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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Analytical Science and Technology
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Journal DOI :
The Korean Society of Analytical Science
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Volume & Issues
Volume 19, Issue 6 - Dec 2006
Volume 19, Issue 5 - Oct 2006
Volume 19, Issue 4 - Aug 2006
Volume 19, Issue 3 - Jun 2006
Volume 19, Issue 2 - Apr 2006
Volume 19, Issue 1 - Feb 2006
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Analysis of Mono-, Di- and Tri-glycerides by high-performance liquid chromatography (HPLC) with evaporative light scattering detection (ELSD)
Lee, Man-Ho ; Park, Heai-Ku ; Kim, In-Whan ;
Analytical Science and Technology, volume 19, issue 3, 2006, Pages 189~193
Chromatographic separation of glycerol monostearate, glycerol distearate and glycerol tristearate (GMS, GDS, and GTS) has been performed by normal phase HPLC method utilizing a Zorbax silica (
) column and hexane-hexane, IPA and ethyl acetate mixtures as the eluent within 20 min. The observed reproducibility was less than 5% RSD, Suggesting that ELSD was an effective tool for detection of the glycerol stearates of low volatility without chromophore. The detection limits were in the concentration range of 0.3~2 mg/L, and the calibration curves (the log-log plots) were linear in the range of 4~1000 mg/L (with the slopes of 1.06~1.32). The application of the analytical procedure without pretreatment demonstrated that the proposed chromatographic method would be practical for a routine analysis of commercial products.
Extraction and effect of whitening agents from chinese plants
Jin, Yinzhe ; Li, Guanghua ; Ahn, So Young ; Kim, Eun-Ki ; Row, Kyung Ho ;
Analytical Science and Technology, volume 19, issue 3, 2006, Pages 194~202
In this work, extraction and purification of the possible whitening agents from the Chinese plants; Chrysanthemum morifolium Ramat (xizang cai ju hua), Rhodiola sachalinensis, and Terminalia chebula Retzius have been described. The chopped leaves of Chrysanthemum morifolium Ramat and Terminalia chebula Retzius were added to water and ethyl ether, respectively. Components were separated on a GS310 column (
) and concentrated into four or three portions. The chopped leaves of Rhodiola salientness were added to methanol and separated and concentrated on a column (
F8;300 mm i.d.,
) into two parts. The whitening effects of extracts were examined by in-vitro melanin production assay, in melana and B16 cells at a concentration of
. The ethyl acetate layer of Chrysanthemum morifolium Ramat showed 92% melanin inhibitory at
, the extract of Rhodiola sachalinensis showed a whitening effect of about 60% melanin inhibitory, which was more efficient than the whitening effect of arbutin (45.6%). The methanol extract of Terminalia chebula Retzius inhibited melanin expression by 90% at
; however, it was toxic to B16 melanoma cells.
Determination of selenium in milk powder by octopole reaction cell ICP-MS
Cho, Sung-Eel ; Kim, Mi-Ju ; Kim, Yong-Ha ; Min, Young-Keun ; Kim, Young-Sang ;
Analytical Science and Technology, volume 19, issue 3, 2006, Pages 203~210
The determination of trace selenium in milk powder has been studied by octopole reaction cell(ORC)-ICP-MS. The interferences by polyatomic ions and other concomitant molecular species could be removed remarkably by using
as reaction gas in ORC. Compared to the normal mode (no cell gas), the
cell gas mode improved the accuracy and precision. The quantitative result was average 102.7% and it was slightly higher than certified standard value of milk powder and the RSD was 7.6%.
Self-assembly directed synthesis of tubular conducting polymer inside the channels of MCM-41
Showkat, Ali Md. ; Lee, Kwang-Pill ; Gopalan, Anantha Iyengar ; Reddy, K. Raghava ; Kim, Sang-Ho ; Choi, Seong-Ho ;
Analytical Science and Technology, volume 19, issue 3, 2006, Pages 211~217
Diphenyl amine (DPA) was polymerized inside the channels of the mesoporous silica (MCM-41). MCM-41 (C) and MCM-41 (D) were prepared with cetyltrimethyl ammonium bromide (CTAB) and dodecyltrimethyl ammonium bromide (DTAB), respectively and used as hosts. Initially, the self assembly of DPA inside the pores of MCM-41 was made in
-naphthalene sulfonic acid (NSA) medium and subsequently poly (diphenylamine), PDPA was formed by oxidative polymerization.
adsorption-desorption measurements of PDPA loaded MCM-41 (C) and MCM-41 (D) show variations in pore volume and surface area between them. A tubular form of poly (diphenylamine), PDPA was envisaged to form in the pores of MCM-41 and supported by high resolution transmission microscopy. The presence of PDPA inside the channel of MCM-41 was further confirmed by FTIR spectroscopy, thermogravimetric analysis (TGA), X-ray diffraction.
Synthesis of molecularly imprinted polymer (MIP) by radiation-induced polymerization and separation of ferulic acid from rice oil using MIP-packed column
Yoon, Seok-Kee ; Lee, Jae-Chan ; Lee, Seung-Ho ; Choi, Seong-Ho ; Kim, Hwa-Jung ; Park, Hae-Jun ; Kang, Hee-Dong ;
Analytical Science and Technology, volume 19, issue 3, 2006, Pages 218~225
A molecularly imprinted polymer (MIP) was synthesized by radiation-induced polymerization (RIP), where the ferulic acid was used as a template molecule, 4-vinylpyridine as a monomer and ethylene glycoldimethacrylate (EGDMA) as a cross-linking monomer. The MIP was packed in a glass column using a slurry method for use in medium pressure liquid chromatography (MPLC). The MPLC column was tested for separation and purification of ferulic acid from the rice oil. When repeated three times, the MPLC separation/purification yielded the ferulic acid with the purity higher than ~99%. The chemiluminescence of the luminal (5-amino-2,3-dihydro-1,4-phtalazinedione) measured on a potato disc slide (5.0 mm thick) was enhanced in the presence of ferulic acid, while, without the ferulic acid, the chemiluminescence of luminol on the potato slice disc was not observed, which suggests the ferulic acid obtained from the rice oil can be useful for immunoassay.
Comparative investigation of activated porous carbons treated by silver electroplating from aqueous solution
Oh, Won-Chun ;
Analytical Science and Technology, volume 19, issue 3, 2006, Pages 226~238
The electroplating of the Ag ions from aqueous solution on activated porous carbons was investigated over a wide range of plating time. The adsorption capacities of Ag metallic carbons were associated with their internal porosity and were related to physical properties such as surface area and pore size distribution. And, surface morphologies and quantitative analysis for the metal supported carbons are investigated by scanning electron microscopy (SEM) and energy disperse X-ray (EDX) measurements to explain the changes in adsorption properties. It is considered that the pH is an very important factor at the reason of water pollutant with increasing acidity in industrial field. The results of ICP-AES analysis showed that the residual concentration of Ag ions decreased with an increasing electroplating time. The metallic Ag-activated porous carbons electroplated showed microbicidal effects and strong antibacterial activity against six kinds of strains that were used. Finally, we confirmed that the presence of the electrolytic plated Ag-activated porous carbons is a determining factor in the HCl removal by chemical reaction, clarifying the surface chemical behavior.
Determination of itraconazole in human plasma by high performance liquid chromatography
Jang, Hae Jong ; Lee, Ye Rie ; Lee, Kyung Ryul ; Han, Sang-Beom ; Kang, Seung Woo ; Lee, Hee Joo ;
Analytical Science and Technology, volume 19, issue 3, 2006, Pages 239~243
This method is used for the determination of itraconazole in human plasma by liquid-liquid extraction and high performance liquid chromatography. Felodipine was used as an internal standard. After extraction of the plasma with diethyl ether, the centrifuged upper layer was then transferred. The supernantant was evaporated and then reconsituted with mobile phase. The mobile phase was composed of 10 mM ammonium acetate adjusted to pH 7 by phosphoric acid with a flow rate of 0.2 mL/min. A C18 reversed-phase column with a pre-column was used as the analytial column. Linear detection responses were obtained for itraconzole concentration range for 2~1,000 ng/mL. The correlation coefficient of linear regression(
) was 0.9991, limit of quantification (LOQ) was 2 ng/mL, reproducibility was less than 10.8 %, and accuracy was 97.2~108.2%. This method has been successfully applied to the pharmacokinetic study of itraconazole in human plasma.
Monitoring of residue PBDEs level in human milk and fish & shellfish samples collected from Korea
Jang, Myungsu ; Cha, Sujin ; Kang, Younseok ; Park, Jongsei ;
Analytical Science and Technology, volume 19, issue 3, 2006, Pages 244~254
Flame retardants are added to prevent catching fire and to slow down the burning process. PBDEs are known to affect thyroid hormones and hormone disruption. The aim of this study was to propose a manual for determination of PBDEs, and investigate the accumulation of PBDEs(BDE-28, 47, 99, 100, 153, 154 and 183) in fish&shellfish and human milk samples. Pre-treatment for PBDEs determination, alkali digestion and L-L(Liquid-Liquid) extraction method could be applied to fish and shellfish. When Multi-layer column was used for cleaning up the sample, 50 mL of hexane and 100 mL of hexane:dichloromethane(9:1) solutions were used for pre- and post-elution, respectively. Activated-carbon column was optimized by a 100 mL of hexane:dichloromethane(3:1). The result of fish, highest concentration was detected in flatfish, 890 pg/g(wet weight). The other side, lowest concentration was detected in pollack, 40 pg/g(wet weight). The result of breast milk, PBDEs was detected 2,580 and 3,600 pg/g(lipid weight) from breast milk of Seoul and Juju, respectively. BDE-153 and 183 were not detected in all samples. There was no difference in PBDEs level was not difference between first and second delivery. In this study, we could find that PBDEs level in Korea is lower than other countries.
A preliminary study of sorptive characteristics of aromatic volatile organic compounds (VOC) on clothing materials
Kim, K.H. ; Im, M.S. ; Park, S.Y. ; Hong, Y.J. ; Choi, Y.J. ; Lee, Y.S. ; Kim, S.D. ; Nam, S.H. ; Ok, J.S. ;
Analytical Science and Technology, volume 19, issue 3, 2006, Pages 255~262
In this study, we attempted to evaluate the sorptive loss of VOC upon their contact with different material surfaces including clothing pieces. For the purpose of this study, we developed a method to evaluate such loss by employing a filter holder pack in the thermal desorption line of the GC/FID system. The calibration curves of different aromatic VOCs including benzene, toluene, and xylene were made by loading them at different quantities through the analytical line. A series of experiments were conducted repetitively to draw calibration data sets for all three materials covering glass fiber, cotton, and nylon. The results were then compared in terms of both material types and of VOC types. The extent of sorptive loss increased in a highly systematic manner across different materials such as glass fiber, cotton, and nylon. The patterns of sorptive loss also increased gradually across VOC type such toward in the direction of increasing molecular weights: benzene, toluene, and xylene. According to this experimental study, it is concluded that sorptive behavior of pollutint compounds like VOC can be controlled by the combined effects of both chemical properties and material characteristics.
Contamination level and congener profiles of PCBs, Co-PCBs and PCDD/DFs in transformer insulation oil samples
Kim, Kyoung-Soo ; Kim, Jong-Guk ; Shin, Sun-Kyoung ; Kim, Kyoung-Sim ; Song, Byung-Joo ;
Analytical Science and Technology, volume 19, issue 3, 2006, Pages 263~271
The levels of total PCBs, Co-PCBs and PCDD/Fs in the transformer insulation oil samples obtained using GC/ECD and HRGC/HRMS were ranged from N.D. to 77.3 ppm, from 0.0863 to 2.49 ppm and from N.D. to 0.00241 ppm, respectively. In terms of WHO-TEQ values, Co-PCBs and PCDD/Fs were ranged from 23.3 to 600 pgTEQ/g and from N.D. to 128 pgTEQ/g, respectively (
-PCBs+PCDD/Fs concentration was calculated 24.4~728 pgTEQ/g). Although, the contribution of PCDD/Fs was below 12% in total TEQ concentration, it is suggested contamination of PCDD/Fs in transformer insulation oils. Among 10 samples, 4 samples showed higher concentration than 2 ppm (specific waste criterion of Korea) and Aroclor 1242, 1248, 1254 and 1260 was detected in samples as a single or mixture of Aroclor. It was shown reliable relationship between concentration of Co-PCBs and those of PCDD/Fs (p<0.003), however, was not shown between production year of transformer and concentration of PCBs. The distribution pattern of Co-PCB congeners showed that the ratios of mono-ortho substituted congeners were higher than non-ortho substituted congeners. Among that, PCB-118 congener was predominant. In addition, the OCDD congener was predominated in PCDD/Fs congeners as above 53%. Moreover, the congener pattern of Co-PCBs was similar to that of Aroclor as well as ambient air, which suggested that PCBs volatilization from transformer insulation oil affected the pattern of Co-PCBs in ambient air.