title: Enhanced oral absorption of paclitaxel in N-deoxycholic acid-N, O-hydroxyethyl chitosan micellar system.
abstract: The overall goal of this study was to develop a micellar system of paclitaxel (PTX) to enhance its oral absorption. An amphiphilic chitosan derivative, N-deoxycholic acid-N, O-hydroxyethyl chitosan (DHC), was synthesized and characterized by FTIR, (1)H NMR, elemental analysis, and X-ray diffraction (XRD) techniques. The degree of substitution (DS) of hydroxyethyl group and deoxycholic acid group ranged from 89.5-114.5% and 1.11-8.17%, respectively. The critical micelle concentration (CMC) values of DHC decreased from 0.26 to 0.16 mg/mL as the DS of deoxycholic acid group increased. PTX was successfully loaded in DHC micelles with a high drug loading (31.68 ± 0.14%) and entrapment efficiency (77.57 ± 0.51%). The particle size of PTX-loaded DHC micelles ranged from 203.35 ± 2.19 to 236.70 ± 3.40 nm as the DS of deoxycholic acid group increased. After orally administration of PTX-loaded DHC micelles, the bioavailability was threefold compared with that of an orally dosed Taxol®. The single-pass intestinal perfusion studies (SPIP) showed that the intestinal absorption of micelles was via endocytosis involving a saturable process and a p-glycoprotein (P-gp)-independent way. All these indicated that the DHC micelles might be a promising tool for oral delivery of poorly water-soluble drugs.
authors.affiliation: Faculty of Pharmacy, Department of Pharmaceutics, China Pharmaceutical University, Nanjing 210009, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Li
authors.forename: Meirong
authors.initials: M
authors.lastname: Huo
authors.forename: Jianping
authors.initials: J
authors.lastname: Zhou
authors.forename: Yindi
authors.initials: Y
authors.lastname: Dai
authors.forename: Yaping
authors.initials: Y
authors.lastname: Deng
authors.forename: Xiangjie
authors.initials: X
authors.lastname: Shi
authors.forename: Jumah
authors.initials: J
authors.lastname: Masoud
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000378:metabolism; D000284:Administration, Oral; D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000008:administration & dosage* / Q000493:pharmacokinetics*; D048271:Chitosan / Q000737:chemistry*; D003840:Deoxycholic Acid / Q000737:chemistry*; D004337:Drug Carriers / Q000737:chemistry; D007408:Intestinal Absorption; D008823:Micelles; D017239:Paclitaxel / Q000008:administration & dosage* / Q000493:pharmacokinetics*; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000972:Antineoplastic Agents, Phytogenic; D004337:Drug Carriers; D008823:Micelles; D003840:Deoxycholic Acid; D048271:Chitosan; D017239:Paclitaxel