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Physical and Microbiological Approach in Proving the Identity of Gamma-irradiated Different Teas

Kausar, Tusneem   (Department of Food Science and Technology, Kyungpook National UniversityUU0000096  ); Kim, Byeong-Keun   (Department of Food Irradiation, Korean Atomic Energy Research Institute  ); Kim, Dong-Ho   (Department of Food Irradiation, Korean Atomic Energy Research Institute  ); Kwon, Joong-Ho   (Department of Food Science and Technology, Kyungpook National UniversityUU0000096  );
  • 초록

    Photostimulated luminescence (PSL), thermoluminescence (TL), electron spin resonance (ESR), and direct epiflourescent filter technique/aerobic plate count (DEFT/APC) were applied to detect dried green, black, and oolong teas irradiated between 0-10 kGy. Teas irradiated at 2.5 kGy and higher showed over 5000 photon counts/60 sec, while non-irradiated teas yielded 650-1000 photon counts/60 sec. TL glow curves for minerals separated from teas were detected at about $300^{\circ}C$ with low intensity in non-irradiated samples, whereas around $150^{\circ}C$ with high intensity in all irradiated samples. Ratio of $TL_1/TL_2$ based on re-irradiation step, showing lower than 0.1 and higher than 1.44 for non-irradiated and irradiated samples, respectively, enhanced reliability of TL results. ESR measurements for irradiated teas showed signals specific to irradiation. Log DEFT/APC ratio increased with irradiation dose; this result could be applied to identify irradiated tea samples.


  • 주제어

    irradiated teas .   identity .   PSL .   TL .   DEFT/APC.  

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