| 电子自旋共振技术鉴别辐照茶叶 |
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| 引用本文： | 费晨,叶馨今,张海伟,梁进,郑文佳. 电子自旋共振技术鉴别辐照茶叶[J]. 辐射研究与辐射工艺学报, 2016, 0(3). DOI: 10.11889/j.1000-3436.2016.rrj.34.030401 |
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| 作者姓名： | 费晨 叶馨今 张海伟 梁进 郑文佳 |
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| 作者单位： | 1. 安徽农业大学茶与食品科技学院合肥 230036;2. 贵州省茶叶科学研究所贵阳 550000 |
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| 基金项目： | 安徽省教育厅科研项目[高校省级优秀青年人才基金重点项目(2013SQRL017ZD)，贵州省茶叶加工科技创新人才团队项目(黔科合人才团队[2014]4025号)资助 Supported byScientific Research Project of Anhui Province Department of Education(the Provincial Level of Key Projects Fund with the Outstanding Young Talents in Universities and Colleges |
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| 摘 要： | 研究黄山毛峰和祁门红茶经Co-60γ射线辐照诱导的电子自旋共振(Electron spin resonance,ESR)波谱特征,以及吸收剂量、贮藏时间与茶叶中自由基ESR信号强度的关系,考察利用ESR技术鉴别辐照茶叶的可行性。结果显示,低吸收剂量能显著增加茶叶中ESR信号强度(p0.01);茶叶中自由基的信号强度随吸收剂量呈多项式关系增长,与贮藏时间呈乘幂函数关系下降;在常温贮藏70 d后,信号强度逐渐稳定,但依然显著高于未辐照样品的信号强度(p0.01),据此表明,使用ESR法可以鉴别辐照与非辐照的茶叶。
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| 关 键 词： | 电子自旋共振 辐照 自由基 茶叶 检测 |
Identification of irradiated tea by ESR spectroscopy |
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| Abstract: | In order to explore the possibility to identify the irradiated tea by electron spin resonance (ESR), green tea (Huangshan Maofeng Tea) and black tea (Keemun Black Tea) were detected by ESR after irradiation with Co-60 γ-rays. The relations between ESR intensity of the tea samples and absorbed doses as well as storage time were analyzed. It turned out that there was a significant increase of free radicals intensity in all tea samples at low absorbed doses (p<0.01). The relations between the tea ESR intensity and absorbed doses fitted the multinomial growth while the relations between the tea ESR intensity and storage time fitted the power correlation decrease. After storage at room temperature for 70 d, the ESR intensity in irradiated tea decreased to the steady state which was still significantly higher than that in unirradiated tea samples (p<0.01). Therefore, it is possible to use ESR to identify whether the green or black tea was irradiated or not. |
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| Keywords: | Electron spin resonance (ESR) Irradiation Free radicals Tea Detection |
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