• Title/Summary/Keyword: Derivative Spectrophotometry

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Fundamental Investigation of Non-invasive Determination of Alcohol in Blood by Near Infrared Spectrophotometry (근적외선 분광분석법을 이용한 음주측정기술 개발에 관한 연구)

  • Chang, Soo-Hyun;Cho, Chang-Hee;Woo, Young-Ah;Kim, Hyo-Jin;Kim, Young-Man;Lee, Kang-Boong;Kim, Young-Woon;Park, Sung-Woo
    • Analytical Science and Technology
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    • v.12 no.5
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    • pp.375-381
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    • 1999
  • Near infrared spectrophotometry(NIR) was developed as a non-invasive determination of blood alcohol. The first pure alcohol/water samples were prepared with ethanol concentration from 0.01 to 0.1%(w/w). Analysis of the second-derivative data was accomplished with multilinear regression(MLR). The standard error of calibration(SEC) of ethanol in ethanol/water solutions was approximately 0.0039%. The calibration models were established from the blood alcohol spectra by MLR and PLSR analysis. The best calibration was built with the second-derivative spectra of 2266 and 2326 nm by MLR. Second-derivative spectra in the spectral ranges of 1100~1340, 1500~1796 and 2064~2300 nm with four PLSR factors provided the standard error of prediction(SEP) of 0.030%(w/w). These results indicate that NIR may be applied for a fast non-invasive determination of alcohol in the blood.

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Synchronous determination of polycyclic aromatic hydrocarbons(PAHs) in sediment of Ulsan Bay by synchronous 2nd derivative fluorescence spectrophotometry (이차 미분 형광 분광광도법에 의한 울산만 해양 저질토양 중의 다환 방향족 탄화수소(PAHs)의 동시 분석)

  • Yoo, Kwang-Sik;Jyoung, Jy-Young;Jeong, Seon-Yi
    • Analytical Science and Technology
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    • v.17 no.1
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    • pp.45-52
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    • 2004
  • Determination of some PAHs in sediments at Ulsan bay has been carried out by extraction of the components into n-hexane followed by synchronous spectrofluorimetric technique. 11 PAHs, such as acenaphthene (Ace), anthracene (Anth), benz(a)anthracene (BaA), benzo(b)fluoranthene (BbFt), benzo(k)fluoranthene (BkFt) benzo(a)pyrene (BaP), chrysene (Chry), phenanthrene (Phen), fluoranthene(Ft), perlyrene (Per), and pyrene (Pyr) in sediment samples were able to determine separately by synchronous spectrofluorimetry. Calibration curves for those components were linear for the concentration range of 0.15~166 ppb PAHs with the correlation factor of 0.9985~0.9999. The total amount of PAHs in sediments varied from 68.8 to 324.4 ng/g. The PAHs concentration was shown a tendency to increase from the outer bay to the inner basin as well the predominant contributors to the aromatic ring groups of the PAHs was 4-ring group.

Effects of Steroidal Carbamate Derivatives on the Aflatoxin Productivity by Aspergillus flavus (Aspergillus flavus에 의한 Aflatoxin 생산능(生産能)에 Steroidal Carbamate Derivatives가 미치는 영향(影響))

  • Jung, Seung-Jae;Suh, Myung-Ja
    • The Korean Journal of Mycology
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    • v.13 no.4
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    • pp.243-247
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    • 1985
  • Experiments were conducted to study effects of steroidal carbamate derivatives upon mycelial growth and aflatoxin production by Aspergillus flavus ATCC 15517. The basal medium was supplemented with various concentrations of these compounds and inoculated with spores. The developing cultures were incubated for 11 days at $28^{\circ}C$ without agitation. Aflatoxins were extracted with chloroform, separated by thin layer chromatography, and quantitated by ultraviolet spectrophotometry. At a concentration of 50 mg per 30 ml of medium., stigmasteryl-N-(2-chloroethyl) carbamate, cholesteryl- N - (2-chloroethyl) carbamate, $5{\alpha}-cholestan-3-one-oximino-N-(2-chloroethyl)$ carbamate and ${\beta}-sitosteryl-N-(2-chloroethyl)$ carbamate were the most effective in reducing aflatoxin production by Aspergillus flavus. However, cholest-4-ene-3-one-oximino-N-(2-chloroethyl) carbamate, at a concentration of 100 mg per 30 ml, significantly decreased aflatoxin production. There was no significant inhibition of mycelial growth by the addition of the various concentrations of these compounds.

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Long term life-time of electrochromic poly (3-hexyl thiophene) films modified by surfactant-assisted graphene oxide layers. (계면활성제 기반 산화그래핀층이 도입된 전기변색 poly (3-hexyl thiophene) 박막의 장기 수명 특성)

  • Kim, Tae-Ho;Choe, Gi-In;Kim, Hye-Ri;O, Seong-Hyeon;Gu, Ja-Seung;Na, Yun-Chae
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2016.11a
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    • pp.147-147
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    • 2016
  • In general, organic electrochromic (EC) materials have been known to be electrochemically unstable during the ionic exchange process. One effective method to realize stable EC materials is incorporating graphene derivatives in the polymer matrix, by using the strong interaction between graphene derivatives and polymer. However, previous studies are limited graphene derivatives. In this study, we developed a polymer-graphene derivative complex with the chemical assistance of a surfactant (octadecylamine, ODA). Surfactant-assisted graphene oxide (GO-ODA) was introduced as a protective layer on the electrochromic poly (3-hexyl thiophene) (P3HT) films by the Langmuir-Schaefer method. The deposition of GO-ODA protective layer with high coverage was confirmed by atomic force microscopy. The strong interactions between GO-ODA and P3HT were examined with UV-Vis spectrophotometry and X-ray photoelectron spectroscopy. Electrochemical and electrochromic investigations revealed that the GO-ODA layer greatly improved the long-term cyclability of the P3HT film. These findings imply that the GO-ODA complex has a significant role in creating stable EC cycling, due to its strong interaction with the P3HT film.

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Tetradiazo(o-carboxy)phenylcalix[4]arene for Determination of Pb2+ Ion

  • Tan, Le Van;Quang, Duong Tuan;Lee, Min-Hee;Kim, Tae-Hyun;Kim, Ha-Suck;Kim, Jong-Seung
    • Bulletin of the Korean Chemical Society
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    • v.28 no.5
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    • pp.791-794
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    • 2007
  • A new azocalix[4]arene, 5,14,17,23-tetra[(2-benzoic acid)(azo)phenyl] calix[4]arene (2), has been prepared by hydrolysis of its ester derivative and characterized by 1H NMR, IR, UV-Vis spectroscopy and elemental analysis. Based on UV spectral changes, we found that 2 exhibits Pb2+ ion selectivity. In basic media, Pb2+ forms a 1:1 complex with the ligand. Beer's law is obeyed in the range of 2.0 × 10?6 ? 2.4 × 10?5 mol L?1 of Pb2+. The molar absorptivity (ε ) of 2-Pb2+ complex is 1.89 × 104 L mol?1 cm?1 at 440 nm, and the detection limit is 1.6 × 10?6 mol L?1.

A Study on the Kinetics and Mechanism of the Hydrolysis of 5,6-Dihydro-1,4-thiazine Derivatives (5,6-Dihydro-1,4-thiazine 유도체의 가수분해 메카니즘과 반응속도론적 연구)

  • Lee, Gwang Il;Lee, Seok U;Gwak, Cheon Geun;Jang, Byeong Man;Kim, Yeong Ju;Lee, Gi Chang
    • Journal of the Korean Chemical Society
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    • v.38 no.5
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    • pp.366-371
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    • 1994
  • The kinetics of the hydrolysis of 5,6-dihydro-1,4-thiazine derivatives was investigated by ultraviolet spectrophotometry in $H_2O$ at 25$^{\circ}C$. A rate equation which can be applied over a wide pH range was obtained. The substituent effects on the hydrolysis of 5,6-dihydro-1,4-thiazine derivatives were studied and the rate of hydrolysis was shown to be accelerated by electron donating groups. Final product of the hydrolysis was 2-(N-acetylaminoethylthio)-acetoacetanilide enol from Judging from the results of the rate equation, general base effect, activation parameters and final products, the hydrolysis of 5,6-dihydro-1,4-thiazine derivatives seemed to be initiated by the neutral $H_2O$ molecule which does not dissociate at pH below 10.0, but proceeded by the hydroxide ion at pH above 11.0, and those two reactions occurred competively at pH 10.0∼11.0 range. On the basis of these findings a plausible mechanism for the hydrolysis of 5,6-dihydro-1,4-thiazine derivative was proposed.

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Studies on 1,2-Naphthoquinone-(2)diazide-5-sulfonic Acid Ester Derivatives for Pre-sensitized Offset Plates (PS 판용 1,2-Naphthoquinone-(2)diazide-5-sulfonic Acid Ester Derivatives의 합성 및 응용)

  • Ku, Yang Seo;Myung, Young Chan;Ahn, Chong Il;Kim, Sun Ho
    • Applied Chemistry for Engineering
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    • v.10 no.8
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    • pp.1169-1174
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    • 1999
  • 2-Diazo-1-naphthoquinone-5-sulfonyl chloride(NQD-Cl) was synthesized from sodium 2-diazo-naphthoquinone-5-sulfonate by chlorination. NQD-Cl was esterified with hydroxybenzophenones to give several 1,2-naphthoquinone-(2)-diazide-5-sulfonic acid ester derivatives(NQD-esters). We have compared benzophenone derivatives with methoxy group to benzophenone derivatives with hydroxy group. Solubility of each NQD-ester was studied. Each of NQD-esters was formulated with novolac base resin and PS plates were manufactured. Photosensitivity, bleachability, compatible exposed time and relative sensitivity were determined by UV spectrophotometry, imaged by UV lithographic techniques, and the gray scale method. According to the number of substituted NQD group, it showed that relative sensitivity was different from gray scale method. NQD-esters with methoxy group showed a good solubility and higher sensitivity than commercial PS ones.

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