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• W1994604833 abstract "Abstract The sterols of Zea mays shoots were isolated and characterized by TLC, HPLC, GC/MS and 1 H NMR techniques. In all, 22 4-demethyl sterols were identified and they included trace amounts of the Δ 23 -, Δ 24 - and Δ 25 -sterols, 24-methylcholesta-5, E -23-dien-3β-ol, 24-methylcholesta-5, Z -23-dien-3β-ol, 24-methylcholesta-5,25-dien-3β-ol, 24-ethylcholesta-5,25-dien-3β-ol and 24-ethylcholesta-5,24-dien-3β-ol. In the 4,4-dimethyl sterol fraction, cycloartenol and 24-methylenecycloartanol were the major sterol components but small amounts of the Δ 23 -compound, cyclosadol, and the Δ 25 -compound, cyclolaudenol, were recognized. These various Δ 23 - and Δ 25 -sterols may have some importance in alternative biosynthetic routes to the major sterols, particularly the 24β-methylcholest-5-en-3β-ol component of the C 28 -sterols. Radioactivity from both [2- 14 C]MVA and [methyl- 14 C]methionine was incorporated by Z. mays shoots into the sterol mixture. Although 24-methylene and 24-ethylidene sterols were relatively highly labelled, the various Δ 23 - and Δ 25 -sterols contained much lower levels of radioactivity, which is possibly indicative of their participation in alternative sterol biosynthetic routes. (24R)-24-Ethylcholest-5-en-3β-ol (sitosterol) had a significantly higher specific activity than the 24-methylcholest-5-en-3β-ol indicating that the former is synthesized at a faster rate." @default.
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• W1994604833 date "1984-01-01" @default.
• W1994604833 modified "2023-09-27" @default.
• W1994604833 title "Investigations on the Δ23-, Δ24(28)- and Δ25-Sterols of zea mays" @default.
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• W1994604833 doi "https://doi.org/10.1016/0031-9422(84)83081-2" @default.
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