title: Improvement in oral bioavailability and dissolution of tanshinone IIA by preparation of solid dispersions with porous silica.
abstract: OBJECTIVE
  This study aims to evaluate the oral bioavailability and dissolution of tanshinone IIA (tanIIA) by preparation of solid dispersions (SDs) with porous silica.
  
  
  METHODS
  SDs of tanIIA were prepared using a solvent method. The physicochemical properties, dissolution property, drug stability and in-vivo performance of the SDs prepared were all evaluated.
  
  
  RESULTS
  Compared with tanIIA alone and corresponding physical mixtures, tanIIA from SDs showed remarkably improved in-vitro dissolution rate. After forming the SDs, tanIIA changed into an amorphous state, which can infer from differential scanning calorimetry (DSC) and X-ray powder diffraction (XRPD). Fourier transform infrared spectroscopy (FTIR) also revealed the presence of interactions between tanIIA and porous silica in SDs. During the stability study, there is no significant decreasing in either the in-vitro dissolution or the drug content, which was observed following storage at room temperature for 12 months. The results of a pharmacokinetic study in rats showed the areas under the concentration-time curve from 0 h to 24 h (AUC0-24h ) for the SDs and tanIIA were 1019.87 ± 161.819 mg/h per litre and 343.70 ± 75.628 mg/h per litre, respectively.
  
  
  CONCLUSIONS
  SDs with porous silica as carrier could achieve superior oral bioavailability by improving drug dissolution, whereas drug stability could be maintained.
authors.affiliation: Key Laboratory of New Drug Delivery System of Chinese Materia Medica, Jiangsu Provincial Academy of Chinese Medicine, Nanjing University of Chinese Medicine, Nanjing, Jiangsu, China.|College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, Jiangsu, China.
authors.forename: Hong-mei
authors.initials: HM
authors.lastname: Yan
authors.affiliation: College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, Jiangsu, China.
authors.forename: E
authors.initials: E
authors.lastname: Sun
authors.affiliation: College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, Jiangsu, China.
authors.forename: Li
authors.initials: L
authors.lastname: Cui
authors.affiliation: Key Laboratory of New Drug Delivery System of Chinese Materia Medica, Jiangsu Provincial Academy of Chinese Medicine, Nanjing University of Chinese Medicine, Nanjing, Jiangsu, China.|College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, Jiangsu, China.
authors.forename: Xiao-bin
authors.initials: XB
authors.lastname: Jia
authors.affiliation: Key Laboratory of New Drug Delivery System of Chinese Materia Medica, Jiangsu Provincial Academy of Chinese Medicine, Nanjing University of Chinese Medicine, Nanjing, Jiangsu, China.|Department of pharmacy, Suqian First Hospital, Suqian, Jiangsu, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Jin
mesh_terms: D045784:Abietanes / Q000737:chemistry* / Q000493:pharmacokinetics*; D000818:Animals; D001682:Biological Availability; D002152:Calorimetry, Differential Scanning / Q000379:methods; D004355:Drug Stability; D008297:Male; D016062:Porosity; D011208:Powders / Q000737:chemistry; D051381:Rats; D017207:Rats, Sprague-Dawley; D012822:Silicon Dioxide / Q000737:chemistry*; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D014961:X-Ray Diffraction / Q000379:methods
chemical_list: D045784:Abietanes; D011208:Powders; C021751:tanshinone; D012822:Silicon Dioxide
keywords: in-vitro dissolution; oral bioavailability; porous silica; solid dispersions; tanshinone IIA