• 제목/요약/키워드: Organic compound

검색결과 1,081건 처리시간 0.039초

광변색성 및 전기변색성 색소의 합성 및 특성(I) -광변색성 특성의 섬유소재에의 응용- (Synthesis of the photochromic and electrochromic dyes and their sensible properties (I) - Dyeing application with photochromic moiety to the fiber substrate-)

  • 손영아;박영민;김병순;김성훈
    • 한국염색가공학회지
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    • 제18권2호
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    • pp.24-30
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    • 2006
  • The photosensitive spiroxazine compound and the electrosensitive viologen compound were prepared to examine their practical application feasibilities and behaviors. These dyes represent corresponding chromism effects related to their own characteristics of the dye molecules. Thus, the prepared dyes were characterized and their absorption spectra were also investigated. Besides, an interest on direct spiroxazine exhaustion to the polyamide substrates and its photochromic effects within the fiber molecules were determined. The photochromic reaction on the substrates was clearly observed and its reversible decoloration behaviors responded.

Evaluation of Atmospheric Volatile Organic Compound Characteristics in Specific Areas in Korea Using Long-Term Monitoring Data

  • Jo, Wan-Kuen;Chun, Ho-Hwan;Lee, Sang-Ok
    • Environmental Engineering Research
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    • 제17권2호
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    • pp.103-110
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    • 2012
  • This study was performed mainly to examine whether a city with a metal industrial presence presents different characteristics in ambient volatile organic compound (VOC) concentrations compared to residential (RES) and commercial/residential combined (CRC) areas of another city by using long-term monitoring data (from January 2006 to February 2009). For most target VOCs, ambient concentrations in the metal-industrialized city were lower than for the RES and CRC areas. Aromatic compounds were the predominant VOC groups for the metal industry city as well as for other land uses. The ambient concentrations of aromatic VOCs were higher in the winter and spring seasons than in the summer and fall seasons, whereas those of chlorinated VOCs did not show any distinctive variations. In addition, higher concentrations were observed during daytime hours. The correlations between the ambient target compounds were statistically significant, except for the correlation between benzene and ozone.

항생제 대체 천연물질을 위한 아로니아 주정 추출물 개발에 있어 다양한 Leuconostoc mesenteroides 균주를 이용한 발효가 페놀계 화합물 및 항산화활성 변화에 미치는 영향 (Alteration in Phenolic Compounds and Antioxidant Activities of Aronia melanocarpa Ethanol Extracts following Fermentation Using Different Strains of Leuconostoc mesenteroides to Develop Natural Antibiotic Alternative)

  • 황주환;강주희;이기환;이재훈;이상무;김남형;김주영;김은중
    • 한국유기농업학회지
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    • 제22권4호
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    • pp.825-839
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    • 2014
  • Antioxidant activity is important for reducing oxidative stress that causes various metabolic disorders. Metabolic disorders are highly related to loss of productivity in livestock. Therefore, development of effective antioxidant compounds originating from plants is important for organic agriculture. Phenolic compounds in edible plants are regarded as major components relevant to antioxidant activity. The present study investigated the changes in antioxidant activity and phenolic compound profiles of Aronia (Aronia meloncarpa) by fermentation using different strains of Leuconostoc mesenteroides. A total of 5 strains of L. mesenteroides were used as starter cultures and their ${\beta}$-glucosidase activities were measured. A total of 6 experiment runs were prepared, one for control (uninoculated) and the others (inoculated) for treatments. For biological activity, antioxidant and antibacterial activities were measured. For phenolic compound profiling, TLC and HPLC analysis were performed. The strains of KACC12313 and KACC12315 showed greater enzyme activity than others. Treatment with KCCM35046 showed strong and broad antibacterial activity against to Listeria monocytogenes. Treatments with KCCM35046 and KACC12315 showed the highest total polyphenol content. The highest antioxidant activity was found in KACC12315 treatment. No remarkable alteration was found in thin layer chromatography (TLC) analysis. In phenolic compound profiling analysis, KCCM35046 showed notable alteration in compound area ratio compared to others and also showed the highest caffeic acid content. In chlorogenic acid, treatments with KCCM35046 and KACC12315 showed great content than others. Treatment with KACC12315 showed the greatest content of trans-ferulic acid. As a result of relative performance indexing analysis, L. mesenteroides KCCM35046 and KACC12315 were selected as the best strain for the fermentation of Aronia.

아미드 치환체를 갖는 히단토인계 화합물의 합성과 제초활성 연구 (Synthesis and Herbicidal Activities of Hydantoin Derivatives Possessing Amide Subgroup)

  • 고영관;정근회;류재욱;우재춘;구동완;최정섭;김준영;김태준;권오연;정봉진;김대황
    • 농약과학회지
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    • 제10권2호
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    • pp.153-156
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    • 2006
  • 환경친화형 신규 제초제 개발 연구의 일환으로 아미드 치환체를 갗는 히단토인계 Protoporphyrinogen IX oxidase 저해 화합물 5a - 5i들을 합성하였으며, 온실에서 밭조건 경엽처리 제초활성 시험을 실시하였다. 합성된 화합물 중에서 벤질 아미드 치환체를 갖는 화합물들의 제초활성이 우수하였으며 화합물 5h는 대조화합물인 fluthiacet-methyl과의 비교시험 결과 밭조건에서 문제잡초인 바랭이와 자귀풀에 대한 활성이 보다 우수하였다.

양친매성 유기점토를 이용한 중금속과 유기 오염물질 동시제거 기술 (The Application of Dual Function Organoclay on Remediation of Toxic Metals and Organic Compounds in Soil-Water System)

  • 옥용식;임수길;김정규
    • 한국환경농학회지
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    • 제22권3호
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    • pp.177-184
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    • 2003
  • Although clay can sorb significant amounts of inorganic contaminants from soils and wastewater, the hydration of exchangeable cations in clay minerals makes it hydrophilic at the clay mineral surfaces and interlayers. Thus, natural clays are often ineffective in complexing and stabilizing toxic organic contaminants in soils and groundwater environment. But, substituting these hydrated cations with cationic surfactant such as QAC(Quaternary ammonium Compound) can change the natural clay from hydrophilic to hydropobic. Furthermore functionalized organoclay can act as a powerful dual function sorbent for both toxic metals and organic compounds. It also can be used as landfill clay liners, slurry walls, nano-composite materials, petroleum tank farms, waste treatment, and filter systems. To use this modified clay minerals effectively, it is required to understand the fundamental chemistry of organoclay, synthetic procedures, its engineering application, bioavailability of sorbed ion-clay complex, and potential risk of organoclay. In this review, we investigate the use, application and historical background of the organoclay in remediation technology. The state-of-the-art of organoclay research is also discussed. Finally, we suggest some future implications of organoclay in environmental research.

XPS Investigation of A3 Coupling Reaction in Room Temperature Ionic Liquids

  • Kwon, Ji-Hye;Youn, So-Won;Kang, Yong-Cheol
    • Bulletin of the Korean Chemical Society
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    • 제27권11호
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    • pp.1851-1853
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    • 2006
  • We herein report a new analytical application of XPS to the identification of organic molecules in room temperature ionic liquid for the first time. An organic compound, propargylamine (1), produced in 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][$PF_6$]), which is one of the room temperature ionic liquids (RTILs), via $A^3$ coupling reaction, is characterized by means of x-ray photoelectron spectroscopy (XPS) rather than using conventional organic compound analysis techniques. There are four non-equivalent carbons in RTILs and 1 each. The ratios of normalized integrated areas of the deconvoluted binding energy of core electron of carbon (C1s) peaks are well matched to the number of carbons in those compounds. The binding energies of C1s of the featured carbons in 1, C4 (sp carbons in acetylene group) and C5 ($sp^2$ carbons in benzene ring), are assigned 286.2 and 285.4 eV, respectively. These results will be able to provide an important tool and a new strategy for the analysis of organic molecules

안정성 개선을 위한 무기화합물과 사이클로세린 복합 입자 (Inorganic Compound and Cycloserine Composite Particles for Improved Stability)

  • 김동원;김희서;윤홍준;조혁준;진성규
    • 한국분말재료학회지
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    • 제31권2호
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    • pp.126-131
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    • 2024
  • The aim of this study was to improve the chemical stability of cycloserine containing organic and inorganic compounds. Composite particles were manufactured with a 1:1 weight ratio of organic/inorganic compounds and cycloserine. The influence of organic/inorganic compounds on the stability of cycloserine was investigated under accelerated stress conditions at 60℃/75% RH for 24 hours. In addition, the properties of the composite particles were evaluated using differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and the dissolution of the drug was assessed by preparing it as a hard capsule. Among the organic and inorganic compounds investigated, calcium hydroxide most improved the stability of cycloserine under accelerated stress conditions (53.3 ± 2.2% vs 1.7 ± 0.2%). DSC results confirmed the compatibility between calcium hydroxide and the cycloserine, and SEM results confirmed that it was evenly distributed around the cycloserine. Calcium hydroxide also showed more than 90% cycloserine dissolution within 15 minutes. Therefore, the calcium hydroxide and cycloserine composite particles may be candidates for cycloserine oral pharmaceuticals with enhanced drug stability.