title: Solventless dry powder coating for sustained drug release using mechanochemical treatment based on the tri-component system of acetaminophen, carnauba wax and glidant.
abstract: OBJECTIVE
  Solventless dry powder coating methods have many advantages compared to solvent-based methods: they are more economical, simpler, safer, more environmentally friendly and easier to scale up. The purpose of this study was to investigate a highly effective dry powder coating method using the mechanofusion system, a mechanochemical treatment equipped with high compressive and shearing force.
  
  
  METHODS
  Acetaminophen (AAP) and carnauba wax (CW) were selected as core particles of the model drug and coating material, respectively. Mixtures of AAP and CW with and without talc were processed using the mechanofusion system.
  
  
  RESULTS
  Sustained AAP release was observed by selecting appropriate processing conditions for the rotation speed and the slit size. The dissolution rate of AAP processed with CW substantially decreased with an increase in talc content up to 40% of the amount of CW loaded. Increasing the coating amount by two-step addition of CW led to more effective coating and extended drug release. Scanning electron micrographs indicated that CW adhered and showed satisfactory coverage of the surface of AAP particles.
  
  
  CONCLUSIONS
  Effective CW coating onto the AAP surface was successfully achieved by strictly controlling the processing conditions and the composition of core particles, coating material and glidant. Our mechanochemical dry powder coating method using the mechanofusion system is a simple and promising means of solventless pharmaceutical coating.
authors.affiliation: NIPRO Corporation Pharmaceutical Research Center, Kusatsu, Japan.
authors.forename: Yohei
authors.initials: Y
authors.lastname: Hoashi
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Tozuka
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Takeuchi
mesh_terms: D000082:Acetaminophen / Q000737:chemistry*; D018712:Analgesics, Non-Narcotic / Q000737:chemistry*; D002626:Chemistry, Pharmaceutical / Q000379:methods; D003692:Delayed-Action Preparations; D005079:Excipients / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D011208:Powders / Q000737:chemistry; D014885:Waxes / Q000737:chemistry*
chemical_list: D018712:Analgesics, Non-Narcotic; D003692:Delayed-Action Preparations; D005079:Excipients; D011208:Powders; D014885:Waxes; D000082:Acetaminophen; C026344:carnauba wax