Journal of Ginseng Research

The Korean Society of Ginseng (고려인삼학회)
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Luminescence properties and compositions of contaminating inorganic minerals separated from gamma-irradiated fresh and white ginsengs from different areas

  • Ahn, Jae-Jun (School of Food Science & Biotechnology, Kyungpook National University) ;
  • Akram, Kashif (School of Food Science & Biotechnology, Kyungpook National University) ;
  • Jeong, Mi-Seon (School of Food Science & Biotechnology, Kyungpook National University) ;
  • Kwak, Ji-Young (School of Food Science & Biotechnology, Kyungpook National University) ;
  • Park, Eun-Joo (School of Food Science & Biotechnology, Kyungpook National University) ;
  • Kwon, Joong-Ho (School of Food Science & Biotechnology, Kyungpook National University)
  • Received : 2012.10.04
  • Accepted : 2013.07.23
  • Published : 2013.10.15
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Abstract

Gamma-irradiation (0-7 kGy) of ginseng is permitted in Korea for the purpose of microbial decontamination; with strict labeling, traceability and monitoring requirements. An identification study was conducted to determine the photostimulated-luminescence (PSL) and thermoluminescence (TL) properties of gamma-irradiated fresh and white ginsengs cultivated in different areas. Dose- dependent PSL-based screening was possible for white ginseng samples; however, inappropriate results from non-irradiated fresh ginseng samples were obtained, showing intermediate (700 to 5,000) or positive ($T_2$ >5,000, irradiated) PSL counts due to the abundance of minerals on the surfaces of the samples. TL analysis of separated minerals from all non-irradiated samples gave TL glow curves of low intensity with a maximum peak after $300^{\circ}C$. However, well-defined irradiation-specific (high intensity with a maximum peak at about $200^{\circ}C$) glow curves were observed for all the irradiated samples, regardless of their type and origins. TL ratios (first glow curve /second glow curve) were also determined to confirm the irradiated (>0.1) and non-irradiated (<0.1) results. SEM-EDX (scanning electron microscope-energy dispersive X-ray) and XRD (X-ray diffraction) spectroscopic analyses showed that feldspar and quartz minerals were the main source for the typical radiation-specific luminescence properties.

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References

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