title: An Efficient Ion-Pair Liquid Chromatographic Method for the Determination of Some H2 Receptor Antagonists.
abstract: A simple, efficient and reliable ion-pair chromatography (IPC) method was developed and validated for the determination of some H2 receptor antagonists including ranitidine (RAN), nizatidine (NIZ) and famotidine (FAM). The use of IPC separations provided improved peak resolution with good peak shape in short analysis time and augmented method selectivity compared with the frequently used RP-C18 methods. A simple isocratic mode with mobile phase containing acetonitrile and 20 mM acetate buffer (50 : 50, v/v) containing 20 mM sodium dodecyl sulfate was used for separation. The flow rate was set at 1.0 mL min(-1), and the effluent was monitored by UV detector at 280 nm FAM and 320 nm for NIZ and RAN. The method was validated in accordance with International Conference on Harmonization guidelines and shown to be suitable for intended applications. The limits of detections and quantitations were 0.008-0.011 and 0.025-0.033 µg mL(-1), respectively. The proposed IPC method was successfully applied for the determination of pharmaceutical dosage forms without prior need for separation. Additionally, the developed method was applied for the determination of RAN in rabbit plasma using NIZ as the internal standard. The method entailed direct injection of the plasma samples after deproteination using methanol. Finally, the proposed IPC method was applied successfully in a pharmacokinetic study for RAN in rabbits after a single oral dose of RAN.
authors.affiliation: Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt.
authors.forename: Salwa R
authors.initials: SR
authors.lastname: Elshaboury
authors.affiliation: Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt.
authors.forename: Niveen A
authors.initials: NA
authors.lastname: Mohamed
authors.affiliation: Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt Pharmacognosy and Pharmaceutical Chemistry Department, College of Pharmacy, Taibah University, Al Madinah AlMunawarah 30001, Kingdom of Saudi Arabia sameh_aa@yahoo.com.
authors.forename: Sameh
authors.initials: S
authors.lastname: Ahmed
authors.affiliation: Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt.
authors.forename: Shereen
authors.initials: S
authors.lastname: Farrag
mesh_terms: D000097:Acetonitriles; D000284:Administration, Oral; D000818:Animals; D002021:Buffers; D002851:Chromatography, High Pressure Liquid / Q000379:methods* / Q000592:standards; D015738:Famotidine / Q000097:blood / Q000493:pharmacokinetics*; D005260:Female; D006635:Histamine H2 Antagonists / Q000097:blood / Q000493:pharmacokinetics*; D006801:Humans; D057230:Limit of Detection; D016567:Nizatidine / Q000097:blood / Q000493:pharmacokinetics*; D011817:Rabbits; D011899:Ranitidine / Q000097:blood / Q000493:pharmacokinetics*; D012967:Sodium Dodecyl Sulfate; D012997:Solvents
chemical_list: D000097:Acetonitriles; D002021:Buffers; D006635:Histamine H2 Antagonists; D012997:Solvents; D012967:Sodium Dodecyl Sulfate; D015738:Famotidine; D011899:Ranitidine; D016567:Nizatidine; C032159:acetonitrile