• Title, Summary, Keyword: Chemical Analyses

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Molecular Recognition : ${\alpha}$-Cyclodextrin and Aspirin Inclusion Complexation

  • Hee Sook Choi
    • Bulletin of the Korean Chemical Society
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    • v.13 no.5
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    • pp.474-479
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    • 1992
  • Molecular interaction between ${\alpha}$-cyclodextrin and aspirin was studied by UV, $^2H$-NMR and $^2H$-NMR spectroscopy analyses for solution complex and by FT-IR analyses for solid complex. The inclusion structure provides a basic understanding of the aspirin and ${\alpha}$-cyclodextrin interaction.

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Secondary Mineral Formation and Concrete Deterioration Caused by Certain Environmental Conditions (특정환경조건하에서의 콘크리트 내 이차광물생성과 그에 수반된 성능저하현상)

  • 이효민;황진연;진치섭;이진성;전쌍순
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.651-656
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    • 2003
  • Durability of concrete is possibly related to externally-induced chemical attacks in addition to internally-induced deterioration. Externally-induced chemical attacks can be derived from various sources according to environmental conditions under which concrete structures are existing. The present study investigates the characteristic concrete deterioration and formation of secondary minerals by external chemical attacks under certain environmental condition. Petrographic microscope, SEM, EDAX, XRD analyses were conducted to identify secondary mineral formation and micro-structural analyses.

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Effect of Grinding on Color and Chemical Composition of Pork Sausages by Near Infrared Spectrophotometric Analyses

  • Kang, J.O.;Park, J.Y.;Choy, Y.H.
    • Asian-Australasian Journal of Animal Sciences
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    • v.14 no.6
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    • pp.858-861
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    • 2001
  • Near Infrared spectroscopy was applied to the samples of processed pork to see the effect of grinding on chemical components analyses. Data from conventional chemical analyses of moisture, fat, protein, NaCl were put into calibration model by NIR of reflectance mode. The other properties observed were pH and color parameters ($L^*,\;a^*,\;b^*$). Spectral ranges of 400~2500 nm and 400~1100 nm were compared for color parameters. Spectral ranges of 400~2500 nm and 1100~2500 nm were compared for chemical components and pH. Different spectral ranges caused little changes in the coefficients of determination or standard errors. $R^{2,}s$ of calibration models for color parameters were in the range of 0.97 to 1.00. $R^{2,}s$ of calibration models of intact sausages for moisture, protein, fat, NaCl and pH were 0.98, 0.89, 0.95, 0.73 and 0.77, respectively using spectra at 1100~2500 nm. $R^{2,}s$ of calibration models of ground sausages for moisture, protein, fat, NaCl and pH were 0.97, 0.91, 0.97, 0.42 and 0.56, respectively using spectra at 1100~2500 nm.

BEAD BASED CHEMICAL REACTION SYSTEM USING TEMPERATURE AND FLUID CONTROL FOR CANCER DETECTION (유체와 온도 조절을 이용한 생화학 물질 반응용 마이크로칩의 개발)

  • Kim, Min-Su;Lee, Bo-Rahm;Yoon, Hyo-Jin;Kim, Byung-Gee;Lee, Yoon-Sik;Kim, Yong-Kweon
    • Proceedings of the KIEE Conference
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    • pp.1466-1467
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    • 2008
  • We describe here a novel micro total analysis system for the purification and identification of the affinity-captured proteins. Also we demonstrated the mass analysis of the Carcinoembrionic antigen (CEA) and Alpha femtoprotein which were chosen as the target cancer marker. For MALDI-TOF analyses, the proteins should to be separated from a protein mixture and be concentrated when needed. This procedure usually takes a long time even before protease-digested samples are to be obtained from them. Here, we describe integrated and efficient micro chip for protein purification and digestion for MALDI-TOF analyses. At first, disease protein is purified by passing the micro chamber from a protein mixture or human whole serum and released from the micro affinity beads by thermal heating. Purified protein is then transfer to the hole for trypsin digestion. The final sample is analyzed by MALDI-TOF. All the processes could be finished successfully within one hour, which renders MALDI-TOF analyses of a target protein quite simple.

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Structural Diversity of Five New Lanthanide Coordination Polymers Tuned by Different Salt Anions

  • Tao, Yinhua;Lou, Yongbing;Li, Yang;Chen, Jinxi
    • Bulletin of the Korean Chemical Society
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    • v.35 no.5
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    • pp.1417-1421
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    • 2014
  • Five new lanthanide coordination polymers, $[Ln_2(1,4-NDC)_2(1,4-HNDC)_2(phen)_2]_n$ (Ln = Er (1), Yb (2)), and $[Ln_2(1,4-NDC)_3(phen)_2(H_2O)_2]_n$ (Ln = Nd (3), Gd (4), Er (5)) ($1,4-H_2NDC$ = 1,4-naphthalenedicarboxylic acid, phen = 1,10-phenanthroline), have been successfully prepared via the reaction of corresponding trivalent lanthanide salt, $1,4-H_2NDC$ and phen in the presence of NaOH and pyridine under hydrothermal condition. Pyridine plays a key role in the synthesis of these lanthanide coordination polymers. Single-crystal X-ray diffraction analyses indicate that compounds 1-5 all form a 2-D network while different salt anions result in the diversity of crystal structures. These lanthanide coordination polymers showed a considerable thermal stability in TGA analyses.

ligand Field Analyses of Tris(biuret)chromium(Ⅲ) Chloride and Hexaureachromium(Ⅲ) Bromide

  • 박성진;오병근;박영동;이규왕
    • Bulletin of the Korean Chemical Society
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    • v.20 no.8
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    • pp.943-947
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    • 1999
  • Ligand field analyses for tris(biuret)chromium(III) chloride and hexaureachromium(III) bromide were performed and compared to understand the ligand field properties of both ligands. The optimized eσO and eπO values indicate that coordinated oxygen atom in biuret ligand is a moderate s- and strong p-donor, while that in urea ligand is a weak σ- and moderate π-donor. The electronic structures of those two complexes are quite different and they were well accounted by inclusion of an anisotropic p bonding.

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Characteristics of Mineral and Thermal Waters in South Korea (II) (한국 온천수의 수질적 특성(II))

  • 임정웅
    • Journal of the Korean Professional Engineers Association
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    • v.33 no.1
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    • pp.75-82
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    • 2000
  • 299 chemical analyses are used to study the characteristics of mineral and thermal waters in South Korea. Even though the concentration of chemical components in thermal waters are generally very low, mineral waters having components more than 1,000 ppm of dissolved total solid(TDS) are reached up to 1975 of total analyses data, In Germany, Japan or some other countries, mineral and thermal waters are defined not only by water temperature, but also by chemical components. The principle of Law in Japan is also almost same with the German regulations. However, the Law for thermal spring In Korea permit thermal water to be qualifiled only by water temperature. For including chemical characters into the regulations or Law of thermal spring, the limit values of TDS and other 9 micro components related to mineral and thermal waters was selected through this study.

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Seawater Quality And Red Tides In Jinhae Bay:I. Relationships Between Water Quality Parameters And Red Tides

  • Lee, Kwang Woo;Hong, Gi-Hoon;Yang, Dong-Beom;Lee, Soo-Hyung
    • 한국해양학회지
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    • v.16 no.2
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    • pp.43-48
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    • 1981
  • To carry out baseline studies on monitoring systems for red tides in Jinhae bay, measurements and analyses were made on seawater samples from 15 sampling stations during 15 months from July, 1979. Water quality parameters studied are temperature, pH, DO, salinity, COD, SS, NO$\sub$3/, NO$\sub$2/, PO$\sub$4/, SiO$\sub$2/, Ca, Mg, Cd, Cu, Pb, Zn, Chlorophyll ${\alpha}$, diatoms and dinoflagellates. Multiple regression analyses were undertaken with chlorophyll ${\alpha}$, cell numbers of diatoms and dinoflagellates as the dependent variables and water quality parameters as the independent variables. The results showed that biomass, expressed as total cell numbers of diatoms and dinoflagellates, was largely influenced by COD, salinity and nutrients.

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