Results 31 to 40 of about 722,676 (339)

Recent progress on the detection of animal-derived food stimulants using mass spectrometry-based techniques

open access: yesFrontiers in Nutrition, 2023
BackgroundThe misuse of animal-derived stimulants in food is becoming increasingly common, and mass spectrometry (MS) is used extensively for their detection and analysis.
Qiang Zhang, Hongying Du, Yingjian Zhang
doaj   +1 more source

Analysis of biogenic carbonyl compounds in rainwater by stir bar sorptive extraction technique with chemical derivatization and gas chromatography-mass spectrometry [PDF]

open access: yes, 2017
Stir bar sorptive extraction is a powerful technique for the extraction and analysis of organic compounds in aqueous matrices. Carbonyl compounds are ubiquitous components in rainwater, however, it is a major challenge to accurately identify and ...
Aguirre   +32 more
core   +1 more source

Separation of Oligosaccharides from Lotus Seeds via Medium-pressure Liquid Chromatography Coupled with ELSD and DAD [PDF]

open access: yes, 2017
peer-reviewedLotus seeds were identified by the Ministry of Public Health of China as both food and medicine. One general function of lotus seeds is to improve intestinal health.
AD Orozco-Cortes   +39 more
core   +1 more source

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

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

Pots and lipids: molecular and isotope evidence of the food processing at Maharski prekop

open access: yesDocumenta Praehistorica, 2012
The pottery assemblage from the Maharski prekop site was analysed to obtain insights into vessel use and husbandry practices. Total lipid extracts of pottery samples were subjected to gas chromatography (GC), gas chromatography–mass spectrometry (GC–MS),
Nives Ogrinc   +4 more
doaj   +1 more source

Mobile Image Ratiometry: A New Method for Instantaneous Analysis of Rapid Test Strips [PDF]

open access: yes, 2012
Here we describe Mobile Image Ratiometry (MIR), a new method for the automated quantification of standardized rapid immunoassay strips using consumer-based mobile smartphone and tablet cameras.
Bryan Callahan   +3 more
core   +2 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

Gas chromatographic-mass spectrometric analysis of tar compounds formed during pyrolysis of rice husks [PDF]

open access: yes, 1991
Pyrolysis of agricultural waste to produce fuel gas involves formation of tars as noxious by-products. In this paper the qualitative analysis of tars formed during pyrolysis of rice husks is presented, based on identification by gas chromatography—mass ...
Haanappel, V.A.C.   +4 more
core   +2 more sources

Analytical characterization of some synthetic cannabinoids, derivatives of indole-3-carboxylic acid [PDF]

open access: yes, 2013
By means of gas chromatography with high resolution mass spectrometry (GC-HRMS), ultra-high performance liquid chromatography in combination with high resolution tandem mass spectrometry (UHPLC-HRMS), nuclear magnetic resonance spectroscopy (NMR) and ...
Eltsov, O.   +4 more
core   +1 more source

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