Scintigraphic evaluation of a novel colon-targeted delivery system (CODES™) in healthy volunteers

✍ Scribed by Masataka Katsuma; Shunsuke Watanabe; Shigeo Takemura; Kazuhiro Sako; Toyohiro Sawada; Yoshinori Masuda; Katsutoshi Nakamura; Muneo Fukui; Alyson L. Connor; Ian R. Wilding

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 448 KB
• Volume: 93
• Category: Article
• ISSN: 0022-3549
• DOI: 10.1002/jps.20063

✦ Synopsis

The purposes of this study are to investigate the gastrointestinal transit and release properties of a novel, colon-targeted delivery system (CODES TM ) 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 TM , 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 TM started to disintegrate in the ascending colon in the majority of subjects at 7.11 AE 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 TM was almost comparable to that observed in the fasted state. Gamma scintigraphic studies clearly showed that CODES TM provides for rapid target site release in the colon regardless of the ingestion of food.