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Bitencourt M, Viana OMMS, Viana ALM, Freitas JTJ, de Melo CC, Doriguetto AC. Buclizine crystal forms: First Structural Determinations, counter-ion stoichiometry, hydration, and physicochemical properties of pharmaceutical relevance. Int J Pharm 2020; 589:119840. [PMID: 32890657 DOI: 10.1016/j.ijpharm.2020.119840] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 08/13/2020] [Accepted: 08/30/2020] [Indexed: 10/23/2022]
Abstract
Buclizine (BCZ) is a chiral synthetic piperazine derivative which has antihistaminic, anti-muscarinic and antiemetic properties, and has been reintroduced as an appetite stimulant, especially for pediatric patients. Structural information about this drug, as well as other buclizine crystalline forms (solvates, salts and co-crystals) including the BCZ free-base (BCZ-FB), is non-existent. Here, we present for the first time the crystal structure of the monohydrochloride monohydrate salt of BCZ (BCZHCl·H2O), and of its anhydrous form, BCZHCl. Interestingly, BCZHCl·H2O was obtained by recrystallization from the raw material (BCZH2Cl2) in ethanol:water solution showing that BCZ anhydrous dihydrochloride salt changes easily to a monohydrochloride monohydrate salt modification, which raise concerns about formulation quality control. BCZHCl·H2O and BCZHCl crystallize in the orthorhombic space groups (Pna21 and Pca21) belonging to the mm2 point group and are thus classified as non-centrosymmetric achiral structures (NA). Intuitively, we expect these salts to crystallize in a space group with a center of symmetry, since less than 5% of the known racemic compounds crystallize in the NA type. The crystal structures of BCZH2Cl2 and BCZ-FB were not determined, but their existence was verified by other techniques (chloride ion analysis, PXRD, HPLC, FT-IR, DSC, TGA) and by comparison of the obtained results with those found for BCZHCl. Additionally, we have also performed an evaluation of the equilibrium solubility (at six different aqueous media) and the dissolution profile of the BCZHCl salt compared to the raw material and BCZ-FB. Different equilibrium solubility values were found comparing the three forms in acidic and neutral pH ranges and all of them were insoluble at pH > 7.0. Moreover, tablets prepared with BCZH2Cl2, BCZHCl or BCZ-FB show significant differences in terms of dissolution profile.
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Affiliation(s)
- Monalisa Bitencourt
- Faculty of Pharmaceutical Sciences, Federal University of Alfenas, Rua Gabriel Monteiro da Silva, 701 Alfenas, Minas Gerais 37130-001, Brazil; Novartis Pharmanalytica AS, Via Serafino Balestra, 31, 6600 Locarno, Switzerland
| | - Olimpia Maria Martins Santos Viana
- Faculty of Pharmaceutical Sciences, Federal University of Alfenas, Rua Gabriel Monteiro da Silva, 701 Alfenas, Minas Gerais 37130-001, Brazil
| | - Andre Luiz Machado Viana
- Faculty of Pharmaceutical Sciences, Federal University of Alfenas, Rua Gabriel Monteiro da Silva, 701 Alfenas, Minas Gerais 37130-001, Brazil
| | - Jennifer Tavares Jacon Freitas
- Faculty of Pharmaceutical Sciences, Federal University of Alfenas, Rua Gabriel Monteiro da Silva, 701 Alfenas, Minas Gerais 37130-001, Brazil
| | - Cristiane Cabral de Melo
- Faculty of Pharmaceutical Sciences, Federal University of Alfenas, Rua Gabriel Monteiro da Silva, 701 Alfenas, Minas Gerais 37130-001, Brazil; Institute of Chemistry, Federal University of Alfenas, Rua Gabriel Monteiro da Silva, 701, Alfenas, Minas Gerais 37130-001, Brazil.
| | - Antonio Carlos Doriguetto
- Faculty of Pharmaceutical Sciences, Federal University of Alfenas, Rua Gabriel Monteiro da Silva, 701 Alfenas, Minas Gerais 37130-001, Brazil; Institute of Chemistry, Federal University of Alfenas, Rua Gabriel Monteiro da Silva, 701, Alfenas, Minas Gerais 37130-001, Brazil.
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