['Ultrapure alginate gel is promising in terms of adhesion prevention. Because anti-adhesive barriers have been shown to disturb healing of bowel anastomoses, the effect of ultrapure alginate gel on the repair of colon anastomoses was studied.', 'In 102 male Wistar rats, a 0.5-cm segment was resected from the descending colon and continuity was restored by an inverted single-layer end-to-end anastomosis. Animals were randomized into a control, an alginate gel, and a sodium hyaluronate carboxymethyl cellulose film group, each n\xa0=\xa034. Half of each group was sacrificed at day 3 and 7 postoperatively. Anastomotic strength was assessed by measuring both bursting pressure and breaking strength. Hydroxyproline content was measured and histologic analysis was performed. The incidence of adhesion and abscess formation was scored at sacrifice.', 'No difference in either anastomotic-bursting pressure or breaking strength was found between experimental groups and the controls at any time point. Both the incidence of adhesion formation (35% versus 71%, P\xa0=\xa00.007) and the adhesion score (0.38 versus 0.79, P\xa0=\xa00.009) were significantly lower in the alginate gel group than in the controls. The abscess rate was higher (46% versus 18%, P\xa0=\xa00.030) in the hyaluronate carboxymethyl cellulose group than in the controls and unchanged in the alginate gel group.'] Does ultrapure alginate anti-adhesion gel impair colon anastomotic strength?