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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 10, Issue 6 - 00 1997
Volume 10, Issue 5 - 00 1997
Volume 10, Issue 4 - 00 1997
Volume 10, Issue 3 - 00 1997
Volume 10, Issue 2 - 00 1997
Volume 10, Issue 1 - 00 1997
Selecting the target year
A Study on the Extraction Efficiency of Berberine in Coptidis Rhizoma
Rhee, Jae Seong ; Park, Ho Koon ; Woo, Eun Ran ; Lee, Eun Ju ; Ahn, Dug Kyun ; Youn, Won Sik ; Shin, Kwang Ho ;
Analytical Science and Technology, volume 10, issue 2, 1997, Pages 83~90
In this paper, optimum extraction condition for berberine which is the indan companent of Coptidis rhizoma was examined at various conditions in the aspect of temperature, solvent and time followed by quantitation with reversed phase HPLC. The efficiency for extraction has been shown the best at
with 2~3 hours reflux time in methanol or acetic acid. Any significant effect can not be shown from the addition of SLS to extraction solvent.
A Study on Qualitative and Quantitative Analysis of Major ingredients in Scutellariae radix
Rhee, Jae-Seong ; Woo, Eun Ran ; Kim, Nam-Hyuk ; Lee, Eun-Ju ; An, Duk-Kyun ; Lee, Je-Hyun ; Park, Seong Kyu ; Park, Ho-Koon ;
Analytical Science and Technology, volume 10, issue 2, 1997, Pages 91~104
Scutellariae radix has been used on the control of body fever as oriental medicine for thousand years. Analytical aspect for the main components of Scutellariae radix was set up improving sensitivity and resolution. The analysis of 3 different flavonoids present in Scutellariae radix-baicalin, baicalein, wogonin-was conducted by means of high performance liquid chromatography with ODS reverse phase column in conjunction with a Photo Diode Array UV detector(280nm) at
. Mobile phase was carried out at 1mL/min, composed of acetonitrile and 0.1M phosphoric acid in the form of a gradient method. Under these circumstances the retention time for baicalin, baicalein, wogonin was 7.65, 11.65 and 14.12 minutes respectively. As a result for the efficiency on extraction of active ingredients with proposed analytical process according to it's growing districts, Sunchang in Junbuk for baicalin and Bulkyo in, Junnam for bicalein and wogonin have shown the best results. Even the extraction at room temperature was satisfactory. Among acids, 0.1M acetic acid revealed the best achievements. The mixture of acetonitrile and 0.2M phosphoric acid(75:25) has been shown the best efficiency as well as stability for the extraction of active ingredients.
Depth profiles and the behavior of heavy metal atoms contained in the soil around a Il-Kwang disused mine in Kyung Nam
Jeong, Jong Hak ; Song, Hyun Jung ; Jeong, Gi Ho ;
Analytical Science and Technology, volume 10, issue 2, 1997, Pages 105~113
We investigated the content of heavy metals contained in the soil at an Il-Kwang disused mine in Kyung Nam. Three sampling points were selected, each point was digged to 210 or 240cm, sampled each 30cm depth. After air drying, each sample was digested in aqua regia and then analyzed with an Inductively Coupled Plasma Atomic Emission Spectrometer. We determined the content of Zn, Pb, Cr, Cd, Cu, Mn, and Fe, maximum content of Pb, Cd, and Zn was observed to
respectively. Mean pH values of soil sampled at No.1, 2, and 3 regions were 3.2, 2.6, and 2.8, respectively. These values are remarkably lower than pH of the conventional standard soil which usually shows pH level around 4.9. At each sampling point, maximum content of heavy metals was observed from 30cm to 60cm depth. The depth profiles of Zn, Cd, Pb, and Cr showed very similar tendencies to each other, but those of Fe, Cu. and Mn showed different tendencies to former ones.
Stripping Voltammetric Determination of Osmium
Kwon, Young-Soon ; Kim, So-Jin ; Czae, Myung-Zoon ;
Analytical Science and Technology, volume 10, issue 2, 1997, Pages 114~118
A stripping voltammetric scheme for the determination of osmium, based on the adsorptive accumulation of osmium in the presence of hydroxylamine, was described. Cyclic voltammetry was used to characterize the redox and interfacial processes. Optimal experimental conditions were found to be a stirred 0.05M hydroxylamine hydrochloride solution(pH 1.8), accumulation at -0.65V for 60s, and a differential pulse mode with a scan rate of 10mV/s. The detection limit was
(12ppb) with the optimal condition.
Adsorptive Stripping Voltammetric Determination of Ruthenium
Hong, Tae-Kee ; Kwon, Young-Soon ; Czae, Myung-Zoon ;
Analytical Science and Technology, volume 10, issue 2, 1997, Pages 119~125
A stripping voltammetric procedure for determining ruthenium was developed, based on the adsorptive accumulation of ruthenium in the presence of hydrazine in acidic acetate buffer. After preconcentration of ruthenium compelex and reduction, the ruthenium-catalyzed hydrogen current at -0.84V was measured by differential pulse voltammetry. Optimal experimental conditions were found to be a stirred acetate buffer solution(pH 2.0) containing 0.01M acetate and 0.01M hydrazine, accumulation potential of -0.76V, and a scan rate of 5mV/s. The detection limit was
for a 7 min accumulation period. The possible interferences by other platinum group metals were also investigated.
Electrochemical Behavior of Bis(2,2'-Bipyridyl) Copper(II)-Sodium Dodecyl Sulfate Solution in the Presence of
Ko, Young Chun ; Chung, Keun Ho ;
Analytical Science and Technology, volume 10, issue 2, 1997, Pages 126~130
Electrochemical behavior of 1.0mM bis(2,2'-bipyridyl)copper( II )(
) in 100mM NaCl+27mM
solution with and without sodium dodecyl sulfate(SDS) is investigated. In the presence of SDS,
shifts to the positive direction compared to the SDS free. Teh intersection of two lines on
vs. -log[SDS] plot for 1.0mM
in 100mM NaCl+27mM
solution is a critical micelle concentration(CMC). Reduced form
in the presence of
is more easily associated to dodecyl sulfate anion(
) than oxidized
. As the ionic strength is increased by the addition of multiply charged cations(
), the double layer becomes more compact and micelle formation is more difficult.
Development of New Analytical Method of Vitamins Using Supercritical Fluid
Pyo, Dongjin ; Park, Dongjin ; Kim, Hohyun ; Lee, Hakju ; Lee, Taejoon ;
Analytical Science and Technology, volume 10, issue 2, 1997, Pages 131~138
Supercritical Fluid Chromatography(SFC) has become a technique for solving problems that are difficult to be monitored by other chromatographic methods. However, the most widely used fluid, is no more polar than hexane. Polar samples which are difficult to be analyzed with pure supercritical
because of their high polarity can be separated by adding polar modifiers to supercritical
. In this paper, a new method for monitoring the mobile phase composition in modified supercritical fluid chromatography was developed. The amount of water dissolved in supercritical
was measured by amperometric microsensor which is made of thin film of perfluorosulfonate ionomer(PFSI). The amount of water dissolved in supercritical
stayed constant for a much longer time than with a saturator column. With this new mixing device, we could get good resolutions for vitamins which are difficult to separate with pure
Spectroscopic Analysis of Alkylbenzenes as Synthetic Lubricant Base Oils
Choi, Ju-Hwan ; Jeong, Hyuk ; Kim, Hai-Dong ;
Analytical Science and Technology, volume 10, issue 2, 1997, Pages 139~145
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
-NMR, near-infrared, and UV-Vis spectroscopy. Also, linear long chain alkylated benzene in the engine lubricants was analyzed quantitatively by infrared spectroscopy.
Development and Evaluation of a Rapid BOD Measurement System
Oh, Hyuk ; Choi, Don-Soo ; Jeong, Hyuk ; Choi, Ju-Hwan ; Kim, Hai-Dong ;
Analytical Science and Technology, volume 10, issue 2, 1997, Pages 146~152
A rapid BOD measurement system using a microbial membrane electrode has been developed. Culture of microorganism and the preparation of microbial membrane, the effect of sample flow rate on the BOD measurement, the effect of solution pH and response characteristics of the microbial membrane electrode were investigated. The rapid BOD measurement system developed by us was connected to a personal computer and the whole BOD measurement procedures were carried out automatically. The best results were obtained when the solution flow rate was 7.8mL/min and the data were obtained 5 minutes after sample injection.
Separation and Activity Test of Antifungal Substance from C. japonica Extract
Chung, Ill-Min ; Paik, Su-Bong ;
Analytical Science and Technology, volume 10, issue 2, 1997, Pages 153~159
This study was conducted to test antifungal activity and to separate bioactive compound using C. japonica extract which was shown the most effective control on the B. berengeriana, G. cingulata and P. expansum.
on the test pathogene of C. japonica extract was
. Bioactive compound analyzed by TLC and HPLC method was identified as a kind of alkaloids, berberine, and the content was 81.14%.