• Title, Summary, Keyword: gas chromatography-mass spectrometry

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Analysis of Antioxidants in Fatty Foods Using Gas Chromatography/Mass Spectrometry (식품 중 Gas Chromatography/Mass Spectrometry를 이용한 산화방지제의 분석에 관한 연구)

  • 이정애;노동석
    • Journal of Food Hygiene and Safety
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    • v.12 no.3
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    • pp.210-216
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    • 1997
  • The prevention of oxidative degradation in fats and oils is largely controlled by the use of synthetic phenolic antioxidants. Antioxidants, BHA: 2-&-3-tert-butyl-4-hydroxyanisol, BHT: 3,5-di-tert-butyl-4-hydroxytoluene, TBHQ: tert-butylhydroquinone, PG: propyl gallate, PTG: pentyl gallate, OG:octyl gallate, were extracted from fatty foods with hexane and from hexane layer to presaturated acetonitrile with hexane. The polar phenolic hydroxyl groups of antioxidants were silylated with MSTFA and injected to Gas Chromatography/Mass Spectrometry. The calibration plots were linear in the investigated range, 0.1~10.0 $\mu\textrm{g}$/g. The limit of detection for 6 phenolic antioxidants was 0.1 $\mu\textrm{g}$/g. Recoveries and reproducibilities from samples fortified at 1.0 $\mu\textrm{g}$/g were in the range of 70~90% and 0.5~13%, respectively. The simultaneous determination of phenolic antioxidants in fatty foods using GC/MS-SIM mode and macro program was described.

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The Study on the Composition in Pharmacopunctures of Eight Principles by Gas Chromatography/Mass Spectrometry (Gas Chromatography/Mass Spectrometry를 이용한 팔강약침액 성분에 대한 연구)

  • Kim, Hyub;Ahn, Byung-Soo
    • Journal of Pharmacopuncture
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    • v.11 no.3
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    • pp.79-91
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    • 2008
  • Objective: The purpose of this study was to investigate the composition for pharmacopunctures of eight principles hydrodistillation layer. Methods: The study was determined the hydrodistillation layer for pharmacopunctures of eight principles by hydrodistillation method. The effective components in hydrodistillation layer for pharmacopunctures of eight principles were extracted with ethyl ether or dichloromethane, and then analyzed by Gas Chromatography/Mass Spectrometry(GC/MS). Results: 1. Analyzed pharmacopunctures of eight principles by GC/MS, a lot of differences according to extraction solvent by each pharmacopunctures of eight principles and specific peak patterns were seen. 2. The main compound in pharmacopunctures of eight principles was a kind of hexaoxacyclohydrocarbon that has long hydrocarbon chain.

Determination of total iodide in seawater by gas chromatography-mass spectrometry (Gas chromatography-mass spectrometry를 이용한 해수 중 총 요오드 정량분석)

  • Shin, Ueon-Sang
    • Analytical Science and Technology
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    • v.15 no.5
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    • pp.445-450
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    • 2002
  • A sensitive gas chromatographic method has been established for the determination of total iodide in seawater as their volatile organic derivative. The method is based on the formation of 4-iodo-2,6-dimethylphenol with 2,6-dimethylphenol in matrix and a single-step extraction of the derivative with ethyl ether, which are then measured by gas chromatography-mass spectrometry (selected ion monitoring). Iodate in sea water was completely reduced to iodide with ascorbic acid and acetic acid. The detection limit was 0.1 ng/mL in seawater and the calibration curve showed good linearity with r=0.9997. The method was sensitive, reproducible and simple enough to permit the reliable routine analysis of total iodide in seawater. Total iodide in sea water was found about 30 ng/ml.

Direct Analysis of Tackifying Resins in Vulcanized Rubber by Simultaneous Pyrosis Methylation-Gas Chromatography/Mass Spectrometry

  • 김승욱;허귀숙;이계호
    • Bulletin of the Korean Chemical Society
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    • v.19 no.2
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    • pp.164-169
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    • 1998
  • Vulcanized rubber containing three kinds of oligomeric resins such as cashew resin, t-octylphenol formaldehyde resin and terpene modified wood rosin has been characterized by simultaneous pyrolysis methylation-gas chromatography/mass spectrometry (SPM-GC/MS). After methylation by the SPM method using tetramethylammonium hydroxide, the methylated pyrolyzates of the corresponding resins were detected with higher sensitivity than underivatized pyrolyzates without any interferences from other ingredients of vulcanized rubber.

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Identification of Higenamine nad its Metabolites in Rat by Gas Chromatography/Mass Spectrometry

  • Ryu, Jae-chun;Song, Yun-Seon;Kim, Myung-Soo;Cho, Jung-Hyuck;Yunchoi, Hye-Sook
    • Archives of Pharmacal Research
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    • v.16 no.3
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    • pp.213-218
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    • 1993
  • ($\pm$)-Higenamine is known as a cardiotonic principle of aconite root (root of Aconitum spp., Ranunculaceae). A simple and sensitive detection method for higenamine was developed by using gas chromatography-mass spectrometry (GC/MS). The recovery of higenamine after extraction and concentration with XAD-2 resin column was around 95% from rat biological fluids such as bile, plasma and urine. The limits of detection of higenamine in these biological fluids were approximately 0.1 ng/ml each. It has well been suggested that tetrahydroisoquinolines possessing catechol moiety such as higenamine should be subjected to the catechol-O-methyl transferase (COMT) activity in vivo. We detected two major peaks of presumed metabolites of higenamine in the total ion chromatogram obtained from the rat urine sample after the oral adminstration of ($\pm$)-higenamine. The scan mass spectrum of one of the metabolties coincided with those obtained from coclaurine $(C_6$-O-methyl higenamine) and those of the other metabolite are suggestive of isococlaurine $(C_7$-O-methyl higenamine).

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Gas Chromatography-High Resolution Tandem Mass Spectrometry Using a GC-APPI-LIT Orbitrap for Complex Volatile Compounds Analysis

  • Lee, Young-Jin;Smith, Erica A.;Jun, Ji-Hyun
    • Mass Spectrometry Letters
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    • v.3 no.2
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    • pp.29-38
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    • 2012
  • A new approach of volatile compounds analysis is proposed using a linear ion trap Orbitrap mass spectrometer coupled with gas chromatography through an atmospheric pressure photoionization interface. In the proposed GC-HRMS/MS approach, direct chemical composition analysis is made for the precursor ions in high resolution MS spectra and the structural identifications were made through the database search of high quality MS/MS spectra. Successful analysis of a complex perfume sample was demonstrated and compared with GC-EI-Q and GC-EI-TOF. The current approach is complementary to conventional GC-EI-MS analysis and can identify low abundance co-eluting compounds. Toluene co-sprayed as a dopant through API probe significantly enhanced ionization of certain compounds and reduced oxidation during the ionization.

Analysis of Benzophenone in Sediment and Soil by Gas Chromatography/Mass Spectrometry (기체크로마토그래피/질량분석기에 의한 저질 및 토양시료 중 벤조페논의 분석법 연구)

  • 권오승;김은영;류재천
    • Environmental Analysis Health and Toxicology
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    • v.16 no.3
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    • pp.121-126
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    • 2001
  • Analytical method of benzophenone (BP) in sediment and soil was developed by gas chromatography/mass selective detector/selected ion monitoring (GC/MSD/SIM). The ultrasonic extraction of US EPA (method 3550B) method and liquid-liquid extraction for sediment and soil samples were used for the analysis of BP from sediment and soil. BP was extracted with n-hexane. Organic layer was washed with 5% sodium chloride solution. 1∼2 l of the concentrated solution of organic layer was applied to GC/MSD. The retention time of BP peak was 11.10 min. Recovery (%) of BP by ultrasonication from sediment and soil samples was 96.0∼100.6% and 40.0∼83.0%, respectively. Recovery of BP by liquid-liquid extraction was 51∼59% in soil samples. The detection limit of BP in sediment and soil samples were determined to 0.1 ng/g.

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A study on the determination of residual Antibiotics and Synthetic Antibacterial Agents in Meat(III) Simultaneous Gas Chromatography/Mass Spectrometry Analysis of Erythromycin and Tylosin (식육중의 잔류 항생.항균제의 검정에 관한 연구(III) Macrolide계 항생물질인 Erythromycin과 Tylosin의 Gas Chromatography/Mass Spectrometry 동시분석)

  • 류재천;송윤선;양종순;서지원;김명수;박종세
    • Journal of Food Hygiene and Safety
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    • v.8 no.1
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    • pp.17-23
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    • 1993
  • In an attempt to quantitate and qualitate residual antibiotics and antibacterial agents n meat simultaneously, we studied a gas chromatogrphy-mass spectrometry (GC/MS) analysis. For a simultaneous analysis of macrolide antibiotics such as erythromycin and tylosin in meat, the homogenization with MeOH, defatting with n-hexane, extraction with CHCl3, elution with CHCl3 : MeOH=2:1 from Sep-Pak silica cartridge, acid gydrolysis, back extraction with CHCl3, and quantitation by selected ion monitoring(SIM) mode after trimethylsilyl derivatization were performed. The recoveries of erythromycin and tylosin (CV,%) at 10 ppm fortification level were 90.59(4.89) and 45.91(0.20) , and the detection limits of those were 0.02 and 2.0 $\mu\textrm{g}$/g beef, respectively. From these results, the developed analytical method using GC/MS-SIM mode allows excellent detection and quantitation of residual macrolide antibiotics in meats, using complementary method with bio-assay.

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Analysis of Residual Furan in Human Blood Using Solid Phase Microextraction-Gas Chromatography/Mass Spectrometry (SPME-GC/MS)

  • Lee, Yun-Kyung;Jung, Seung-Won;Lee, Sung-Joon;Lee, Kwang-Geun
    • Food Science and Biotechnology
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    • v.18 no.2
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    • pp.379-383
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    • 2009
  • For an accurate risk assessment of furan, a potential human carcinogen, levels must be determined in human blood plasma using a simple and robust assay. In this study, solid phase microextraction-gas chromatography/mass spectrometry (SPME-GC/MS) was used to analyze blood plasma levels of furan in 100 healthy individuals who consumed a normal diet. The subjects were 30 to 70 years of age and 51% were women. Ultimately, an analytical method was established for analyzing furan in human blood. The limit of quantification (LOQ) and furan recovery rate in blood were 1.0 ppb and 104%, respectively. Finally, furan was detected in 21 individuals (13 males, 8 females) with levels ranging up to 17.86 ppb (ng furan/g food).

Measurement of Aldehydes in Replacement Liquids of Electronic Cigarettes by Headspace Gas Chromatography-mass Spectrometry

  • Lim, Hyun-Hee;Shin, Ho-Sang
    • Bulletin of the Korean Chemical Society
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    • v.34 no.9
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    • pp.2691-2696
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    • 2013
  • The electronic cigarette (E-cigarette) is a battery-powered device that aerosolizes nicotine so that it is readily delivered into the respiratory tract. The analytical data regarding the substances present in E-cigarettes are very limited. The aim of this study was to measure the concentration of aldehydes-formaldehyde (FA), acetaldehyde (AA) and, acrolein (AL)-in 225 replacement liquid brands from 17 E-cigarette shops sold in the Republic of Korea by headspace solid-phase micro extraction and gas chromatography-mass spectrometry (HS-SPME GC-MS). The concentration range of FA and AA was 0.02-10.09 mg/L (mean = 2.16 mg/L, detected in 207 of 225 samples) and 0.10-15.63 mg/L (mean = 4.98 mg/L, detected in all samples), respectively. AL was not detected in any of 225 replacement liquids. FA and AA were originally present in almost all replacement liquids of electronic cigarettes.