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digitalin 毛地黃苷; 洋地黃甙 毛地黃□; 洋地黃□ digitalin n 1: a powerful cardiac stimulant obtained from foxglove [ synonym: { digitalis}, { digitalis glycoside}, { digitalin}] digitalin \ dig" i* ta` lin\, n. [ Cf. F. digitaline.] ( a) ( Medicine, Pharmacy) Any one of several extracts of foxglove ({ Digitalis}), as the " French extract," the " German extract," etc., which differ among themselves in composition and properties. Both { Digitalis lanata} and { Digitalis purpurea} have been used to prepare such extracts. ( b) ( Chem.) the distinctive chemical substance, a steroid glycoside, which is the essential ingredient of the extracts of foxglove. It is a white, crystalline substance ({ C36H56O14}), and is a 3- substituted diglucoside of a steroid. It is a powerful cardiac stimulant and is used as a cardiotonic for treatment of certain heart conditions, such as congestive heart failure. Chemically it is ( 3[ beta], 5[ beta], 16[ beta])- 3-[ 6- Deoxy- 4- O-[ beta]- D- glucopyranosyl- 3- O- methyl-[ beta]- D- galactopyranosyl) oxy]- 14, 16- dihyroxy- card- 20 ( 22)- enolide. The related compounds { digitoxin} and { digoxin} are also extracted from the foxglove. The class of steroid glycosides having cardiotonic properties are refered to as the cardiac glycosides. -- MI11 Syn: digitalinum verum, Diginorgin, Schmiedeberg' s digitalin, digitalis, digitalis glycoside. [ 1913 Webster PJC]
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