| 释义 |
phytol Biochem.|ˈfaɪtɒl|
[a. G. phytol (Willstätter & Hocheder 1907, in Ann. d. Chem. CCCLIV. 207): see phyt- and -ol.]
A colourless oil whose molecule forms part of that of chlorophyll and vitamins E and K, and which is an acyclic terpenoid alcohol; 3,7,11,15-tetramethyl-2-hexadecenol, C20H40O.
1907Jrnl. Chem. Soc. XCII. i. 784 The authors have been able..to remove the magnesium quantitatively and to obtain for the first time an ashless compound closely related to chlorophyll. This derivative is an ester, termed phaeophytin, and is hydrolysed readily by alkalis, yielding an unsaturated alcohol, phytol, C20H40O, which is formed also by the action of alkalis on chlorophyll. For the hypothetical saturated hydrocarbon, corresponding with this alcohol, the authors propose the name phytane. 1911[see phytane]. 1950[see phæophorbide]. 1974Sci. Amer. Dec. 73/1 Attached to the porphyrin ring in chlorophyll is a long hydrocarbon ‘tail’, the phytol chain. It consists of carbon atoms linked together, but only one of the bonds is double. 1977Nature 18 Aug. 621/2 The precursors of these hydrocarbons are unknown, but it is surmised that they result from the diagenesis of phytol, a moiety widely distributed among plant pigments.
Hence ˈphytyl |-ɪl, -aɪl|, the univalent radical derived from phytol by the loss of a hydrogen atom.
1911Jrnl. Chem. Soc. C. i. 145 Phytyl hydrogen phthalates, CO2H·C6H4·CO2·C20H39, are formed when the phytol and phthalic anhydride are boiled for five hours with benzene. 1956[see phæophorbide]. 1973Nature 20 July 155/1 Although other contributors, such as vitamin K1, α-tocopherol and phospholipids from..bacteria and algae which have been shown to possess a phytyl side chain, are also possible, the most obvious source for the ketone is phytol. |