• 조명전기설비학회논문지
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• 제30권2호
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• pp.31-36
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• 2016

For the purpose of indoor air purification, air conditioner or purifier is generally used, but the long operating time induced the contamination by cumulation of bacteria in the air filter. The ozone sterilization method can be one of the effective sterilization method for this case. Ozone has not leave a secondary residual contaminants, as well as a strong sterilization power. In this study, nonthermal plasma technology is investigated as an ozone generator for the air filter sterilization. Additionally, nonthermal plasma technology is possible to obtain the generation of negative ions and electrostatic force by simply adjusting the applied voltage.

• 동의생리병리학회지
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• 제27권4호
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• pp.367-373
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• 2013

The purpose of this study was to analyze the patent application trend in the processing technology for medicinal herbs. Recently, in processing technology for medicinal herbs, experimental researches have frequently been published through papers in journals. However, the research results about the patent area were fewer than the others. We tried to analyze the patent application trend in nonthermal processing technologies for medicinal herbs by country as Korea, Japan, U.S.A. and Europe. The detailed technologies consisted of pulsed electric field, oscillatory magnetic field, intense pulsed light, ultrasonification, high hydrostatic pressure, microwave, radiation, Ohmic heating, and supercritical extraction. As a result we found that patents of nonthermal processing technologies has been growing steadily in quantity from 1980s and growing quickly since 2000s. The number of patent in Korea is larger than others as making up 70% in that whole. The number of patent in ultrasonification field was larger than others in portfolio analysis. Patent application trend in nonthermal processing technologies for ingestion occupies high share compared to other usage applications. In conclusion, patent trends of nonthermal processing technologies for medicinal herbs belong to the period in the development.

• 한국식품과학회지
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• 제51권6호
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• pp.551-557
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• 2019

본 연구는 소비자들의 식품안전과 위생에 대한 요구가 강해짐에 따라 식중독의 위험에 노출되어 있는 분말식품 중 전세계적으로 널리 사용되는 향신료 중 하나인 후춧가루의 비가열 살균 처리 방법에 따른 향미특성 변화를 비교 분석하였다. 색도 측정 결과 색도차(ΔE)는 저온 플라즈마와 자외선 살균처리 후에도 육안에 의한 인식 한계인 1.5 내외로 유지되었고, 광펄스 처리 후에는 6.58로 큰 차이를 보였다. Piperine 함량 정량 결과는 살균 전 후추가 10.7±0.53 mg/g로 가장 많았으며 자외선 살균처리(9.5±0.35 mg/g), 저온 플라즈마 살균처리(9.0±0.15 mg/g), 광펄스 살균처리(4.4±0.17 mg/g) 순으로 광펄스 58.9%, 저온 플라즈마 15.9%, 자외선 11.2%의 감소율을 보였다. 전자코 분석 결과 살균 처리 전후가 제 1주성분에 의해 두 그룹으로 구분되어 명확하게 향의 차이가 나타났으며, 제 1주성분과 제 2주성분에 의해서는 세 개의 그룹으로 나뉘었다. 강도평가 결과 살균처리 전, 광펄스, 저온 플라즈마, 자외선 살균처리 후 순으로 후추 향과 맛이 강하다고 응답했으며, 광펄스와 저온 플라즈마 살균처리 후의 후추는 유의적인 차이를 보이지 않았다. 강도평가 결과와 piperine 함량 정량과는 차이가 있었으며, 전자코 분석 결과와는 유사했다. 정량적 묘사분석(QDA)를 통해 13개의 관능적 언어가 개발되었다. 살균처리 후의 시료가 마른 솔잎향과 떫은맛, 고소한맛을 제외한 모든 항목에서 살균처리 전의 시료보다 관능적 특성이 낮게 나타났다. 이를 통해 살균처리 방법에 따라 후추향과 맛에 영향을 끼쳤음을 알 수 있었다. 또한 piperine 함량을 통해 후추 맛의 강도를 평가하기에는 어려움이 있으며 전자코 분석을 통해서 후추향의 강도를 평가하는데 중요한 자료로 사용될 수 있다고 판단된다.

• 한국생산제조학회지
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• 제22권5호
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• pp.818-823
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• 2013

In the process of sterilization during the manufacture of beverages, both the treatment time and the temperature influence the beverage taste and flavor. Therefore, to improve the beverage quality, a nonthermal sterilization method is preferred to a high-temperature one. A nonthermal method, ultrasonic treatment by shock waves from cavitation, has been known to have a sterilizing effect. In this study, to observe the effect of ultrasonic frequency and treatment time on beverage quality, batch type ultrasonic equipment was fabricated and tested. Further, to evaluate the applicability of this ultrasonic method to an in-situ process, flow type ultrasonic heptagonal equipment was fabricated and then used to perform a sterilization experiment. Subsequently, the sterilizing effect was measured under ultrasonic and low-temperature ($55^{\circ}C$) treatments. Based on the obtained results, ultrasonic sterilization technology that can be applied for treatments at flow rates of up to 3 L/min was developed.

• 한국대기환경학회지
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• 제22권1호
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• pp.43-51
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• 2006

Nonthermal plasma-driven catalysis (PDC) was investigated for the decomposition of benzene and toluene as model compounds of volatile organic compounds (VOCs) at atmospheric pressure and low temperature. Two types of catalysts Ag/$TiO_{2}$ and Pt/$\gamma-Al_{2}O_{3}$ were tested in this study. The amount of catalysts packed in the PDC reactor did not influence on the decomposition efficiency of benzene. The type of catalysts also had no influence on the decomposition efficiency of toluene and carbon balance. The Ag/$TiO_{2}$ catalyst showed constant $CO_{2}$ selectivity of about $73\%$ regardless of the specific input energy. However, the selectivity of $CO_{2}$ was greatly enhanced with the Pt/$\gamma-Al_{2}O_{3}$ catalysts, and reached $97\%$ at 205 J/L. Two test runs with 20 fold difference in the gas flow clearly indicated that lab-scale data can be successfully applied for the scaling-up of PDC system.

• 한국식품과학회지
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• 제43권4호
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• pp.513-517
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• 2011

PS 필름에 접종된 S. Typhimurium, E. coli O157:H7, L. monocytogenes를 저해시킬 때 헬륨을 사용한 플라즈마 처리의 경우에는 S. Typhimurium이, 헬륨과 산소를 동시에 사용한 플라즈마 처리의 경우에는 L. monocytogenes가 가장 많이 저해되었다. E. coli O157:H7과 L. monocytogenes는 헬륨과 산소를 함께 사용하여 플라즈마 처리하였을 때 헬륨만 사용하였을 때보다 더 큰 저해를 보였다. 헬륨과 산소를 함께 사용한 비열 플라즈마 처리는 L. monocytogenes가 소시지 케이싱이나 훈제연어에 감염되었을 때보다 PS 필름에 감염되었을 때 L. monocytogenes를 더 효과적으로 저해시켜 감염된 재료에 따라 다른 저해 효과를 보여 주었다. 비열 플라즈마 처리에 사용된 가스의 종류와 미생물이 감염된 재료는 그 처리의 항균 효과에 대한 평가에서 중요하게 고려되어야 할 것이다. 헬륨과 산소를 사용한 비열 플라즈마 처리는 공정 후 포장재에 감염된 L. monocytogenes를 효과적으로 저해할 수 있을 것으로 기대된다.

• 생명과학회지
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• 제23권6호
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• pp.838-846
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• 2013

플라즈마는 물질의 제4의 상태로서 이온화된 가스로 불리며 다양한 활성종 및 수산화기, 하전입자, 이온, 자유 전자, 산소등을 발생시키는 특징을 가지고 있다. 20세기 후반에 플라즈마는 산업현장에서 활발히 사용되고 있으며, 최근 저온 상압 플라즈마 장치가 개발되면서 의생명 분야에 적용되기 시작했다. 저온 상압 플라즈마는 인체조직에 열 손상을 입히지 않을 뿐만 아니라, 암 치료, 살균, 치아미백, 지혈, 상처치유 등에서 높은 효율성을 보이고 있다. 이때 발생되는 활성종은 포유세포나 병원균에 영향을 미치는 것으로 알려져 있다. 또한, 다학제간의 연구를 통해 저온 상압 플라즈마의 활용범위는 다양한 영역으로 넓어지고 있으며, 새로운 첨단 의료기술로서의 가치가 높아지고 있다. 저온 상압 플라즈마가 포유세포와 미생물에 적용된 이후, 지난 10여 년간 급속한 발전을 통해 최근 플라즈마 메디신이란 학문영역으로 성장했다. 본 논문은 저온 플라즈마가 적용되고 있는 분야에 대해 소개하고, 플라즈마 메디신에 대한 이해를 돕고자 한다.

• 한국식품영양학회지
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• 제25권1호
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• pp.69-76
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• 2012

Intense pulsed light(IPL) has been highlighted as an innovative nonthermal sterilization technology that can kill spoilage or pathogenic microorganisms by using short-duration pulses of intense broad-spectrum electromagnetic radiation. This paper examines the inactivation effects of IPL on Listeria monocytogenes, Escherichia coli O157:H7, and Pseudomonas aeruginosa inoculated on seafood products such as salmon, flatfish, and shrimps and evaluates the possibility of extending the shelf-life of seafood products. The results indicate that the inactivation of microorganisms increased with an increase in IPL energy density($J/cm^2$) and a decrease in the distance between the sample surface and the lamp. In addition, temperature increases on the fish fillets during the treatments were well controlled within the range of 5.7~$9.8^{\circ}C$. The IPL treatment had a significant positive effect on the storage stability of seafood products at the storage temperature of $4^{\circ}C$ for 12 days. These results suggest that the storage period for fish fillets can be extended from 4 days to 6~8 days through the IPL treatment.

• 한국응용과학기술학회지
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• 제31권4호
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• pp.541-548
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• 2014

This study was performed to obtain high conversion efficiency of $C_7H_8$ using non-thermal plasma and metal-supported catalyst. Adsorption-desorption characteristics of toluene was performed using 4A type (Zeolite) filled in a concentration reactor. Through this test, it was found that the concentration reactor has 0.020 g/g of adsorption capacity (at ambient temperature and pressure) and 3,600 ppm of desorption property at $150^{\circ}C$ (with in 20 min). In case of developed catalyst, toluene decomposition rate of Pd-AO (Pd coated catalyst) was better than Pd/Cu-AO and Pd/Ag-AO (Pd/Ag composite metal catalyst). Developed non-thermal plasma system was obtained flame amplification effect using injection process of desorbed tolune, and 98% of removal efficiency.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
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• pp.155.1-155.1
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• 2013

The goals of this study are to elucidate the plasma effects on DNA molecules to apply some plasma based applications and also to find out the mechanisms of plasma-induced DNA damage in biomolecule. Nonthermal atmospheric pressure plasma has much potential for medical, agricultural and food applications for the future. The atmospheric pressure plasma jet (APPJ) contains radicals, charged particles, low energy electrons, excited molecules and UV light. It has been started doing experiments using APPJ at the early 21th. And some recent results showed that APPJ has a possibility to apply to new fields like mentioned above. But it is kind of at the very early stages of plasma based application. It is definitely necessary much of theoretical and experimental studies to further understanding to use nonthermal atmospheric pressure plasma in biomedical, agriculture and food parts. Here we introduce a new experimental system to study plasma effects on biomolecules. And we will show some recent results of LEE-induced DNA damage using electron irradiation apparatus under ultra-high vacuum.