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Purge & Trap, GC/MSD를 이용한 해수 중 휘발성유기화학물질 분석
김유곤,백병천,이원준 國立 麗水大學校 環境問題硏究所 2002 環境硏究論文集 Vol.5 No.-
Analysis items of this study were 1,1-dichloroethene, dichloromethane, chloroform, 1,2-dichloroethane, 1,1,1-trichloroethane, benzene, carbontertrachloride, toluene, ethylbenz ene, m,p-xylene, styrene, o-xylene. Equipment of analysis was purge & Trap/HP-6890GC/5973MSD, GC operating condition was carrier gas 99.999% Helium-0.7㎖/min, Trap meterial Tenax/SG?Charcoal, Column HP-PONA(Crosslinked Methyl Siloxane, 50m×0.2mm×0.5㎛), Oven program 35℃(10min)-4℃/min 150℃-1 5℃/min 200℃(5min), Aux 280℃, MS Source 230℃, MS Quad 150℃ Result of RSD% measurement was chloroform 9.37%, 1,2-dichloroethane 5.79%, 1,1,1-trich loroethane 12.56%, benzene 4.31%, carbon tetrachloride 15.35%, toluene 3.89%, ethylben zene 5.69%, m,p-xylene 5.65, styrene 4.02%, o-xylene 2.94%. Result of analysis showed that 1,1,1-trichloroethane, carbontetrachloride, dichloromethane were not detected, 1,1-dichloethane was detected level of 0.19ppb, 0.26ppb in 1st sampling point 6, 7, 1,2-dichloromethane 0~7.25ppb, benzene 0~0.9ppb, toluene 0/11~1/79ppb, ethyelbenzne 0~2.15ppb, m,p-xylene 0~2.32ppb, styrene 0~0.8ppb, o-xylene 0~0.68ppb.
김유곤,김달호,백병천,이우범 國立 麗水大學校 환경문제硏究所 2001 環境硏究論文集 Vol.4 No.-
The CRM used in evaluation of effectiveness, calibration or analysis equipment when you analyse in material of rice powder or similar matrix. Analytical items were γ-HCH, p,p'-DDE, endosulfan-2, samples of achieved pertreatment analized each component indivisually. Control mode of MS used selected ion monitering(SIM). GC is 6890GC of Agilent Technology company and MS is JMS 700 of Jeol company. MS operating condition was Electron impact ionization with 70eV. 300A, GC operating condition was Column : Rtx-5MS 30m*0.25m ID*0.25um, Oven Temp 90℃(3min)-20℃/min-280℃(2min), Injection port 250℃, splitless, Carrier Gas He with 1mL/min. Water contents was 12.534% and dry mass correction factor 1.143. CRM certified values of the experiment result were p,p'-DDE 0.165±0.011,mg/kg, γ-HCH 0.0129±0.0011mg/kg, endosulfan-2 0.0216±0.0027mg/kg. The numbers following the symbol ± are the numerical values of expanded uncertainties, U=ku_(c) of measurement values preceding the symbol. The level of confidence for the expanded uncertainties are 96% with k=2.
Kim, Yoon-Woo,Sung, Changmin,Lee, Seulee,Kim, Kyoung-Jin,Yang, Yung-Hun,Kim, Byung-Gee,Lee, Yoo Kyung,Ryu, Hee Wook,Kim, Yun-Gon American Chemical Society 2015 ANALYTICAL CHEMISTRY - Vol.87 No.2
<P><I>N</I>-Acyl homoserine lactones (AHLs), quorum sensing molecules produced by Gram-negative bacteria, are used as important secondary metabolites for antibacterial drug development and cell-to-cell communication. Although various analytical techniques have been developed for detection and quantitation of AHLs from more complex bacterial culture media, only a few methods have been applied to AHL identification in physiological samples. Here, we developed a highly sensitive and reliable MALDI-based 3-oxo AHL quantitation method by employing Girard’s reagent T (GT) to produce a permanent cationic charge state [M]<SUP>+</SUP> at the ketone group of AHLs. After extracting AHLs from the supernatant of bacterial cultures using ethyl acetate, the extracts were subsequently derivatized with GT without any additional purification or desalting steps. The chemical derivatization of 3-oxo AHLs dramatically enhanced sensitivity (up to 60 000 times) by lowering the limit of detection (LOD, ∼0.5 fmol)/limit of quantitation (LOQ, ∼2.5 fmol). Additionally, the GT-derivatized 3-oxo AHLs allowed more accurate quantitative analysis from the <I>Pseudomonas aeruginosa</I> PAO1 culture supernatants. This method may be applied for developing high-throughput and sensitive detection methods of quorum sensing signal molecules in biofilm-related clinical applications such as virulence factor characterization and antibacterial drug development.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancham/2015/ancham.2015.87.issue-2/ac5039362/production/images/medium/ac-2014-039362_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ac5039362'>ACS Electronic Supporting Info</A></P>
Yoo, Hye Jin,Kim, Sungeun,Park, Man Sik,Yang, Sae Jeong,Kim, Tae Nyun,Seo, Ji A,Kim, Sin Gon,Kim, Nan Hee,Seo, Hong Seog,Baik, Sei Hyun,Choi, Dong Seop,Choi, Kyung Mook Society of Nuclear Medicine 2011 The Journal of nuclear medicine Vol.52 No.1
<P>We examined the severity of vascular inflammation in healthy individuals without hyperlipidemia but with elevated high-sensitivity C-reactive protein (hsCRP) using (18)F-FDG PET, which is a promising imaging technique for the assessment of vascular inflammation within atherosclerotic plaques. Methods: Vascular inflammation in the carotid arterial wall, represented as the target-to-background ratio (TBR), was measured using (18)F-FDG PET in 120 healthy subjects without a history of cardiovascular diseases. RESULTS: Subjects with high hsCRP (?? mg/L) and low low-density lipoprotein cholesterol (LDL-C) (<130 mg/dL) levels had a significantly higher maximum TBR than did those with low hsCRP (<2 mg/L) and low LDL-C levels (<130 mg/dL) or low hsCRP (<2 mg/L) and high LDL-C levels (??30 mg/dL) (1.29 ± 0.13, 1.12 ± 0.10, and 1.16 ± 0.05, respectively), even though there were no significant differences in the carotid intima-media thickness. The maximum TBR values had the strongest positive correlation with hsCRP level among the various cardiovascular risk factors (r = 0.68, P < 0.01). However, other emerging inflammatory markers such as lipoprotein-associated phospholipase A(2) or monocyte chemoattractant protein-1 were not coherently associated with TBR values. Multiple stepwise regression analyses showed that hsCRP and diastolic blood pressure were independent decisive factors for maximum TBR, whereas age, diastolic blood pressure, and LDL-C were factors that determined the maximum intima-media thickness. CONCLUSION: Vascular inflammation measured using (18)F-FDG PET was increased in healthy individuals without hyperlipidemia but with elevated hsCRP.</P>
Kim, Tae Nyun,Park, Man Sik,Yang, Sae Jeong,Yoo, Hye Jin,Kang, Hyun Joo,Song, Wook,Seo, Ji A.,Kim, Sin Gon,Kim, Nan Hee,Baik, Sei Hyun,Choi, Dong Seop,Choi, Kyung Mook American Diabetes Association 2010 Diabetes care Vol.33 No.7
<P><B>OBJECTIVE</B></P><P>We examined prevalence of sarcopenia in Korean patients with type 2 diabetes and compared body compositional parameters between subjects with and without type 2 diabetes.</P><P><B>RESEARCH DESIGN AND METHODS</B></P><P>The Korean Sarcopenic Obesity Study (KSOS) included 810 subjects (414 patients with diabetes and 396 control subjects) who were examined using dual-energy X-ray absorptiometry. Prevalence of sarcopenia was defined using the skeletal muscle index (SMI).</P><P><B>RESULTS</B></P><P>Prevalence in patients with diabetes and in the control group was 15.7 and 6.9%, respectively. In both men and women, SMI values were significantly decreased in patients with diabetes compared with subjects without diabetes. Furthermore, multiple logistic regression analysis showed that type 2 diabetes was independently associated with sarcopenia.</P><P><B>CONCLUSIONS</B></P><P>Type 2 diabetes was associated with increased risk of sarcopenia. These characteristics may contribute to physical disability and metabolic disorders in older adults with diabetes.</P>
Body size phenotypes and low muscle mass: the Korean sarcopenic obesity study (KSOS).
Kim, Tae Nyun,Park, Man Sik,Yang, Sae Jeong,Yoo, Hye Jin,Kang, Hyun Joo,Song, Wook,Seo, Ji A,Kim, Sin Gon,Kim, Nan Hee,Baik, Sei Hyun,Choi, Dong Seop,Choi, Kyung Mook Issued for the Endocrine Society by the Williams W 2013 The Journal of clinical endocrinology & metabolism Vol.98 No.2
<P>Unique subsets of body size phenotypes seem to be more prone or more resistant to the development of obesity-associated metabolic disorders, although the underlying mechanism is not yet clearly understood.</P>