Helle N, Wolbert A, Linke B, Ehlers D, Krüger K E
Staatliches Veterinäruntersuchungsamt für Fische und Fischwaren Cuxhaven, Germany.
Z Lebensm Unters Forsch. 1995 Oct;201(4):355-60. doi: 10.1007/BF01192732.
This paper describes the development of a method for the identification of irradiated fresh fruits by measurement of the e.p.r. spectra of pips, kernels or stones. Measurement parameters were optimized and the irradiation specific spectrum was assigned to a cellulose radical by comparison with the e.p.r. spectrum of pure cellulose. Several fruits especially different varieties of strawberries were examined giving the following results: Detectable minimum doses were between 0.4 kGy and 0.9 kGy and the intensity of the irradiation specific signals was found to be linear up to doses of 11 kGy. The lifetime of the specific radicals (at room temperature and at deep freezing temperatures) was long enough compared to the storage time of fresh fruits. Additional information about the nature of the unspecific central signal was gained measuring the samples which were stored at different temperatures. The main conclusion of this study is that the e.p.r. method seemes to be well suited for the use in routine control and should be tested in an intercomparison to establish a routine method for the identification of irradiated fresh fruits.
本文描述了一种通过测量果核、果仁或果籽的电子顺磁共振（e.p.r.）光谱来鉴定辐照新鲜水果的方法的开发。优化了测量参数，并通过与纯纤维素的e.p.r.光谱比较，将辐照特异性光谱归因于纤维素自由基。对几种水果，特别是不同品种的草莓进行了检测，结果如下：可检测的最小剂量在0.4千戈瑞和0.9千戈瑞之间，发现辐照特异性信号的强度在11千戈瑞剂量范围内呈线性。与新鲜水果的储存时间相比，特定自由基在室温及深度冷冻温度下的寿命足够长。通过测量在不同温度下储存的样品，获得了关于非特异性中心信号性质的更多信息。本研究的主要结论是，e.p.r.方法似乎非常适合用于常规检测，并且应该在相互比较中进行测试，以建立一种鉴定辐照新鲜水果的常规方法。
