• 한국식품영양과학회지
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• 제31권3호
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• pp.543-545
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• 2002

Solid phase microextraction(SPME)을 사용하여 김치 중의 향기성분이 매우 용이하게 포집할 수 있었으며 dimethyl-sulfide등 25종의 휘발성성분이 분석되었다. 질량분석기로 동정된 몇몇 성분을 AED로 확신하였을 때 황과 질소를 함유하는 성분임을 명확히 알 수 있어 GC-AED를 사용하면 그 물질의 구성원소를 쉽게 분석할 수 있다.

• Asian Pacific Journal of Cancer Prevention
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• 제13권6호
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• pp.2867-2871
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• 2012

Background: Multiple studies have reported associations between the PSCA rs2294008 C > T polymorphism and GC, but susceptibility has proven inconsistent. Therefore, we estimates the relationship between the rs2294008 C > T polymorphism and GC by meta-analysis. Methods: PubMed, Embase and Web of Science databases were searched and nine independent case-control studies were included in this meta-analysis. Crude ORs with 95% CIs were extracted according to the Mantal-Haenszel method and pooled to assess the strength of the association. Results: We observed that the PSCA rs2294008 C > T polymorphism was significantly correlated with GC risk when all studies were pooled into the meta-analysis. Further subgroup analysis showed the polymorphism to be linked with diffuse and noncardia GC in the allele contrast model, homozygote codominant model, dominant model, and recessive model. However, no connection was apparent for intestinal and cardia GC. In the stratified analysis by ethnicity, significant associations were observed in Asians for the recessive model. Interestingly, the relationship was particularly significant in the Chinese population. Conclusions: Our findings suggest that the PSCA rs2294008 C > T polymorphism is a risk factor for GC, especially in diffuse and noncardia GC and in Chinese.

• Journal of Microbiology and Biotechnology
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• 제16권7호
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• pp.1139-1143
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• 2006

Various techniques and strategies have been developed for the identification of intracellular metabolic conditions, and among them, isotope balance-based flux analysis with gas chromatography/mass spectrometry (GC/ MS) has recently become popular. Even though isotope balance-based flux analysis allows a more accurate estimation of intracellular fluxes, its application has been restricted to relatively small metabolic systems because of the limited number of measurable metabolites. In this paper, a strategy for incorporating isotope balance-based flux data obtained for a small network into metabolic flux analysis was examined as a feasible alternative allowing more accurate quantification of intracellular flux distribution in a large metabolic system. To impose GC/MS based data into a large metabolic network and obtain optimum flux distribution profile, data reconciliation procedure was applied. As a result, metabolic flux values of 308 intracellular reactions could be estimated from 29 GC/ MS based fluxes with higher accuracy.

• 약학회지
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• 제54권6호
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• pp.429-440
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• 2010

HS-SPME-GC/MS was studied and optimized for the determination of 17 orgarnophosphorous pesiticides (OPPs: chlorpyrifos, chlorpyrifos-methyl, demeton-s-methyl, diazinon, dimethoate, EPN, fenitrothion, fenthion, malathion, methidathion, monocrotophos, parathion, phenthoate, phosphamidon, sulfotep, terbufos, triazophos) in blood. Optimum SPME parameters were selected: choice of SPME fiber (85 ${\mu}m$ polyacrylate), pH effect (0.5 N HCl), salt effect ($Na_2SO_4$, 0.2 g; 20%), headspace incubation temperature ($80^{\circ}C$), headspace incubation time (1 min), headspace adsorption time (30 min) and GC desorption time (2 min). These parameters were optimized using HS-SPME autosampler coupled with gas chromatography-mass spectrometry (GC-MS). Method validation was carried out in terms of linearity, limit of detection (LOD), limit of quantitation (LOQ) and recovery in blood. The assay was linear over 0.5~5.0 mg/l ($r^2$=0.955~1.000). Limit of detection (LOD) and limit of quantitation (LOQ) in blood were determined 0.03~0.3 mg/l (S/N=3) and 0.1~1.1 mg/l (S/N=10), respectively. Relative recovery with 0.5, 1 and 5 mg/l (in blood) were 90.8%, 98.5% and 94.1%, respectively. This method will be applied to the determination of the orgarnophosphorous pesticides in postmortem blood. The proposed protocol can be an attractive alternative to be used in routine toxicological analysis.

• Journal of Gastric Cancer
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• 제20권2호
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• pp.127-138
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• 2020

Purpose: Mucin 1 (MUC1) was identified as a gastric cancer (GC) susceptibility gene by genome-wide association studies in Asians and candidate gene studies in Europeans. This study aimed to investigate the association between the MUC1 rs4072037 polymorphism and GC in terms of the Lauren classification and long-term clinical outcomes. Materials and Methods: A total of 803 patients with GC and 816 unrelated healthy controls were enrolled in the study. The association between the MUC1 rs4072037 variant and GC histological types and clinical outcomes, including tumor recurrence and prognosis was investigated. Results: The major A allele of rs4072037 was associated with increased GC risk (P<0.05). In subtype analysis, the association was most significant for diffuse-type GC (P<0.05) and in a dominant model (P<0.05), whereas there was no association with intestinal-type GC (P>0.05). Cox proportional hazards analysis revealed the heterozygote AG rs4072037 allele as an independent risk factor influencing tumor recurrence and disease-related death in diffusetype GC (P<0.05). but not in intestinal-type GC (P>0.05). Conclusions: The exonic single nucleotide polymorphism rs4072037 in MUC1 was associated with diffuse-type GC and was an independent risk factor influencing tumor recurrence and disease-related death in diffuse-type GC.

• 한국식품영양학회지
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• 제9권2호
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• pp.217-222
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• 1996

We studied about analyzing carbamate pesticides, organochlorine, organophosphorus pesticides simultaneously using by GC/MSD. For this, instead of HPLC which is generally used in analyzing carbamate pesticides, GC was used and all hydrogen of -NH group in carbamate pesticides were substituted for trifluoroacetyl group which is stable at heat And eight pesticide resdidues were not detected in nine samples circulated in the city.

• 대한환경공학회지
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• 제36권11호
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• pp.764-770
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• 2014

본 연구는 electron impact-gas chromatography/mass spectrometer (EI-GC/MS)를 이용하여 N-nitrosamines 분석하는 방법의 분리성, 정성 및 정량적 유효성을 평가하였다. 극미량의 검출을 위해 시료전처리는 자동고상추출과 질소농축과정을 거쳐 수행하였다. 표준시료를 전처리 없이 EI-GC/MS (SIM)와 EI-GC/MS/MS (MRM)를 이용하여 직접 분석한 결과, 두 방법 모두 유사한 감응도를 보였다. 반면, 전처리한 표준시료를 EI-GC/MS로 분석한 경우 불순물 피크에 의한 간섭영향에 의해 낮은 ng/L 수준의 정량은 어려운 것으로 나타났다. 8종의 N-nitrosamines에 대한 EI-GC/MS/MS 분석결과, 방법검출한계 및 정량한계는 각각 0.76~2.09 ng/L, 2.41~6.65 ng/L 수준으로 기존 분석방법에 비하여 낮게 나타났다. 첨가농도 10, 20, 100 ng/L에 대한 실험에서 정밀도(1.2~13.6%)와 정확도(80.4~121.8%) 모두 만족하였으며, 검량선의 직선성에 대한 결정계수($R^2$)도 0.999 이상이었다. 환경시료에 대한 대체표준물질(NDPA-$d_{14}$)의 회수율도 86.2~122.3%을 나타내어, 본 연구에서 평가된 방법으로 N-nitrosamines의 정밀분석이 가능함을 검증하였다.

• 대한수의학회지
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• 제44권1호
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• pp.29-40
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• 2004

Because cleaning products are part of our everyday lives, it is essential that they should not present significant risks to health. However, many petrochemicals in most soaps and detergents can be absorbed through the scalp and skin and, over time, accumulate in the organs and tissues. This accumulation may result in brain, nerve, and liver damage. Therefore, it is interested in developing non-harmful detergent. According to Korea Research Institute of Chemical Technology, GC-100X may be non-harmful and non-corrosive alkaline ionic water (pH 12). It is composed of hydroxyl radicals and supplemented with xylitol. To evaluate influence of GC-100X on rats and beagles, GC-100X was diluted with distilled water (25%, 50%, and 100% solution respectively). Each of diluted GC-100X was daily treated per oral. In body weight analysis, urinary analysis, ophthalmological test and autopsy, we did not find any significance, but in serum biochemical analysis and hematological analysis, we found some significances in middle dose group compared with control group. These significances in serum biochemical analysis and hematological analysis may be not induced by GC-100X, because it was not found to be significant from control group in histopathological examination. Thus, it is concluded that NOEL(No Observed Effect Level) of GC-100X may be higher than all treatment doses used in this study, and GC-100X may be a non-toxic detergent.

• 분석과학
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• 제28권3호
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• pp.221-227
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• 2015

아교는 불화, 단청, 나전의 접착제 등 문화재에서 접착제로 광범위하게 사용되어 온 전통재료 이다. 아교의 분석과 확인은 주로 IR 등의 분광학적인 방법으로 이루어져 왔으나, 아교의 성분을 확인하 는데 어려움이 있다. 열분해/GC/MS분석은 시료의 열분해 산물을 통해 시료의 성분을 추정할 수 있어 합성수지 등 고분자 재료의 성분을 분석하는데 유용하다. 본 연구에서는 아교의 화학 성분을 파악하기 위한 기초 단계로서 열분해/GC/MS분석을 시도하였다. 열분해 온도, 시료량, 반복성과 같은 분석 조건을 검토하여 적절한 분석이 가능한 조건을 찾았고, 이 조건에서 아교의 열분해 산물을 일부 규명하였다. 또한, 국내외에서 시판되는 젤라틴과 아교의 열분해 분석을 통해 아교와 젤라틴, 아교와 아교 사이에 제품에 따른 열분해 산물 차이가 없음을 확인하였다. 이로부터 문화재에서 아교의 사용 여부를 확인하기 위한 분석법의 제시와 아교를 젤라틴으로 대체하는데 필요한 화학성분상의 기초자료 확보가 가능하였다.

• 대한본초학회지
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• 제26권1호
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• pp.7-12
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• 2011

Objectives : The purpose of this study is to evaluate the quality of four different kinds of agarwood and analysis chemical constituents by GC-MS. Methods : Four source plants were two of Vietnamese agarwood, Indonesian agarwood and Myanmar agarwood. These plant materials were named sample No. 1-4. The chemical constituents of each agarwood were analysed by GC-MS. Results : GC-MS analysis showed that ${\beta}$-selinene was found in all the samples. The Vietnamese agarwood, Sample 1, and 4 has contained 6.861% and 7.497% of ${\beta}$-selinene and reached the highest level at the retention times 46.245 and 46.274 (min). Sample 2, the Myanmar agarwood has contained 1.608%, the lowest level of ${\beta}$-selinene, and it also has contained about 20% of ${\alpha}-,{\beta}-,{\gamma}$-eudesmol and 4.076% of valerianol. Sample 3, the Indonesian agarwood has contained 9.59% of ${\beta}$-selinene, 9.493% of ${\beta}$-selinene and shown its highest level (more than 19%) at the retention time 43.998 (min). Conclusion : It suggested that ${\beta}$-selinene could be a standard marker to evaluate agarwood by GC-MS analysis.