By the use of thin layer chromatography, gas‐liquid chromatography, the Liebermann‐Burchard reaction and mass‐spectrometry, 4α,14α‐dimethyl‐Δ 8,24(28) ‐ergostadien‐3β‐ol (obtusifoliol) and cycloeucalenol have been demonstrated in grapefruit peel. Gas‐liquid chromatography has also revealed the presence of these compounds in several other plant tissues.
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Goad et al. (1967) studied this question.
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