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Glutaraldehyde를 이용한 설파제의 합성과 지속성에 관한 연구
윤철훈,Yoon Cheol Hun 한국환경보건학회 2004 한국환경보건학회지 Vol.30 No.5
Dual actions are the most recently used delivery system in drug study. Dual-action agents are unique chemical entities comprised of two different type of antibacterial compounds covalently linked together in a single molecule in such a way that both components are able to exert their bactericidal properties. Crosslinked sulfadiazine-sulfanilamide such as antibiotics is synthesized by synthetic handle with glutaraldehyde. As a result, New synthetic antibacterial agent exhibited the broad antibacterial activities against Gram(+) and Gram(-) of 4 strains and a long durability supposing that the stomach and blood.
윤철훈 ( Cheol Hun Yoon ) 한국유화학회 2004 한국응용과학기술학회지 Vol.21 No.4
N/A The firing reaction and calcination characteristics of the waste shellfish were examined for the future use as absorbent. The weight variation was measured according to thermal-decomposition using TGA and observed variation of the phase. The qualitative and quantitative analysis of the sample were performed using XRD and the structural analysis, SEM. The results of TGA and XRD experiments showed that the almost all of the raw Corbicula Japonica and Ostrea virgirjca were changed from calcite to lime by firing and calcination reaction. The result of SEM experiment showed that the plate type of the raw sample was changed to circle type, so the surface area ratio was increased. Above results suggested that waste shellfish were usable as absorbent in the viewpoint of the reuse of resource and the decrease of environmental pollution.
Sulfamethazine 에 의한 폴리아크릴산의 항균 효과
윤철훈(Cheol Hun Yoon) 한국유화학회 2001 한국응용과학기술학회지 Vol.18 No.3
N/A Antibiotics polymer prepared by chemical bonding and simple blending of antibacterial into polymers have attracted much interest because of their long-lasting and antibacterial activity. Antibiotics polymer can significantly reduce losses associated with dissolution, photolytic decomposition and volatillization. Further more, increased efficiency safety and selectivity are additional benefits which may be realized. In this study, Antibiotics polymer was synthesized by chemical reaction of polyacrylic acid with sulfamethazine by N,N´-dicyclohexylcarbodiimide(DCC) method. Antibacterial susceptibility was determined against Streptococcus pyrogenes[gram(+)] and Esherichia coli.[gram(-)] using a standardized disc test. As a result, the synthetic antibiotics polymer exhibited the broad susceptibilty against Streptococcus pyrogenes and Esherichia coli. Especially, the antibiotic effect of antibacterial polymer against Gram negative(Esherichia coli) was much stronger than that against Gram positive(Streptococcus pyrogenes).
정덕채,윤철훈,엄미선,황현석,백정훈,최진호,Jung, Duck-Chae,Yoon, Cheol-Hun,Um, Mi-Sun,Hwang, Hyun-Suk,Baek, Jung-Hun,Choi, Jin-Ho 한국환경보건학회 2013 한국환경보건학회지 Vol.39 No.4
Objectives: Phthalates are used in a large variety of products including as coatings of pharmaceutical tablets, film formers, stabilizers, dispersants, emulsifying agents, and suspending agents. They have been the subject of great public concern in recent years. The extensive uses of this material have attracted attention and issues regarding its safety have been raised. Methods: In this study, three types of phthalate skin permeation were studied using matrixes such as ointments, creams and lotions in vitro. The absorption of phthalate diesters [Dimethyl phthalate (DMP), Di-n-propyl phthalate (DPP) and Di-n-pentyl phthalate (DNPP)] using film former has been measured in vitro through rat skin. Epidermal membranes were set up in Franz diffusion cells and their permeability to PBS measured in order to establish the integrity of the skin before the phthalates were applied to the epidermal surface. Results: Absorption rates for each phthalate ester were determined and permeability assessment made to quantify any irreversible alterations in barrier function due to contact with the esters. Types of phthalate in vitro experimental results quickly appeared in the following order DMP > DPP ${\geq}$ DNPP. Conclusions: In the experimental results, lotion> cream> ointment, and the permeation rate of lotion with a great amount of moisture was the fastest. Skin permeation rate is generally influenced by the chemical characteristics of a given chemical, such as molecular weight and lipophilicity. As the esters became more lipophilic and less hydrophilic, the rate of absorption decreased.
1,1,1-TCE , CFC-113 대체세정제를 이용한 스크린인쇄 세정연구
이기창,윤철훈,황성규,오세영,이석우,류정욱 ( Ki Chang Lee,Cheol Hun Yoon,Sung Kwy Hwang,Se young Oh,Seok Woo Lee,Jung Wok Ryu ) 한국유화학회 1997 한국응용과학기술학회지 Vol.14 No.2
The field of printing use to pressurization ink using screen gassamer that is called screen printing. Existing cleaning solvent using screen printing are he organic solvents including aromatic compounds carried with poisonous and stench. Besides, cleaning method of current screen printing are for the most part mixed cleaning method of dipping and polish. Using 1,1,1-TEC, CFC-113 alternative system cleaning solvent be substituted for existing cleaning solvent against screen printing ink measured the cleaning efficiency according to gravimetric analysis method and property change of gassamer according to Image Analyzer. Also, Cleaning process system carry with excellent cleaning efficiency studied which was proposed new cleaning process including ultrasonic and vibration cleaning process be substituted for existing mixed cleaning method of dipping and polish.
정덕채,이기창,윤철훈,김판기,신동환,Jung, Duck-Chae,Lee, Ki-Chang,Yoon, Cheol-Hun,Kim, Pan-Gyi,Shin, Dong-Hwan 한국환경보건학회 1999 한국환경보건학회지 Vol.25 No.3
Biodegradable films were prepared by solution blend method in the weight ratio of chitosan for the purpose of useful biomaterials. The possibility of biomaterials prepared from natural polymer as a skin substitute was evaluated by measuring biocompatibility. These films were inserts in the back of rat and their biodegradability was investigated by the film weight and hematology as a function of time for the biotransformation. The result of rat test showed that medium, high viscosity chitosan induced some suspects of inbiocompatibility in the tissue by goreign body reaction 48 and 72 hours after implantation. Also, we prepared the official burn ointment which is made by low viscosity chitosan. This burn ointment was covered on the skin wound of artificial burn and their effect of healing was investigated by the evaluation of the naked eye and hematological change as a function of time. The result of rats test showed that burn ointments made from chitosan was effective reductio of inflammation than negative group.
Furfurylidene acetophenone 유도체의 합성과 가수분해 반응
이기창,이광일,윤철훈,황성규,오세영 ( Ki Chang Lee,Kwang Il Lee,Cheol Hun Yoon,Sung kwy Hwang,Se Young Oh ) 한국유화학회 1996 한국응용과학기술학회지 Vol.13 No.1
Furfurylidene acetophenone derivatives were synthesis, it was measured that hydrolysis made use of UV at a wide pH 1.0~13.0 range in 30% dioxane-H_2O solution, 25±1℃. On the basis of general base catalysis, substitutent effect, confirmation of hydrolysis products, it was measured the reaction rate of furfurylidene acetophenone derivatives for the pH change. It maybe concluded that a part was unrelated to pH and another part was in proportion to concentration of hyfroxide ion : Above pH 10.0, It was in proportion to concentration of hydroxide ion, a part having no concern with pH was added to the neutral H_2O molecule. From the result of measurement the reaction rate, hydrolysis of furfurylidene acetophenone derivatver confirmed to the irreversible first order. Through measurement the substituent effect, It found that reaction rate was accelerated by electron attracting group. Also, From the result of final product, There were furfural and acetophenone derivative was proposed a fitting mechanism.
2-Fluorenylidene chalcone 유도체에 대한 Thioglycolic acid 의 친핵성 첨가 반응에 관한 연구
이기창,이광일,황용현,류정욱,윤철훈 ( Ki Chang Lee,Kwang Il Lee,Yong Hyun Hwang,Jung Wook Ryu,Cheol Hun Yoon ) 한국유화학회 1996 한국응용과학기술학회지 Vol.13 No.1
Fluorenylidene chalcone derivatives were synthesized by condensation. The structure of these compounds were ascertained by means of UV melting point IR and ^1H-NMR spectra. The nucleophilic addition reaction kinetics of Thioglycolic acid to fluorenylidene chalcone was investigate by UV in 20% dioxane-H_2O at 25℃. The rate equation which were applied over a wide pH1.0~13.0 range. On the basis of general base catalysis and sonfirmation of addition reaction product, the nucleophilic addition reaction kinetics of thioglycolic acid to fluorenylidene chalcone were measured by the pH change. From the result of the above caption, a plausible nucleophilic addition reaction mechanism of thioglycolic acid to fluorenylidene chalcone was proposed. These compounds may be used as the starting materials for the preparation of the engineering plastics or the germicide.
이기창,최성용,배남경,윤철훈,황성규 ( Ki Chang Lee,Sung Yong Choi,Nam Kyoung Bae,Cheol Hun Yoon,Sung Kwy Hwang ) 한국유화학회 1996 한국응용과학기술학회지 Vol.13 No.3
Naphthoquinone-1,2-diazide-5-sulfony[NDAS] derivatives members of quinone diazide compound that are utilizable as photosensitive polymer material were synthesized, and photoresist were prepared by mixing these derivatives with mcresol novolak(a matrix resin) at various weight ratios. Photosensitive characteristics of photoresist were studied by examining UV and IR, relative sensitivity using a Gray scale method, and SEM to analyze if they can be used as photosensitive material in printing process. Experimental results showed that, by UV, NDAS derivatives were photoconverted and developer-soluble photoresist were produced. The mixing ratio of 1:4(by mass) of NDAS+phydroxybenzophenone+sensitizer and mcresol novolak gave rise to the highest dissolution rate. In addition, photoresist obtained at this condition resulted in the most superior sensitivity and contrast.