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- W1999596033 abstract "Abstract 4‐Demethylsterol and triterpene alcohol compositions of two Vanilla bean species ( V. fragrans and V. tahitensis ) were investigated. From retention times and gas chromatography‐mass spectrometry, nine 4‐demethylsterols were identified in V. fragrans and seven in V. tahitensis . The 4‐demethylsterol fraction of V. fragrans was characterized by a high content of 24‐methylene cholesterol (27–40%) and of β‐sitosterol (35–46%). The 4‐demethylsterol fraction of V. tahitensis was characterized by a high content of stigmasterol (27%) and of β‐sitosterol (57.5%), and a lower amount of 24‐methylene cholesterol (5%). Vanilla tahitensis was also characterized by the presence of ergosta‐5,25‐dien‐3β‐ol (2%) and the absence of campesterol, stigmasta‐5,22,25‐trien‐3β‐ol, and ergosta‐7,24(28)‐dien‐3β‐ol. The beans’ age modified the ratio 24‐methylene cholesterol/β‐sitosterol in V. fragrans . Combining liquid chromatography and gas chromatography allowed the identification of four other demethylsterols in V. fragrans (brassicasterol, 0.02%; stigmasta‐5,23‐dien‐3β‐ol, 1.43%; stigmasten‐22‐ol, 0.1%; and fucosterol, 0.5%) from the 4‐demethylsterol fraction. 24‐Methylene cholesterol and β‐sitosterol were isolated, and their structures were confirmed by 1 H and 13 C nuclear magnetic resonance. Four triterpene alcohols were identified in V. fragrans , including cycloartenol (0.9–1.6%) from the triterpene alcohol fraction, 24‐dihydrotirucallol (17–23%) from the triterpene alcohol fraction, tirucall‐7‐en‐3β‐ol (6–7.5%) from the triterpene alcohol fraction, and in a higher content cyclosadol (66–69%) from the triterpene alcohol fraction. The content ranges were studied as a function of the beans’ age. Demethylsterol and triterpene alcohols profile could be used for origin differentiation." @default.
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- W1999596033 date "1998-01-01" @default.
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- W1999596033 title "4-Demethylsterols and triterpene alcohols from two Vanilla bean species: Vanilla fragrans and V. tahitensis" @default.
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- W1999596033 doi "https://doi.org/10.1007/s11746-998-0009-8" @default.
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