• Journal of Photoscience
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• 제6권4호
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• pp.177-181
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• 1999

The photochemical transformation of carbon monoxide in aqueous ammonia solution has been investigated at 25${\pm}$0.1$^{\circ}C$ using 184.9 nm UV light. Amination and carbonylation processes were carried out by irradiating the aqueous ammonia solution saturated with carbon monoxide, and the formation of formamide, urea, hexamethylenetetramine, formaldehyde, glyoxal and hydrazine was observed. The formation of hydrazine was affected by the presence of ammonia, and the formation of carbonyl compounds such as formaldehyde and glyoxal was influenced by the presence of carbon monoxide. The formation of formamide, urea and hexamethylenetetramine was affected by both ammonia and carbon monoxide. The initial quantum yields of the products were determined and probable mechanisms for the photochemical reaction were presented on the basis of product analysis.

• 미생물학회지
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• 제30권4호
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• pp.299-304
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• 1992

An intracellular protease form cells of Pseudomonas carboxydovorans DSM 1227 grown on carbon monoxide was purified 57-fold in six steps to homogeneity with a yield of 4.3% using azocoll as a substrate. The molecular weight of the enzyme was determined to be 150,000. Sodium dodecyl sulfate-gel electrophoresis revealed the purified enzyme to be a dimer with two identical subunits of molecular weight 72,000. The enzyme was stimulated by $Mg^{2+}$ but was inhibited completely by $Cd^{2+}$ $Fe^{2+}$ $Hg^{2+}$, and $^Zn{2+}$ The enzyme activity was also inhibited by EDTA, EGTA, phenylmethylsulfonyl fluoride, and phenyl glyoxal, but was increased by 1-ethyl-3(dimethyl aminopropyl fluoride, and phenyl glyoxal, but was increased by 1-ethyl-3(dimethyl aminopropyl)carbodiimide, iodoacetamide and dithiothereitol. The optimal pH and temperature for the enzyme reaction were found to be 7-8 and 50.deg.C, respectively. Casein and bovine serum albumin were hydrolyzed by the enzyme, but carbon monoxide dehydrogenase was not.

• Fibers and Polymers
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• 제3권2호
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• pp.73-79
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• 2002

Nanoscaled PVA fibers were prepared by electrospinning. This paper described the electrospinning process, the processing conditions fiber morphology, and some potential applications of the PVA nato-fibers. PVA fibers with various diameters (50-250 nm) were obtained by changing solution concentration, voltage and tip to collector distance (TCD). The major factor was the concentration of PVA solution which affected the fiber diameter evidently. Increasing the concentration, the fiber diameter was increased, and the amount of beads was reduced even to 0%. The fibers were found be efficiently crosslinked by glyoxal during the curing process. Phosphoric acid was used as a catalyst activator to reduce strength losses during crosslinking. Scanning electron micrograph (SEM) and differential scanning calorimetric (DSC) techniques were employed to characterize the morphology and crosslinking of PVA fibers. It was fecund that the primary factor which affected the crosslinking density was the content of chemical crosslinking agent.

• Bulletin of the Korean Chemical Society
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• 제20권2호
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• pp.214-216
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• 1999

• 한국의류학회지
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• 제2권1호
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• pp.125-131
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• 1978

This study was intended to clarify (1) the release of free formaldehyde (2) transfer of free formaldehyde to the contacted fabrics during storing, and (3) the removal effect of free formaldehyde by washing from resin finished fabrics. The results of this study were as follow; 1. The decrease rate of free formaldehyde content in fabrics was higher during storing in open air, poly bag, and glass tube in descending order and the content of free formaldehyde in fabrics was decreased in glyoxal resin finished but, increased in Melamine M-3 resin finished when the fabrics was stored in polybag and in glass tube. 2. Increased amount of formaldehyde transfer to contacted fabrics was noted with Melamine M-3 resin finished than that of glyoxal resin finished. Increased amount of formaldehyde transfer as well as more free formaldehyde were noted in cotton fabrics than in polyester/ cotton blend. 3. The effect of removing free formaldehyde from the fabrics was better in case of solid alkaline soap, synthetic alkaline powdered detergents, neutral detergents in descending order. The romoval of free formaldehyde was marked after the 1st washing and almost no increase in free formaldehyde was found after three times of washing. 4. After first washing, the content of formaldehyde in Melamine M-3 resin finished fabrics increased more rapidly than that of glyoxal resin finished fabrics in condition of closed storing.

• 분석과학
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• 제18권6호
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• pp.535-541
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• 2005

본 연구에서는 오존/활성탄 혼합공정에서 부식산의 초기 pH(pH 3~pH 11)와 반응온도 ($0^{\circ}C$, $20^{\circ}C$, $40^{\circ}C$)를 변화시켰을 때 생성되는 알데히드류의 생성을 조사하였으며, 오존/활성탄 혼합공정 외에 활성탄 흡착과 오존 단독공정을 실험하여 공정에 따른 차이를 비교하였다. 오존 주입농도는 0.08g $O_3/g$ DOC, 활성탄 충진율은 16.5 v/v%였으며, 생성되는 알데히드류는 PFBOA법으로 전처리하여 GC/PDECD로 분석하였다. 오존/활성탄 혼합공정에서 생성되는 알데히드류를 분석한 결과, 포름알데히드와 글리옥살만이 검출되었으며, 그 생성량은 오존단독 공정에 비하여 오존/활성탄 혼합공정에서 더 적게 생성되었다. 오존/활성탄 혼합공정에서 부식산의 초기 pH를 변화시켰을 때, pH 11과 pH 7 에서 반응초기에 포름알데히드가 높은 농도(약 400 ppb)로 생성되었으며, 반응이 진행됨에 따라 포름알데히드와 글리옥살 농도는 모두 감소하는 경향을 나타냈다. 반응온도에 따른 실험에서는 온도가 가장 높은 $40^{\circ}C$에서 포름알데히드와 글리옥살이 가장 많이 생성되었으며, 이때 반응초기의 최고 농도는 각각 약 520 ppb, 120 ppb이었다.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 1998년도 가을 학술발표회논문집
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• pp.129-132
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• 1998

지금까지 면직물의 DP가공에 가장 많이 쓰여온 가교제로는 셀룰로오스의 히드록시기와 ether결합을 형성하는 DMDHEU(dimethyloldihydroxyethylene urea) [1] 이나, 인체에 암을 유발시킬 수 있는 포름알데히드를 발생하기 때문에 그 사용이 제한되고 있으며 현재는 셀룰로오스의 히드록시기와 ester형의 가교를 형성하는 polycarboxylic acid와 같이 포름알데히드를 발생하지 않는 가교제에 대한 연구가 활발히 진행되고 있다. (중략)

• 한국미생물학회:학술대회논문집
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• 한국미생물학회 2008년도 International Meeting of the Microbiological Society of Korea
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• pp.162-162
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• 2008

• 한국의류학회지
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• 제11권1호
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• pp.51-62
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• 1987

In this study, electrostatic behavior of polyester and nylon fabric treated with anti-static agents were investigated. The effects of the concentration of the agents and curing conditions on the electrostatic charge of the fabrics were studied. And washfastness, lightfastness and physicalproperties of the treated fabrics were also investigated. The results were as follows: 1) Polyethylene glycol alkylester was more effective in antistatic behavior than polyethylene laurylphosphate, and polyester is more effective in anti-static behavior than nylon. 2) Concentration of anti-static agents were suitable in concentration of $4\%$. 3) Glyoxal resin was more effective in anti-static behavior than melamine resin, and it was also good in the retaing anti-static behavior after treatments of lightfastness and washfastness. 4) As the condition of curing treatment, $190^{\circ}C$, 1min. for glyoxal resin and $130^{\circ}C$, 4min. for melamine resin is appropriate. 5) In comparison of anti-static behavior according to treating conditions, the simultaneous treatment was more effective than any other treatments. 6) Change of electrostatic charge of anti-static nylon cloths after treatments of lightfastness and washfastness increased greatly in above 10 laundering time and 20 fade-O-meter time. 7) In physical properties according to concentration of treating agents. decrease of physical properties scarcely appeared in concentration of treating agents $4\~5\%$.

• 한국수산과학회지
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• 제42권2호
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• pp.104-108
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• 2009

Glycation and oxidation induce formation of carbonyl (CO) groups in proteins, which can be used to develop an index of cellular aging. Methyl glyoxal (MG) and hypochlorite anions are deleterious products of oxygen free-radical reaction. The effects of eel carnosine on protein modification mediated by MG and hypochlorite were studied. MG and hypochlorite induced formation of carbonyl groups with high molecular weight and cross-linked forms of ovalbumin. The presence of eel carnosine effectively inhibited these modifications in a concentration-dependent manner. Imidazole ring in eel carnosine might have a primary role in inhibition of protein glycation. Our data suggests that the eel carnosine may be useful as a "natural" anti-glycating agents.