• 제목/요약/키워드: Dimethylsulphoxide

검색결과 14건 처리시간 0.026초

HepG2 세포에서 용매에 의한 차별적인 사람 싸이토크롬 P450 2E1활성 변화 (Differential Role of Solvents on Human Cytochrome P450 2El Activity in Intact HepG2 Cells)

  • 최달웅
    • 한국환경보건학회지
    • /
    • 제29권3호
    • /
    • pp.9-15
    • /
    • 2003
  • The modification of CYP2El activity is a matter of considerable interest because of its role in the metabolic activation of a variety of environmental toxicants. In the present study, the time-course of changes in human CYP2El activities was determined following treatment with solvents (acetone, dimethylsulphoxide or pyridine) using intact HepG2 cells transfected by human CYP2El. Hydroxylation of chlorzoxazone was used for the measurement of CYP2El activity. CYP2E1 protein level was increased upon cultivation of cells in the presence of the solvents for 24 hr. Determination of CYP2El activities after 24 ht cultivation with the solvents demonstrated that acetone or dimethylsulphoxide increased, whereas pyridine inhibited the activities. This differential effect of the solvents on CYP2El activities persisted to subsequent 24 ht. Competitive inhibition study suggested that pyridine has stronger binding affinity to CYP2E1 than acetone or dimethylsulphoxide. These results demonstrate that different binding affinity of the solvents to CYP2El plays important role in determining real CYP2El activity in intact cells after exposure to the solvents. Present study would be helpful in precise understanding of human CYP2El-mediated toxicity.

시간분해기법을 이용한 디메틸 술폭사이드와 디메틸 포름아미드-아닐린용액에서 온도의존 유전이완에 관한 연구 (Tempereture Dependent Dielectric Relaxation Study of Aniline in Dimethylsulphoxide and Dimethlformamide Using Time Domain Technique)

  • Chaudhari, Ajay;Patil, C.S.;Shankarwar, A.G.; Arbad, B.R.;Mehrotra, S.C.
    • 대한화학회지
    • /
    • 제45권3호
    • /
    • pp.201-207
    • /
    • 2001
  • aniline-dimethylsulphoxide(DMSO)와 aniline-dimethylformamide(DMF) 계에서 dielectric relaxation 에 관한 연구를 10MHz-10GHz 진동수 영역에서 여러 가지 다른 온도 그리고 농도에서 Time Domain Reflectometry(TDR) 방법을 이용하여 수행하였다. dielectric parameter를 정적유전율, 이완시간, Kirkwood 상관계수, 잉여유전율, 잉여 역이완시간, 그리고 열역학 parameter들의 함수로 얻었다. 검정방법으로 최소자승법을 이용하였다. dielectric parameter 들이 온도와 농도에 대해 체계적으로 변하는 것을 볼 수 있었다.

  • PDF

Static Dielectric Constant and Relaxation Time for the Binary Mixture of Water, Ethanol, N. N-Dimethylformamide, Dimethylsulphoxide, and N, M-Dimethylacetamide with 20Hethoxyethanol

  • Ajay Chaudgari;N. M. More;S. C. Mehrotra
    • Bulletin of the Korean Chemical Society
    • /
    • 제22권4호
    • /
    • pp.357-361
    • /
    • 2001
  • Frequency spectra of the complex permittivity of 2-methoxyethanol (2-ME) with water, ethanol, dimethylsulphoxide (DMSO), N,N-dimethylformamide (DMF) and N,N-dimethylacatamide (DMA) have been determined over the frequency range of 10 MHz to 20 GHz at 25 $^{\circ}C$, using the Time domain reflectometry method, for 11 concentrations for each system. The static dielectric constant, dielectric constant at microwave frequency, relaxation time, excess dielectric parameters, and Kirkwood correlation factor have been determined. The relaxation in these systems within the frequency range can be described by a single relaxation time constant, using the Debye model. The parameters show a systematic change with the concentration.

Microwave Dielectric Characterization of Binary Mixtures of 3-Nitrotoluene with Dimethylacetamide, Dimethylformamide and Dimethylsulphoxide

  • Chaudhari, Ajay;Chaudhari, H.C.;Mehrotra, S.C.
    • Bulletin of the Korean Chemical Society
    • /
    • 제25권9호
    • /
    • pp.1403-1407
    • /
    • 2004
  • Dielectric relaxation measurements on 3-nitrotoluene (3-NT) mixture of dimethylacetamide (DMA), dimethylformamide (DMF) and dimethysulphoxide (DMSO) have been carried out across the entire concentration range using Time domain reflectometry technique at 15, 25, 35 and $45^{\circ}C$ over the frequency range from 10 MHz to 20 GHz. For all the mixtures, only one dielectric loss peak was observed in this frequency range and the relaxation in these mixtures can be well described by a single relaxation time using Debye model. Bilinear calibration method is used to obtain complex permittivity ${\varepsilon}^{*}({\omega})$ from complex reflection coefficient ${\rho}^{*}({\omega})$ over frequency range 10 MHz to 20 GHz. The excess permittivity, excess inverse relaxation time, Kirkwood correlation factor, molar energy of activation are also calculated for these mixtures to study the solute-solvent interaction.

수종의 유기용제가 사람 정자의 점액 침투능, 운동성과 생존율에 미치는 영향 (Effects of Organic Solvents on Mucus Penetration Distance, Motility and Survival Rate of Human Sperm in vitro)

  • 유동철;최달웅
    • Environmental Analysis Health and Toxicology
    • /
    • 제19권2호
    • /
    • pp.177-182
    • /
    • 2004
  • Alcohol consumption and exposure to endocrine disruptors and industrial solvents have been implicated in impaired spermatogenesis, increase in the incidence of malformed sperm and decrease in the percentage of moving sperm. The aim of this study was to determine and compare the direct effects of some organic solvents(bisphenol A; BPA, dibutyl phthalate; DBP, formaldehyde; HCHO, dimethylsulphoxide; DMSO, ethanol) on mucus penetration distance, motility and survival rate of human sperm in vitro. Semen samples from 3 health subjects were prepared using swim-up method and 0.0005-0.5% organic solvents were added to the test medium. BPA, DBP, HCHO and DMSO produced significant decreases in the motility and survival rate with a different potency. The most potent inhibition of mucus penetration distance, motility and survival rate was observed after exposure to HCHO. A concentration of 0.0005% HCHO significantly inhibited sperm motility. When ethanol m.: added directly to sperm, at concentrations equivalent to that in serum after heavy drinking, these damaging effects were lowest compared with other solvents. Present study shows that each compound has different toxic potency to human sperm and we need special caution for the use of HCHO.

Study of the Electrochemical Redox Characteristics of Some Triazolopyrimidines

  • Maghraby, A.A. El;Elenien, G.M. Abou;Shehata, K.I.
    • 전기화학회지
    • /
    • 제10권3호
    • /
    • pp.159-168
    • /
    • 2007
  • An electrochemical study related to the redox characteristics of Ethyl-3-acetyl-6-methyl-1, 4-diphenyl-4, 3a-dihydro-1, 3, 4-triazolino[3, 4-a] pyrimidine-5-carboxylate ester and its derivatives (1a-f) and (2a-e) in nonaqueous solvents such as 1, 2-dichloroethane (DCE), dichloromethane (DCM), acetonitrile (AN), dimethylsulphoxide (DMSO) and tetrahydrofurane (THF) using $0.1\;mol\;dm^{-3}$ tetrabutylammonium perchlorate (TBAP) as a supporting electrolyte at platinum, glassy carbon and gold electrodes, has been performed using cyclic voltammetry (CV). Controlled potential electrolysis (CPE) is also carried out to elucidate the course of different electrochemical reactions through the separation and identification of the intermediates and final electrolysis products. The redox mechanism is suggested and proved. It was found that all the investigated compounds in all solvents are oxidized in a single irreversible one electron donating process following the well known pattern of the EC-mechanism to give a dimer. On the other hand, these compounds are reduced in a single irreversible one electron step to form the anion radical, which is basic enough to proton from the media forming the radical which undergoes tautomerization and then dimerization processes to give also another bis-compound through N-N linkage formation.

양태, Platycephalus indicus의 정자의 냉동보존 (Practical Procedure of Sperm Cryopreservation of the Bar-tailed Flathead Platycephalus indicus)

  • 김도형;공일근;라성주;윤지원;한경호;고강희
    • 한국어류학회지
    • /
    • 제23권1호
    • /
    • pp.75-79
    • /
    • 2011
  • 양태, Platycephalus indicus 정자의 동결보존을 위해 적정 동해방지제와 동결높이에 따른 예비동결(0, 2, 4, 6cm), 그리고 해동온도에 따른 정자의 운동성과 생존율로 비교하였다. 적정 동해방지제로 dimethylsulphoxide(DMSO), glycerol, methanol에 대해 실험하였으며, DMSO와 glycerol에서 methanol에 비하여 높은 생존율과 운동성을 나타내었다. 또한, 동결보존에 있어 예비동결은 액체질소표면으로부터 2 cm 높이에서 높은 생존율과 운동성을 보였고, 해동온도로는 $20^{\circ}C$가 가장 적합하였다.

HPLC에 의한 Phaffia rhodozyma 중의 Astaxanthin의 측정법 (Liquid Chromatographic Determination of Astaxanthin in Phaffia rhodozyma)

  • Xu, Bao-Jun;Fang, Zhe-Ming;Kang, Hyo-Jin;Wang, Qi-Jun;Mo, Eun-Kyoung;Sung, Chang-Keun
    • 한국식품영양학회지
    • /
    • 제16권3호
    • /
    • pp.165-170
    • /
    • 2003
  • Astaxanthin은 수산양식에 필수적인 carotenoid 첨가물일 뿐 아니라 우수한 항암 및 항산화 물질로서 알려져 있다. 현재 astaxanthin은 P. rhodozyma에 의해 생산 할 수 있으나 P. rhodozyma에 함유된 유효성분인 astafanthin의 정량적인 분석 방법이 제시되지 못하였다. 본 연구에서는 astaxanthin에 대한 정확한 정성법과 정량분석법을 제안하였다. 이 방법은HPLC의 역상컬럼을 사용하여 dichlorornethane및 4개의 혼합 용매를 이동상으로 사용하는 것이다. 이 제시된 방법을 활용했을 때 P. rhodozyma 배양액 중의 astaxanthin의 함유량을 정확하게 검출할 수 있다. DMSO 와 acetone의 혼합용매가 최적의 astaxanthin 추출용매이었고 또한 낮은 온도와 어두운 환경 이 최적의 시료처리조건이었다.

생쥐 배아의 유리화 동결에 동결액의 조성과 냉각속도의 영향 (Effect on Survival and Developmental Competence of Vitrified Mouse Embryos Using Various Cryoprotectants and Cooling Speeds)

  • 박재균;고영은;엄진희;원형재;이우식;윤태기;이동률
    • Clinical and Experimental Reproductive Medicine
    • /
    • 제37권4호
    • /
    • pp.307-319
    • /
    • 2010
  • 목적: 유리화 동결액의 조성조절과 냉각속도 증진을 통한 동결보호제의 농도를 낮추는 전략을 통해 세포에 미치는 독성을 감소시켜 유리화 동결 및 융해 후 생쥐 배아의 생존율 및 발생률을 증진시키고, 궁극적으로 배아의 유리화 동결법을 개선하고자 하였다. 연구방법: 생쥐 배아와 포배기를 그리드를 이용한 유리화 동결법을 이용하여 동결/융해하였다. 동결액 내 ethylene glycol와 dimethylsulphoxide (DMSO)의 농도와 당의 농도를 조절하여 생쥐 배아의 융해 후 생존율과 발생률을 관찰하였고, 냉각속도의 증가와 동결억제제의 농도와의 상관관계를 포배기의 융해 후 생존율과 발생률에 따라 비교하였다. 또한 융해 후 배아를 대리모에 이식하여 산자를 생산함으로 냉각속도의 효율성을 알아보았다. 결과: EG를 단독으로 사용한 동결보존액 보다는 DMSO와 혼합된 동결보존액의 사용이 보다 유리하다는 결과를 얻을 수 있었다. 슬러시 질소에 의한 냉각속도의 증가가 동결보존의 대상의 상해를 줄여 유리화 동결의 효율성을 증진시키는 것으로 생각된다. 결론: 혼합된 동결보호제를 사용하였을 때 생쥐 배아의 유리화 동결 후 생존과 발생률이 증진되었다. 슬러시 질소를 이용한 유리화 동결의 도입은 냉각속도의 증가를 통해 기존 유리화 동결방법의 효율을 증진시켜 생존율과 융해후 발생률, 임신율 증진에 기여하였다. 또한 냉각속도의 증진은 유리화 동결의 필수요건인 고농도의 동결억제제에 대한 노출을 감소시킬 수 있었다. 이러한 노력은 생식력의 보전을 위한 유리화 동결법의 효율 향상에 기여할 것이다.