TITLE

Identification of γ-ray irradiated medicinal herbs using pulsed photostimulated luminescence, thermoluminescence, and electron spin resonance spectroscopy

AUTHOR(S)
Pal, Sukdeb; Byeong Keun Kim; Won Young Kim; Min Jung Kim; Hyeon A. Ki; Kyeong-Hee Lee; Woo Suk Kang; In Ho Kang; Shin Jung Kang; Joon Myong Song
PUB. DATE
August 2009
SOURCE
Analytical & Bioanalytical Chemistry;Aug2009, Vol. 394 Issue 7, p1931
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Dried herbal samples consisting of root, rhizome, cortex, fruit, peel, flower, spike, ramulus, folium, and whole plant of 20 different medicinal herbs were investigated using pulsed photostimulated luminescence (PPSL), thermoluminescence (TL), and electron spin resonance spectroscopy (ESR) to identify γ-ray irradiation treatment. Samples were irradiated at 0–50 kGy using a 60Co irradiator. PPSL measurement was applied as a rapid screening method. Control samples of 19 different herbs had photon counts less than the lower threshold value (700 counts 60 s−1). The photon counts of non-irradiated clematidis radix and irradiated evodia and gardenia fruits were between the lower and upper threshold values (700–5,000 counts 60 s−1). TL ratios, i.e., integrated areas of the first glow (TL1)/the second glow (TL2), were found to be less than 0.1 in all non-irradiated samples and higher than 0.1 in irradiated ones providing definite proof of radiation treatment. ESR spectroscopy was applied as an alternative rapid method. In most of the irradiated samples, mainly radiation-induced cellulosic, sugar, and relatively complicated carbohydrate radical ESR signals were detected. No radiation-specific ESR signal, except one intense singlet, was observed for irradiated scrophularia and scutellaria root and artemisiae argyi folium. [Figure not available: see fulltext.]
ACCESSION #
43169033

 

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