• Food Industry And Nutrition
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• v.10 no.2
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• pp.26-31
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• 2005

천연물 유래 기능성 물질 탐색의 일환으로 녹차 추출물의 산업적 적용을 용이하게 하기 위하여 감마선 조사를 병용하여 추출물의 색도 및 라디칼 소거능을 확인하고, 이 추출 파우더를 돈육 패티에 적용하여 항산화, 색도 및 관능검사를 통해 기호도를 조사하였다. 생리활성을 가지는 녹차 잎 추출물의 라디칼 소거능은 $68.2\%$를 나타냈으며, 20 kGy로 조사했을 경우 비조사구와 큰 차이를 나타내지 않았다. 또한, 감마선조사에 의한 색도의 변화는 감마선 조사 후 $L^{\ast}-value$는 증가했고, $a^{\ast}$- 및 $b^{\ast}-value$는 감소하는 것으로 확인되었다. 또한, 녹차 잎 추출 파우더를 돈육 패티에 적용해본 결과 비첨가구에 비해 라디칼 소거능 및 지질 산화를 지연시키며, 조사된 녹차 잎 추출 파우더를 첨가한 돈육패티가 비첨가구 혹은 비조사된 녹차 잎 첨가구에 비해 저장 기간에 따라$L^{\ast}-value$가 높게 나타났다. 또한, 모든 처리구에서 관능적으로도 큰 차이를 보이지 않았다 그러므로 천연물 유래 녹차 추출물 파우더는 돈육 패티의 기능성 첨가제로서 우수하며, 감마선 조사는 녹차 잎 추출 파우더의 산업적 적용을 용이하게 하는 방법 중의 하나라고 사료된다.

• Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
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• 2007.11a
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• pp.190.1-190.1
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• 2007

• Korean Journal of Food Science and Technology
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• v.24 no.1
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• pp.65-69
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• 1992

The comparative effects of ethylene oxide(EO) fumigation and gamma irradiation (5 kGy) were determined on the chemical components of exportable ginseng-leaf tea which is required for improving the hygienic quality. Saponins and fatty acids detected in the samples were found to be resistant to both treatments at the practical levels. In an experiment on free sugar and amino acids, however, quantitative analysis has shown that glucose, lysine and histidine in the samples are significantly decreased by EO fumigation (p<0.05) and that negligible changes were observed in gamma-irradiated samples.

• Korean Journal of Food Science and Technology
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• v.28 no.3
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• pp.514-520
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• 1996

The purpose of this study was to develop the production technology of modified starch. Corn starches were gamma irradiated at 0-110 kGy and the effect of irradiation dose levels on the physicochemical properties of corn starches were investigated. Blue value linearly decreased, while alkali number and solubility markedly increased as irradiation dose levels were increased. The optical transmittance increased as applied irradiation dose levels were increased in the temperature range of $65-95^{\circ}C.$ Water binding capacity and swelling power showed maximum value at 30 and 10 kGy, respectively and they tended to decrease thereafter. Gelatinization viscosity of the gamma irradiated starch considerably decreased as compared to that of the non-irradiated starch. Irradiation at 110kGy resulted in a marked reduction of peak viscosity and cooling viscosity at $30^{\circ}C$ by 100 and 300 times, respectively. The physicochemical properties of corn starch irradiated at 30 kGy were similar to those of commercial acid-modified starch, while those of corn starch irradiated at 100 kGy were similar to those if oxidized starch.

• Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
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• 1999.04a
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• pp.29-52
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• 1999

본 연구는 강원도 고랭지에서 자생되는 산채류를 이용하여 총질소함량을 기준으로 소맥대신 이들 산채류를 일정비율로 대체하여 더덕 및 산채혼합 간장을 제조하여 그 특성을 조사하였으며 또한, 감마선조사 또는 블랜칭처리가 참나물 즙액의 선도유지연장에 미치는 영향을 조사하였다. 제조된 간장의 총 질소함량은 일반적으로 산채 대체량의 증가에 따라 증가하였다. 숙성 4개월 후의 무기질 함량에 있어 더덕 20% 대체간장은 Ca, K 함량이 각각 1.3배, 1.5배의 증가율을 나타내었으며, 산채 혼합 10% 대체간장도 Ca 함량이 1.5배 증가하였다. 대체량 별로 아미노산 함량 변화를 살펴보면 더덕간장 10% 대체군의 경우 threonine과 aspartic acid가, 산채 혼합 10% 대체군은 tyrosine과 arginine이 높은 증가율을 나타내었다. Rec assay system을 이용한 항돌연변이 시험에서, 더덕간장은 10%와 20% 대체군이, 산채혼합 간장은 7%와 10% 대체군이 다른 시료에 비해 높은 항돌연변이성을 나타내었다. 관능검사 결과, 전체적 기호도에 있어 더덕간장은 7% 대체군, 산채혼합 간장은 5% 대체군이 가장 우수하였다. 미생물의 생육변화는 감마선 조사를 하였을 때 두처리구 모두 0.5 kGy 조사에서도 무처리구에 비하여 현저한 생육감소를 나타내었으며 감마선 처리된 녹즙을 저온에서 저장하였을 때는 미생물의 생육억제효과가 높았으나 상온에서는 감마선 효과가 매우 감소함을 나타내었다. 색도변화는 블랜칭한 녹즙이 블랜칭하지 않은 녹즙보다 색깔이 훨씬 선명하고 맑은 녹색을 띄었으며 시간이 경과함에 따라 감마선 조사구가 시간이 경과함에 따라 무처리구에 비하여 L값, a값 및 b값이 훨씬 적게 변화함을 나타내었다. 비타민 C의 변화는 블랜칭 처리한 녹즙의 비타민 C의 함량변화는 블랜칭 처리를 하지않은 녹즙보다 적었으며 감마선 처리구와 거의 차이가 없었으며 온도가 낮을수록 두 처리구 모두 비타민 C의 손실율이 적게 나타났다. 감마선을 조사하였을 때 블랜칭하지않은 녹즙에서는 무처리구와 비교하여 볼 때 밝기, 풀냄새, 쓴맛, 신선감 및 수용성에서 차이가 없었으며 블랜칭한 녹즙에서는 무처리구가 감마선처리구에 비하여 풀냄새와 쓴맛이 증가하였고 신선감과 수용성이 감소되었다.

• Toxicological Research
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• v.13 no.1_2
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• pp.55-60
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• 1997

Gamma irradiation was applied to Angelicae gigantis radix and Aloe to improve their hygienic quality. The effective dose of irradiation was 7 kGy in Angelicae gigantis radlx and 5 kGy in Aloe for the sterilization of all contaminated microorganisms tested. After 8 months of storage at room temperature, no growth of microorganisms was observed in the irradiated products. The safety of these products were evaluated by Salmonella typhimurium reversion assay and in vivo micronucleus assay using mouse bone marrow cells. They were negative in the bacterial reversion assay with S. typhimurium TA 98, TA100, TA1535 and TA1537. In the in vivo mouse micronucleus assay, they did not show any clastogenic effect at all doses tested. These results indicate that the gamma irradiation of Angelicae gigantis radix at 12 kGy and of Aloe at 10 kGy have no genotoxic effects under these experimental conditions.

• Food Science and Preservation
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• v.8 no.2
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• pp.193-198
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• 2001

Gamma irradiation at 20 kGy was apploed to salted and fermented shrimps to evaluate its possible genotoxicity. The genotoxicity of irradiated salted and fermented shrimps was evaluated by Salmonella typhimurium reversion assay, chromosomal aberration test and in vivo micronucleus assay. The results were negative in the bacterial reversion assay with S. typhimurium TA98, TA100. No mutagenicity was detected in the assay both with and without metabolic activation. In chromosomal aberration tests with CHL cells and in vivo mouse micronucleus assay, no significant difference in the incidences of chromosomal aberration and micronuclei was observed between nonirradiated and 20 kGy-irradiated salted and fermented shrimps. These results indicate that salted and fermented shrimps irradiated at 20 kGy did not show any genotoxic effects under these experimental conditions.

• 한국신재생에너지학회:학술대회논문집
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• 2011.05a
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• pp.150.2-150.2
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• 2011

Unlike non-ionic clathrate hydrates stably formed by van der Waals interaction between a guest molecule and a surrounding host framework, ionic clathrate hydrates are stabilized by ionic interaction between an ionic guest molecule and the host water-framework. Here, we firstly described the stable entrapment of the superoxide ions in ${\gamma}$-irradiated $Me_4NOH+O_2$ hydrate. Owing to peculiar direct guest-guest ionic interaction, the lattice structure of ${\gamma}$-irradiated $Me_4NOH+O_2$ hydrate shows significant change of lattice contraction behavior even at relatively high temperature(120K). Particularly, we note that ionic-induced dimensional change is much greater than thermal-induced change. Such findings are expected to provide useful information for a better understanding of unrevealed nature of clathrate hydrate fields.

• Journal of the Korean Society of Food Science and Nutrition
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• v.28 no.5
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• pp.1092-1098
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• 1999

Gamma irradiation was applied to pork for improving its hygienic quality and evaluating its possible genotoxicity. The effective dose of irradiation was 3 kGy in pork for the sterilization of all contaminated microorganisms tested. After 8 weeks of storage at 5oC, no growth of microorganisms except for psychrophile and total aerobic bacteria was observed in the more than 3 kGy irradiated pork. The genotoxicity of high dose irradiated pork(30 kGy) was evaluated by Salmonella typhimurium reversion assay, chromosomal aberration test and in vivo micronucleus assay. The results were negative in the bacterial reversion assay with S. typhimurium TA98, TA100, TA1535, TA1537. In chromosomal aberration tests with CHL cells and in vivo mouse micronucleus assay, no significant difference in the incidences of chromosomal aberration and micronuclei was seen between nonirradiated and 30 kGy irradiated porks. These results indicate that 30 kGy irradiated pork did not show any genotoxic effects under these experimental conditions.

• Journal of the Korean Society of Food Science and Nutrition
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• v.26 no.5
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• pp.952-957
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• 1997

The three medicinal herbs-Curcuman longa Linne, Paeonia japonica Miyabe, Scutellaria baikalensis George-irradiated with gamma rays were tested for their possible genotoxicity. The methanol-soluble and water-soluble fractions of the 10kGy gamma-irradiated herbs were examined in cultured Chinese hamster ovary(CHO) cells for their ability to induce micronuclei. No mutagenicity of each test material was detected in the assay with or without metabolic activation. The safety of the herbs irradiated with gamma rays at practical doses needs further investigations using in vivo genotoxicity and chronic and reproductive toxicity tests.