title: [Preparation and release characterization in vitro of pulsed-release tablets of compound Danshen].
abstract: OBJECTIVE
  To prepare pulsed-release tablet (PTS) according to the rhythm of coronary heart disease based on efficacy material and the mechanism of compound Danshen.
  
  
  METHODS
  PTS were achieved by coating the core which contains drugs, CMS-Na, lactose, succinic acid and MCC with separation layer (Eudragit RL), swelling layer (HPMC E5), and controlled-release membrane (Eudragit RS-RL-EC).
  
  
  RESULTS
  The results of in vitro experiments showed that no difference was observed among the profiles of Danshensu, protocatechuic aldehyde, ginsenoside Rg1, Rb1, notoginsenoside R1 release from the two-step release system. And it indicated that swelling was the basis and prerequisite for drug release from PTS, and the diffusion, organic acid-induced, and osmotic pumping mechanism were involved in drug release, but the latter they were the dominant factors.
  
  
  CONCLUSIONS
  Successfully obtained the PTS of a certain lag-time behind the rapid release which indicate that after bed time administration of such device, the drug plasma concentration-time curve CAN meet the requirements of chronotherapy of cardiovascular disease.
authors.affiliation: Hairong Yangtze River Pharmaceutical Group of Sichuan Pharmaceutical Co., Ltd, Dujiangyan 611830, China.
authors.forename: Yuanbo
authors.initials: Y
authors.lastname: Li
authors.forename: Lian
authors.initials: L
authors.lastname: Xue
authors.forename: Jianhu
authors.initials: J
authors.lastname: Yin
authors.forename: Xilin
authors.initials: X
authors.lastname: Peng
authors.forename: Shixiang
authors.initials: S
authors.lastname: Hou
mesh_terms: D001547:Benzaldehydes / Q000378:metabolism; D002396:Catechols / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D003327:Coronary Disease / Q000188:drug therapy; D004058:Diffusion; D004339:Drug Compounding / Q000379:methods*; D016503:Drug Delivery Systems; D004365:Drugs, Chinese Herbal / Q000008:administration & dosage* / Q000737:chemistry / Q000378:metabolism / Q000627:therapeutic use; D036145:Ginsenosides / Q000378:metabolism; D009995:Osmosis; D027561:Salvia miltiorrhiza / Q000737:chemistry*; D013607:Tablets; D013997:Time Factors
chemical_list: D001547:Benzaldehydes; D002396:Catechols; D004365:Drugs, Chinese Herbal; D036145:Ginsenosides; D013607:Tablets; C005581:protocatechualdehyde