Improved oral bioavailability of core-shell structured beads by redispersion of the shell-forming nanoparticles: preparation, characterization and in vivo studies.
In order to increase the dissolution rate and oral bioavailability of bifendate, coated beads with core-shell structure were prepared via a combination use of wet media milling method and bead layering process. Hydroxypropyl cellulose (HPC-SL) and sodium lauryl sulfate (SLS) were found to be the best pair to stabilize the nanosuspension during milling process. A 10:1 ratio of mixture of mannitol and SLS was chosen as most suitable coating matrix to maintain the redispersability of dried nanoparticles in the shell of beads. The mean particle size of the nanosuspension was 139 nm and the zeta potential was -20.2 mV. Nanoscale bifendate particles with a mean diameter of 360 nm could be generated when redispersing the prepared beads in water. The differential scanning calorimetry (DSC) and X-ray powder diffraction (XRPD) analysis indicated that the crystalline state of the drug was not changed. The stability test confirmed that coated beads showed no distinct difference in particle size and dissolution velocity during 6 month storage while liquid nanosuspension was stable no more than 3 weeks. Dissolution rate of coated beads was increased significantly compared with commercially available pills. Likewise, the Cmax and AUC (0→24) of nanosuspension based beads in beagle dogs were 2.40-fold and 1.66-fold greater than that of commercially available pills, respectively. The present work is a reliable approach to stabilize nanosuspension based product, and improve dissolution velocity and bioavailability of poor soluble drugs.
Department of Pharmaceutics, Shenyang Pharmaceutical University, Wen Hua Road No. 103, Shenyang 110016, China.
Qing
Q
Yao
Department of Pharmaceutics, Shenyang Pharmaceutical University, Wen Hua Road No. 103, Shenyang 110016, China.
Xiaoguang
X
Tao
Department of Pharmaceutics, Shenyang Pharmaceutical University, Wen Hua Road No. 103, Shenyang 110016, China.
Bin
B
Tian
School of Materials Science and Engineering, Xi'an Jiaotong University, China.
Yilin
Y
Tang
Department of Pharmaceutics, Shenyang Pharmaceutical University, Wen Hua Road No. 103, Shenyang 110016, China.
Yanjie
Y
Shao
Department of Pharmaceutics, Shenyang Pharmaceutical University, Wen Hua Road No. 103, Shenyang 110016, China.
Longfa
L
Kou
Department of Pharmaceutics, Shenyang Pharmaceutical University, Wen Hua Road No. 103, Shenyang 110016, China.
Jingxin
J
Gou
Department of Pharmaceutics, Shenyang Pharmaceutical University, Wen Hua Road No. 103, Shenyang 110016, China.
Xuechao
X
Li
Department of Pharmaceutics, Shenyang Pharmaceutical University, Wen Hua Road No. 103, Shenyang 110016, China.
Tian
T
Yin
Department of Pharmaceutics, Shenyang Pharmaceutical University, Wen Hua Road No. 103, Shenyang 110016, China. Electronic address: tangpharm@yahoo.com.cn.
Xing
X
Tang
D000284:Administration, Oral; D000818:Animals; D002152:Calorimetry, Differential Scanning; D004285:Dogs; D004339:Drug Compounding; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000008:administration & dosage / Q000737:chemistry* / Q000378:metabolism*; D014961:X-Ray Diffraction
Bead layering; Bifendate; Bioavailability; Nanosuspension; Redispersion; Wet media milling