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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Analytical Science and Technology
Journal Basic Information
Journal DOI :
The Korean Society of Analytical Science
Editor in Chief :
Volume & Issues
Volume 21, Issue 6 - Dec 2008
Volume 21, Issue 4 - Oct 2008
Volume 21, Issue 5 - Oct 2008
Volume 21, Issue 3 - Aug 2008
Volume 21, Issue 2 - Jun 2008
Volume 21, Issue 1 - Feb 2008
Selecting the target year
Structure elucidation and determination of illegal compounds (Anti-impotance drug analogues) in foods
Choi, Dongmi ;
Analytical Science and Technology, volume 21, issue 2, 2008, Pages 65~83
It is noted that illegal hazardous foods containing unauthorized drugs or synthetic drung analogues are increasing. Especially, reported are unknown compounds that have the modified chemical structures of the anti-impotence drugs such as sildenafil, vardenafil, and tatalafil. In addition, it is very reserved, since illegal synthetic compounds having similar chemical structures modified from anti-impotence drug to avoid the government inspection are not proved their safety at all. This review in ulation to food safety, lists the illegal compounds added to foods and describes about the analytical methods to chanacterize 16 anti-impotence drug analogues such as homosildenafil, hongdenafil, pseudovardenafil, aminotadalafil, hydroxyhomosildenafil, hydroxyhongdenafil, dimethylsildenafil, xanthoanthrafil, hydroxyvardenafil, norneosildenafil, demethylhongdenafil, piperidinohongdenafil, carbodenafil, thiosildenafil, dimethylthiosildenafil, and acetylvardenafil.
Analysis of caffeine in aqueous sample by hollow fiber-liquid microextraction (HF-LPME)
In, Chi-Yeon ; Kim, Taek-Jae ; Myung, Seung-Woon ;
Analytical Science and Technology, volume 21, issue 2, 2008, Pages 84~92
A method for the determination of trace amount of caffeine in urine and various drink samples using hollow fiber-liquid phase microextraction (HF-LPME) and capillary gas chromatograph/nitrogen phosphorus detector (GC/NPD) has been established. HF-LPME method has been optimized with respect to several experimental parameters including the effects of the hollow fiber length, extraction solvent, stirring mode, pH and salt concentration for the determination of caffeine from aqueous samples. The correlation coefficient of calibration curve for caffeine was 0.9994. The average recovery was 102%(n=3). The established method is feasible for the determination of trace amounts of caffeine in several aqueous sample. The limit of detection (LOD) and the limit of quantitation (LOQ) have been found to be 2.5 and 10 ng/mL, respectively. The established HF-LPME method for the analysis of caffeine from aqueous sample can be used for the determination of biological, food and environmental samples.
Determination of VOC in aqueous samples by the combination of headspace (HS) and solid-phase microextraction (SPME)
Park, Shin-Young ; Kim, Ki-Hyun ; Yang, H.S. ; Ha, Joo-Young ; Lee, Ki-Han ; Ahn, Ji-Won ;
Analytical Science and Technology, volume 21, issue 2, 2008, Pages 93~101
The application of solid phase microextraction (SPME) is generally conducted by directly immersing the fiber into the liquid sample or by exposing the fiber in the head space (HS). The extraction temperature, the time of incubation, and application of stirring are often designated to be the most important parameters for achieving the best extraction efficiencies of HS-SPME analysis. In this study, relative importance of these three analytical parameters involved in the HS-SPME method is evaluated using a polydimethylsiloxane/carboxen (PDMS/CAR) fiber. To optimize its operation conditions the competing relationships between different parameters were investigated by comparing the extraction efficiency based on the combination of three parameters and two contracting conditions: (1) heating the sample at 30 vs. 50 C, (2) exposing samples at two durations of 10 vs. 30 min, and (3) application of stirring vs. no stirring. According to our analysis among 8 combination types of HS-SPME method, an extraction condition termed as S50-30 condition ((1) 1200 rpm stirring, (2)
exposure temp, and (3) 30 min exposure duration) showed maximum recovery rate of 45.5~68.5% relative to an arbitrary reference of direct GC injection. According to this study, the employment of stirring is the most crucial factor to improve extraction efficiency in the application of HS-SPME.
Separation of liquiritin, glycyrrhizic acid and glabridin from licorice by RP-HPLC
Tian, Minglei ; Yan, Hongyuan ; Row, Kyung Ho ;
Analytical Science and Technology, volume 21, issue 2, 2008, Pages 102~108
Reversed-phase high performance liquid chromatography (RP-HPLC) was used for the simultaneous determination of liquiritin (LQ), glycyrrhizic acid (GA) and glabridin from licorice. An optimized run condition was selected with a binary gradient elution of methanol-water which ramped 35/65 to 80/20 (vol. %) in 0.0-8.0 min and a flow rate of 1.0 mL/min. A good linearity was obtained between 0.2 mg/mL and 1.0 mg/mL for LQ and GA, and 0.01 mg/mL-0.2 mg/mL for glabridin with the relative standard deviations less than 0.90% (n=5). The developed method was successfully applied to determination of the three components from licorice samples. The mean recoveries of three components are 80.79% for liquiritin, 89.71% for glycyrrhizic acid and 72.50% for glabridin.
Adsorption of uranium(VI) ion on the nitrogen-donor macrocyclic synthetic resin adsorbent
Kim, Joon-Tae ;
Analytical Science and Technology, volume 21, issue 2, 2008, Pages 109~116
Resins were synthesized by mixing 1-aza-18-crown-6 macrocyclic ligand into styrene(dangerous matter) divinylbenzene(DVB) copolymer with crosslink of 1%, 2%, 6% and 12% by substitution reaction. The synthesis of these resins was confirmed by content of chlorine, elemental analysis, thermogravimetric analysis, electron microscopy, and IR. The effects of pH, time, crosslink of resins and dielectric constant of solvent on adsorption of uranium ion by resin adsorbent were investigated. Uranium ion showed a great adsorption above pH 3 and adsorption equilibrium of metal ions was established in about two hours. In addition, adsorptive selectivity of resin in ethanol solvent was
ion and adsorption of uranium ion increased with the increase of the degree of crosslinking (1%~12%) and was inversely in proportional to the order of dielectric constant of solvents.
Development of ZnS(Ag)/plastic dual scintillator sheet for simultaneous alpha- and beta-ray counting
Seo, Bum-Kyoung ; Woo, Zu-Hee ; Kim, Gye-Hong ; Lee, Kune-Woo ; Lee, Dong-Gyu ; jung, Chong-Hun ;
Analytical Science and Technology, volume 21, issue 2, 2008, Pages 117~122
Dual scintillator for simultaneous alpha- and beta-ray counting used by detection materials of a surface contamination monitor was developed. In this study, preparation method was not a heat melting method but a solvent method, by which the counting material was manufactured by dissolving the polymer materials with solvent. It was simplified the preparation process. Plastic scintillator for beta-ray counting was prepared by solidifying the casting solution mixed with organic scintillator, polymer, and solvent. ZnS(Ag) scintillator layer was prepared by screen printing the paste solution mixed with ZnS(Ag), paste, and solvent onto the plastic layer. The good counting ability for alpha- and beta-ray using the ZnS(Ag)/plastic dual scintillator prepared and possibility for the counting material of surface contamination monitor was confirmed.
A study on the preparation and analysis of cordierite by sol-gel method
Chun, Kyung Soo ; Lee, Young Hwan ;
Analytical Science and Technology, volume 21, issue 2, 2008, Pages 123~128
The golden turbid solution of cordierite precursor was obtained by using magnesium ethoxide in sol-gel method, while the clear solution of cordierite precursor was obtained when 5%-
solution was used in the sol-gel reaction.
component was confirmed by infrared spectra showing
and the stretching vibration of gelish
. The component of
and network structure of
. The component of MgO was confirmed at
as the stretching vibration. X-ray diffraction analysis showed
-cordierite crystal was showed up at temperature above
at the mole ratio of cordierite precursor and water (1:5).
-cordierite were coexisted at
for the mole ratio of cordierite precursor and ammonia (1:5) while
-cordierite was only existed at
for the same mole ratio as mentioned above.
Analysis for explosives in contaminated soil using the electrochemical method
Ly, Suw Young ;
Analytical Science and Technology, volume 21, issue 2, 2008, Pages 129~134
Cyclic voltammetry (CV) and square wave stripping voltammetry (SW) analysis of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) using the double-stranded ds calf thymus (DNA) mixed in carbon nanotube paste electrode (PE) were provided. The optimum analytical conditions were determined and the peak potential was 0.2 V vs. Ag/AgCl. The linear working ranges of CV (50-75 ug/L) and SW (5-80 ng/L) were obtained. The precisions of RSD in the 10 ug/L was 0.086% (n=15) and the detection limit was 0.65 ng/L (
) (S/N=3) with 300 s adsorption time at the optimum condition. The method was used to determine the presence of explosive chemicals in contaminated soil samples.
Content of plasticizers and heavy metals in the selling PVC wallpapers
Lee, Cheol-Won ; Jung, Tak-Kyo ; Kim, Man-Goo ;
Analytical Science and Technology, volume 21, issue 2, 2008, Pages 135~142
Plasticizer and heavy metals in domestic PVC wallpaper manufactured in Korea after 2005 were analyzed to identify the contained quantity in comparison with the 2002 manufactured PVC wallpapers. Plasticizer of wallpapers was analyzed by the method KSM1991 which uses soxhlet extraction with n-hexane and GC/FID. Heavy metals were pre-treated with 0.07 mol/L hydrochloric acid (HCl) and analyzed by ICP/OES according to the EN 71-part 3 method. DEHP, DINP, DEP, acetyl tributyl citrate were identified from wallpaper. Contents of DEHP, DINP were 0.2~11.3%, 17.9~27.8% respectively in 6 wallpapers, DEP and acetyl tributyl citrate were 1.5%, 8.9% respectively in one wallpaper. Plasticizers have changed from DEHP that has possibility of hazards to DINP, DEP and acetyl tributyl citrate as compared with 2002. Heavy metals were detected under guide line from all of the wallpapers except fire-retardant wallpaper contain antimony. While PVC wallpaper was improved by use of various plasticizer, functional wallpapers such as fire-resistant wallpaper contain high antimony in this study.
Preparation and identification of U(IV) for the investigation of behaviors of uranium in a disposal repository
Kim, Seung Soo ; Kang, Kwang Chul ; Kim, Jung Suck ; Jung, Euo Chang ; Baik, Min Hoon ;
Analytical Science and Technology, volume 21, issue 2, 2008, Pages 143~147
U(IV) ion, the valance state of uranium presumed at in a deep-depth disposal of a spent fuel, was prepared and separated from U(VI) ion. In order to prepare U(IV) ion, tests were performed by adding several reducing agents into a uranyl solution or by dissolution of uranium oxide in a mixed acid added with a reducing agent. The valance states of the uranium in the prepared solutions were identified by separating two ions with a Dowex AG 50W-X8 cation exchange resins and measuring the solutions using a laser-induced fluorescence spectroscopy. However, U(IV) and U(VI) were not separated by a Lichroprep Si60 exchange resin in the same separation condition of Pu(IV) and Pu(VI).
Development of a new lifetime prediction method for gas turbine core parts by digital image analysis of precipitates morphology
Chang, Moon Soo ; An, Seong Uk ;
Analytical Science and Technology, volume 21, issue 2, 2008, Pages 148~157
To describe the lifetime prediction of gas turbine core parts serviced in some ten thousands rpms at over
, the Larson-Miller Creep Curves, which are formed by creep rupture tests as the destructive experiment with parameters of stress and temperature, are used often, but not exact and reliable with errors of over some tens. On the other hand, this study shows a non-destructive method with increased accuracy and reliability. The SEM and TEM specimens were extracted by replica after polishing the local airfoil and root surfaces of the first stage scraped blade (bucket), serviced for 18,000 hours at
in Gas Turbines of Boryong. The observed TEM and SEM precipitates were digitalized for calculation of the average size. Here we could find the precipitate size grown from
during service and the grown precipitates to be still sound. From these results we could conclude that the scraped balde can be used for ten thous and hours additionally and for twenty thousand hours by additional heat treatments on the scraped blade.