title: [Optimization of microemulsion containing vinpocetine and its physicochemical properties].
abstract: OBJECTIVE
  To prepare the microemulsion of vinpocetine in order to increase solubility and its in vitro transdermal delivery by using appropriate proportion of oil, surfactant (S), cosurfactant (CoS) and water. The formulation of proportion was optimized. The physicochemical properties and the skin irritation of the microemulsion was studied.
  
  
  METHODS
  Pseudo-tertiary phase diagrams were prepared to obtain the concentration ratio of components of the microemulsion. Using simplex lattice method, the formulation of microemulsion was optimized and the physicochemical properties including pH, viscosity, refractive index, conductivity and particle size distribution were examined. The MTT method was applied to test the skin irritation of the microemulsion on the Hacat cell.
  
  
  RESULTS
  The diagrams showed that the areas of O/W microemulsion increased with the increasing ratio of surfactant to cosurfactant (S/CoS). The predicted values from simplex lattice system were close to that of the experiment. The property of optimized microemulsion showed to be stable behavior and not irritant to Hacat cell.
  
  
  CONCLUSIONS
  The drug solubility and in vitro perscutaneous permeation flux of the optimized microemulsion was improved significantly and the irritation study showed that optimized microemulsion was safe as an ideal transdermal delivery system.
authors.affiliation: Department of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Li
authors.forename: Wei-san
authors.initials: WS
authors.lastname: Pan
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wu
authors.forename: Jia-yu
authors.initials: JY
authors.lastname: Li
authors.forename: Li-xin
authors.initials: LX
authors.lastname: Xia
mesh_terms: D000279:Administration, Cutaneous; D000818:Animals; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D004339:Drug Compounding; D004355:Drug Stability; D004655:Emulsions / Q000737:chemistry; D005079:Excipients / Q000737:chemistry; D008297:Male; D018696:Neuroprotective Agents / Q000008:administration & dosage / Q000737:chemistry* / Q000493:pharmacokinetics; D011092:Polyethylene Glycols / Q000737:chemistry; D051381:Rats; D017208:Rats, Wistar; D012867:Skin / Q000166:cytology; D012869:Skin Absorption; D012995:Solubility; D013501:Surface-Active Agents / Q000737:chemistry; D014748:Vinca Alkaloids / Q000008:administration & dosage / Q000737:chemistry* / Q000493:pharmacokinetics
chemical_list: D004655:Emulsions; D005079:Excipients; D018696:Neuroprotective Agents; D013501:Surface-Active Agents; D014748:Vinca Alkaloids; C022131:cremophor; D011092:Polyethylene Glycols; C013983:vinpocetine