Identification of irradiated tea by ESR spectroscopy

Chen FEI; Xinjin YE; Haiwei ZHANG; Jin LIANG; Wenjia ZHENG

doi:10.11889/j.1000-3436.2016.rrj.34.030401

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Identification of irradiated tea by ESR spectroscopy

RADIATION TECHNOLOGY APPLICATION | 更新时间：2021-12-10

- Identification of irradiated tea by ESR spectroscopy
- Journal of Radiation Research and Radiation Proces Vol. 34, Issue 3, Pages: 58-64(2016)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
  
  Supported by Scientific Research Project of Anhui Province Department of Education (the Provincial Level of Key Projects Fund with the Outstanding Young Talents in Universities and Colleges(2013SQRL017ZD);Project of Guizhou Province Tea Processing Technology Innovation Talents Team (Guizhou Branch Talent Team(黔科合人才团队[2014]4025号)
- DOI：10.11889/j.1000-3436.2016.rrj.34.030401
  CLC：
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Chen FEI, Xinjin YE, Haiwei ZHANG, et al. Identification of irradiated tea by ESR spectroscopy. [J]. Journal of Radiation Research and Radiation Proces 34(3):58-64(2016)
DOI：

Chen FEI, Xinjin YE, Haiwei ZHANG, et al. Identification of irradiated tea by ESR spectroscopy. [J]. Journal of Radiation Research and Radiation Proces 34(3):58-64(2016) DOI： 10.11889/j.1000-3436.2016.rrj.34.030401.

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(,p,<,0.01);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(,p,<,0.01),据此表明,使用ESR法可以鉴别辐照与非辐照的茶叶。

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.

关键词

电子自旋共振辐照自由基茶叶检测

Keywords

Electron spin resonance (ESR)IrradiationFree radicalsTeaDetection

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