Considerable drops in liver glycogen contents of guinea pigs suffering from gangrenous intestinal obstruction were recorded in regard to control values (P less than 0.001). An additional experiment was conducted by using carbontetrachloride (CT) to determine whether or not the shortening of survival related to liver glycogen content in animals with strangulation obstruction. The mean tissue glycogen content in the sham-operated group was 816.2 +/- 13.3 micrograms/g, w. wt., whereas in the CT-treated group it was 73.5 +/- 11.0 micrograms/g w. wt. This difference is highly significant (P less than 0.001). The mean survival was 54.4 +/- 5.8 h and 21.9 +/- 5.5 h in animals with gangrenous intestinal obstruction before and after CT treatment, respectively. These results suggested that the liver glycogen depletion was a significant factor in decreasing the survival time of guinea pigs with strangulation obstruction.
Dexketoprofen trometamol (DT) is an active S (+) enantiomer of ketoprofen, and a non-steroidal antiinflammatory agent. DT has a short biological half-life and the dosing interval is quite short when there is a need to maintain the desirable effect for longer time periods. Consequently, a controlled release DT tablet was designed for oral administration aiming to minimize the number of doses and the possible side effects. Calculations of the parameters for controlled release DT tablets were shown clearly. Controlled release matrix-type tablet formulations were prepared using hydroxypropyl methylcellulose (HPMC) (low and high viscosity), Eudragit RS and Carbopol, and the effects of different polymers on DT release from the tablet formulations were investigated. The dissolution rate profiles were compared and analyzed kinetically. An Artificial Neural Network (ANN) model was developed to predict drug release and a successful model was obtained. Subsequently, an optimum formulation was selected and evaluated in terms of its analgesic and anti-inflammatory activity. Although the developed controlled release tablets did not have an initial dose, they were found to be as effective as commercially available tablets on the market. Dissolution and in vivo studies have shown that the prepared tablets were able to release DT for longer time periods, making the tablets more effective, convenient and more tolerable.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.