title: Automated gas chromatographic assay for amlodipine in plasma and gingival crevicular fluid.
abstract: This paper describes an automated capillary gas chromatographic method for the determination of amlodipine in plasma, and in sub-microlitre volumes of gingival crevicular fluid (GCF), in order to assess if amlodipine is present in GCF under conditions of gingival overgrowth, as has been shown for nifedipine, another dihydropyridine drug. Liquid-liquid extraction followed by derivatisation was employed to isolate amlodipine and render it suitable for gas chromatography. Amlodipine was analysed in plasma and GCF of four patients undergoing amlodipine therapy for cardiovascular disorders, three of whom had significant gingival overgrowth. Amlodipine was detected in the plasma of all patients and in massive concentrations in the GCF of those patients with overgrowth, 23- to 290-fold greater than in their plasma. Like nifedipine, amlodipine sequestration into GCF appears to be linked with gingival overgrowth.
authors: Department of Pharmacological Sciences, Medical School, University of Newcastle upon Tyne, UK.
authors: S C
authors: SC
authors: Monkman
authors: J S
authors: JS
authors: Ellis
authors: S
authors: S
authors: Cholerton
authors: J M
authors: JM
authors: Thomason
authors: R A
authors: RA
authors: Seymour
authors: J R
authors: JR
authors: Idle
mesh_terms: D017311:Amlodipine / Q000009:adverse effects / Q000032:analysis* / Q000097:blood*; D000787:Angina Pectoris / Q000188:drug therapy; D001322:Autoanalysis; D002849:Chromatography, Gas / Q000379:methods*; D005883:Gingival Crevicular Fluid / Q000737:chemistry*; D005882:Gingival Diseases / Q000139:chemically induced; D006801:Humans; D006973:Hypertension / Q000188:drug therapy
chemical_list: D017311:Amlodipine