title: Scintigraphic evaluation of a novel colon-targeted delivery system (CODES) in healthy volunteers.
abstract: The purposes of this study are to investigate the gastrointestinal transit and release properties of a novel, colon-targeted delivery system (CODES) administered to healthy volunteers using gamma scintigraphy and to confirm that lactulose functions to promote disintegration in the colon. Two placebo formulations were studied: one was CODES, which consisted of a lactulose containing core overcoated with both Eudragit E and Eudragit L designed to rapidly disintegrate in the colon, the other was lactulose-free reference formulation (LFRF) that consisted of lactulose-free tablet core overcoated with the same materials. Transit and disintegration of the radiolabeled formulations were followed by gamma scintigraphy. In the fasted state, scintigraphic images indicated that CODES started to disintegrate in the ascending colon in the majority of subjects at 7.11 +/- 2.01 h post-dose. Disintegration was complete within 1 h following commencement of in vivo release. In contrast, LFRF presented with prolonged in vivo disintegration properties. In the fed state, the disintegration period of CODES was almost comparable to that observed in the fasted state. Gamma scintigraphic studies clearly showed that CODES provides for rapid target site release in the colon regardless of the ingestion of food.
authors.affiliation: DDS Research, Novel Pharmaceutical Laboratories, Yamanouchi Pharmaceutical Co., Ltd., 180 Ozumi, Yaizu-shi, Shizuoka-ken 425-0072, Japan. katsuma@yamanouchi.co.jp
authors.forename: Masataka
authors.initials: M
authors.lastname: Katsuma
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Watanabe
authors.forename: Shigeo
authors.initials: S
authors.lastname: Takemura
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Sako
authors.forename: Toyohiro
authors.initials: T
authors.lastname: Sawada
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Masuda
authors.forename: Katsutoshi
authors.initials: K
authors.lastname: Nakamura
authors.forename: Muneo
authors.initials: M
authors.lastname: Fukui
authors.forename: Alyson L
authors.initials: AL
authors.lastname: Connor
authors.forename: Ian R
authors.initials: IR
authors.lastname: Wilding
mesh_terms: D000328:Adult; D002626:Chemistry, Pharmaceutical; D003106:Colon / Q000000981:diagnostic imaging* / Q000187:drug effects / Q000378:metabolism*; D018592:Cross-Over Studies; D016503:Drug Delivery Systems / Q000379:methods*; D005215:Fasting / Q000378:metabolism; D005720:Gamma Rays; D005746:Gastric Emptying / Q000187:drug effects / Q000502:physiology; D005772:Gastrointestinal Transit / Q000502:physiology; D006801:Humans; D007792:Lactulose / Q000008:administration & dosage / Q000493:pharmacokinetics; D008297:Male; D011877:Radionuclide Imaging
chemical_list: D007792:Lactulose