• Title/Summary/Keyword: UV spectroscopy

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Effect of Analytical Method on the Pharmacokinetic Evaluation of Bromosulfophthalein: Comparison of HPLC and UV Spectroscopy Method (Bromosulfophthalein의 체내동태 평가에 미치는 분석법의 영향: HPLC 법과 UV 흡광광도법의 비교)

  • Oh, Ju-Hee;Cha, You-Kyoung;Lee, Young-Joo
    • Journal of Pharmaceutical Investigation
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    • v.38 no.6
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    • pp.399-403
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    • 2008
  • The aim of this study was to evaluate the difference of analytical methods for the pharmacokinetic study of bromosulfophthalein (BSP), an indicator of hepatobiliary function. The plasma and bile concentrations of BSP after intravenous administration were measured according to custom UV spectroscopy and HPLC, respectively. Plasma concentration of BSP measured by UV spectroscopy was similar to that measured by HPLC. There was no significant difference in the distribution volume, total body clearance, area under the curve and mean residence time of BSP between different analytical method groups. However, bile concentration of BSP measured by UV spectroscopy was overestimated compared with concentration measured by HPLC method. Biliary clearance of BSP obtained from UV spectroscopy method was almost 3 times higher than that obtained from HPLC method. Thus, a feasibility of UV spectroscopy method for high throughput pharmacokinetic evaluation of BSP was limited to the study based on the plasma concentration of BSP, not bile concentration.

Application of UV-Vis Spectroscopic Analysis for Transformer Insulating Paper Degradation (UV-Vis 분광분석에 의한 전기변압기 내 절연지 열화도 측정)

  • Kong, Hosung;Han, Hung-Gu
    • Tribology and Lubricants
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    • v.35 no.3
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    • pp.151-157
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    • 2019
  • Insulated oil degradation produces charged by-products, such as acids and hydro-peroxides, which tend to reduce the insulating properties of the oil. In this study, UV-vis spectroscopy measurement technology is developed and experimentally compared with other measurement methods, such as the titration method and IR spectroscopy, to validate its ability to monitor the degradation of electrical insulating paper. The degradation characteristics of the insulating paper are appropriately represented through various types of measurement methods, such as the Tan (delta) method, $CO_2$ gas production measurement, the titration method, and IR spectroscopy. The results are demonstrated to be well comparable to a change in the fluorescence emission ratio (FER), which is defined as the shift in fluorescence intensity in the measured wavelength range, and also to the chromatic ratio, which is defined as a color shift to longer wavelength ranges. The results also show that, by using UV-vis spectroscopy, it is possible to detect the degradation of the insulating paper. This study suggests that UV-vis spectroscopy can be applied as an alternative to high-performance liquid chromatography, which is the internationally recognized measurement technology for cellulose paper degradation. The FER detector is also verified to be useful as an effective condition-monitoring device for power transformers.

Monitoring Oxidation Behavior of [C70]Fullerene by Ultrasonic Spectroscopy ([C70]풀러렌 산화 반응의 거동에 관한 초음파 분광학적 고찰)

  • Ko, Weon Bae
    • Elastomers and Composites
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    • v.49 no.2
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    • pp.155-159
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    • 2014
  • High resolution ultrasonic spectroscopy was used to observe the oxidation of [$C_{70}$]fullerene with 3-chloroperoxy benzoic acid in 1,2-dichlorobenzene. UV-vis spectroscopy and X-ray diffraction confirmed the resulting roducts of [$C_{70}$]fullerene oxidation.

Electrochemical and Spectroscopic Studies on the Interaction between DNA and the Product of Enzyme-catalyzed Reaction of OPD-H2O2-HRP

  • Niu, S.Y.;Zhang, S.S.;Ma, L.B.;Jiao, K.
    • Bulletin of the Korean Chemical Society
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    • v.25 no.6
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    • pp.829-832
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    • 2004
  • The pure product of 2,3-diaminophenazine was prepared by the enzyme-catalyzed reaction of ophenylenediamine-$H_2O_2$-horseradish peroxidase and characterized by UV/Vis spectroscopy, IR spectroscopy and NMR spectroscopy. The electrochemical behaviour of 2,3-diaminophenazine on the glassy carbon electrode was studied. The interaction between 2,3-diaminophenazine and deoxyribonucleic acid was studied by cyclic voltammetry method and UV/Vis spectroscopy, which indicated that the interaction between them is intercalation. The influence of reacting time was also studied. The binding ratio of the 2,3-diaminophenazine-DNA complex is calculated to be 1 : 2 and the binding constant is to be $5.07{\times} 10^3L{\cdot}mol^{-1}$ at room temperature.

The Chemical Constituents from Unidentified Sponge (해면의 화학적 성분 연구)

  • Park, Seon Gu;Paul J. Scheuer
    • Journal of the Korean Chemical Society
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    • v.38 no.2
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    • pp.169-173
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    • 1994
  • The previously reported cytotoxic metabolites, against the KB cell line, xestoquinone, halenaquinol sulfate and $halenaquinol^{5,6}$ were isolated from the unidentified sponge collected in October 1992, Manado Bay, Sulawesi in Indonesia. Their structure were elucidated by $^1H-,\;^{13}C$-NMR, $^1H-,\;^{13}C$(1 bond) Heteronuclear Multiple Quantum Coherence Spectroscopy$(HMQC)^1$, $^1H-,\;^{13}C$C(2 and 3 bond) Heteronuclear multiple Bond Correlation Spectroscopy$(HMBC)^2$, Electron Impact Mass Spectroscopy(EI ms), Ultraviolet Spectroscopy(UV), and Infrared Spectroscopy(IR)

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The Study of Doxorubicin and its Complex with DNA by SERS and UV-resonance Raman Spectroscopy

  • Lee, Chul-Jae;Kang, Jae-Soo;Kim, Mak-Soon;Lee, Kwang-Pill;Lee, Mu-Sang
    • Bulletin of the Korean Chemical Society
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    • v.25 no.8
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    • pp.1211-1216
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    • 2004
  • The interaction of the antitumour agent doxorubicin with calf thymus DNA is investigated in an aqueous solution at a pH level of 6-7 with molar ratios of 1/10. A UV-resonance Raman spectroscopy and surface enhanced Raman spectroscopy are used to determine the doxorubicin binding sites and the structural variations of doxorubicin-DNA complexes in an aqueous solution. Doxorubicin intercalates with adenine and guanine via a hydrogen bond formation between the N7 positions of purine bases and the hydroxyl group of doxorubicin.

Analyses of Additives Applied in a Polycarbonate (폴리카보네이트에 사용된 첨가제의 분석)

  • Kim, Seog-Jun
    • Analytical Science and Technology
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    • v.13 no.3
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    • pp.282-290
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    • 2000
  • In this study, polymer additives were extracted and separated by Soxhlet extraction method and the dissolution-precipitation method from a polycarbonate (optical grade) which completely absorbed UV light below 390 nm. Analytical techniques such as UV-Vis spectroscopy, FT-IR, and HPLC were applied to analyze additives in polycarbonate. Separated materials from the polycarbonate may be a complex mixture containing additives such as UV stabilizer, antioxidants (primary and secondary), monomers, and oligomers. Several compounds such as bisphenol A, Irganox 1010, and Cyasorb UV-5411 were identified by chromatograms and UV spectra obtained from RP HPLC analysis using Bondapak $C_{18}$ column, methanol mobile phase, and a photodiode array (PDA) detector. Also, the content of UV-5411 in the polycarbonate was about 0.12 wt% by a quantitative analysis through UV spectroscopy.

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Photostabilization and Cure Kinetics of UV-Curable Optical Resins Containing Photostabilizers

  • Cho, Jung-Dae;Kim, Sung-Hwa;Chang, In-Cheol;Kim, Kwon-Seok;Hong, Jin-Who
    • Macromolecular Research
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    • v.15 no.6
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    • pp.560-564
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    • 2007
  • The photostabilization and cure kinetics of UV-curable, optical resins containing various formulations of photostabilizers were investigated to determine the system with the highest cure conversion and durability. Photo-DSC analysis revealed that increasing the concentration of a UV absorber (UVA) decreased both the crosslink density and the cure rate due to competition for the incident photons between the photoinitiator and the UVA, whereas including a hindered amine light stabilizer (HALS) hardly affected either the cure conversion or the cure rate due to its very low absorption of 365 nm. This result was confirmed by FTIR-ATR spectroscopy and UV-visible spectroscopy analyses. QUV ageing experiments showed that the cure conversion and durability were the highest for the UVA/HALS formulation at a ratio of 1 : 2, which is due to their synergistic action.

Spectroscopic Analysis of Alkylbenzenes as Synthetic Lubricant Base Oils (합성 윤활기유로서의 알킬벤젠의 분광분석)

  • Choi, Ju-Hwan;Jeong, Hyuk;Kim, Hai-Dong
    • Analytical Science and Technology
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    • v.10 no.2
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    • pp.139-145
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    • 1997
  • Alkylbenzenes used as synthetic lubricant base oils have been analyzed to find the quantity of mono- and di-substituted alkyl aromatic hydrocarbon compositions and the number of carbon atoms in alkyl chains by $^{13}C$-NMR, near-infrared, and UV-Vis spectroscopy. Also, linear long chain alkylated benzene in the engine lubricants was analyzed quantitatively by infrared spectroscopy.

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A study on the color analysis of the pigment by UV-Visible spectroscopy (분광분석기를 이용한 안료의 색상분석에 관한 연구)

  • Jung, Choong-Ho;Kang, Tae-Hee
    • Journal of the Korean Applied Science and Technology
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    • v.27 no.4
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    • pp.515-521
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    • 2010
  • In this research, we were prepared the glazed ceramic samples by the change of the pigment content and investigated to reveal the standardized color. The chemical composition of the pigment was analyzed using a ICP-OES. XRF mapping and UV-Vis spectroscopy were used to evaluate the color property and surface homogeneity. The color development was observed as a result of analyzing the pigment content and change of the color. The pigment content and the spectral reflection showed the relation of the inverse proportion and the standardized color which could be revealed through analysis data.