70
2. Sterols
3. 24f-METHYLCHOLEST-7-EN-3ß-OL (A
7 -ERGOSTEROL, FUNGISTEROL)
This compound, 24£-methylcholest-7-en-3ß-ol (19) is the major sterol
(71%) of the mixture isolated by Gupta and Scheuer (1968) from the sea
star Acanthaster planci. It is a minor constituent (19%) in the sterol mixture
of the holothurian Holothuria atra. These apparently constitute the only
authentic isolations from marine organisms. It is not known whether the C-24
methyl group is a- or ß-oriented. Knights (1967) has identified this compound
as an oat seed sterol by combined gas-liquid chromatographic and mass
spectrometric techniques. It had been isolated earlier (Pollock and Stevens,
1965) from ergot and other fungi.
19
4. 24j3-METHYLCHOLESTA-5,22-DIEN-3j3-OL (BRASSICASTEROL)
Brassicasterol (20), generally considered a typical phytosterol, was first
isolated from rapeseed oil and was well characterized. Bergmann and Ottke
(1949) reported its isolation from the bivalve Modiolus demissus, and it is
known to occur in other moliusks, e.g., the scallop Placopecten magellanicus
(Idler et al, 1964). Gupta and Scheuer (1969) identified it as the major component in the four-sterol mixture of the coelenterate Zoanthus
confertus.
It is a minor constituent of the green alga Chaetomorpha crassa (Ikekawa
et al, 1968).
20
A supposed C 24 epimer of brassicasterol, designated crinosterol, mp 137°138°, [a] D —47.2°, was reported by Bolker (1967). Bolker's communication
was based on data of some fifteen years earlier and is therefore subject to
2. Sterols
3. 24f-METHYLCHOLEST-7-EN-3ß-OL (A
7 -ERGOSTEROL, FUNGISTEROL)
This compound, 24£-methylcholest-7-en-3ß-ol (19) is the major sterol
(71%) of the mixture isolated by Gupta and Scheuer (1968) from the sea
star Acanthaster planci. It is a minor constituent (19%) in the sterol mixture
of the holothurian Holothuria atra. These apparently constitute the only
authentic isolations from marine organisms. It is not known whether the C-24
methyl group is a- or ß-oriented. Knights (1967) has identified this compound
as an oat seed sterol by combined gas-liquid chromatographic and mass
spectrometric techniques. It had been isolated earlier (Pollock and Stevens,
1965) from ergot and other fungi.
19
4. 24j3-METHYLCHOLESTA-5,22-DIEN-3j3-OL (BRASSICASTEROL)
Brassicasterol (20), generally considered a typical phytosterol, was first
isolated from rapeseed oil and was well characterized. Bergmann and Ottke
(1949) reported its isolation from the bivalve Modiolus demissus, and it is
known to occur in other moliusks, e.g., the scallop Placopecten magellanicus
(Idler et al, 1964). Gupta and Scheuer (1969) identified it as the major component in the four-sterol mixture of the coelenterate Zoanthus
confertus.
It is a minor constituent of the green alga Chaetomorpha crassa (Ikekawa
et al, 1968).
20
A supposed C 24 epimer of brassicasterol, designated crinosterol, mp 137°138°, [a] D —47.2°, was reported by Bolker (1967). Bolker's communication
was based on data of some fifteen years earlier and is therefore subject to