Results 51 to 60 of about 403,538 (154)

Carbon isotopic (C-13 and C-14) composition of synthetic estrogens and progestogens [PDF]

open access: yes, 2012
RATIONALE: Steroids are potent hormones that are found in many environments. Yet, contributions from synthetic and endogenous sources are largely uncharacterized.
Aelion   +55 more
core   +2 more sources

Duvatrienediols in cuticular wax of Burley tobacco leaves

open access: yesJournal of Lipid Research, 1976
4, 8, 13-Duvatriene-1, 3-diol diastereoisomers have been identified in the cuticular wax of fresh Burley tobacco leaves. Their structures were determined by gas-liquid chromatography, mass spectrometry, and infrared and ultraviolet spectroscopy ...
S Y Chang, C Grunwald
doaj   +1 more source

Simultaneous Method for Selected PBDEs and HBCDDs in Foodstuffs Using Gas Chromatography—Tandem Mass Spectrometry and Liquid Chromatography—Tandem Mass Spectrometry

open access: yesToxics, 2022
Flame retardants are added to consumer products to retard the ignition of combustible materials. Technical mixtures of polybrominated diphenyl ethers (PBDEs) and hexabromocyclododecane (HBCDD) were massively used for several decades.
Eva Lipičar   +3 more
doaj   +1 more source

Identification of a Widespread Palmitoylethanolamide Contamination in Standard Laboratory Glassware. [PDF]

open access: yes, 2017
Introduction: Fatty acid ethanolamides (FAEs) are a family of lipid mediators that participate in a host of biological functions. Procedures for the quantitative analysis of FAEs include organic solvent extraction from biological matrices (e.g., blood ...
Angelini, Roberto   +3 more
core  

Toxicological Analysis of Some Drugs of Abuse in Biological Samples [PDF]

open access: yes, 2015
Consumption of drugs of abuse is a scourge of modern world. Abuse, drug addiction and their consequences are one of the major current problems of European society because of the significant repercussions in individual, family, social and economic level ...
Baconi, Daniela Luiza   +5 more
core   +3 more sources

Ammonia gas: an improved reagent for chemical ionization mass spectrometry of bile acid methyl ester acetates

open access: yesJournal of Lipid Research, 1981
The ammonia chemical ionization mass spectra of 28 methyl ester acetate derivatives of bile acids and related compounds have been determined by gas-liquid chromatography-mass spectrometry.
B R DeMark, P D Klein
doaj   +1 more source

Honey volatiles as a fingerprint for botanical origin: a review on their occurrence on monofloral honeys [PDF]

open access: yes, 2020
Honeys have specific organoleptic characteristics, with nutritional and health benefits, being highly appreciated by consumers, not only in food but also in the pharmaceutical and cosmetic industries. Honey composition varies between regions according to
Figueiredo, Ana Cristina   +3 more
core   +1 more source

A rapid magnetic solid phase extraction method followed by liquid chromatography-tandem mass spectrometry analysis for the determination of mycotoxins in cereals [PDF]

open access: yes, 2017
Mycotoxins can contaminate various food commodities, including cereals. Moreover, mycotoxins of different classes can co-contaminate food, increasing human health risk.
Capriotti, Anna Laura   +6 more
core   +5 more sources

Effect of different smoking times and temperatures on polycyclic aromatic hydrocarbon concentrations in smoked sausages [PDF]

open access: yesEmirates Journal of Food and Agriculture
Smoked pork and chicken sausages were prepared using three different time-temperature combinations; 60 °C for 4 hours, 75 °C for 3 hours, and 90 °C for 2 hours.
Anindita Mali   +2 more
doaj   +3 more sources

Quantification of sirolimus by liquid chromatography-tandem mass spectrometry using on-line solid-phase extraction [PDF]

open access: yes, 2002
Quantification of the new immunosuppressant sirolimus (syn. rapamycin; Rapamune((R))) in whole blood by chromatography is essential for its clinical use since no immunoassay is available although monitoring is mandatory.
Fleischer, Claudia   +5 more
core   +1 more source

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