title: Analysis of sponge sterols as the trimethylsilyl ethers and as the corresponding 5 alpha-and delta 4-3-ketosteroids using open-tubular gas chromatography-mass spectrometry. Application of selective enzymic oxidation.
mesh_terms: D002849:Chromatography, Gas; D006913:Hydroxysteroid Dehydrogenases / Q000378:metabolism; D007664:Ketosteroids / Q000032:analysis*; D013058:Mass Spectrometry; D013261:Sterols / Q000032:analysis*; D014297:Trimethylsilyl Compounds / Q000032:analysis
chemical_list: D007664:Ketosteroids; D013261:Sterols; D014297:Trimethylsilyl Compounds; D006913:Hydroxysteroid Dehydrogenases