• 한국환경과학회:학술대회논문집
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• 한국환경과학회 2018년도 정기학술대회 발표논문집
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• pp.99-99
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• 2018

• 분석과학
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• 제33권5호
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• pp.215-223
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• 2020

The objectives of the present study were to assess the oxidative stability of South Korean n-3 (omega-3 fatty acid) supplements carried out from 2018 to 2019 and evaluate the influence of product characteristics on oxidative safety. A total of 76 n-3 supplements were analysed for oxidation safety by four markers, including acid value (AV), primary oxidation (peroxide value, PV), secondary oxidation (p-anisidine value, pAV) and total oxidation value (TOTOX). Among the supplements tested, 5.3 %, 55.3 %, 28.9 % and 46.1 % exceeded the international voluntary recommended levels for AV, PV, pAV and TOTOX, respectively. Purity (%) of products, remainder of expiration date (suggested shelf life), package in press through package (PTP) and products with additives had statistically significant differences oxidation assessment levels (p < 0.05). In addition, n-3 group found in Algae oil had significantly lower AV levels than the group that did not, and product with Alaska pollack oil, had significantly higher pAV levels than without group (p < 0.05). The high oxidation status of South Korean n-3 products in the present study could not be considered a public health problem right now. However, the levels of oxidation may affect a lot the efficacy and safety of using n-3 supplements. Thus, current oxidation safety limits should be reestablished by regulatory bodies to ensure the safety and efficacy of n-3 supplements, so that the standards could be applied to the products available to consumers.

• 한국환경과학회지
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• 제16권7호
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• pp.831-838
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• 2007

In order to improve the water environment at urban streams in Korea, several river restoration projects have been initiated for past few years. This study evaluates the impact of diverting water application at the riverhead of Onchun stream through the monitoring program for several water quality and ecological parameters. Various water quality parameters and ecological item such as benthic macroinverterates has been investigated between 09/05 and 12/06. Analysis indicates that the application of diverting water from Nakdong river to Onchun stream distinctly improved several water quality parameters such as, PH, BOD, TN, TP and concentrations of heavy metals. Low flow augmentation also improve ecological indicies such as the diversity index of benthic macroinvertebrates. Generally speaking, releasing addition water from head water of Onchun stream improves various water environmental characteristics.

• Fisheries and Aquatic Sciences
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• 제24권8호
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• pp.277-283
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• 2021

Kudoa septempunctata has been reported as a new parasite in aquacultured olive flounder Paralichthys olivaceus, and also as a causative agent of food poisoning in humans. This paper investigated the infection of K. septempunctata in 216 sashimi and 20 sushi made of olive flounders in Busan, Korea. Among 236 samples, K. septempunctata was detected in eleven sashimi with 6-7 polar capsules by the microscopy. Among eleven sashimi, five sashimi were positive in Polymerase Chain Reaction (PCR) assay with the targets of 18S rDNA and 28S rDNA. The genotype of all the five PCR results is identified as the genotype ST3 which is common in Korea. K. septempunctata was found in olive flounders sashimi from Samcheonpo and Wando outside of Jeju Island. These findings would contribute to establish the standard of K. septempunctata for preventing food-borne outbreaks in advance and providing further preventive management for the seafood safety.

• 생명과학회지
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• 제15권2호
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• pp.161-168
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• 2005

2001년부터 2003년까지 부산지역의 냉각탑수에서 분리한 L. pneumophila (serogroup 1) 39균주에 대해 제한효소 SfiI 처리한 경우 PFGE 양상은 dice coefficient $<65\%$의 유사성을 가진 band를 Awl로 10개의 pulsotype으로 나누었고, 가장 많았던 유형은 E pulsotype으로 39주중 18주로 $46.2\%$를 나타내었으며, 그 외 A pulsotype $17.9\%$, C pulsotype $15.4\%$, F pulsotype $7.7\%$ 및 B, D, G, H, I, J pulsotype이 각각 $2.6\%$로 유전적 양상이 다양하였다. 제한효소 NotI 처리한 경우 PFGE 양상은 dice coefficient $<60\%$의 유사성을 가진 band를 $a\~h$로 8개의 pulsotype으로 나누었고, 가장 많았던 유형은 f pulsotype이 $38.5\%$였으며 그 외 d pulsotype $20.5\%$, e pulsotype $17.9\%$, a pulsotype $10.3\%$, h pulsotype $7.7\%$ 및 b, c, g pulsotype이 각각 $2.6\%$를 차지하였다. 본 연구를 통하여 부산지역에서 분리되는 레지오넬라균에 대한 유전자 유형분석 결과를 데이터베이스화하여, 레지오넬라증의 집단 발생 또는 산발적인 질병 발생이 있을 경우 분자학적 측면에서 사람과 환경에서 분리된 균으로부터 감염원과 감염경로를 규명하는 역학적인 도구로써 이용 가능할 것으로 사료되었다.

• 한국동물위생학회지
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• 제31권1호
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• pp.17-29
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• 2008

In this study, antimicrobial resistance of E coli isolated from domestic beef on sale in Busan and Gyeongnam province was investigated from March to October 2007. A total of 600 beef samples were collected for the monitoring of antimicrobial resistance, and 92 (15.3%) strains of E coli were isolated. Antimicrobial resistance test was carried out by agar disc diffusion method with 17 antimicrobials. In general, E coli isolates showed the highest antimicrobial resistance to doxycycline (73.9%), followed by tetracycline (70.7%) andcefazolin (63.0%). Then they showed higher resistance to several antimicrobials like norfloxacin (48.9%). However, They had low antimicrobial resistance to amikacin (4.3%), colistin (1.1%). Of 92 isolates, 82 (89.1%) were resistant to more than 2 antimicrobials. Among 17 antimicrobials examined, tetracyclines were the most resistant, followed by cephalosporins, quinolone. The resistance was seemed to be correlated to amounts of antimicrobial use. In the result of this study, we suggest that there be need to regulate the abuse of antimicrobial on food-producing animals in Korea because the concern on antimicrobial resistant is gradually increased worldwide.

• 분석과학
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• 제35권1호
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• pp.15-23
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• 2022

Food delivery is gaining popularity due to changes in lifestyle and dietary patterns. However, packages used to delivery food may contain contaminants including heavy metals, or additives added during manufacturing process which may migrate into food during processing and transportation. In this study, a total of 58 food packages for delivery were collected and tested for migration of heavy metals (lead, cadmium and arsenic), bisphenol A and phenol into food simulants. The method was validated by evaluating linearity of calibration curve, limit of detection, limit of quantification, recovery and precision. Result of heavy metal migration showed that lead was the most frequently migrated metal and the highest concentration was detected in a polypropylene sample. Although there are no specific migration limits for bisphenol A and phenol in packaging materials tested in this study, migrations of bisphenol A and phenol were detected in some packages. This may due to contamination or additives added during manufacture of packages. Risk (%) was calculated to analyze the risk associated with the migration of heavy metals, bisphenol A and phenol, and was always below 1 %. These results showed that food packages for delivery are safe in terms of heavy metals, bisphenol A and phenol migration.

• 한국환경과학회지
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• 제15권3호
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• pp.287-292
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• 2006

The purpose of this paper is to evaluate the noise level and source, reduce the subway line II noise. As a result of measurement of subway line II in Busan the highest value section of uproad line was from Jigegol to Motgol by 89 dB(A). The sections of conversation and listening interference(over 80 dB(A)) were 21 sections(55%) of 38 sections. Among these sections, 15 sections(71%) were produced rolling noise, 3 sections(14%) squeal noise, 2 sections(10%) braking noise and 1 section(5%) fan noise, and then a main noise source was the rolling noise. In case of downroad line, the highest value section was from Busan Metro Art Museum to Centum city, Motgol to Jigegol by 88 dB(A). The sections of conversation and listening interference(over 80 dB(A)) were 18 sections(47%) of 38 sections. Among these sections, 15 sections(83%) produced rolling noise, 2 sections(11%) squeal noise and 1 section(6%) braking noise were investigated in this study. and then a main noise source was the rolling noise.

• 한국식품위생안전성학회지
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• 제35권3호
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• pp.219-224
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• 2020

본 연구는 2018년 10월에서 2019년 9월까지 부산지역 유통 판매되고 있는 872건의 다양한 식품을 대상으로 B. cereus 오염도를 분석하였다. 총 872건 중 78건(8.9%)에서 B. cereus 검출되었으며 식품별 B. cereus 검출률은 김치·절임·조림·젓갈류에서 23.9%, 조미식품 19.4%, 바로 섭취가능한 농산물 10.5%, 조리식품 7.3%, 즉석섭취식품 5.6%, 신선편의식품 5.0%, 즉석조리식품 0.0% 순으로 분포하였으며 통계적으로 유의한 차이가 있었다. B. cereus 오염 수준은 불검출에서 최대 20,000 CFU/g로 평균 48 CFU/g였으며, 식품별 B.cereus 오염도에는 차이가 없었다. 78건의 검체에서 분리된 113주의 B. cereus의 독소 유전자 확인 시험을 수행하였다. 식품에서 분리된 113주를 대상으로 B. cereus 독소유전자 확인 결과 최소 1종류에서 최대 5종류의 독소 유전자가 검출되었으며 총 18개 profile로 분류되었다. 장독소 5종(Cytk-nheA-entFM-bceT-hblC)을 모두 보유한 경우가 34주(30.1%)로 가장 많았다.

• 한국환경보건학회지
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• 제42권4호
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• pp.255-265
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• 2016

Objectives: Mobile phones have become one of the most essential accessories in daily life. However, they may act as reservoir of infectious pathogens if they are used without hygienic practices in their handling. Therefore, this study aimed to isolate food-borne pathogens from mobile phones and investigate the characteristics of toxin genes and antibiotic susceptibility patterns. Methods: A total of 146 mobile phones were collected from 83 middle- and 63 high-school students in Busan. The surfaces of the mobile phones were aseptically swabbed. Results: Among the food-borne pathogens, Staphylococcus aureus, Bacillus cereus and Escherichia coli were detected in 26 (17.8%), 20 (13.7%) and four (2.7%) samples, respectively. There were no statistically significant differences according to school level, gender or phone type. None of four E. coli strains had pathogenic toxic genes. All of the B. cereus strains carried at least three different toxin genes among the nine enterotoxin and emetic toxin genes. Three out of 20 B. cereus strains (15%) possessed emetic toxin genes, which are rarely detected in food-poisoning cases in Korea. Among the 26 strains of S. aureus, the detection rate of staphylococcal enterotoxin genes, toxic shock syndrome toxin (tsst) and factors essential for methicillin resistance (femA) were 84.6%, 7.7% and 100%, respectively. In the antibiotic susceptibility test, there was no methicillin-resistant S. aureus (MRSA) or vancomycin-resistant S. aureus (VRSA). Conclusion: The results show that students' mobile phones in Busan were contaminated by food-borne pathogens which carried various toxic genes. Therefore, regular phone disinfection and hand hygiene is important in order to reduce cross-contamination.