title: Correlation of "in vitro" release and "in vivo" absorption characteristics of rifampicin from ethylcellulose coated nonpareil beads.
abstract: The purpose of this study was to investigate the possibility to develop different levels of correlation between in vitro dissolution parameters and in vivo pharmacokinetic parameters for three rifampicin formulations. A level A correlation of in vitro release and in vivo absorption could be obtained for individual plasma level data by means of the Wagner and Nelson method. Linear correlation could be obtained when percent dose released in vitro was plotted vs percent dose absorbed in vivo with correlation coefficients between 0.954,0.983 and 0.997 for the formulations studied. A second level correlation between mean in vitro dissolution time (MDT) and mean in vivo residence time (MRT) was performed with a correlation coefficient of 0.536,0.420 and 0.335. Finally, it was also possible to establish a good in vitro-in vivo correlation when the T(50%hrs) (time taken to release 50% of rifampicin) in vitro and C(max),T(max) or AUC in vivo were compared.
authors.affiliation: Department of Pharmaceutical Sciences, Andhra University, Visakhapatnam 530 003, Andhra Pradesh, India. bantupallis@rediffmail.com
authors.forename: B
authors.initials: B
authors.lastname: Sreenivasa Rao
authors.forename: A
authors.initials: A
authors.lastname: Seshasayana
authors.forename: S V
authors.initials: SV
authors.lastname: Pardha Saradhi
authors.forename: N
authors.initials: N
authors.lastname: Ravi Kumar
authors.forename: C P
authors.initials: CP
authors.lastname: Narayan
authors.forename: K V
authors.initials: KV
authors.lastname: Ramana Murthy
mesh_terms: D000042:Absorption; D000328:Adult; D000465:Algorithms; D000904:Antibiotics, Antitubercular / Q000008:administration & dosage / Q000737:chemistry / Q000493:pharmacokinetics*; D019540:Area Under Curve; D002482:Cellulose / Q000031:analogs & derivatives*; D006801:Humans; D008297:Male; D008863:Microspheres; D010316:Particle Size; D012293:Rifampin / Q000008:administration & dosage / Q000737:chemistry / Q000493:pharmacokinetics*; D012995:Solubility
chemical_list: D000904:Antibiotics, Antitubercular; C013517:ethyl cellulose; D002482:Cellulose; D012293:Rifampin