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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Quality Characteristics of Low-Dose Electron Beam Irradiated-Imported Navel Orange during Storage at Low Temperature (3°C)

저선량 전자선 조사 수입 오렌지의 저온 저장 중 품질 특성

  • Cho, Yun-Jeong (Department of Food and Nutrition, Chungnam National University) ;
  • Kim, Kyung-Hee (Department of Food and Nutrition, Chungnam National University) ;
  • Yook, Hong-Sun (Department of Food and Nutrition, Chungnam National University)
  • 조윤정 (충남대학교 식품영양학과) ;
  • 김경희 (충남대학교 식품영양학과) ;
  • 육홍선 (충남대학교 식품영양학과)
  • Received : 2014.09.05
  • Accepted : 2014.10.21
  • Published : 2015.01.31
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Abstract

This study investigated the effects of low-dose electron beam irradiation treatment on physicochemical and sensorial properties of imported navel oranges during storage at $3^{\circ}C$ for 45 days. The samples were irradiated at doses of 0.2, 0.4, 0.6, 0.8, and 1.0 kGy, and changes in their color values, hardness, Brix/acid ratio, total sugar contents, reducing sugar contents, vitamin C contents, and sensory evaluation were investigated. There were no significant differences between non-irradiated and irradiated samples in terms of color values, Brix/acid ratio, total sugar contents, total reducing sugar contents, and vitamin C contents. Hardness of irradiated sample at 1 kGy decreased significantly in the early storage period, but the difference between non-irradiated and irradiated samples decreased again at the end of storage. For the sensory evaluation, scores of color, sweetness, flavor, and overall acceptability decreased as irradiation dose and storage period increased. Samples irradiated at over 0.8 kGy showed low preference in all scores except color. These results suggest that electron beam irradiation below 0.6 kGy does not affect physicochemical and sensory properties; thus, electron beam irradiation up to 0.6 kGy in imported navel oranges is optimum for minimizing quality changes and disinfestation treatment simultaneously.

전자선 조사에 의한 수입 오렌지의 품질 특성을 조사하여 방사선 식품 검역 관리의 기초자료로 활용하기 위하여 미국산 Navel orange에 선량 0.2, 0.4, 0.6, 0.8, 1.0 kGy의 전자선을 조사하여 저온($3{\pm}2^{\circ}C$)에서 45일간 저장하면서 이화학적 품질 특성을 조사하였다. 색도, 당산비, 총당 및 환원당 함량, 비타민 C 함량은 조사선량과는 관계없이 저장기간에 따른 변화를 보였다. 경도는 저장 초기에 1 kGy의 조사구에서 유의적으로 감소하였다가 저장 후기에는 그 차이가 점차 감소하며 비조사구와 다른 조사구가 유사한 경향을 나타냈다. 관능평가에서는 신맛과 조직감을 제외한 모든 항목에서 조사선량과 저장기간이 증가할수록 감소하였고, 0.8 kGy 이상의 조사구는 색을 제외한 모든 항목에서 낮은 선호도를 보였다. 1 kGy 이하의 전자선 조사는 오렌지의 이화학적 품질 특성에 큰 영향을 미치지 않는 것으로 나타났으나 0.8 kGy 이상의 전자선 조사가 관능적 품질 특성에 좋지 않은 영향을 미치는 것으로 보아 품질변화를 최소화하는 동시에 해충 방제 효과를 얻기 위한 최적의 선량은 0.6 kGy 이하로 판단된다.

Keywords

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