title: Shear rheology and in-vitro release kinetic study of apigenin from lyotropic liquid crystal.
abstract: Apigenin is a flavonoid compound with diverse pharmacological functions which could develop health benefit products, but its formulation is hampered by its poor water solubility and bioavailability. In this paper, in order to overcome these difficulties, apigenin was encapsulated in LLC formed by polyoxyethylene-10-oleyl ether (Brij 97) and sodium deoxycholate (NaDC) mixtures. The hexagonal liquid crystalline phase (H) and the cubic liquid crystalline phase (C) were found in this system. The shear rheology was used to study the structure change with temperature. It was shown that C3 (Brij 97-NaDC/IPM-PEG400/H2O=36:9:55) was C at low temperature. But above 35.6°C, the matrix of C3 completely transformed to polymer solution. The matrix of H3 was H (Brij 97-NaDC:IPM-PEG 400:H2O=50:9:41) below 50°C, but the structural strength change was obvious. Vitro release experiment was used to study drug release kinetics. It was indicated that apigenin encapsulated in LLC conformed to the concentration diffusion model, and cumulative percentage of apigenin released from C3 and H3 had corresponding relationship with the shear rheology at different temperatures.
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Jinan 250014, PR China.
authors.forename: Jun
authors.initials: J
authors.lastname: Fan
authors.affiliation: Key Laboratory of TCM Quality Control Technology, Shandong Analysis and Test Center, Jinan, PR China.
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Jinan 250014, PR China. Electronic address: zhongniw@163.com.
authors.forename: Zhongni
authors.initials: Z
authors.lastname: Wang
mesh_terms: D047310:Apigenin / Q000032:analysis* / Q000737:chemistry; D003840:Deoxycholic Acid / Q000737:chemistry*; D065546:Drug Liberation; D007700:Kinetics; D050866:Liquid Crystals / Q000737:chemistry*; D008956:Models, Chemical; D011092:Polyethylene Glycols / Q000737:chemistry*; D012212:Rheology; D012995:Solubility; D013696:Temperature
chemical_list: C478746:polyoxyethylene-10-oleyl ether; D003840:Deoxycholic Acid; D011092:Polyethylene Glycols; D047310:Apigenin
keywords: Apigenin; Apigenin (PubChem CID: 5280443); Isopropyl myristate (PubChem CID: 8032); Lyotropic liquid crystal; Rheology; Sodium deoxycholate (PubChem CID:23668196); Vitro release