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AgNo3 침적 처리가 활성탄소섬유의 Ag 에 의한 미세기공 채움 및 항균활성에 미치는 영향
장유신(Yu Sin Jang),박수진(Soo Jin Park) 한국공업화학회 2002 공업화학 Vol.13 No.2
AgNO_3 용액 침적처리로 세균에 대한 항균활성을 가지는 활성탄소섬유를 제조하여 미세기공 채움 및 항균활성에 미치는 영향에 대하여 고찰하였다. 미세기공의 채움 특성은 BET를 이용하여 측정하였으며, 항균활성시험은 병원성 세균으로서 그람 양성균인 황색포도상구균 (Staphylococcus aureus)과 비병원성의 그람 음성균인 대장균 (Escherichia coli)을 대상으로 그 효과를 측정하였다. 그 결과, Ag가 활성탄소섬유 표면에 도입됨에 따라 비표면적은 약간씩 감소하는 경향을 나타내었으며, 기공에 침착되는 Ag는 낮은 농도에서 보다 상대적으로 높은 농도에서 기공의 막힘 현상이나 채움 현상에 더 많은 영향을 미쳤으며, 미세기공 중 상대적으로 큰 미세기공에서 채움 현상이 많이 일어나는 것을 관찰할 수 있었다. 또한, 항균활성 시험으로부터 1.0 wt% AgNO_3 용액으로 처리한 활성탄소섬유는 S. aureus 및 E. coli 모두에서 강한 항균활성을 나타내는 것을 확인하였다. Activated carbon fibers (ACFs), which supported silver, were prepared by immersion processed in AgNO_3 solution, and the effects of micropore filling by silver particles and is antibacterial activity were investigated. Effect of micropore filling by silver particles and antibacterial activity were characterized by BET methods and dilution test against Staplylococcus aureus (S.aureus; gram positive and virulene) and Escherichia coli (E. coli; gram negative and avirulence), respectively. From the experimental results, the ACFs exhibited a decrease in BET`s specific surface area following the treatment with the silver solution. More micropores were either filled or closed by silver particles at a higher concentration of AgNO_3 solution rather than a lower one. The ACFs immersed in 1.0 wt% of AgNO_3 showed a strong antibacterial activity against the both strains, S. aureus and E. coli, which suggests it as a promising antibacterial material.
미생물을 이용한 합성가스로부터 바이오 알코올 생산 최신 동향
우지은 ( Ji Eun Woo ),장유신 ( Yu-sin Jang ) 한국응용생명화학회 2017 Journal of Applied Biological Chemistry (J. Appl. Vol.60 No.4
Cellulosic alcohol fermentation has recently gained more attention in the production of ethanol, butanol, and 2,3-butanediol. However, it was revealed that the process had several hurdles, such as, an expensive cost for biomass decomposition to yield fermentable sugars and a production of byproduct lignin. As an alternative for the process through biomass saccharification, the alcohol production through syngas from biomass has been studied. In this study, we reviewed acetogen and its central metabolic pathway, Wood-Ljungdahl route, capable of utilizing syngas. Furthermore, the metabolic engineering strategies of acetogen for bio-alcohol production from syngas was also reviewed with a brief perspective.
노현지(Hyeon Ji Noh),장유신(Yu-Sin Jang) 한국생물공학회 2017 KSBB Journal Vol.32 No.3
Butyric acid (C4 carboxylic acid) is used as an important compound in food, pharmaceutical, and chemical industries. Currently, butyric acid is mainly produced at the industrial scale through the petrochemical processes. Biobased butyric acid has also gained attention, because the consumer prefers the food and pharmaceutical ingredients that are produced through fermentation. Clostridia is one of the well-known butyric acid producers, and massively engineered for enhanced production of butyric acid. In this paper, we reviewed the metabolic pathway of clostridia, especially Clostridium acetobutylicum and Clostridium tyrobutyricum, and summarized the metabolic engineering strategies of the strains for enhanced production of butyric acid.
공업화학, 촉매/반응공학 : 전해 구리 도금된 활성탄소섬유에 의한 NO의 촉매 환원반응 메커니즘 연구
박수진 ( Soo Jin Park ),장유신 ( Yu Sin Jang ),( Junjiro Kawasaki ) 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.6
In this work, the catalytic reduction mechanisms of NO over ACFs/copper prepared by electrolytic copper plating has been studied. It was found that copper content on carbon surfaces increased with increasing the plating time. However, a slightly gradual decrease of adsorption properties, such as, BET specific surface area, was observed in increasing the plating times within the range of well-developed micropore structures. As experimental results, nitric oxide was converted into the nitrogen and oxygen on ACFs and ACFs/copper catalyst surfaces at 500℃. Especially, the surfaces of ACFs/copper catalyst were found to scavenge the oxygen released by catalytic reduction of NO, which could be explained by the presence of another nitric oxide reduction mechanism between ACFs and ACFs/copper catalysts.