Picture of person typing on laptop with programming code visible on the laptop screen

World class computing and information science research at Strathclyde...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

The Department also includes the iSchool Research Group, which performs leading research into socio-technical phenomena and topics such as information retrieval and information seeking behaviour.

Explore

Scintigraphic evaluation of colon targeting pectin-HPMC tablets in healthy volunteers

Hodges, L.A. and Connolly, S.M. and Band, J. and O'Mahony, B. and Ugurlu, T. and Turkoglu, M. and Wilson, C.G. and Stevens, H.N.E. (2009) Scintigraphic evaluation of colon targeting pectin-HPMC tablets in healthy volunteers. International Journal of Pharmaceutics, 370 (1-2). pp. 144-150. ISSN 0378-5173

Full text not available in this repository. Request a copy from the Strathclyde author

Abstract

The in vivo evaluation of colon-targeting tablets was conducted in six healthy male volunteers. A pectin-hydroxypropyl methylcellulose coating was compressed onto core tablets labelled with 4 MBq 99mTc-DTPA. The tablets released in the colon in all subjects; three in the ascending colon (AC) and three in the transverse colon (TC). Tablets that released in the TC had reached the AC before or just after food (Group A). The other three tablets released immediately upon AC entry at least 1.5 h post-meal (Group B). Release onset for Group B was earlier than Group A (343 min vs 448 min). Group B tablets exhibited a clear residence period at the ileocaecal junction (ICJ) which was not observed in Group A. Prolonged residence at the ICJ is assumed to have increased hydration of the hydrogel layer surrounding the core tablet. Forces applied as the tablets progressed through the ICJ may have disrupted the hydrogel layer sufficiently to initiate radiolabel release. Conversely, Group A tablets moved rapidly through the AC to the TC, possibly minimising contact times with water pockets. Inadequate prior hydration of the hydrogel layer preventing access of pectinolytic enzymes and reduced fluid availability in the TC may have retarded tablet disintegration and radiolabel diffusion.