To what extent do the storage conditions of polyether‐based polyurethane have an impact on diazepam delivery?

Abstract

Interactions between medical device material and the drug itself have been evoked for polyurethane and may lead to underdosing. Polyurethane, sterilization mode, and the crosslinking level of the polymer have an influence on sorption. The aim here is to evaluate the impact of polyurethane conservation time and conditions as well as sterilization mode. Two polyurethane extension tubes were tested, one sterilized by ethylene oxide and the second by gamma radiation. Forced degradation experiments were performed. After 3 and 6 months of incubation, thermal properties, diazepam delivery and cytotoxicity of leachates were assessed. Diazepam delivery differs significantly according to the version of polyurethane. Sterilization however has no impact on diazepam delivery. No cytotoxicity was observed whatever the infusion tube and the aging conditions. In conclusion, sterilization procedures do not induce polyurethane degradation, but high temperature/relative humidity/time storage conditions lead to a slight degradation in polyurethane.

Structure and properties of bio‐based polyurethane coatings for controlled‐release fertilizer

“…It can be seen that there emerges a distinct endothermic peak at 58°C both curves of Castor‐PU and Starch‐PU coatings, which is due to the abrupt change of specific heat capacity of PU coatings, corresponding to the glass transition temperature ( T g ) 22,23 . In contrast to Starch‐PU coatings, one more endothermic peak was observed clearly at 132°C on the DSC curves of Castor‐PU, indicating the formation of certain crystalline microdomain in its aggregated structure 24,25 . The crystalline structure of the above two coatings was studied by XRD in Figure 5b.…”