The gastrointestinal distribution profiles for three C-14-labelled poly(acr
ylic acid)s of different average molecular weights and degrees of cross-lin
king have been established using the rat model. Despite initial differences
in transit times and retention characteristics, these structural features
were found to be of little influence to the overall gastrointestinal transi
t of the materials under consideration. No evidence for the systemic absorp
tion of any of the polymers could be identified. (C) 2001 Elsevier Science
Ltd. All rights reserved.