Abstract
A novel evodiamine (EVO)-phospholipid complex (EPLC) was designed to improve the bioavailability of EVO. A central composite design approach was employed for process optimization. EPLC were characterized by differential scanning calorimetry, ultraviolet spectroscopy, Fourier transformed infrared spectroscopy, 1H-NMR spectroscopy, matrix-assisted laser desorption/ionization time-of-flight spectroscopy, apparent solubility, and dissolution rate. After oral administration of EPLC, the concentrations of EVO at different time points were determined by high-performance liquid chromatography. The optimal formulation for EPLC was obtained where the values of X 1, X 2, and X 3 were 2, 0.5, and 2.5 mg/mL, respectively. The average particle size and zeta potential of EPLC with the optimized formulation were 246.1 nm and −26.94 mV, respectively. The EVO and phospholipids in the EPLC were associated with non-covalent interactions. The solubility of EPLC in water and the dissolution rate of EPLC in phosphate-buffered solution (pH 6.8) were substantially enhanced. The plasma EVO concentration-time curves of EPLC and free EVO were both in accordance with the two-compartment model. The peak concentration and AUC0−∞ of EPLC were increased, and the relative bioavailability was significantly increased to 218.82 % compared with that of EVO.
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ACKNOWLEDGMENTS
The authors wish to thank the National Natural Science Foundation of China (no. 30973645), Chongqing Natural Science Foundation (No. CSCT2012JJB10019), and Specialized Research Fund for the Doctoral Program of Higher Education (no. 20095503120008).
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Guest Editors: Michael Repka, Joseph Reo, Linda Felton, and Stephen Howard
Shan Liu is co-first author.
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Tan, Q., Liu, S., Chen, X. et al. Design and Evaluation of a Novel Evodiamine-Phospholipid Complex for Improved Oral Bioavailability. AAPS PharmSciTech 13, 534–547 (2012). https://doi.org/10.1208/s12249-012-9772-9
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DOI: https://doi.org/10.1208/s12249-012-9772-9