Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Characteristics of Thermoluminescence and Electron Spin Resonance and Organoleptic Quality of Irradiated Raisin and Dried Banana During Storage

건포도와 건바나나의 감마선 조사와 저장기간에 따른 열발광 및 전자스핀공명 특성과 관능적 품질

  • Jo, Deok-Jo (Dept. of Food Science and Technology, Kyungpook National University) ;
  • Kwon, Joong-Ho (Dept. of Food Science and Technology, Kyungpook National University)
  • Published : 2002.08.01
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Abstract

The characteristics of thermoluminescence (TL) and electron spin resonance (ESR) and organoleptic qualities of gamma-irradiated raisin and dried banana were investigated during storage at 4$^{\circ}C$ for 6 months. The minerals separated from non-irradiated raisins showed TL glow curve (TL$_1$) with very low intensity around 200~30$0^{\circ}C$, while the irradiated samples at 1 kGy or more showed glow curves with higher intensity around 18$0^{\circ}C$, with linear increase by irradiation dose ($R^2$=0.9684), which made it possible to identify irradiated samples during 6 months. Moreover, TL ratios (TL$_1$/TL$_2$) through the reirradiation step at 1 kGy enhanced confidence in the identification of irradiated raisins. The ESR signals of multicomponent lines resulted from crystalline sugar radicals were shown in irradiated banana, identifying irradiated samples. The ESR signal intensity was dependent on irradiation doses ($R^2$=0.8977) and the signals were stable enough to be detected by 6th month after storage. Considering tile marketability of irradiated dried fruits during 6 months at low temperature TL and ESR analyses were shown suitable for the identification of irradiated raisins and dried banana, respectively.

방사선 조사(1~4 kGy)와 저장 기간(4$^{\circ}C$, 6개월)에 따른 건조과일의 TL 및 ESR검지 특성과 관능적 품질을 평가하였다. 건포도에서 분리된 mineral의 TL측정에서 비조사구는 200~30$0^{\circ}C$ 부근에서 매우 낮은 intensity의 glow curve(TLI)를 나타내었으나, 1 kGy 이상의 조사구에서는 특유의 peak가 18$0^{\circ}C$ 부근에서 나타나면서 선량 의존적으로 intensity가 증가되었다($R^2$=0.9684). 이로써 방사선 조사구와 비조사구의 판별이 6개월 동안 가능하였다. 또한 재조사(1 kG)에 의해 측정된 TL$_2$signal을 활용하여 TL ratio(TL$_1$/TL$_2$)를 계산하였을 때 검지결과의 신뢰도를 높일 수 있었다. 건 바나나의 ESR 측정에서 1 kGy 이상의 조사 시료는 crystalline sugar radical 유래의 전형적인 multicomponent line을 보여 주어 조사 여부의 판별이 가능하였고 signal의 강도는 선량 의존적($R^2$= 0.8977)으로 6개월 동안 비교적 안정하였다. 방사선 조사된 건조과일은 6개월까지 상품성이 잘 유지되었으므로 TL 및 ESR 분석은 건포도와 건 바나나의 검지 관리에 적합한 방법임이 확인되었다.

Keywords

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