title: Mechanism of nanoparticle formation from ternary coground phenytoin and its derivatives.
abstract: The mechanism of drug nanoparticle formation of phenytoin (DPH) and its derivatives monomethylphenytoin (MDPH) and dimethylphenytoin (DMDPH) was investigated. The drug, polyvinylpyrrolidone K17 (PVP), and sodium dodecyl sulfate were coground to obtain the ground mixture (GM). The DPH GM was amorphous; however, MDPH and DMDPH GMs contained drug crystals. Spectral changes in infrared and (13)C solid-state nuclear magnetic resonance were observed in the DPH GM, partially observed in the MDPH GM, and hardly observed in the DMDPH GM. Mean particle sizes of the DPH, MDPH, and DMDPH GM nanosuspension were almost the same; however, stability after storage differed in the order of DPH > MDPH > DMDPH. The intermolecular interaction between the drug and PVP reflected not only the crystallinity of the drug in the GM but also the stability of the GM suspension. The size and stiffness of drug nanoparticles were evaluated using atomic force microscopy. Crystallization of the amorphous GM and agglomeration of the primary nanocrystals were observed in the DPH GM suspension. In contrast, primary nanocrystals were observed in the DMDPH GM suspension. The size of the drug nanocrystals formed from the different molecular states of the drug in the GM reflects the agglomerated states in water and stability.
authors.affiliation: Graduate School of Pharmaceutical Sciences, Chiba University, Chiba 260-8675, Japan. moribe@p.chiba-u.ac.jp
authors.forename: Kunikazu
authors.initials: K
authors.lastname: Moribe
authors.forename: Akiko
authors.initials: A
authors.lastname: Ogino
authors.forename: Takuya
authors.initials: T
authors.lastname: Kumamoto
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Ishikawa
authors.forename: Waree
authors.initials: W
authors.lastname: Limwikrant
authors.forename: Kenjirou
authors.initials: K
authors.lastname: Higashi
authors.forename: Keiji
authors.initials: K
authors.lastname: Yamamoto
mesh_terms: D002626:Chemistry, Pharmaceutical; D003460:Crystallization; D004355:Drug Stability; D009682:Magnetic Resonance Spectroscopy; D008745:Methylation; D018625:Microscopy, Atomic Force; D053758:Nanoparticles; D036103:Nanotechnology; D010316:Particle Size; D010672:Phenytoin / Q000031:analogs & derivatives / Q000737:chemistry*; D011205:Povidone / Q000737:chemistry; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013678:Technology, Pharmaceutical / Q000379:methods; D014867:Water / Q000737:chemistry
chemical_list: D014867:Water; D012967:Sodium Dodecyl Sulfate; D010672:Phenytoin; D011205:Povidone