title: [Study on the release mechanism of fenoprofen calcium from hydrophillic sustained-release matrix].
abstract: OBJECTIVE
  To study the release mechanism of fenoprofen calcium (FC) from hydroxypropylmethylcellulose (HPMC) matrices.
  
  
  METHODS
  The release of FC and the erosion properties of hydrophillic matrices containing HPMC was examined at different paddle speed. The release mechanism of FC was further confirmed by evaluating the n value in Peppas equation.
  
  
  RESULTS
  The results indicate that the release of FC and the erosion of matrices exhibit zero order kinetic equation, and it exhibits line relationship between them.
  
  
  CONCLUSIONS
  In the first 40 min, FC mainly released by diffusion and erosion from HPMC matrix, while it was controlled by the rate of tablet erosion after 50 min.
authors.affiliation: Department of Pharmaceutics, Shenyang Pharmaceutical University, Shenyang 110015, China. zhaocs@hotmail.com
authors.forename: C S
authors.initials: CS
authors.lastname: Zhao
authors.forename: Z G
authors.initials: ZG
authors.lastname: He
authors.forename: S M
authors.initials: SM
authors.lastname: Cui
authors.forename: X
authors.initials: X
authors.lastname: Tang
authors.forename: R H
authors.initials: RH
authors.lastname: Zhang
mesh_terms: D003692:Delayed-Action Preparations / Q000737:chemistry; D005279:Fenoprofen / Q000737:chemistry*; D065347:Hypromellose Derivatives; D008747:Methylcellulose / Q000031:analogs & derivatives* / Q000737:chemistry
chemical_list: D003692:Delayed-Action Preparations; D065347:Hypromellose Derivatives; D008747:Methylcellulose; D005279:Fenoprofen