辐照阿拉伯胶的电子自旋共振光谱特性。
ESR spectroscopic properties of irradiated gum Arabic.
机构信息
Departamento de Física, Faculdade de Filosofia Ciências e Letras, Universidade de São Paulo, Av. Bandeirantes 3900, 14040-901 Ribeirão Preto, SP, Brazil.
出版信息
Food Chem. 2013 Dec 1;141(3):1860-4. doi: 10.1016/j.foodchem.2013.04.095. Epub 2013 May 10.
Electron spin resonance (ESR) spectra of irradiated gum Arabic with doses between 0.5 and 5 kGy were studied. A linear relationship between the absorbed dose and the intensities of the ESR spectra was observed. ESR spectra of irradiated gum Arabic showed a decay of relative concentrations of free radicals originated by radiation and the production of at least two species of free radicals with half-times: 3.3 and 125.4 h. The results of spectral simulations for these radical groups were giso=2.0046; A=1.2 mT and gx=gy=2.0062, gz=2.0025. Hydration and dehydration of irradiated gum Arabic returns the ESR spectrum to its initial state before irradiation. The results show that ESR can be used as simple and reliable method to detect irradiated gum Arabic up to 60 days after initial radiation with doses on the order of 5 kGy.
研究了辐照阿拉伯胶的电子自旋共振（ESR）光谱，剂量范围在 0.5 至 5 kGy 之间。观察到吸收剂量与 ESR 光谱强度之间存在线性关系。辐照阿拉伯胶的 ESR 光谱显示，由辐射产生的自由基的相对浓度衰减，并且至少产生两种自由基，半衰期分别为 3.3 和 125.4 h。对这些自由基基团的光谱模拟结果为 giso=2.0046；A=1.2 mT 和 gx=gy=2.0062，gz=2.0025。辐照阿拉伯胶的水合和脱水作用使 ESR 光谱恢复到辐照前的初始状态。结果表明，ESR 可用于检测初始辐照后 60 天内剂量在 5 kGy 左右的辐照阿拉伯胶，是一种简单可靠的方法。
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