title: Improvement of absorption enhancing effects of n-dodecyl-beta-D-maltopyranoside by its colon-specific delivery using chitosan capsules.
abstract: In general, absorption enhancing effects of various absorption enhancers were greater in the large intestine than those in the small intestinal regions. Therefore, the effectiveness of absorption enhancers is expected to be remarkably observed, if these enhancers can be delivered to the large intestine with some poorly absorbable drugs after oral administration. In this study, therefore, we examined whether chitosan capsules were effective for the colon-specific delivery of a certain absorption enhancer and can improve the absorption enhancing action of the absorption enhancer after oral administration. 5(6)-Carboxyfluorescein (CF) was used as a model drug to investigate the site-dependent effectiveness of various absorption enhancers by an in situ closed loop method. Sodium glycocholate (NaGC), n-dodecyl-beta-d-maltopyranoside (LM), sodium salicylate (NaSal) and sodium caprate (NaCap) were used as models of absorption enhancers in this study. Overall, the absorption enhancing effects of these enhancers for intestinal absorption of CF were greater in the colon than those in the jejunum and the ileum. Especially, among these enhancers tested in this study, LM showed much greater absorption enhancing effect in the colon than in the jejunum and the ileum. Therefore, LM was selected as a model absorption enhancer to examine the effect of chitosan capsules on the absorption enhancing effect of LM. When CF and LM were orally administered to rats using chitosan capsules, the plasma concentration of CF was much higher than those in other dosage forms including solution and gelatin capsules. Therefore, chitosan capsules may be useful carriers for colon-specific delivery of LM, thereby increasing its absorption enhancing effect from the intestinal membranes.
authors.affiliation: Department of Biopharmaceutics, Kyoto Pharmaceutical University, Kyoto, Japan.
authors.forename: Gihan
authors.initials: G
authors.lastname: Fetih
authors.forename: Sara
authors.initials: S
authors.lastname: Lindberg
authors.forename: Katsuhito
authors.initials: K
authors.lastname: Itoh
authors.forename: Naoki
authors.initials: N
authors.lastname: Okada
authors.forename: Takuya
authors.initials: T
authors.lastname: Fujita
authors.forename: Fawsia
authors.initials: F
authors.lastname: Habib
authors.forename: Per
authors.initials: P
authors.lastname: Artersson
authors.forename: Mohammed
authors.initials: M
authors.lastname: Attia
authors.forename: Akira
authors.initials: A
authors.lastname: Yamamoto
mesh_terms: D000818:Animals; D002214:Capsules; D048271:Chitosan / Q000008:administration & dosage / Q000493:pharmacokinetics*; D003106:Colon / Q000187:drug effects / Q000378:metabolism*; D016503:Drug Delivery Systems / Q000379:methods*; D007408:Intestinal Absorption / Q000187:drug effects / Q000502:physiology*; D008297:Male; D008320:Maltose / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000493:pharmacokinetics*; D051381:Rats; D017208:Rats, Wistar
chemical_list: D002214:Capsules; C411362:dodecyl maltopyranoside; D008320:Maltose; D048271:Chitosan