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Sterols stanons

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https://www.readbyqxmd.com/read/22560452/combined-quantification-of-faecal-sterols-stanols-stanones-and-bile-acids-in-soils-and-terrestrial-sediments-by-gas-chromatography-mass-spectrometry
#1
Jago Jonathan Birk, Michaela Dippold, Guido L B Wiesenberg, Bruno Glaser
Faeces incorporation can alter the concentration patterns of stanols, stanones, Δ(5)-sterols and bile acids in soils and terrestrial sediments. A joint quantification of these substances would give robust and specific information about the faecal input. Therefore, a method was developed for their purification and determination via gas chromatography-mass spectrometry (GC-MS) based on a total lipid extract (TLE) of soils and terrestrial sediments. Stanols, stanones, Δ(5)-steroles and bile acids were extracted by a single Soxhlet extraction yielding a TLE...
June 15, 2012: Journal of Chromatography. A
https://www.readbyqxmd.com/read/16676121/comparative-characterization-of-a-wool-wax-extract-by-two-complementary-chromatographic-techniques
#2
COMPARATIVE STUDY
Eric Jover, Carmen Domínguez, Pilar Erra, Josep Maria Bayona
A detailed characterization of lipids present in a wool-wax extract, obtained by supercritical fluid extraction, is presented. Thin-layer chromatography coupled to a flame ionization detector (TLC-FID) has been used as a screening technique to identify the different chemical classes of complex mixtures. Furthermore, to confirm peak identification obtained by TLC-FID and to check its suitability as a quality control technique, preparative TLC fractionation has been carried out by re-analyzing the different fractions obtained by TLC-FID and by gas chromatography coupled to mass spectrometry in the electron impact and in the chemical ionization modes...
January 2006: Journal of Cosmetic Science
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