• 한국연초학회지
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• 제11권2호
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• pp.225-232
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• 1989

Deoxyschizandrin, gomisin N, schizandrin, wuweizisu C, gomisin A and angeloylgomisin H were isolated from fruits of Schisandra chinensis BAILLON, and the lignan contents in shred and smoke of 'Balloon-Flower' cigarettes were quantitatively analyzed by capillary-GC(FID). The GC column was SPB-1 fused silica capillay (0.25mm id$\times$30m, Supelco) and the column oven temperature was programmed from 20$0^{\circ}C$ to 30$0^{\circ}C$ at the rate of 4$^{\circ}C$/min. In the shred of 'Balloon-Flower' cigarettes deoxyschizandrin. gomisin N, schizandrin, gomisin A and angeloylgomisin H were detected and schizandrein contets were the highest among them, 22.77$\mu\textrm{g}$/cig., gomisin N, schizandrin and gomisin A were 0.023, 0.054, 0.0849 and 0.167$\mu\textrm{g}$/cig. respectively, and angeloylgomisin H was not detected.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2017년도 공동학술발표회
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• pp.235-235
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• 2017

• 한국대기환경학회지
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• 제22권5호
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• pp.712-718
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• 2006

In order to investigate the analytical uncertainties associated with sampling and analysis of major greenhouse gaseous pollutants(carbon dioxide and methane), we attempted to quantify their adsorptive loss due to the contact with the container wall(such as Tedlar bag and vial). Using the GC/FID method, some basic experimental parameters(such as reproducibility and method detection limit) have been evaluated as part of the essential QA/QC The reproducibilities of carbon dioxide and methane were estimated as 2.02 and 0.2%, respectively. In addition, method detection limits were measured as 0.61 and 0.06 ng, respectively. A test of sample loss rate has also been made for Tedlar bag and vial by assessing the absolute amount of sample loss on the wall. By transferring the samples contained in Tedlar bag to various sizes of Tedlar bags, we measured differences in the absolute loss quantity due to such transfer. In addition, we also examined such loss mechanism as a function of elapsed time and light penetration rate for vial. As results, carbon dioxide and methane have shown about 2% of sample loss due to such contact. It is also noticed that the amount of loss with vial surface is lower than that of Tedlar bag. Therefore, field collection of greenhouse gases using various container types should be made more cautiously to minimize the possibility of sample loss and bias related to such loss.

• 분석과학
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• 제33권2호
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• pp.98-107
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• 2020

Methamphetamine (MA) is currently the most abused illicit drug in Korea. MA is produced by chemical synthesis, and the final target drug that is produced contains small amounts of the precursor chemicals, intermediates, and by-products. To identify and quantify these trace compounds in MA seizures, a practical and feasible approach for conducting chromatographic fingerprinting with a suite of traditional chemometric methods and recently introduced machine learning approaches was examined. This was achieved using gas chromatography (GC) coupled with a flame ionization detector (FID) and mass spectrometry (MS). Following appropriate examination of all the peaks in 71 samples, 166 impurities were selected as the characteristic components. Unsupervised (principal component analysis (PCA), hierarchical cluster analysis (HCA), and K-means clustering) and supervised (partial least squares-discriminant analysis (PLS-DA), orthogonal partial least squares-discriminant analysis (OPLS-DA), support vector machines (SVM), and deep neural network (DNN) with Keras) chemometric techniques were employed for classifying the 71 MA seizures. The results of the PCA, HCA, K-means clustering, PLS-DA, OPLS-DA, SVM, and DNN methods for quality evaluation were in good agreement. However, the tested MA seizures possessed distinct features, such as chirality, cutting agents, and boiling points. The study indicated that the established qualitative and semi-quantitative methods will be practical and useful analytical tools for characterizing trace compounds in illicit MA seizures. Moreover, they will provide a statistical basis for identifying the synthesis route, sources of supply, trafficking routes, and connections between seizures, which will support drug law enforcement agencies in their effort to eliminate organized MA crime.

• 한국토양환경학회지
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• 제3권1호
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• pp.3-9
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• 1998

본 연구는 휘발성 유기 화합물로 오염된 가솔린 지역에서 soil-gas의 분석결과로부터 오염도를 유추하는 기법에 대하여 서술 하였다. Soil-gas의 채취방법으로는 펌프를 이용한 1)grab sampling법과 흡착제 trap을 사용한 2)passive sampling법이 있다. Grab sampling법은 특정시간에 특정장소에서의 오염도를 보여주며, 반면에 passive sampling법은 특정위치에서 시간에 따른 오염도의 변화를 보여 준다. Soil-gas의 분석은 1)PID나 FID와 같은 작은 검지기에 의해서 총괄 탄화수소량을 측정할수도 있고 2)기체농도에 따라서 색깔이 변하는 지시약이 채워진 기체검지기 튜브를 사용할수도 있으며 3)여러가지 화합물을 한 번에 분석할수 있는 이동형 GC를 사용할수도 있다. Soil-gas를 이용한 측정법은 매우 값싸며 세밀한 정밀조사를 하기 위한 전단계에서 사용할 수 있는 유용한 방법으로 추천할만하다 하겠다.

• 분석과학
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• 제21권1호
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• pp.14-19
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• 2008

많은 악취물질 중에 알데하이드는 인간의 호흡기 자극을 유발할 뿐만 아니라 인간의 건강에 상당히 안좋은 영향을 미친다. 알데하이드류의 악취물질은 일반 대기오염물질과 달리 ppt 수준의 매우 극미량에서 악취를 발생하는 성분이 많아 매우 극미량의 측정기술의 필요하다. 또한 대부분 반응성이 크고 안정성이 낮아 표준가스 제조 및 분석이 매우 어려워 정확한 측정이 어렵다. $10{\mu}mol/mol$ 수준의 농도로 제조된 4성분 알데하이드 CRM(MK0731)은 ISO 6142에 의한 중량법으로 제조하였다. $10{\mu}mol/mol$ 알데하이드 표준가스 실린더를 반복 제조하여 각각 GC-FID로 제조의 균질성을 조사하였고, 개발된 알데하이드류 CRM 인증값의 상대 확장불확도는 2.11 %(95%의 신뢰수준, k=2)로 조사되었다.

• 분석과학
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• 제21권2호
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• pp.135-142
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• 2008

2005년 이후 국내에서 생산된 벽지 중의 가소제와 중금속 함량의 실태와 변화를 파악하기 위해 2002년도에 생산된 벽지와 비교하였다. 벽지의 가소제는 KSM1991 방법에 따라 n-hexane을 용매로 속실렛 추출하여 GC/FID로 분석하였다. 중금속은 EN 71-part 3 방법에 따라 0.07 mol/L 염산으로 전처리하여 ICP/OES로 분석하였다. 가소제는 DEHP, DINP, DEP, acetyl tributyl citrate가 검출되었다. DEHP는 6개 벽지에서 0.2~11.3%로 사용되고 있었고, DINP는 6개 벽지에서 17.9~27.8%, DEP는 한 개 벽지에서 1.5%, acetyl tributyl citrate도 한 개 벽지에서 8.9%로 나타났다. 2002년 PVC 벽지와 비교하면 가소제는 위해성 논란에 있는 DEHP에서 DINP와 DEP, acetyl tributyl citrate로 바뀌고 있는 것으로 확인되었다. 중금속은 방염벽지에서 안티몬이 환경마크의 기준값 이상이었던 것 외에는 모든 벽지에서 기준치 이하로 검출되었다. 이와 같이 PVC 벽지는 다양한 가소제의 사용으로 개선되고 있지만, 방염벽지와 같은 일부 기능성 벽지는 안티몬의 함량이 높은 것으로 조사되었다.

• 대한화학회지
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• 제55권2호
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• pp.157-162
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• 2011

대기 중 휘발성 유기화합물을 포함한 기체 성분을 현장에서 실시간으로 검출할 수 있는 소형 GC 모듈을 개발하였다. 상용의 모세관 또는 충진 컬럼을 열선과 함께 다발 형태로 감아 소형 케이스에 내장 하였고 소형 경량의 센서, 밸브, 펌프, 그리고 재충전이 가능한 운반기체 캐니스터 등을 사용하여 분석 시료의 채취, 주입, 및 분리 및 검출이 10 분 이내에 이루어지도록 하였다. 다양한 기체 혼합물을 소형 GC 모듈과 불꽃이온화 및 열전도도 검출기로 측정한 결과 모세관 컬럼의 경우 R=8.3의 분해능을 나타냈으며 우수한 감도는 물론 재현성 및 직진성을 나타내었다. 따라서 소형 GC 모듈은 대기 중 휘발성 유해물질의 농도 감시, 화학 공정 및 오염 배출원 규제 등에 매우 효과적으로 활용되리라 기대된다.

• Journal of Applied Biological Chemistry
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• 제57권3호
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• pp.211-218
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• 2014

Polymethoxyflavones (PMFs) are a group of polymethoxylated bioactive flavones with diverse biological activities, including anticancer, anti-inflammatory, antibacterial, and antiviral activities. PMFs are found from various plants such as orange, tangerine, and krachaidum. To establish the simple quantitative analytical methods for PMFs, chromatographic analysis was applied to the selected krachaidum foods because krachaidum contains diverse PMFs compared to other PMF-containing foods. Krachaidum is the rhizome of Kaempferia parviflora, and many commercial krachaidum products, such as tea, juice and wine, are commercially available and consumed as health functional foods in Asian countries. Apart from the claimed health promoting benefits, reliable quality assurance and legal guideline for the registration of these products are not available yet. Twelve PMFs were analyzed from the commercial krachaidum foods by GC-FID and HPLC-DAD. No single chromatographic method could not analyze 12 PMFs simultaneously. HPLC-DAD method was found more sensitive to detect PMFs. Based on our analysis data, we proposed 5,7-dimethoxyflaone and 5,7,4'-trimethoxyflavone as index components for the food products.

• 한국환경농학회지
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• 제27권3호
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• pp.279-284
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• 2008

We investigated whether carboxylate exudation of Brassica pekinensis Rupr. was affected by nitrate deposition from simulated acid rain. A gas chromatographic (GC) analysis was employed for the determination of low molecular weight organic acids (LOA) in rhizosphere soils, bulk soil, roots and leaves of Brassica pekinensis Rupr.. Rhizosphere soils were collected after 8 weeks of plant growth by first removing the bulk soil from the root system and then by mechanical move off the rhizosphere soil that adhered to the root surface with soft brush. Soil and plant materials were simultaneously extracted with the mixture of methanol and sulfuric acid (100:7, v/v). Seven organic acids, oxalic, malonic, fumaric, succinic, maleic, L-malic and citric acid were identified and quantified by GC equipped with FID. Oxalic, L-malic, and citric acids were found in both the bulk and rhizosphere soils, while most LOAs were not detected in the control treatment. On the contrary, except maleic acid, all other organic acids were detected in the leaves and roots of cabbages treated with nitrate deposition.