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Identification of chondrillasterol in two Cucurbitaceae seed oils by proton nuclear magnetic resonance spectroscopy
Author(s) -
Iida T.,
Jeong T. M.,
Tamura T.,
Matsumoto T.
Publication year - 1980
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/bf02534122
Subject(s) - gourd , cucurbitaceae , proton magnetic resonance , epimer , nuclear magnetic resonance spectroscopy , chemistry , spectroscopy , botany , chromatography , stereochemistry , nuclear magnetic resonance , biology , food science , physics , quantum mechanics
The absolute configuration at C‐24 of C‐24 epimeric 24‐ethyl‐5α‐cholesta‐7,E‐22‐dien‐3β‐ols I–IV previously isolated from tea seed oil, shea fat, and gourd and sponge cucumber seed oils, respectively, was studied by proton nuclear magnetic resonance spectroscopy. The results showed that the sterols I and II are identical with spinasterol (24S/α‐ethyl group), whereas the sterols III and IV are identified as its 24R/β‐epimer, chondrillasterol. This study has thus for the first time properly documented the presence in tracheophytes of a 24β‐ethylsterol in which Δ 25(27) ‐bond is reduced.