Potential Urinary Biomarkers of Young Adults With Short-Term Co-Exposure to Particulate Matter and Bioaerosols in a Time Course Identified by an Unbiased Metabolomic Approach With Gas/Liquid Chromatography–Mass Spectroscopy

2021 ◽  
Author(s):  
Guang-xi Li ◽  
Yuan-yuan Duan ◽  
Yi Wang ◽  
Ling-jie Bian ◽  
Meng-ran Xiong ◽  
...  
Keyword(s):  
Young Adults ◽  
Liquid Chromatography ◽  
Particulate Matter ◽  
Mass Spectroscopy ◽  
Time Course ◽  
Urinary Biomarkers ◽  
Gas Liquid Chromatography ◽  
Short Term ◽  
Metabolomic Approach

Determination of Benzaldehyde in Wines and Amyl Acetate and Isoamyl Acetate in Liqueurs by Gas-Liquid Chromatography and Confirmation by Mass Spectroscopy

1975 ◽  
Vol 58 (3) ◽  
pp. 582-584
Author(s):  
Glenn E Martin ◽  
Peter C Buscemi ◽  
Boyd B Butts
Keyword(s):  
Liquid Chromatography ◽  
Mass Spectroscopy ◽  
Isoamyl Acetate ◽  
Liquid Extraction ◽  
Amyl Acetate ◽  
Alcoholic Beverages ◽  
Gas Liquid Chromatography ◽  
Liquid Liquid Extraction ◽  
Liquid Chromatographic

Abstract Liquid-liquid extraction was carried out prior to gas-liquid chromatographic (GLC) determination of amyl and isoamyl acetate in alcoholic beverages. The concentrations of amyl acetate and isoamyl acetate ranged from 4 to 29 and 2.5 to 322 ppm, respectively. Recovery studies for isoamyl and amyl acetate were carried out; these compounds were recovered at 90 and 92%, respectively. A liquid-liquid extraction also was carried out prior to the GLC determination of benzaldehyde. When chloroform was used in the liquid extraction, the results obtained by the GLC procedure compared favorably in most cases with those obtained by the ultraviolet spectrophotometric procedure. In the GLC method the benzaldehyde varied from 5 to 150 ppm for both imported and natural wines. The compounds in the effluent from the chromatograph, namely, amyl acetate, isoamyl acetate, and benzaldehyde, were confirmed by mass spectroscopy.

Study of photolysis of 1,3-bis(4-nitrophenyl)-1-butene in acetonitrile and 2-propanol

1983 ◽  
Vol 48 (1) ◽  
pp. 279-285
Author(s):  
Gabriel Čík ◽  
Ľubomír Lapčík ◽  
Anton Blažej ◽  
Igor Šurina
Keyword(s):  
Liquid Chromatography ◽  
Reaction Mechanism ◽  
Mass Spectroscopy ◽  
Uv Spectra ◽  
Gas Liquid Chromatography ◽  
Mercury Lamp ◽  
Reaction Products ◽  
Polychromatic Radiation

Photolysis of 1,3-bis(4-nitrophenyl)-1-butene (I) in acetonitrile and 2-propanol by polychromatic radiation of a mercury lamp was studied. The photolysis kinetics was followed by UV spectra and the reaction products were analysed by IR and mass spectroscopy and by gas-liquid chromatography. The reaction mechanism in markedly affected by the presence of oxygen. Photolysis of I in acetonitrile gives mainly 4-nitrobenzaldehyde, n-heptane and toluene, in 2-propanol the principal products are stereoisomeric 1,3-diphenyl-1-butenes.

Gas-Liquid Chromatography-Mass Spectroscopy Determination of Clopamide in Plasma

1989 ◽  
Vol 78 (8) ◽  
pp. 679-682 ◽  
Author(s):  
Wolfgang Stüber ◽  
Henning Blume ◽  
Fritz Sörgel ◽  
Gerd Stenzhorn
Keyword(s):  
Liquid Chromatography ◽  
Mass Spectroscopy ◽  
Gas Liquid Chromatography

scholarly journals Myocardial Lipid Profiling During Time Course of High Fat Diet and its Relationship to the Expression of Fatty Acid Transporters

2015 ◽  
Vol 37 (3) ◽  
pp. 1147-1158 ◽  
Author(s):  
Ewa Harasim ◽  
Tomasz Stępek ◽  
Karolina Konstantynowicz-Nowicka ◽  
Marcin Baranowski ◽  
Jan Górski ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Liquid Chromatography ◽  
Fatty Acid ◽  
Lipid Profile ◽  
High Fat Diet ◽  
Time Course ◽  
Whole Body ◽  
Gas Liquid Chromatography ◽  
High Fat ◽  
Lipid Fractions

Background/Aims: It is well documented that increased fatty acids (FA) supply causes lipid accumulation and insulin resistance in skeletal muscles. Whether the same mechanism is present in the heart is still unclear. Therefore, the goal of our study was to determine the content of specific myocardial lipid fractions during feeding rats a high fat diet (HFD) for 5 weeks. Moreover, the relation between changes in myocardial lipid content, whole body insulin resistance and the expression of fatty acid transporters in each week of HFD was established. Methods: Gas liquid chromatography and high performance liquid chromatography were used to determine the content of lipid fractions in the left ventricle. Expression of selected proteins was estimated by Western blot technique. All measurements were made after each week of HFD. Results: As expected, lipid profile in myocardium was altered by HFD in different weeks of the study with the most intense changes in triacylglycerols, long chain fatty acid-CoA and ceramide. Furthermore, there was a significant elevation of plasmalemmal (the 4th and the 5th week) and mitochondrial expression (from the 3rd to the 5th week) of fatty acid translocase. Conclusion: High fat diet affects myocardial lipid profile in each week of its duration and causes alternations in FA metabolism in cardiomyocytes.

Survey of 1975 Wheat and Soybeans for Aflatoxin, Zearalenone, and Ochratoxin

1977 ◽  
Vol 60 (4) ◽  
pp. 778-783
Author(s):  
Odette L Shotwell ◽  
Marion L Goulden ◽  
Glenn A Bennett ◽  
Ronald D Plattner ◽  
Clifford W Hesseltine
Keyword(s):  
North Carolina ◽  
Liquid Chromatography ◽  
Ochratoxin A ◽  
Mass Spectroscopy ◽  
Gas Liquid Chromatography ◽  
Southern Illinois

Abstract Wheat samples (102 lots) were collected from Virginia, North Carolina, southeastern Missouri, southern Illinois, and Kentucky. Soybean samples (180 lots) were collected from Virginia, Illinois, Iowa, Minnesota, Nebraska, Alabama, Arkansas, and Texas. Samples of both commodities were analyzed for zearalenone, aflatoxin, and ochratoxin by the Eppley method. None of the 3 mycotoxins was detected in soybeans. Aflatoxins and ochratoxin A were not detected in wheat, but zearalenone was detected in 19 of 42 samples collected in Virginia. Half of the Virginia samples were collected because they were mold-damaged. Zearalenone levels ranged from 0.36 to 11.05 ppm; the identity of the zearalenone was confirmed by gas-liquid chromatography and mass spectroscopy. Gibberella zea infection (6–60%) was detected in all of the zearalenone-positive samples; 6–60% of the kernels in the samples tested contained G. zea.

Terbufos and Its Metabolites: Identification by Gas-Liquid Chromatography and Mass Spectrometry

1982 ◽  
Vol 65 (3) ◽  
pp. 680-684
Author(s):  
Lester Y Wei ◽  
Allan S Felsot
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Liquid Chromatography ◽  
Mass Spectroscopy ◽  
Soil Samples ◽  
Gas Liquid Chromatography

Abstract Methods have been developed for identification of terbufos, terbufos sulfoxide, terbufos sulfone, terbufoxon, terbufoxon sulfoxide, and terbufoxon sulfone by mass spectrometry. Residues of terbufos and terbufos sulfone fortified in soil samples at 5 ppm were extracted and analyzed successfully by gas chromatography and mass spectroscopy.

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