کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1235756 968853 2006 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An electron spin resonance study of γ-ray irradiated ginseng
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
An electron spin resonance study of γ-ray irradiated ginseng
چکیده انگلیسی

Using electron spin resonance (ESR) spectroscopy, we revealed the presence of four radical species in γ-ray irradiated ginseng (Agaliaceae). Before irradiation, the representative ESR spectrum of ginseng is composed of a sextet centered at g = 2.0, a sharp singlet at the same g-value, and a singlet at about g = 4.0. The first one is attributable to a hyperfine (hf) signal of Mn2+ ion (hf constant: 7.4 mT). The second one is due to an organic free radical. The third one is originated from Fe3+. Upon γ-ray irradiation, a new ESR (the fourth) signal was detectable in the vicinity of g = 2.0 region. The progressive saturation behaviors of the ESR signals at various microwave power levels were indicative of different relaxation time for those radicals. The anisotropic ESR spectra were detected by the angular rotation of the sample tube. This is due to the existence of anisotropic microcrystalline in the ginseng powder sample.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 63, Issue 4, 13 March 2006, Pages 883–887
نویسندگان
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