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Molecular typing of Listeria monocytogenes using pulsed-field gel electrophoresis (PFGE) (Pulsed-field gel electrophoresis (PFGE)를 이용한 Listeria monocytogenes의 molecular typing)

  • Chae, Hee-Sun;Kim, Ju-Young;Kim, Yoen-Ha;Yang, Yun-Mo;Jin, Kyong-Sun;Shin, Bang-Woo;Lee, Jung-Hark
    • Korean Journal of Veterinary Service
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    • v.30 no.3
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    • pp.353-362
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    • 2007
  • A total of 1,354 samples was collected from bovine and porcine carcass from January 2005 to December 2006 in a slaughter house. Twenty five strains(1.8%) of Listeria monocytogenes were isolated from 1,354 samples using selective media. Ten(1.4%) L monocytogenes were isolated from the 677 of bovine carcasses, and 15(2.2%) were isolated from the 677 of porcine carcasses. Among 15 L mono-cytogenes from porcine, 11 siolates were serovars 1/2c, followed by 1/2b (3 strains, 20.0%) and 1/2a(1 strain) Out of 10 bovine samples, positive cases in 1/2a were 9 strains (90.0%), 1/2b were 1 strains(10.0%). PCR primers were selected to amplify a 520-base pair(bp) DNA fragment from the listeolysin O gene (hlyA) of L mono-cytogenes. A 520-bp product was detected in PCR with DNA from L monocytogenes, but not from the other Listeria species tested. A total of 25 L monocytogenes strains were analysed by PFGE after digestion with Apa I. PFGE analysis of genomic DNA showed the $14{\sim}18$ fragments ranging in size from 30 to 550 kb, resulting in 14 patterns.

Analysis of Sulfur Dioxide Residue in Commercial Medicinal Herbs in Seoul (2009) (2009년 서울지역 유통 한약재의 이산화황 잔류실태 분석)

  • Yoon, Yong-Tae;Lee, Sung-Deuk;Park, Ae-Sook;Shin, Young;Kim, Hwa-Soon;Kim, Yoo-Kyung;Choi, Byung-Hyun
    • Korean Journal of Medicinal Crop Science
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    • v.18 no.5
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    • pp.345-360
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    • 2010
  • This study was conducted to investigate the content of sulfur dioxide residues in medicinal herbs in Seoul in 2009. Sulfur dioxide in the samples were determined by Monnier-Williams's modified method. A total of 1,821 samples of 205 different types of herbs were collected from Kyung-Dong Herb markets and Oriental medicine hospitals in Seoul. Of these samples, 642 samples were domestic, and 1,179 samples were imported. Of the 1,821 samples, 61 (3.3%, 31 types) failed to meet the regulations for sulfur dioxide residues of KFDA in medicinal herbs. Among these 61 unsuitable samples, 17 (7 types) were domestic, and 44 samples (26 types) were imported. The content of sulfur dioxide in the domestic medicinal herbs ranged from 0 to 809 mg/kg, while those in imported medicinal herbs ranged from 0 to 4,481 mg/kg. Approximately 84.6% of the samples contained less than 10 mg/kg of sulfur dioxide and about 10.0% of samples contained more than 30 mg/kg of sulfur dioxide.

Evaluation of Removal Efficiency in Emission Pollutants by Air Pollution Prevention Facilities from Meat Grilled Restaurants - Focus on the Electrostatic Precipitator - (직화구이 음식점 방지시설의 오염물질 저감 효과 평가 - 전기집진방식을 중심으로 -)

  • Seo, Jang-Won;Kim, Young-Il;Lee, Hee-Sun;Kim, Ji-Hun;Kim, Young-Doo;Shin, Jin-Ho
    • Particle and aerosol research
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    • v.17 no.4
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    • pp.115-123
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    • 2021
  • The emission gas from meat grilled restaurants has unpleasant odor and sticky particulate matters (PM) in form of oil mist. This affects the residents living nearby. In oder to decrease the odor and PM, electrostatic precipitators (ESP) were installed at several restaurants by support of Seoul metropolitan government and emission characteristics of PM and odor were investigated. The removal efficiency of odor and PM at before- and after-ESP was that total hydrocarbon (THC), NH3, H2S, acetaldehyde, butyraldehyde were not much decreased. Total suspended particles (TSP) emitted from the vent was below the value of 7 mg/m3 regardless of the concentration of before-ESP and removal efficiency was in the range of 64 ~ 86%. The ratio of PM1.0 to PM10 of emission gas was over 0.9. So it was revealed that most PM of emission gas was PM1.0. The PM concentration in the air of the street near the vent was higher than another street due to the emission gas and the PM of indoor air of restaurant grilling meats was measured very high compared to outdoor air. So it needs more powerful ventilation of indoor air.

Simultaneous Determination of Non-steroidal Anti-inflammatory Drugs and Corticosteroids Added to Foods as Adulterants using LC-ESI-tandem Mass Spectrometry (LC/ESI-MS/MS를 이용한 식품 중 불법적으로 첨가된 비스테로이드성 소염진통제 및 스테로이드 의약품 동시분석)

  • Lee, Yongcheol;Park, Ju-Sung;Kim, Sung-Dan;Yang, Hye-Ran;Kim, Eun-Hee;Yi, Yun-Jung;Cho, Sung-Ja;Jo, Han-Bin;Kim, Jung-Hun;Chae, Young-Zoo
    • Journal of Food Hygiene and Safety
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    • v.28 no.3
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    • pp.247-251
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    • 2013
  • The objective of present study was to develop a simultaneous determination method of 5 medical compounds, including beclomethasone, dexamethasone, prednisolone, ketoprofen, phenylbutazone in foods, using LC-MS/MS. To optimize MS analytical condition of 5 compounds, each parameter was established by MRM mode. The chromatographic separation was achieved on a C18 column successfully, with a mobile phase made up of A (0.1% formic acid) and B (0.1% formic acid in acetonitrile), at a flow rate of 0.3 mL/min for 17 min with a gradient elution. LOD and LOQ of 5 compounds were in the range of 0.40~4.60 ng/mL and 0.81~11.46 ng/mL, respectively. As a result of analyzing the three concentrations of the standard mixture added to blank samples, the results showed that the mean recovery rate of 5 compounds was in the range of 81.52~103.83%, and RSD (%) of Intra- and Inter-day assay were 0.52-10.45. Since relatively fine selectivity, accuracy and reproducibility were shown in this qualified experimental method, it could be utilized efficiently to investigating those 5 compounds to see if it is added to food products illegally.

Studies on the Pollution of Heavy Metals in the Soils of Seoul Area (서울시 일원의 토양 중금속오염도 조사)

  • Kim Hong Je;Kim Youn Cheon;Lee Kwang Kuk;Park Sang Hyun
    • Journal of environmental and Sanitary engineering
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    • v.3 no.2 s.5
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    • pp.91-98
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    • 1988
  • This study was carried out to investigate the Pollution of heavy metals in Soil, collected from the 50 sampling sites in 1986. The results were as follows; 1. In the average contents of Cd, the highest value was 0.33mg/kg in the Industrial area, the lowest value was 0.06 mg/kg in the Greenbelt and 0.10-0.22mg/kg in the other areas. 2. In the average contents of Cu, the highest value was 33.46mg/kg in the Industrial area, the lawest value was 3.79mg/kg in the Greenbelt and 4.69-12.21mg/kg in the other areas. 3. In the average contents of As, the highest value was 1.80mg kg in the Residential area, the lowest value was 0.43mg/kg in the Greenbelt and 0.64-1.65mg/kg in the other areas. 4. In the average contents of Zn, the highest value was 29.84mg/kg in the out wall of Seoul, the lowest value was 17.32mg/kg in the Greenbelt and 19.62-26.71mg/kg in the other areas. 5. In the average contents of Pb, the highest value was 17.09mg/kg in the Industrial area, the lowest value was 5.21mg/kg in the Reclamated waste and 5.67 -14.10mg/kg in the other areas. 6. Distribution of Heavy metals was Zn>Cu>Pb>As>Cd and the relations of Zn-Cd, Pb-Cd, Pb-Cu, Pb-Zn were shown the correlation significantly (P< 0.01).

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Determination of Trace-Level Perchlorate by IC-MS/MS and Distribution in the Han River (IC-MS/MS를 이용한 수중의 과염소산이온 분석방법 최적화 및 한강수계내 분포조사)

  • Kim, Hyun-Hee;Han, Ihn-Sup;Jeong, Gwan-Jo;Park, Hyeon;Han, Sun-Hee;Cho, Wan-Seon
    • Journal of Korean Society of Environmental Engineers
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    • v.32 no.4
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    • pp.349-356
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    • 2010
  • Ion chromatography (IC) coupled with conductivity detector (CD) is a common system for the determination of perchlorate in water samples. Although the IC method with CD has been widely used for the determination of trace level perchlorate ion in water, sensitivity decreases dramatically as the complexity of the matrices increases. Here we proposed the application of ion chromatography coupled with mass spectrometry (IC-MS/MS) to significantly improve selectivity of perchlorate. The mean recovery of the method was 104.4 ${\pm}$ 5.7% and the relative standard deviation (RSD%) was 1.9 ${\pm}$ 1.3%. The alculated method detection limit (MDL) was 0.0207 ${\pm}$ 0.0099 ${\mu}g/L$. The concentrations of perchlorate were minimum <0.1 ${\mu}g/L$ and maximum 18.3 ${\mu}g/L$ in source water (Namhan, Bukhan and Han River). Hongreung showed higher concentrations ($1^{st}$-14.3 ${\mu}g/L$, $2^{st}$-18.3 ${\mu}g/L$) than the other places. And the concentrations of perchlorate were 0.18~0.34 ${\mu}g/L$ in the samples taken from the six water treatment plants and six intake stations in Seoul.

Biotype, serotype and antibiotics susceptibility of Yersinia enterocolitica isolated from zoo animals (동물원(動物園) 야생동물(野生動物)에서 분리(分離)한 Yersinia enterocolitica 의 생물형(生物型), 혈청형(血淸型) 및 항생제(抗生劑) 감수성(感受性))

  • Park, Seog-gee;Youn, En-sun;Kim, En-jung
    • Korean Journal of Veterinary Research
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    • v.34 no.1
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    • pp.85-91
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    • 1994
  • A study on the isolation of Yersiniae from the feces of wild animals(mammals 376, birds 19 and reptiles 13) in zoo and the biotype and serotype and susceptibility of 12 antibiotics was carried. Out of 408 animals, Yersiniae were isolated from 28 animals(6.9%). Of 28 isolates, 27 isolates(96.4%) were Y. enterocolitica and 1(3.6%) was Y. kristensenii. According to the species, 25(6.6%) of Y. enterocolitica and 1(0.3%) of Y. kristensenii were isolated from 376 mammals, 2(15.4%) of Y. enterocolitica from 13 reptiles but not isolated from 19 birds. According to the eating pattern, 8(5.2%) of Y. enterocolitica were isolated from 155 carnivora, 13(10%) of Y. enterocolitica from 123 herbivora, and 6(4.9%) of Y. enterocolitica and 1(0.8%) of Y. enterocolitica from 123 omnivora. Out of 27 isolates of Y. enterocolitica, all were biotype 1. And predominant serotype was 0:21(40.7%), and 0:5(37.0%), 0:6(11.1%), 0:1(3.7%), 0:9(3.7%) and untypable(3.7%). Yersiniae isolated from zoo animals were resistant to cephalothin(100%), ampicillin(96.4%), carbenicillin(96.4%) and tetracycline(14.3%) and streptomycin(3.6%) and susceptible to chloramphenicol(100%), colistin(100%), gentamicin(100%), kanamycin(100%), nalidixic acid(100%), polymyxin B(100%) and tobramycin(100%). The predominant multiple resistance pattern was Am-Cf-Cb(82.1%), and Am-Cf-Cb-Te(10.7%) and Am-Cf-Cb-Te-Sm(3.7%).

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Contents of Sodium, Potassium and Food-borne Pathogens Contamination of Side Dishes Distributed in Seoul Area (서울지역 유통 반찬류의 나트륨, 칼륨 함량 및 식중독균 오염도 조사)

  • Hwang, In-Sook;Jang, Mi-Ra;Kim, Ouk-Hee;Lee, Sung-Deuk;Park, Young-Ae;Choi, Bu-Chul;Lee, Kyeong-Ah;Kim, Li-La;Kim, Dong-Kyu;Jung, Ae-Hee;Oh, Young-Hee;Kim, Jung-Hun;Jung, Kweon
    • Journal of Food Hygiene and Safety
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    • v.32 no.1
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    • pp.35-41
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    • 2017
  • To determine the contents of sodium and potassium in side dishes, 92 samples from 22 different kinds of side dishes that can be classified into 3 groups were collected in Seoul area and analysed using ICP-OES. The highest sodium content was detected in pepper doenjang muchim, while potassium content was the highest in kong jorim. When comparing the content of sodium and potassium in 3 groups, namely namul, muchim, and jorim, the sodium content of namul group was significantly different from those of jorim and muchim (p-value < 0.05). Sodium intake per serving size was the highest in parae muchim among the samples as estimated to 20.2% of WHO recommendation that is 2,000 mg/day. The amount of sodium by simultaneously intake of soybean sprouts namul, anchovy jorim and parae muchim per one serving size was estimated to 1,000 mg. The potassim/sodium ratios of spinach namul and kong jorim were 1.70 and 0.81, respectively, while that of bracken namul was very low as about 0.1. Food-borne pathogens were not detected out of 92 side dishes.

Comparison between the liquid-liquid partition method and modified QuEChERS method for the analysis of pesticide residues in beef fat (소지방 중 잔류농약분석을 위한 액-액분배법과 modified QuEChERS법 비교)

  • Kim, Yoen-Joo;Choi, Yoon-Hwa;Shin, Bang-Woo;Lee, Jung-Hark
    • Korean Journal of Veterinary Service
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    • v.34 no.4
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    • pp.429-439
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    • 2011
  • This article described the comparison of a quick, easy, cheap, effective, rugged and safe (QuEChERS) sample preparation and the classical method established by National Veterinary Research and Quarantine Service (NVRQS) for the determination of pesticide residues in livestock products using GC-tandem mass spectrometry. The classical method by NVRQS used liquid-liquid partioning followed by evaporizing. The modified QuEChERS entailed extraction of 2 g sample with 15 ml acetonitrile containing 1% acetic acid followed by addition of 6 g anhydrous magnesium sulfate and 1.5 g sodium acetate. After centrifugation, 6 ml of the extract underwent a cleanup step (in a technique known as column-based solid phase extraction) using 400 mg each of $C_{18}$ and primary secondary amine sorbents plus 1,200 mg magnesium sulfate. The quantitation of individual pesticides by both methods was based on tissue standard calibration curves with a correlation coefficient in excess of 0.98 for the 24 pesticides. The detection limits by the classical method were ranged 1.3~5.0 ${\mu}g$/kg, with mean recoveries between 76.2% and 114.3% except aldrin (59.3%) and deltamethrin (63.6%). The detection limits by modified QuEChERS were ranged 0.3~6.2 ${\mu}g$/kg, with mean recoveries between 68.0% and 114.3% except dimethipin (152.6%), chlorfenvinphos (138.1%), 4,4-DDT (61.5%), aldrin (60.4%) and chinomethionate (30.3%).

Sugar and Sodium Content of Franchise Chickens and Market Chickens (프랜차이즈 치킨과 대형마트 내 판매 치킨의 당과 나트륨 함량 조사)

  • Lee, Young-Ju;Jung, So-Young;Kim, Nam-Hoon;Park, Young-Ae;Jo, Ju-Yeon;Kim, Youn-Cheon;Lee, Sang-Me;Kim, Moo-Sang
    • Journal of Food Hygiene and Safety
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    • v.35 no.2
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    • pp.118-124
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    • 2020
  • We investigated the content of sugar and sodium in 4 types of chicken (fried, seasoned, soy sauce-flavored, cheese powder-flavored). A total of 123 samples were collected from franchise stores and markets in Seoul. The sugar content of chicken samples was analyzed by HPLC-ELSD (High Performance Liquid Chromatography-Evaporative Light Scattering Detector). The average sugar content of seasoned chicken was highest at 8.7±2.3 g/100 g while that of fried chicken was lowest at 0.6±0.3 g/100 g. The average content of sugar sorted by place of sale showed a significant difference (P<0.05). The sodium content in chicken samples was analysed using the ICP-OES (Inductively Coupled Plasma-Optical Emission Spectrometry). The sodium content of seasoned chicken with cheese powder was the highest at 627.0±109.2 mg/100 g and that of fried chicken was the lowest at 448.0±65.3 mg/100 g. The sugar content of seasoned chicken sold in both franchise stores and markets was found to exceed the 50 g daily level as recommended by the WHO. In addition, the average sodium content in seasoned chicken (franchise stores and markets) and cheese-powdered chicken was more than twice as high as the daily 2,000 mg recommended by the WHO.