Atropine-d5 (Synonyms: DL-Hyoscyamine-d5, Tropine tropate-d5)

Atropine-d₅ is intended for use as an internal standard for the quantification of atropine by GC- or LC-MS. Atropine is a tropane alkaloid that has been found in A. belladonna and acts as a non-selective, competitive antagonist of muscarinic acetylcholine receptors (K_Bs = 0.16-1.26 nM for the M₁-M₅ receptors).^1,2 Atropine increases firing of the sinoatrial node and conduction through the atrioventricular node of the heart, opposes the actions of the vagus nerve, blocks acetylcholine receptor sites, and decreases bronchial secretions.³ Formulations containing atropine have been used to induce mydriasis for ophthalmological exams and in the treatment of cardiac arrest and organophosphate pesticide or muscarinic mushroom poisoning.

1.Sharp, J.M., and Doran, P.M.Characteristics of growth and tropane alkaloid synthesis in Atropa belladonna roots transformed by Agrobacterium rhizogenesJ. Biotechnol.16(3-4)171-185(1990) 2.Caulfield, M.P., and Birdsall, N.J.M.International Union of Pharmacology. XVII. Classification of muscarinic acetylcholine receptorsPharmacol. Rev.50(2)279-290(1998) 3.Broadley, K.J., and Kelly, D.R.Muscarinic receptor agonists and antagonistsMolecules6(3)142-193(2001)