title: Structural evaluation of probucol nanoparticles in water by atomic force microscopy.
abstract: Structural evaluation of probucol nanoparticles coground with polyvinylpyrrolidone K17 and sodium dodecyl sulfate for 90 min was performed by solid-state nuclear magnetic resonance (NMR) spectroscopy and atomic force microscopy (AFM) with force-distance curve analysis. The results of solid-state NMR indicated that the cogrinding changed crystalline probucol to amorphous form. The number-averaged mean heights of probucol particles in the ground mixture (GM) suspension were determined by AFM to be 6 and 15 nm for freshly prepared and 24h-stored samples, respectively. Nucleation and the subsequent crystal growth might have occurred after the GM was dispersed in water. The presence of probucol nanocrystals and agglomeration of the primary probucol nanoparticles were recognized by AFM force-distance curve analysis. AFM could be a promising tool to evaluate the structure of nanoparticles as well as their agglomeration behavior in aqueous media.
authors.affiliation: Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8675, Japan. moribe@p.chiba-u.ac.jp
authors.forename: Kunikazu
authors.initials: K
authors.lastname: Moribe
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: D000924:Anticholesteremic Agents / Q000008:administration & dosage / Q000737:chemistry*; D003460:Crystallization; D004339:Drug Compounding; D009682:Magnetic Resonance Spectroscopy; D018625:Microscopy, Atomic Force; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D011341:Probucol / Q000008:administration & dosage / Q000737:chemistry*; D013535:Suspensions; D014867:Water / Q000737:chemistry
chemical_list: D000924:Anticholesteremic Agents; D013535:Suspensions; D014867:Water; D011341:Probucol