• 한국식품저장유통학회지
• /
• 제15권5호
• /
• pp.769-773
• /
• 2008

삼계용 닭에 이산화염소수를 농도별로 처리하여 미생물에 대한 살균효과 및 품질에 관련된 이화학적 특성 변화를 연구하였다. 삼계용 닭의 냉장저장 초기 총 호기성 세균은 대조구 4.14 log CFU/g이었고, 50 ppm 처리 시 0.41 log cycle, 100 ppm 처리 시 0.73 log cycle 감소함을 나타냈으며, 이산화염소수 처리 농도 증가에 비례하여 감소하였다. 저장 10일째 총 호기성 세균수는 이산화염소수 100 ppm 처리시 3.41 log CFU/g에서 6.07 log CFU/g으로 증가한 반면, 대조구는 4.14 log CFU/g에서 6.92 log CFU/g으로 증가하여 저장 기간 동안 대조구와 처리구간의 유의적인 차이를 보였다. pH 와 VBN 값은 저장기간이 증가할수록 증가하였고 처리구와 대조구 간에 유의차를 보이지는 않았다. 관능검사 결과는 삼계용 닭이 저장 7일 이후에는 부패가 진행됨을 보였고, 이산화염소수 처리 농도가 증가할수록 평가점수가 높음을 확인하였다. 따라서, 이산화염소수 처리가 삼계용 닭의 미생물학적 안전성 증진과 저장성 증대에 도움을 준다고 판단된다.

• 한국식품과학회지
• /
• 제51권4호
• /
• pp.404-409
• /
• 2019

본 연구는 염산(hydrochloric acid; HCl)과 아염소산나트륨(sodium chlorite; $NaClO_2$)을 이용해 이산화염소 기체를 발생시키기 위한 최적조건을 확립하기 위해 수행되었다. 먼저 HCl (1 N)에 다양한 농도의 $NaClO_2$ ($50,000-500,000{\mu}g/mL$)를 반응시킨 결과, $100,000{\mu}g/mL$ 농도의 $NaClO_2$를 포함하는 이산화염소 용액으로부터 가장 고농도(695 mg/L)의 이산화염소 기체가 생성되었다. 이후 진행되는 실험은 이산화염소 용액(1 N HCl+$100,000{\mu}g/mL$ $NaClO_2$)을 사용하여 이산화염소 기체를 발생시켰다. 다음으로 상대습도(43, 85, 100%) 또는 온도(4, 12, $25^{\circ}C$)가 이산화염소 기체의 발생에 미치는 영향을 확인한 결과, 상대습도가 감소함에 따라 온도는 높아짐에 따라 이산화염소 기체 발생 농도도 높아짐을 확인하였다. 마지막으로 이산화염소 용액의 용량과 이산화염소 기체 생성량 사이의 관계식을 도출하였다. 본 연구의 결과는 향후 이산화염소 기체를 이용하여 식품 및 식품 접촉 표면을 살균하기 위한 프로그램을 개발하는데 있어서 유용한 정보를 제공할 것이다.

• 한국식품영양과학회지
• /
• 제37권10호
• /
• pp.1337-1342
• /
• 2008

이산화염소는 식품과 식품가공을 위한 시설 및 설비 등을 살균소독 하는데 상업적 염소소독제보다 효과적이므로 새로운 살균소독처리 방법으로 이용 가능성이 높다. 이에 본 연구에서는 양배추에 오염된 병원성 미생물(E. coli O157:H7, L. monocytogenes, S. Typhimurium)을 감소시키기 위해 액체형태의 상업적 염소소독제와 이산화염소를 농도와 시간을 달리하여 처리하였고, 살균소독을 실시했을 때 형성될 수 있는 화학적 손상세포에 대해서도 조사하였다. 그 결과 상업적 염소소독제보다 이산화염소에서 세 가지의 병원성미생물을 유의적으로 감소시켰으며, 특히 200 ppm 이산화염소로 10분 동안 처리했을 때 E. coli O157:H7, L. monocytogenes, S. Typhimurium에 대해 각각 1.98, 1.91, 1.92 log 감소수준을 나타내 모든 처리 구간 중에서 가장 높은 살균소독력을 나타냈다. 또한 세 가지 병원성 미생물 모두 처리시간보다 처리농도의 차이에서 유의적인 차이가 관찰되었다. 세 가지 병원성 미생물에 대하여 상업적 염소소독제와 이산화염소는 화학적 손상세포를 형성하지 않았다. 이에 현재 사용되고 있는 상업적 염소계소독제 처리방법에 비하여 이산화염소를 사용할 것을 권장하며, 이산화염소 응용 시에 처리시간보다 처리농도를 높이는 방법이 병원성 미생물을 저해하는데 더욱 효과적일 것으로 보인다. 그러나 이산화염소가 병원성 미생물에 대한 저해효과는 미생물 및 오염된 원재료의 종류에 따라서 그 결과가 달라질 수 있으므로 보다 다양한 실험이 지속적으로 이루어져야 할 것으로 사료된다.

• 펄프종이기술
• /
• 제33권3호
• /
• pp.84-99
• /
• 2001

This study was carried out to acquire basic data necessary for the use of rice-straw chemical pulp. It investigated the proper bleaching conditions when rice-straw chemical pulp(alkaline sulfite-${Na_2}{S_2}{O_4}$) was bleached using the various kinds of bleaching agents by the two-stages bleaching methods. And, physical properties of pulps bleached with eight kinds of two-stages bleaching methods were tested. The results of this study were as follow; 1. The first-stage bleaching was conducted under the proper conditions with chlorine(C). And then, the proper conditions related to the calcium chlorite(H), hydrogen peroxide(P) and sodium hydrosulfite(Y) bleaching as the second-stage bleaching were investigated. The proper conditions of CH stage were determined to be 0.3% concentration of calcium chlorite, $30^{\circ}C$ of reaction temperature and 20min. of reaction time. For CP stage, the proper conditions of concentration of hydrogen peroxide, reaction temperature and reaction time were 1.5%, $60^{\circ}C$ and 90min., respectively. And for CY stage, the proper conditions were 0.5% concentration of sodium hydrosulfite, $40^{\circ}C$ of reaction temperature and 90min. of reaction time. 2. The first-stage bleaching was conducted under the proper conditions with chlorine dioxide(D). And then, the proper conditions related to the calcium chlorite(H), hydrogen peroxide(P) and sodium hydrosulfite(Y) bleaching as the second-stage bleaching were investigated. The proper conditions of DH stage were determined to be 0.5% concentration of calcium chlorite, $25^{\circ}C$ of reaction temperature and 5min. of reaction time. For DP stage, the proper conditions of concentration of hydrogen peroxide, reaction temperature and reaction time were 1.0%, $70^{\circ}C$ and 90min., respectively. And for DY stage, the proper conditions were 0.3% concentration of sodium hydrosulfite, $50^{\circ}C$ of reaction temperature and 20min. of reaction time. 3. The first-stage bleaching was conducted under the proper conditions with calcium chlorite(H). kAnd then, the proper conditions related to the hydrogen peroxide(P) and sodium hydrosulfite(Y) bleaching as the second-stage bleaching were investigated. The proper conditions of HP stage were determined to be 0.3% concentration of hydrogen peroxide, $30^{\circ}C$ of reaction temperature and 60min. of reaction time. For HY stage, the proper conditions of concentration of sodium hydrosulfite, reaction temperature and reaction time were 2.5%, $60^{\circ}C$ and 30min., respectively. 4. When the rice-straw chemical pulps were bleached with eight kinds of two-stages bleaching methods in the proper conditions mentioned above, respectively, the final brightnesses after CH, CP, CY, DH, DP, DY, HP, and HY bleachings were 62.0, 74.3, 61.4, 58.9, 66.9, 62.9, 50.4 and 60.1, respectively. And strengthes of pulps bleached with DP and DH methods were comparatively higher than those of pulps bleached with other bleaching methods.

• 한국환경과학회지
• /
• 제11권5호
• /
• pp.445-454
• /
• 2002

Material exposure experiments were performed to evaluate the relationship between air pollution and material corrosion rates based on collaboration with researchers in China, Japan, and Korea. Qualitative and quantitative atmospheric corrosion was estimated from damage caused to bronze, copper, steel, marble, cedar, cypress, and lacquer plates exposed to outdoor and indoor conditions in certain East Asian cities. The effects of atmospheric and meteorological factors on the damage to the copper plates and marble pieces were estimated using a regression analysis. The results indicated that sulfur dioxide produced the most destruction of the materials, especially in South Korea and China. In Japan, the copper plates were damaged as a result of natural conditions and sea salt. Copper was also found to be damaged by the surface deposition of sulfur and chlorine. Meanwhile, marble was substantially degraded by gaseous sulfur dioxide, yet sulfate ions in rain had no effect. Accordingly, the analysis of air pollution from the perspective of material damage was determined to be very useful in evaluating and substantiating the intensity of air pollution in East Asia.

• 한국펄프종이공학회:학술대회논문집
• /
• 한국펄프종이공학회 2002년도 추계학술발표논문집
• /
• pp.91-100
• /
• 2002

• 한국식품저장유통학회:학술대회논문집
• /
• 한국식품저장유통학회 2007년도 학술발표회
• /
• pp.213.2-213.2
• /
• 2007

• 한국작물학회:학술대회논문집
• /
• 한국작물학회 2018년도 춘계학술대회
• /
• pp.123-123
• /
• 2018

• Food Science and Biotechnology
• /
• 제17권5호
• /
• pp.971-975
• /
• 2008

This study was to examine the potential disinfection efficiencies of 10 compounds by determining their antimicrobial capacity and ichthyotoxicity. Antimicrobial effects against Vibrio sp., Edwadsiella tarda, Streptococcus sp., and Staphylococcus sp. were tested using 10 different disinfectants; hydrogen peroxide, sodium hypochlorite, chlorine dioxide, povidon iodine, formaldehyde, glutaraldehyde, quaternary ammonium compounds (QACs), didecyl dimethyl ammonium chloride (DDAC), ortho-dichlorobenzen, and copper sulfate. Chlorine dioxide ($ClO_2$) containing 5% $ClO_2$ and copper sulfate had no effects on bactericidal activity, while the other disinfectants resulted in 99.99% bactericidal activity against 4 strains of fish pathogenic bacteria. The ichthyotoxicity of the 10 disinfectants was investigated using 3 kinds of fish species; flounder (Paralichthys olivaceus), rockfish (Sebastes pachycephalus), and black sea bream (Acanthopagrus schlegelii). Median lethal concentration ($LC_{50}$) values of the 10 disinfectants were estimated to determine toxicity ranges of the doses within 24 hr. Among test disinfectant solutions, hydrogen peroxide showed the highest $LC_50$ in flounder (201.3), rockfish (269.7), and black sea bream (139.3 ppm). DDAC revealed the lowest $LC_{50}$ in flounder (2.1), rockfish (1.0), and black sea bream (1.5 ppm). These results suggest that DDAC, quaternary ammonium compounds, glutaraldehyde, and sodium hypochlorite are effective disinfectants for fish and bacterial species examined in this study.

• Journal of Microbiology and Biotechnology
• /
• 제27권2호
• /
• pp.219-225
• /
• 2017

An aqueous chlorine dioxide ($ClO_2$) treatment combined with highly activated calcium oxide (CaO) and mild heat was tested for inactivating naturally existing bacteria and Escherichia coli O157:H7 inoculated on fresh-cut kale. Kale samples were treated with different concentrations of $ClO_2$ (10, 30, and 50 ppm), CaO (0.01%, 0.05%, 0.1%, and 0.2%), and mild heat ($25^{\circ}C$, $45^{\circ}C$, $55^{\circ}C$, and $65^{\circ}C$) as well with combinations of 30 or 50 ppm $ClO_2$ and 0.2% CaO at $55^{\circ}C$ for 3 min. An increasing concentration of $ClO_2$ and CaO significantly reduced the microbial population compared with the control. In addition, mild heating at $55^{\circ}C$ elicited greater microbial reduction than the other temperatures. A combined treatment of 50 ppm $ClO_2$ and 0.2% CaO at $55^{\circ}C$ reduced the population of naturally existing bacteria on kale by 3.10 log colony forming units (CFU)/g, and the counts of E. coli O157:H7 were below the detection limit (1 log CFU/g). In addition, no significant differences in the Hunter color values were evident in any treatment during storage. Therefore, a combined treatment of $ClO_2$ and active CaO at $55^{\circ}C$ can be an effective sanitizing method to improve the microbiological safety of fresh-cut kale without affecting its quality.