• 한국환경과학회지
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• 제20권5호
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• pp.575-580
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• 2011

This study characterized water quality of groundwater and purified water used for drinking water in 30 schools in Gyeongsangbukdo Province. The results of the study showed that 43% of groundwater and 45% of purified water were not suitable for drinking. Among them, microbial contaminations were the most serious problem. In raw groundwater, the exceeding rates of total colony counts was the highest in August (53.6%). Purified water samples showed higher rate of exceeding drinking water standard for total colony counts while showing lower rate of exceeding drinking water standard for total coliforms and fecal coliforms in March and August. Overall, proper managements for microbial contaminations are required for both groundwater and purified water. Furthermore, special attention should toward students not to drink water when groundwater or purified water exceeds the drinking water quality standard.

• 한국식품영양학회지
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• 제23권2호
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• pp.240-246
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• 2010

This study aimed to determine microbiological quality on vegetable salad used dressing added with Prunus mume extracts. For this study, Dressing were blended with Prunus mume extracts to different concentrations of 0, 10, and 20%. Microbiological effects of vegetable salad used dressing added with Prunus mume extracts were assessed during production process by measuring process time, temperature, pH and Aw and determining total plate counts and coliforms. Effects of vegetable salad used dressing added with Prunus mume extracts on total plate counts and coliforms were observed during holding at 3, $25{\pm}1^{\circ}C$ for 12 hours. Dressing added with Prunus mume extracts improved the microbiological quality and showed antibacterial properties when they are added to vegetable salad.

• Asian-Australasian Journal of Animal Sciences
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• 제16권1호
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• pp.96-99
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• 2003

The objective of this study was to evaluate the effects of various organic acids on microbial characteristics and Salmonella typhimurium in pork loins. Fresh pork loins were sprayed with various organic acids such as lactic acid, citric acid and acetic acid at various concentrations (0.5, 1, 1.5 and 2%). After spraying, the samples were packaged by HDPE film under air and stored at $4^{\circ}C$ for 14 days, and analyzed. Microbial deterioration of pork loins during the aerobic cold storage was delayed by organic acid spray. The bactericidal effect of acids increased with the increasing concentration. However, the inhibitory activity of organic acids during the storage varied with the kinds and concentrations of the acids. As for total plate counts, acetic acid was found to have the highest bactericidal activity, whereas citric acid was found to be the most inhibitory for coliform and S. typhimurium.

• 한국축산식품학회지
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• 제36권5호
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• pp.617-625
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• 2016

Pastırma, a dry-cured meat product, is produced from the whole muscle and/or muscles obtained from certain parts of beef and water buffalo carcasses. The purpose of this study was to determine the effects of different levels of sodium nitrite on changes in the physicochemical and microbial quality during the production of pastırma. The changes in residual nitrite, salt, pH, moisture, thiobarbutiric acid reactive substances (TBARS), colour (L*, a*, b*), total aerobic mesophilic bacteria (TAMB), lactic acid bacteria (LAB), Micrococcus/Staphylococcus (M/S), mould-yeast (M-Y), and Enterobacteriaceae counts of pastırma with 0, 50, 100 and 150 ppm sodium nitrite were determined during the production. The nitrite levels and the production stages had significant effects (p<0.01) on residual nitrite, TBARS, pH, salt, and colour values. The TBARS values of the pastırma with nitrite were significantly lower (p<0.05) than the control. The final TAMB, LAB, M/S, and M-Y counts of pastırma with 150 ppm nitrite were significantly (p<0.05) lower than the control. Also, the a* (relative redness) values of control pastırma were significantly lower (p<0.05) than the pastırma with nitrite. The production stages had a significant effect (p<0.01) on the moisture.

• 한국식품과학회지
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• 제22권4호
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• pp.492-495
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• 1990

소금용액(15%, w/v)에서 깍두기용 무우 cube를 간절임하는 동안 무우 cube중의 ${\alpha}-amylase$ 활성도와 ascorbic acid 함량의 변화, 포도당액과 고추즙액의 침투에 대한 영향 및 생균수에 미치는 영향을 조사하였다. Ascorbic acid 함량은 1시간 동안 약 24%(w/v)가 감소되었고, 반면 ${\alpha}-amylase$ 활성도는 시간이 경과됨에 따라 다소 증가하는 경향을 보였다. 또한 간절임은 무우 cube 조직내로의 glucose와 고추 중액과 같은 양념류의 침투를 촉진하는 효과가 있었다. 그리고 무우 cube 중의 세균과 효모 및 곰팡이 수는 간절임 중 감소되었는데 간절임 1시간 이내에 주로 감소하는 경향을 나타냈다.

• 한국수산과학회지
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• 제47권5호
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• pp.489-494
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• 2014

This study determined the effect of packaging and electron beam irradiation on the quality of dried Undaria pinnatifida. Samples were air or vacuum packaged and irradiated at 7 kGy. The dried Undaria pinnatifida had total viable cells and coliform counts of 5.51 and 4.40 log CFU/g in total, respectively, and counts of 5.56 and 4.19 log CFU/g in surface. These counts were reduced by 2-4 log cycles after irradiation. Irradiation increased the lightness and yellowness of the dried Undaria pinnatifida, but not the redness. In the sensory evaluation, there were no significant differences among samples. Therefore, electron beam irradiation improves the microbial safety and quality of dried Undaria pinnatifida.

• 한국식품위생안전성학회지
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• 제5권1호
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• pp.21-26
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• 1990

양송이의 감마선조사와 저장에 따른 미생물 생육새험에서 일반세균은 조사 직후 조사선량의 증가와 더불어 2~4 log cyles 정도의 격감을 가져왔으며, 저장 중 생육억제효과로 뚜렷하여 2~3kGy 조사구는 $9\;{\pm}\;1^{\circ}C$ 저장에서 비조사구에 비해 2주 이상 일반세균의 생육을 억제시킬 수 있었다. 효모 및 곰팡이의 생육변화는 저장초기 $10^{3}~10^{4}\;CFU/g$ 정도 오염된 것이 비조사구에서는 계속 증식하여 저장 4이경부터 외관상 버섯표면에 청회색의 포자가 형성되고 버섯균사인 솜털곰팡이가 버섯을 덮기 시작하였으나 2~3 kGy 조사구에서 저장 20일까지도 저장초기의 오염도보다 낮은 수치를 나타내었으며 외관상 곰팡이의 포자형성이 없었다. 대장균군은 저장초기 $10^3\;CFU/g$ 정도로 높게 오염되어 있었으나 2kGy 이상 조사로서 완전 사멸되어 식품위생적 측면에서도 감마선조사가 바람직함을 알 수 있었다. 따라서 감마선 조사는 양송이의 미생물상(microflora)에 대한 질적, 양적 변화를 가져옴으로써 버섯의 전반적인 저장성을 향상시켰다.

• 한국식품조리과학회지
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• 제22권5호통권95호
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• pp.636-641
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• 2006

모시잎 첨가량을 달리하여 제조한 절편의 색도 중 L 값은 모시잎 첨가량이 증가할수록 감소한 반면 적색도는 높은 음의 값을 나타내어 저장별로는 2일부터 유의적인 차이를 보였다(p<0.05). 한편 모시잎 첨가량이 증가할수록 황색도가 낮아져 절편의 색이 녹색을 강하게 나타냄을 알 수 있었으며 40${\sim}$60%를 첨가한 모시잎 절편은 별다른 차이를 보이지 않았다. 견고성, 점착성과 씸힘성은 저장기간에 따라 유의적으로 증가하였다. 응집성은 절편의 저장 시간이 경과함에 따라 대체적으로 감소하는 경향을 보였다. 탄력성은 모시잎 첨가량이 증가할수록 탄력성이 높게 나타났으며, 부착성은 모시잎 첨가량이 증가할수록 낮아졌다. 모시잎 첨가 비율이 높을수록 총 미생물수의 증가폭이 작은 것으로 나타나 모시잎이 떡의 저장기간을 연장시키는 것으로 나타났다. 관능적 품질의 경우 색과 향은 60%첨가 시료와 80%첨가 시료가 유의적인 차이를 나타내지 않아 비슷한 것으로 나타났고 다른 첨가군의 경우 유의적인 차이를 보였다. 색은 저장에 의한 유의적인 차이를 보이지 않았다. 부드러운 정도는 모시잎 첨가량이 증가할수록 증가하는 경향이었다. 이상의 결과로 미루어 볼 때 모시잎의 첨가량이 각기 다른 절편을 제조할 경우 경도와 탄력성은 모시잎 첨가량이 증가함에 따라 감소하였으며, 총 미생물수의 증가폭도 낮아 모시잎이 첨가된 절편은 무첨가군에 비해 저장성이 연장된 것으로 나타났다.

• Journal of Microbiology and Biotechnology
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• 제29권10호
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• pp.1580-1590
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• 2019

Capsaicinoids in red pepper powder are known to show anti-bacterial effects; however, their effects during kimchi fermentation are not known. This study aimed to investigate the effects of various concentrations of capsaicinoids on kimchi fermentation. Five sets of kimchi samples were prepared using 0 mg/kg (control), $98.34{\pm}5.34mg/kg$ (mild), $243.47{\pm}3.71mg/kg$ (medium), $428.63{\pm}30.78mg/kg$ (hot), and $1,320.49{\pm}28.27mg/kg$ (extreme) capsaicinoid. The characteristics of each kimchi sample, including pH, acidity, organic acid, sugars, sugar alcohol, capsaicinoid content, and microbial community were periodically investigated during fermentation. Kimchi with red pepper powder shows significantly higher acidity than control kimchi, whereas pH values were the same. Organic acid in kimchi with red pepper powder was higher than in control kimchi, probably caused by higher lactic acid bacteria (LAB) counts in kimchi samples with red pepper powder. Our results show that addition of red pepper powder decreased Leuconostoc spp. counts in the bacterial community. In particular, Lactobacillus sakei and Leuconostoc gelidum counts increased and decreased, respectively, with increasing capsaicinoid content of red pepper powder added to kimchi. Overall, the results of this study indicate that physicochemical properties and LAB such as L. sakei and L. gelidum are influenced by capsaicinoid content. However, further studies are necessary to investigate the effects of the percentage of red pepper powder in kimchi on fermentation to provide practical guidelines for producing standardized kimchi.

• 대한영양사협회학술지
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• 제27권1호
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• pp.45-58
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• 2021

This study evaluated the sanitation management standards for vegetable preparation processes without a cooking stage. The aerobic plate counts (APC), coliform counts, and Escherichia coli of the samples at each production step were analyzed, and microbial growth of the samples stored at different temperatures was measured. The validation was judged in accordance with the microbial criteria stipulated by the British PHLS. After washing and disinfection, the APCs of the two samples decreased to 3~4 log CFU/g in both seasons. Compared to the purchasing stage, the decrease in coliform counts was approximately 0~3 log CFU/g in both seasons; E. coli was not detected. The initial APC and coliform levels of two vegetable samples were 4~5 log CFU/g in both seasons, with an increase of 1 log CFU/g taking more than 6 h at 25℃ and 2 h at 35℃. More than 10 h at 25℃ and 6 h at 35℃ were required to increase the E. coli O157:H7 count by 1~2 log CFU/g for two seasoned samples. In conclusion, washing and disinfection effects and changes in microbial growth during room temperature storage were similar in the two vegetables. Despite the low sanitizing effect of the two vegetables, when cut vegetables were stored under the critical limit within 2 h at two different room temperatures, seasoned lettuce and chicory were at the 'satisfactory' or 'acceptable' levels of PHLS regardless of the storage temperatures. The validation of sanitation management standards applied to vegetable preparation with the no-cook step was approved.