Acid-catalyzed isomerization of fucosterol and Δ5-avenasterol
| Autor: | Anna-Maija Lampi, Vieno Piironen, Afaf Kamal-Eldin, Jari Toivo, Kaisu Määttä |
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| Rok vydání: | 1998 |
| Předmět: |
Chromatography
Avena Chemistry Anticholesteremic Agents Hydrolysis Organic Chemistry Stigmasterol Fraction (chemistry) Cell Biology Mass spectrometry Avenasterol Biochemistry Gas Chromatography-Mass Spectrometry chemistry.chemical_compound Isomerism Acid catalyzed Seeds Organic chemistry lipids (amino acids peptides and proteins) Acid hydrolysis Fucosterol Isomerization |
| Zdroj: | Lipids. 33:1073-1077 |
| ISSN: | 1558-9307 0024-4201 |
| DOI: | 10.1007/s11745-998-0307-6 |
| Popis: | This work shows that fucosterol, delta5-avenasterol, and similar ethylidene-side chain sterols can undergo acid-catalyzed isomerization to give a mixture of five isomers. Four isomers formed from fucosterol were analyzed, using gas chromatography-mass spectrometry, and were characterized as delta5-avenasterol, two delta5,23-stigmastadienols, and delta5,24(25)-stigmastadienol. When the unsaponifiables fraction from oat oil was subjected to acid hydrolysis, the two delta5,23-stigmastadienol isomers and delta5,24(25)-stigmastadienol were detected while fucosterol coeluted with sitosterol. Interisomerization of ethylidene-side chain sterols represents a limitation to the use of the acid hydrolysis method in the determination of sterols in food and other plant materials rich in these sterols, e.g., oat lipids. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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