Characterization and in vivo evaluation of an inclusion complex of oridonin and 2-hydroxypropyl-beta-cyclodextrin.
Oridonin, a diterpenoid, is a sparingly soluble compound and its aqueous solubility can't meet the requirement of clinical intravenous administration. This study was, accordingly, to prepare an inclusion complex of oridonin and 2-hydroxypropyl-beta-cyclodextrin (HP-beta-CD) by lyophilization to improve its apparent solubility. The solubility enhancement of oridonin was evaluated by phase solubility method, and the phase solubility curve displayed a typical A(L)-type, indicating the formation of 1:1 inclusion complex. The formation of inclusion complex was confirmed by DSC, XRD, FTIR, and NMR, and thereby two possible inclusion modes were inferred. In vivo studies demonstrated that HP-beta-CD had no significant effect on the plasma pharmacokinetic behaviors of oridonin following i.v. administration to rats, but the inclusion complex tended to decrease the distribution of oridonin in heart, spleen, and kidney and increase that in lung in mice, compared to that of free drug.
Yan
Zhiqiang
Z
Department of Biopharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, People's Republic of China.
Xu
Wen
W
Sun
Jin
J
Liu
Xiaohong
X
Zhao
Yanping
Y
Sun
Yinghua
Y
Zhang
Tianhong
T
He
Zhonggui
Z
D000073738:2-Hydroxypropyl-beta-cyclodextrin; D000818:Animals; D019540:Area Under Curve; D001682:Biological Availability; D002152:Calorimetry, Differential Scanning; D002626:Chemistry, Pharmaceutical; D045786:Diterpenes, Kaurane / Q000097:blood / Q000737:chemistry* / Q000493:pharmacokinetics*; D005079:Excipients / Q000737:chemistry*; D005612:Freeze Drying; D007275:Injections, Intravenous; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D051379:Mice; D051381:Rats; D017208:Rats, Wistar; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared; D014018:Tissue Distribution; D014961:X-Ray Diffraction; D047392:beta-Cyclodextrins / Q000737:chemistry*
D045786:Diterpenes, Kaurane; D005079:Excipients; D047392:beta-Cyclodextrins; C011959:oridonin; D000073738:2-Hydroxypropyl-beta-cyclodextrin