title: [Preparation of Shuxiong pulsatile controlled-release dropping pill].
abstract: OBJECTIVE
  To prepare Shuxiong pulsatile controlled-release dropping pill and study the influencing factors in vitro.
  
  
  METHODS
  Dropping pills with suitable size (10 - 15 mg) were coated with swelling layer containing croscarmellose sodium and controlled-release layer containing ethylcellulos aqueous dispersion respectively to prepare Shuxiong pulsatile controlled-release dropping pill. The effects of the materials of swelling layer, the weight of swelling layer and controlled-release layer on the release of drugs were investigated to optimize the process technology and validate formula.
  
  
  RESULTS
  The release behavior was influenced strikingly by the types and weight of coating layer. The optimal formula was as follows: Shuxiong pulsatile controlled-release dropping pills were prepared using croscarmellose sodium as inner layer with 15% (weight) coating level and ethylcellulose aqueous dispersion (Surelease) as outer controlled-release layer with 7% (weight) coating level. The lag time of prepared pulsatile controlled-release dropping pills was about 4 h and accumulative release rate reached 80% within 4 h.
  
  
  CONCLUSIONS
  The drug release of Shuxiong pulsatile controlled-release dropping pill is shown in pulsatile way in vitro.
authors.affiliation: Institute of Material Medica/Guangdong Provinical Key Laboratory of Advanced Drug Delivery, Guangdong Pharmaceutical University, Guangzhou 510006, China. chenhuicherry1987@163.com
authors.forename: Hui
authors.initials: H
authors.lastname: Chen
authors.affiliation: Institute of Material Medica/Guangdong Provinical Key Laboratory of Advanced Drug Delivery, Guangdong Pharmaceutical University, Guangzhou 510006, China.
authors.forename: Yan-Zhong
authors.initials: YZ
authors.lastname: Chen
authors.affiliation: Institute of Material Medica/Guangdong Provinical Key Laboratory of Advanced Drug Delivery, Guangdong Pharmaceutical University, Guangzhou 510006, China.
authors.forename: Qing-Chun
authors.initials: QC
authors.lastname: Xie
authors.affiliation: Institute of Material Medica/Guangdong Provinical Key Laboratory of Advanced Drug Delivery, Guangdong Pharmaceutical University, Guangzhou 510006, China.
authors.forename: Shi-Yuan
authors.initials: SY
authors.lastname: Lin
authors.affiliation: Institute of Material Medica/Guangdong Provinical Key Laboratory of Advanced Drug Delivery, Guangdong Pharmaceutical University, Guangzhou 510006, China.
authors.forename: Jia-Cheng
authors.initials: JC
authors.lastname: Lin
authors.affiliation: Institute of Material Medica/Guangdong Provinical Key Laboratory of Advanced Drug Delivery, Guangdong Pharmaceutical University, Guangzhou 510006, China.
authors.forename: Wei-Ning
authors.initials: WN
authors.lastname: Jianc
mesh_terms: D002266:Carboxymethylcellulose Sodium / Q000737:chemistry; D002482:Cellulose / Q000031:analogs & derivatives / Q000737:chemistry; D003692:Delayed-Action Preparations / Q000737:chemistry*; D004339:Drug Compounding / Q000379:methods*; D004365:Drugs, Chinese Herbal / Q000008:administration & dosage* / Q000737:chemistry / Q000493:pharmacokinetics; D006863:Hydrogen-Ion Concentration; D010946:Plants, Medicinal / Q000737:chemistry; D011205:Povidone / Q000737:chemistry; D012503:Saponins / Q000032:analysis; D013607:Tablets
chemical_list: D003692:Delayed-Action Preparations; D004365:Drugs, Chinese Herbal; D012503:Saponins; D013607:Tablets; C013517:ethyl cellulose; D002482:Cellulose; D011205:Povidone; D002266:Carboxymethylcellulose Sodium