation.
An absorbed dosed estimation was possible using TL analysis in which 1-3 kGy re-irradiation technique gave most promising results. An E-nose analysis effectively distinguished the samples based on irradiation history. The best quality attributes were observed at 1 kGy irradiation. However, the drastic effects of irradiation were prominent in 2 and 3 kGy-irradiated mushrooms.
食品辐照的广泛应用需要可靠的识别方法和广泛的质量特征描述。本文研究了在γ射线辐照（0、1、2 和 3 kGy）下，用聚苯乙烯托盘包装并覆盖聚氯乙烯薄膜的香菇剂量依赖性识别和质量特征。
分离矿物的热释光（TL）分析为辐照香菇的特征提供了极好的结果。采用附加剂量法对低剂量再辐照（200-600 Gy）、中剂量再辐照（1-3 kGy）和高剂量再辐照（2-6 kGy）进行了比较。电子鼻分析显示，辐照后香菇的挥发性图谱存在差异。1 kGy 辐照的香菇与对照样品具有相似或更好的品质特征。扫描电子显微镜显示，辐照会导致香菇微观结构的剂量依赖性降解。
TL 分析可用于估计吸收剂量，其中 1-3 kGy 的再辐照技术给出了最有前途的结果。电子鼻分析可根据辐照历史有效地对样品进行区分。在 1 kGy 辐照下观察到最佳的品质特征。然而，在 2 和 3 kGy 辐照的香菇中，辐照的剧烈影响更为明显。
