Characterization of radiation-induced luminescence properties and free radicals for the identification of different gamma-irradiated teas

Autor:	Jae-Jun Ahn, Sang-O Lee, Joong-Ho Kwon, Kashif Akram, Ik-Jae Son
Rok vydání:	2013
Předmět:	Luminescence Free Radicals Tea Chemistry Photostimulated luminescence Radiochemistry Electron Spin Resonance Spectroscopy Gamma ray PSL Biochemistry Thermoluminescence Analytical Chemistry Gamma Rays Food Irradiation Luminescent Measurements Food irradiation Irradiation Spectroscopy
Zdroj:	Analytical and Bioanalytical Chemistry. 405:4225-4234
ISSN:	1618-2650 1618-2642
DOI:	10.1007/s00216-013-6849-6
Popis:	Two kinds (20 each) of gamma-irradiated (0, 5, and 10 kGy) tea samples, blended powders and packed in sachets (tea bags), were investigated using photostimulated luminescence (PSL), thermoluminescence (TL), and electron spin resonance spectroscopy (ESR) to identify their irradiation status. PSL-based rapid screening was possible for all the control samples except for one packed and two powdered samples. The irradiated samples presented a good dose-dependent PSL count except two powdered samples with very low PSL sensitivity. TL analysis provided the most reliable results, in which all the irradiated samples were identified using a well-defined high-intensity TL glow curve in a temperature range of 150-250 °C. The TL results were also confirmed by determining the TL ratio (TL1/TL2), which was0.1 in all the non-irradiated samples and0.1 in the irradiated ones. ESR spectroscopy was effective for only 3 packed and 6 powdered samples showing the radiation-induced cellulosic and sugar radical signals, respectively.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2ee24777087538a5850401a027dda115 https://doi.org/10.1007/s00216-013-6849-6 Zobrazit plný text záznamu Plný text ve formátu PDF