电子传感、校准后的光激发光（PSL）以及改进后的电子自旋共振（ESR）技术可鉴别辐照过的新鲜葡萄柚和柠檬。
E-sensing, calibrated PSL, and improved ESR techniques discriminate irradiated fresh grapefruits and lemons.
作者信息
Jo Yunhee, Ameer Kashif, Chung Namhyeok, Kang Yoon-Han, Ahn Dong U, Kwon Joong-Ho
机构信息
1School of Food Science and Biotechnology, Kyungpook National University, Daegu, 41566 South Korea.
Health Research Department, Health and Environment Institute of Daegu, Daegu, 42183 South Korea.
出版信息
J Food Sci Technol. 2020 Jan;57(1):364-374. doi: 10.1007/s13197-019-04068-y. Epub 2019 Sep 5.
Grapefruit and lemon were exposed to phytosanitary irradiation doses of 0, 0.4, and 1 kGy, and then electronic-sensing screening of irradiation status and identification of radiation-induced ESR markers were conducted during 20 days storage. Codex standard photostimulated luminescence measurement (PSL) was not a reliable indicator of irradiation status. Electronic tongue and electronic nose, however, showed potential as screening tools for discriminating irradiated fruits from non-irradiated counterparts based on principal component analysis of taste attributes and flavor patterns. Calibrated PSL approach clearly distinguished irradiated from non-irradiated samples based on the PSL ratio (PSL/PSL). Verification of irradiation status by electron spin resonance spectroscopy revealed clear paramagnetic centers from both irradiated fruits samples and ethanol-vacuum drying pretreatment improved radiation-induced ESR signal detection; not prominent enough in 0.4 kGy-irradiated commodities during 20 days of storage. Peel parts of both fruits showed high limonene which proportionally increased with irradiation doses (< 0.05 kGy).
将葡萄柚和柠檬暴露于0、0.4和1千戈瑞的植物检疫辐照剂量下，然后在20天的储存期内进行辐照状态的电子传感筛选以及辐射诱导的电子自旋共振（ESR）标记物的鉴定。食品法典标准光激发发光测量（PSL）并非辐照状态的可靠指标。然而，基于味觉属性和风味模式的主成分分析，电子舌和电子鼻显示出作为区分辐照水果和未辐照水果的筛选工具的潜力。校准后的PSL方法基于PSL比率（PSL/PSL）清晰地区分了辐照样品和未辐照样品。通过电子自旋共振光谱对辐照状态的验证表明，辐照水果样品均出现明显的顺磁中心，乙醇-真空干燥预处理提高了辐射诱导的ESR信号检测；在0.4千戈瑞辐照的商品储存20天期间，信号增强不够显著。两种水果的果皮部分均显示出高含量的柠檬烯，其含量随辐照剂量（<0.05千戈瑞）成比例增加。
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