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패류 중 자연정화 및 인공정화에 의한 위생지표세균의 변화
오은경 ( Eun Gyoung Oh ),유현덕 ( Hyun Duk Yoo ),유홍식 ( Hong Sik Yu ),하광수 ( Kwang Soo Ha ),신순범 ( Soon Bum Shin ),이태식 ( Tae Seek Lee ),이희정 ( Hee Jung Lee ),김지회 ( Ji Hoe Kim ),손광태 ( Kwang Tae Son ) 한국수산과학회(구 한국수산학회) 2012 한국수산과학회지 Vol.45 No.1
In coastal areas that are affected by continuous, seasonal or occasional pollution sources, bivalves accumulate biological contaminants such as pathogenic bacteria. We investigated the effect of natural seawater relaying and electrolyzed seawater depuration on the bacteriological quality of artificially contaminated oysters Crassostrea gigas and short-necked clams Ruditapes philippinarum to suggest an alternative method of shellfish sanitation control.When artificially contaminated oysters and short-necked clams (fecal coliform level 1,700 MPN/100 g) were relayed into a sea area of safe bacteriological water quality, the fecal coliform level dropped to below 110 MPN/100 g after 1 day. The bacteriological quality of oysters and short-necked clams that are contaminated at a fecal coliform level of 1,700 MPN/100 g could be improved, and become appropriate for raw consumption by a single day relay under proper environmental conditions. When artificially contaminated oysters (fecal coliform level 330 MPN/100 g) were depurated with electrolyzed seawater, 94% of fecal coliform was eliminated after 12 h and fecal coliform was undetectable after 24 h. After 24 h depuration with electrolyzed seawater, the fecal coliform level of short-necked clams with initial fecal coliform of 2,400 MPN/100 g was below 20 MPN/100 g. However, the fecal coliform level of short-necked clams with initial fecal coliform of 17,000 MPN/100 g was relatively high, at 790 MPN/100 g, even after 24 h of depuration with electrolyzed seawater, because of the repeated cycle of excretion and accumulation of fecal coliform in shellfish tissue under the closed depuration environment. Such natural seawater relaying and electrolyzed seawater depuration can be restrictively applied to improve or secure the bacteriological quality of oysters and short-necked clams in accordance with safety levels for bivalves for raw consumption.
우리나라 주요 김 생산해역의 해수 및 물김에 대한 위생학적 평가
정상현,신순범,오은경,조미라,윤민철,이희정,손광태,Jeong, Sang Hyeon,Shin, Soon Bum,Oh, Eun Gyoung,Jo, Mi-Ra,Yoon, Min Chul,Lee, Hee Jung,Son, Kwang-Tae 한국수산과학회 2017 한국수산과학회지 Vol.50 No.4
Sanitary evaluation of seawater and Pyropia sp. laver collected from the five major laver growing areas in Korea was performed four times over the course of a year. The seawater quality in four of these five areas was regarded as the clean area according to Korean criteria, but the seawater at one investigation site in Seoheon area was found to exceed the standard for fecal coliform. In the bacteriological safety analysis of laver (raw source), the percentages of samples not conforming to Chinese criteria at the five sites were 55.6% (Seocheon), 70.0% (Shinan), 81.8% [Jindo (Haenam)], 63.6% (Wando), and 28.6% [Goheung (Jangheung)]. Pathogenic bacteria were not detected in all laver samples. The food safety of laver (raw source) based on heavy metal concentration was confirmed using Korean criteria; the concentrations of heavy metals in laver samples collected from the major laver growing areas were 0.008-0.632 mg/kg wet weight (ww) lead, 0.024-0.137 mg/kg ww cadmium, 0.908-2.892 mg/kg ww total arsenic, and 0.003-0.013 mg/kg ww total mercury. Therefore, pollution source management and periodic monitoring of heavy metals may be required to improve the food safety of laver produced in these laver growing areas.
통영시 연안의 양식굴(Crassostrea gigas)에서 검출된 노로바이러스의 정량분석
신순범 ( Soon Bum Shin ),오은경 ( Eun Gyoung Oh ),이희정 ( Hee Jung Lee ),김연계 ( Yeon Kye Kim ),이태식 ( Tae Seek Lee ),김지회 ( Ji Hoe Kim ) 한국수산과학회 2014 한국수산과학회지 Vol.47 No.5
Norovirus (NoV) is a major cause of food poisoning outbreaks in Korea. Most NoV outbreaks originate from envi-ronmental contamination, but bivalves such as oysters are also important vectors. Oyster Crassostrea gigas contami-nation by NoV has been reported in Korea, but no quantitative analyses of NoV have been performed. We investi-gated the NoV concentration in 21 oyster samples from a Korean commercial oyster-growing area with confirmed fecal contamination from January to December 2012, using real-time reverse transcription-polymerase chain reac-tion. Additionally, we assessed the NoV concentration after heating to investigate the effects of heat treatment on NoV-infected oysters. In NoV-positive samples, the cycle threshold (Ct) values were 37.43-39.41 and 36.77-39.30, while viral concentrations were 8.97×102-2.24×102 and 3.05×102-7.47×101 copies/g for genogroups I and II, respec-tively. After heat treatment, NoV genogroup I decreased by 83.4%, 88.0%, 89.4% and 100% at 60℃, 68℃, 70℃, and 100℃, respectively, for 15 min, while genogroup II respectively decreased by 67.3%, 76.3%, 80.1%, and 89.8% under the same conditions.
목종수 ( Jong Soo Mok ),오은경 ( Eun Gyoung Oh ),손광태 ( Kwang Tae Son ),이태식 ( Tae Seek Lee ),이가정 ( Ka Jeong Lee ),송기철 ( Ki Cheol Song ),김지회 ( Ji Hoe Kim ) 한국수산과학회(구 한국수산학회) 2012 한국수산과학회지 Vol.45 No.5
To compare the accumulation of paralytic shellfish poison (PSP) in different marine organisms, the occurrence and vailation of PSP were surveyed in blue mussel Mytilus edulis, oysler Crassostrea gigas, short neck clam Ruditapes philip-pinarum, bay scallop Argopecten irradians, and warty sea squirt Stvela clava collected from Jinhae Bay, Korea, in 2005 and 2006 year. We also investigated the ability of the blue mussel to detoxify PSP by relaying and depuration (via the water flow or water circulation system). In the marine organisms examined, PSP levels were the highest in blue mussel, followed in order by bay scallop, oyster, short neck clam, and warty sea squirt. Comparing the maximum PSP levels in the bivalve species examined in 2005 and 2006, PSP in blue mussel was 1.6-2.0, 4.0-5.9, and 5.1-6.0 times higher than in bay scallop, oyster, and short neck clam, respectively. Therefore, blue mussel could be useful as a bioindicator for PSP monitoring. With the increasing PSP levels in blue mussel in 2006, the proportion of PSP in its digestive gland increased to 95.1% when the maximum level was detected from the whole tissues of blue mussel on May 29. Subsequently, the PSP proportion in the digestive gland decreased as the PSP level in whole tissue decreased, The detoxification of PSI` in blue mussel was greatest with relaying, followed by the water flow, and water circulation systems, Relaying decreased the PSP level below the regulatory limit of 80ug/100g after 2 days in low toxic sample with 124ug/l00g, and after 7 days in high toxic sample with 401 pg /100 g. During depuration in the blue mussel with 401ug/100g via the water how system, the PSP amounts in the digestive gland decreased by about 50% after I day, and about 77% after 7 days. In contrast, the PSP amounts in the soft body, gill, and mantle did not change significantly with depuration.
한국 연안산 패류 중 Vibrio parahaemolyticus의 분포 및 항생제내성 특성 비교
유홍식 ( Hong Sik Yu ),오은경 ( Eun Gyoung Oh ),신순범 ( Soon Bum Shin ),박용수 ( Yong Su Park ),이희정 ( Hee Jung Lee ),김지회 ( Ji Hoe Kim ),송기철 ( Ki Cheol Song ) 한국수산과학회 2014 한국수산과학회지 Vol.47 No.5
The contamination status of Vibrio parahaemolyticus in commercially valuable shellfish from the south and west coasts of Korea and the antimicrobial resistance patterns of isolated V. parahaemolyticus were investigated from July through October, 2011. The range of V. parahaemolyticus concentrations in oysters Crassostrea gigas and short neck clams Venerupis philippinarum was <30~290 MPN/100 g and <30~46,000 MPN/100 g, respectively, and greater than 10,000 MPN/100 g of V. parahaemolyticus was detected from 7 of 40 short neck clams. During the survey period, 436 strains of V. parahaemolyticus were isolated (129 from oysters and 307 from short-neck clams) and the antimicrobial resistance patterns of all of the isolates were examined. Antimicrobial resistance against at least one antibiotic was seen in 79.8% of the oyster isolates (103 strains) and 63.8% of the short neck clam isolates (196 strains). The anti-microbial resistance patterns were relatively simple because the antimicrobial resistance of the isolates was simply due to resistance to ampicillin. Only one oyster isolate and three short neck clam isolates showed multiple antibiotic resistance, i.e., resistance against more than four antibiotics.