Preparation and evaluation of lyophilized liposome-encapsulated bufadienolides.
OBJECTIVE
The objective of this study was to prepare bufadienolides-loaded liposome (BU-lipo).


METHODS
The BU-lipo was prepared by a thin-film hydration method involving sonication and lyophilization procedures. The lyophilized BU-lipo was characterized with regard to the appearance and particle size by scanning electron microscopy, transmission electron microscopy, and photon correlation spectroscopy. The entrapment efficiency (EE) of BU-lipo was evaluated by the microdialysis technique.


RESULTS
In the optimal formulation, Lipoid E-80 and the mass ratio of cholesterol to lipid were fixed at 1.25% and 0.05. The media diameters of BU-lipo before and after lyophilization were about 100 nm, and the EEs of bufalin (B), cinobufagin (C), and resibufogenin (R) were 86.5%, 90.0%, and 92.1%, respectively. In the EE study, the probe recoveries of B, C, and R were 21.53 +/- 1.14%, 19.49 +/- 1.34%, and 20.19 +/- 1.25%, respectively, at a flow rate of 4 microL/min by the gain method. The EE of BU-lipo evaluated by microdialysis and ultrafiltration were equivalent.


CONCLUSIONS
The lyophilized BU-lipo contained trehalose (10%) was stable up to 6 months in a desiccator under 2 degrees C-8 degrees C. The microdialysis technique has a wide application perspective in the investigation of the free-drug concentration of microcarrier systems.
Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, PR China.
Fang
F
Li
Rui
R
Yang
Yan
Y
Weng
Xing
X
Tang
D000465:Algorithms; D002018:Bufanolides / Q000008:administration & dosage* / Q000737:chemistry*; D002138:Calibration; D002626:Chemistry, Pharmaceutical; D002784:Cholesterol / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D004337:Drug Carriers; D004339:Drug Compounding; D004355:Drug Stability; D005612:Freeze Drying; D006863:Hydrogen-Ion Concentration; D008081:Liposomes; D017551:Microdialysis; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D019999:Pharmaceutical Solutions; D012995:Solubility; D013056:Spectrophotometry, Ultraviolet; D013535:Suspensions; D014867:Water / Q000737:chemistry
D002018:Bufanolides; D004337:Drug Carriers; D008081:Liposomes; D019999:Pharmaceutical Solutions; D013535:Suspensions; D014867:Water; D002784:Cholesterol