Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Potential Detection and Quality Properties of ${\gamma}-Irradiated$ Corn Starch of Korean and Chinese Origins by Viscosity Measurement during Storage

저장 기간 중 감마선 조사 옥수수 전분의 검지를 위한 점도 측정법의 적용과 품질특성

  • Published : 2003.04.01
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Abstract

Physicochemical changes in corn starch caused by irradiation were investigated, and irradiated samples were identified. Viscosity, TBA value, Hunter color, and total viable count were measured after irradiation of corn starch. Corn starches from Korea and China were irradiated at 0, 2.5, 5, 7.5, 10, and 15 kGy using a $Co^{60}$ irradiator and stored for 9 months at $0^{\circ}C$ and $20^{\circ}C$. Viscosity and specific parameter values decreased in all samples with increasing irradiation dosage at 50 rpm, showing a dose-dependent relationship $(above\;R^2=0.80)$ between non-irradiated and irradiated samples during storage. These results suggest that detection of irradiated corn starches is possible using viscometric method during storage. Total viable count, TBA value, and Hunter color were determined as supplemental indices for measuring viscosities of samples. Total viable count and TBA values showed dose-dependent relationship $(2.5{\sim}15 kGy)$. Differences in viscosity and total viable count, and TBA values among non-irradiated samples showed little changes with the lapse of post-irradiation time, but were still distinguishable for more than 6 months at $0^{\circ}C$ and $20^{\circ}C$ for corn starches from korea and China.

감마선 조사한 국산 및 중국산 옥수수 전분의 저장 중 감마선 조사여부 확인 가능성과 품질 변화를 확인하였다. 점도 측정법을 이용한 검지가능성 시험에서 시료의 점도는 조사 선량에 따라 조금씩 감소하였고, $0^{\circ}C$ 및 $20^{\circ}C$에서 9개월간 저장 중에도 비조사구와 조사구 간의 구분이 가능하였다. Specific parameter를 설정한 결과, 조사처리에 따라 그 값이 감소하여 조사 여부의 확인이 가능하였으며, 조사선량과 specific parameter 간의 상관성은 저장 중 $R^2$값이 0.89이상으로 높게 나타나 조사여부의 검지에 활용할 수 있을 것으로 생각되었다. TBA가는 감마선 조사선량에 비례하여 저장 기간에 따라 유의적으로 증가하였으며, Hunter a값은 조사선량과 유의적인 상관을 나타내었다. 이상과 같이 specific parameter를 이용한 점도측정법은 감마선 조사 후 저장 중에도 조사여부의 screening에 적용이 가능할 것으로 판단되었으며, TBA가의 측정은 판정의 정확도를 높여주는 보조수단으로 기대된다.

Keywords

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