| 释义 |
theophylline Chem.|θiːəʊˈfɪlaɪn|
[irreg. f. mod.L. thea tea + Gr. ϕύλλον leaf + -ine5.]
A colourless alkaloid, C7H8N4O2, found in tea-leaves.
1894in Morley & Muir Watts' Dict. Chem. IV. 682/2. 1899 Syd. Soc. Lex., Theophyllin,..an alkaloid discovered in tea. It is isomeric with the base obtained from cacao (theobromine) and with paraxanthin, but differs from them in its reactions. 1957[see oral a. 4 b]. 1976Lancet 20 Nov. 1115/2 Theophylline..and caffeine have been shown to be strong prostaglandin antagonists and weak agonists. 1983Daily Tel. 18 Aug. 8/6 The council found that tea has three bracing ingredients—caffeine which stimulates the nervous system, and theophylline and theobromine which relax muscles and stimulate the heart. |