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ESR Spectroscopy에 의한 전자선 조사 건조 채소의 검지와 흡수선량 예측
정형욱(Hyung-Wook Chung),권중호(Joong-Ho Kwon) 한국식품영양과학회 1999 한국식품영양과학회지 Vol.28 No.4
전자선 조사된 건청경채를 대상으로 ESR spectroscopy를 이용하여 전자선 조사 여부의 확인과 흡수선량의 예측을 시도하였다. 전자선 조사 건청경채는 2.0014와 2.0091의 g-value를 가지는 특유의 ESR signal을 나타내었다. 이 signal의 강도는 선량에 의존적으로 증가하였으나(R²=0.9584) 비조사구의 ESR signal은 특이한 peak를 나타내지 않았다. 비조사 시료들의 ESR threshold value 최대값은 1.45이었고, 전자선 조사된(2.5kGy) 시료의 최저값은 20.35로 대단히 큰 차이를 보여 주었다. 이상의 threshold value를 바탕으로 50개의 미지시료에 대한 검지시험을 실시한 결과, 미지시료 중 36개 시료의 ESR intensity는 20.35 보다 크게 나타나 전자선 조사된 것으로, 나머지 14개 미지시료는 ESR intensity가 1.45보다 작아서 전자선 조사되지 않은 것으로 각각 판정하였다. 이 결과는 미지시료 제공기관의 조사기록과 대조하여 보았을 때 100%의 정확도가 인정되었다. 미지시료 중 전자선이 조사되었다고 판정된 시료를 대상으로 dose-effect curve를 작성하고 3가지 희귀식으로 흡수선량을 예측한 결과 4kGy와 7kGy 범위의 조사선량에서 적용가능성이 낮았다. Along with the increasing demands for food irradiation technology, proper detection methods for controlling irradiated foods are required. Dried vegetable(chunggyungchae), which is permitted to be irradiated in Korea, was subjected to a detection study by ESR spectroscopy. Pre-established threshold value was successfully applicable to the detection of 50 coded unknown samples of dried clean vegetables, both nonirradiated and electron beam-irradiated. Three calibration curves obtained from the samples irradiated at 2.5~15 kGy were not practically adopted to estimate actual absorbed doses ranging from 4 to 7 kGy.
점도측정법을 이용한 방사선 조사 건조농산품의 검지 가능성
정형욱(Hyung-Wook Chung),정재영(Jaeyoung Jeong),권중호(Joong-Ho Kwon) 한국식품영양과학회 1999 한국식품영양과학회지 Vol.28 No.5
방사선 조사된 건조채소류, 인삼, 향신료 등을 대상으로 시료의 전분 함량과 점도를 측정함으로써 방사선 조사 여부 확인방법을 연구하였다. 대상 시료 10종의 전분함량은 15.64~60.86% 범위로 전분함량과 점도의 크기는 비례하지 않았다. 양배추, 당근, 청경채, 마늘, 버섯, 파, 고춧가루 등은 감마선 조사선량과 점도의 변화간에 유의성을 보이지 않았으나 건생강(R²=0.9271), 백삼(R²=0.6223) 및 건양파(R²=0.7909)는 유의적인 관계를 나타내었다. 따라서 방사선 조사선량의 증가에 따라 점도가 비례적으로 감소하는 생강과 인삼을 대상으로 조사 여부 판정을 위한 specific parameter를 설정하였다. 생강과 인삼 시료에 대한 비조사구의 specific parameter는 13.31과 13.93이었고, 감마선과 전자선 조사 시료(2.5 kGy, 최저 실용선량)의 specific parameter는 생강이 11.92와 11.15, 인삼이 4.40과 5.10으로 나타났다. 이상의 결과에서 볼 때 생강, 인삼 등 전분질 식품은 방사선 조사선원에 관계없이 specific parameter의 변화가 유의적임이 확인되어 미지시료의 방사선 조사 여부 검지에 활용가능성이 인정되었다. Dried vegetables, white ginseng and spices, which were exposed to gamma and electron-beam irradiation, were used in a detection study by measuring their starch content and viscosity change. The samples tested showed different levels of starch content(15.64~60.86%), which was not directly proportional to the viscosity of the samples. The correlation coefficients between irradiation dose and viscosity change were lower in the samples, such as cabbage, carrot, clean vegetable(Chunggyungchae), garlic, mushroom, green onion, and red pepper, while some higher coefficients were found in ginger(R²=0.9271), white ginseng (R²=0.6223) and onion (R²=0.7909). Thus, dried ginger and white ginseng were selected to be used for a detection of irradiated samples using specific parameters(threshold values). Specific parameter for the nonirradiated ginger and ginseng were 13.31 and 13.93, respectively. On the other hand, gamma and electronbeam irradiated samples at 2.5 kGy, the lowest dose for a commercial purpose, showed decreased values, 11.92 and 11.15 in ginger, and moreover 4.40 and 5.10 in ginseng. It is expected that a proportional decrease in a specific parameter with the absorbed doses will be a potentially useful index for detecting whether starchy foods have been irradiated or not.
위해성평가에 근거한 농산물 중 22종 농약의 잔류허용기준설정
정형욱 ( Hyung Wook Chung ),하용근 ( Yong Geun Ha ),임무혁 ( Moo Hyeog Im ),신지은 ( Ji Eun Shin ),도정아 ( Jung Ah Do ),오재호 ( Jae Ho Oh ),조재호 ( Jae Ho Cho ),권기성 ( Ki Sung Kwon ),박선희 ( Sun Hee Park ) 한국환경농학회 2011 한국환경농학회지 Vol.30 No.2
BACKGROUND: Food Sanitary Act establishes Maximum Residue Limits (MRLs) of pesticides in food that are newly registered and used per each quarter, as stipulated by Agro-chemical Control Act. Current Food Code contains the MRLs for a total of 418 pesticides in 184 food types. METHODS AND RESULTS: National MRLs for pesticides have been established by based on scientific data of good agricultural practice, acceptable daily intake (ADI), food intake, average body weight and others. MRLs for pesticides are generally set under the principle that theoretical maximum daily intake (TMDI) are always below ADI. As results, 27 MRLs in agricultural products were newly proposed for 22 pesticides (fungicide: azoxystrobin, fludioxonil, fluquinconazole, flusilazole, iprovalicarb, kresoxim-methyl, mandipropamid, metconazole, pyraclostrobin, tebuconazole, triflumizole, etc., Insecticide: dinotefuran, flubendiamide, indoxacarb, cyhalothrin, spinetoram, thiacloprid, thiamethoxam, metaflumizone, etc., Acaricide(miticide): cyenopyrafen, lufenuron) in 2010. CONCLUSION(s): There is no intake concerns for establishment of pesticide MRLs on foods in this time. Because the ratio of theoretical maximum daily intake (TMDI) are set below that of ADI.
시설재배 쑥갓 및 피망의 작물특성에 따른 Boscalid 및 Spinetoram의 잔류량 감소추이
황은진,박정은,도정아,정형욱,장희라,Hwang, Eun-Jin,Park, Jung-Eun,Do, Jung-Ah,Chung, Hyung-Wook,Chang, Hee-Ra 한국환경농학회 2017 한국환경농학회지 Vol.36 No.3
BACKGROUND: This study was performed to evaluate the residue dissipation of boscalid and spinetoram on crown daisy and sweet pepper affected by the morphology of the crop. The half-lives and dissipation rate constants for boscalid and spinetoram on crown daisy and sweet pepper were calculated. And then lower limit of 95% confidence interval for dissipation rate constant could be used to propose the pre-harvest residue limit. METHODS AND RESULTS: The pesticide products diluted according to the pesticide label were applied one time on crown daisy and sweet pepper at 2 field sites, respectively. Initial concentration of boscalid and spinetoram on crown daisy after application were in the range of 72.80~117.15 mg/kg and 2.82~4.67 mg/kg, respectively. And Initial concentration of boscalid and spinetoram on sweet pepper were in the range of 1.58~1.62 mg/kg and 0.10~0.21 mg/kg, respectively. Boscalid and spinetoram for crown daisy dissipted below the maximum residue limit(MRL) at 10 and 2 days after application, respectively. All residues concentration of boscalid and spinetoram for sweet pepper below the MRL at 0 day after application. The half-lives based on dissipation rate constant for boscalid and spinetoram on crown daisy were 4.2~4.9 days and 3.0~2.4 days respectively. And the half-lives for boscalid and spinetoram on sweet pepper were 6.7~7.0 days and 2.8~4.0 days respectively. CONCLUSION: The difference in initial concentration of boscalid and spinetoram among crop commodities were due to different crop morphology with larger surface areas. This study was suggested that pre-harvest residue limit would be calculated from lower limit of 95% confidence interval for dissipation rate constant and would be useful to protect consumers by controlling the pesticide residues in crop.