• Analytical Science and Technology
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• v.13 no.1
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• pp.72-80
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• 2000

The HS/GC/MS method was performed to analyze the volatile organic compounds in waste sludge samples. This study was performed to establish the fundamental data by studying the effects of salt, equilibrium temperature and time in the volatile organic compounds analysis. The presence of salts have been found to increase the sensitivity. The peak area is increased from 1.07 to 2.61 times by adding the salts to the water sample, compared with a salt tree sample. The recoveries of target compounds have found between 90% and 127% at sample temperature of $85^{\circ}C$ for 30 min. This HS/GC/MS method can be applied to analyze the volatile organic compounds and organohalo compounds in the environmental matrix.

• Analytical Science and Technology
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• v.26 no.3
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• pp.190-198
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• 2013

Ambers have been used mostly as beads, jewelry and ornaments from ancient times and excavated as a buried artifact. When excavated, they are severely weathered to be cracked, exfoliated and disintegrated. Monitoring of changes in composition of amber according to weathering is very important for diagnosing the condition of amber and applying conservation materials and techniques. In this study, we tried to find the components of amber by analyzing amber with pyrolysis/GC/MS. The changes in the composition of pyrolzates after artificial ageing for 60 days under heat and oxygen were also observed. Abietic acid was detected as a main component of fresh amber and monoterpene, alkene, aromatic hydrocarbon were detected as major pyrolyzates. Changes with artificial ageing was estimated by comparing the peak area ratio of 23 components, and it was found that abietic acid abruptly decreased in the presence of heat and oxygen together, revealing that oxygen is a key factor to the deterioration of amber. It was also tried to understand the weathered surface of original amber gemstone based on the result of this ageing experiment.

• Journal of Conservation Science
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• v.37 no.6
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• pp.638-647
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• 2021

Organic residues are substances derived from diverse natural sources. Recent scientific analysis of organic residues has yielded important information in restoring the lifestyles of ancient peoples. In this study, the organic material contained within the celadon oil bottle of the Goryeo dynasty, excavated from the Soejoul site in Geumneung-dong, Chungju, was analyzed using Fourier-transform infrared spectroscopy (FT-IR) and gas chromatograph-mass spectrometer (GC-MS). The results showed that the organic materials in the bottle were plant-derived oils. In particular, polyunsaturated fatty acids and phytosterols were detected using GC-MS analysis. Sesamin components were also identified. Sesamin, which is a characteristic component of sesame seeds, is a lignan and an antioxidant. As the organic residues in the oil bottle were derived from sesame seeds, it is presumed that sesame oil was stored in the bottle.

• Journal of Environmental Health Sciences
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• v.28 no.1
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• pp.67-77
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• 2002

This study was aimed to determine the urinary metabolite of IBP, one of the organophosphorus pesticides, as the biomarkers of exposure. Urine samples were collected for 24 hours in metabolic cages after oral administration and dermal application of IBP to rats. Identification of the derivatized urinary metabolite was determined by GC/MS and excretion time courses of the urinary metabolite was analyzed by GC/FPD. Urinary metabolite o IBP, diisopropyl phosphorothioate, was detected in rats urine both after oral administration and dermal application of IBP. Parent compound was not detected in the experiment. In GC/MS, the mass spectral confirmation for diisopropyl phosphorothioate ion was identified at m/z 254. Diisopropyl phosphorothioate was excreted within 48 hours and 72 hours after oral administration and dermal application of IBP, respectively. In this study, the same urinary metabolite of IBP was detected both in oral and dermal exposure. Generally, excretion of the urinary metabolite after oral administration was faster than after dermal application. It is suggested that urinary diisopropyl phosphorothioate could be used as the biomarkers of exposure to IBP.

• Asian Journal of Atmospheric Environment
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• v.6 no.1
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• pp.53-66
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• 2012

A comparison of analytical approaches for Levoglucosan ($C_6H_{10}O_5$, commonly formed from the pyrolysis of carbohydrates such as cellulose) and used for a molecular marker in biomass burning is made between the four different analytical systems. 1) Spectrothermography technique as the evaluation of thermograms of carbon using Elemental Carbon & Organic Carbon Analyzer, 2) mass spectrometry technique using Gas Chromatography/mass spectrometer (GC/MS), 3) Aerosol Mass Spectrometer (AMS) for the identification of the particle size distribution and chemical composition, and 4) two dimensional Gas Chromatography with Time of Flight mass spectrometry (GC${\times}$GC-TOFMS) for defining the signature of Levoglucosan in terms of chemical analytical process. First, a Spectrothermography, which is defined as the graphical representation of the carbon, can be measured as a function of temperature during the thermal separation process and spectrothermographic analysis. GC/MS can detect mass fragment ions of Levoglucosan characterized by its base peak at m/z 60, 73 in mass fragment-grams by methylation and m/z 217, 204 by trimethylsilylderivatives (TMS-derivatives). AMS can be used to analyze the base peak at m/z 60.021, 73.029 in mass fragment-grams with a multiple-peak Gaussian curve fit algorithm. In the analysis of TMS derivatives by GC${\times}$GC-TOFMS, it can detect m/z 73 as the base ion for the identification of Levoglucosan. It can also observe m/z 217 and 204 with existence of m/z 333. Although the ratios of m/z 217 and m/z 204 to the base ion (m/z 73) in the mass spectrum of GC${\times}$GC-TOFMS lower than those of GC/MS, Levoglucosan can be separated and characterized from D (-) +Ribose in the mixture of sugar compounds. At last, the environmental significance of Levoglucosan will be discussed with respect to the health effect to offer important opportunities for clinical and potential epidemiological research for reducing incidence of cardiovascular and respiratory diseases.

• Korean Journal of Food Science and Technology
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• v.37 no.3
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• pp.360-363
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• 2005

To detect falcarinol in Acanthopanax senticosus, its stem and bark were extracted with methanol fractionated with petroleum ether and diethyl ether, and separated by silica gel column chromatography, Resulting six crude samples were compared with standard falcarinol through TLC on silica gel plates. Fraction 6 showed $R_{f}$ value of 0.46 similar to that of standard falcarinol. Through analytical reverse phase HPLC/PDA, UV spectra of standard falcarinol and traction 6 recorded between 200 and 340 nm showed identical peaks and UV spectra patterns. GC/MS revealed standard falcarinol and fraction 6 have equal retention times of 7.4 and 8.5 min before and after TMS-derivatization, respectively. Standard falcarinol and fraction 6 showed more similar spectrum patterns after TMS-derivatization than before. These results confirm presence of falcarinol in A. senticosus.

• Journal of Acupuncture Research
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• v.28 no.2
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• pp.89-95
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• 2011

Objectives : The purpose of this study was to investigate the composition of Rehmannia glutinosa's essential oils with Rehmanniae Radix herbal acupuncture Methods : I obtained the essential oils of Rehmannia Radix by hydrodistillation extraction method and supercritical fluid extraction(SFE) method, and then I analyzed those by GC/MS(gas chromatography/mass spectrum). Results : 1. With GC(gas chromatography) and GC/MS(gas chromatography/mass spectrum) analysis. I identified 9 compounds in the Rehmanniae Radix's essential oil obtained through the SFE method. The main compounds were as follows : Hexachloroethane(2.24%), N-Butyl-benzenesulfonamide(2.05%), hexadecanoic acid(1.93%), hexadecanoic acid, ethyl ester(3.49%), 9,12-Octadecadienoic acid(z,z)(2.70%), (9E)-9-Octadecenoic acid(6.14%), ethyl linoleate(4.43%), ethyl oleate(5.80%). 2. I failed to get Rehmanniae Radix's essential oil obtained through the hydrodistillation method. 3. With GC(gas chromatography) and GC/MS(gas chromatography/mass spectrum) analysis. I identified 4 compounds in the Rehmanniae Radix's essential oil obtained through the hydrodistillation method. The main compounds were as follows : Ethylbis(trimethylsilyl)amine(1.04%), 2-(Trimethylsiloxy)benzoic methyl ester(2.65%), Hexadecanoic acid trimethylsilyl ester(12.61%), octadecanoic acid, trimethylsilyl ester(6.28%). Conclusions : The substances by hydrodistillation method may not perfectly match with the substances by supercritical fluid extraction(SFE) method in essential oils extracted form Rehmanniae Radix. But, the main substances was assumed Hexadecanoic acid and octadecanoic acid.

• Korean Journal of Pharmacognosy
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• v.39 no.1
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• pp.7-18
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• 2008

The chemical composition of the volatile constituents from the leaves, stems, and roots of Acanthopanax sessiliforus growing wild in Mt. Deok-Yu was determined by GC and GC-MS spectrometric analysis with the aid of NBS, Wiley Library and RI indice searches. The major constituents identified were ${\delta}-3-carene$ (7.24%), limonene (8.10%), ${\beta}-thujene$ (17.85%), trans-bicyclic hydrocarbon (13.35%) and ${\delta}-cadinene$ (4.28%) in the leaves from one year-grown plants, tricyclene (7.21%), ${\beta}-myrcene$ (7.62%), limonene (10.23%), ${\beta}-thujene$ (15.61%) and dihydroedulan I (6.12%) in the leaves from three years-grown plants, ${\delta}-3-carene$ (4.96%), limonene (5.93%), ${\beta}-phellandrene$ (17.31%) and naphthalene (7.79%) in the stems from one year-grown plants, ${\alpha}-pinene$ (5.21%), limonene (5.12%) and ${\beta}-phellandrene$ (9.82%) in the stems from three years-grown plants, ${\alpha}-pinene$ (12.73%), ${\beta}-pinene$ (11.16%), ${\delta}-3-carene$ (6.16%) and ${\gamma}-cadinene$ (23.39%) in the roots from one year-grown plants, and ${\alpha}-pinene$ (17.25%), ${\beta}-pinene$ (9.35%), ${\delta}-3-carene$ (7.26%) and ${\gamma}-cadinene$ (17.95%) in the roots from three years-grown plants.

• Korean Journal of Plant Resources
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• v.21 no.4
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• pp.237-248
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• 2008

The chemical composition of the volatile constituents from broad-leaved indeciduous trees was determined by GC and GC/MS spectrometric analysis with the aid of NBS, Wiley Library and RI indice searches. The major constituents were identified as hotrienol (9.21%) from Ligustrum japonicum flowers, undecane (32.12%) from Pittosporum tobira leaves, 1,8-cineole (45.32%) from Illicium religiosum leaves, ${\gamma}$-terpinene (15.62%) from Neolitsea aciculata leaves, 1,8-cineole (14.66%) from Cinnamomum japonicum leaves, 2-acetyl-5-methylfuran (54.51%) from Camellia sinensis leaves, and ${\gamma}$-elemene (18.59%) from Dendropanax morbifera leaves.

• Applied Biological Chemistry
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• v.35 no.5
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• pp.346-350
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• 1992

To investigate characteristic volatile components in Korean traditional soy sauce, this experiments were carried out. Whole volatile components were extracted by simultaneous steam distillation-extraction apparatus. The components of neutral fraction, emitting soy sauce-like odor, were fractionated from whole volatile components, and concentrated at atmosphere pressure, and then carried out GC-sniff evaluation and GC-fractionating collection by preparative gas chromatograph attached fraction collector APP-5. The GC-collected components were identified by GC/MS. The results were as follows; The component, emitting disagreeable odor, was identified as 3-methyl-1-butanol. The components, emitting soy sauce-like odor, were identified as dimethyl trisulfide, benzeneacetaldehyde, benzeneethanol.