title: [Study on pharmaceutical characterization and pharmacokinetics of daunorubicin long-circulating liposomes in rat].
abstract: OBJECTIVE
  To study the pharmaceutical characterization and pharmacokinetics of long-circulating liposomes containing daunorubicin.
  
  
  METHODS
  The morphology of daunorubicin long-circulating liposome was surveyed under the transmission electron microscope. The size of daunorubicin long-circulating liposomes was determined by laser scatter method. The entrapment efficiency and accelerative experiment stability of the daunorubicin long-circulating liposomes were examined. Visible spectrophotometry and the HPLC method were established for determination of the daunorubicin in the long-circulating liposomes. The percent release of daunorubicin from long-circulating liposomes in HBS (pH 7.5) and rat serum at 37 degrees C were examined. The pharmacokinetics in rats were studied.
  
  
  RESULTS
  The high entrapment efficiency (> 85%) and stabilized long-circulating liposomes could be achieved. The drug was slowly released from the daunorubicin long-circulating liposomes. The drug released from liposomes was less than 10% in 24 h. The T1/2 alpha and AUC of long-circulating liposome were higher than those in injections.
  
  
  CONCLUSIONS
  The long-circulating liposomes prepared by us have high encapsulation efficiency and the pharmaceutical characterization showed good stability, they can be used for clinical purpose.
authors.affiliation: Department of Pharmaceutics, School of Pharmaceutical Sciences, Peking University, Beijing 100083, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang
authors.forename: Xian-rong
authors.initials: XR
authors.lastname: Qi
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhang
mesh_terms: D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000008:administration & dosage* / Q000493:pharmacokinetics*; D003630:Daunorubicin / Q000008:administration & dosage* / Q000493:pharmacokinetics*; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D008081:Liposomes; D008297:Male; D010714:Phosphatidylethanolamines; D011092:Polyethylene Glycols / Q000737:chemistry; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar
chemical_list: D000903:Antibiotics, Antineoplastic; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D008081:Liposomes; D010714:Phosphatidylethanolamines; C038089:1,2-distearoylphosphatidylethanolamine; D011092:Polyethylene Glycols; D003630:Daunorubicin