Stability of sodium bicarbonate solutions in polyolefin bags

June 2010
American Journal of Health-System Pharmacy;6/15/2010, Vol. 67 Issue 12, p1026
Academic Journal
Purpose. The stability of sodium bicarbonate solutions in sterile water for injection or 5% dextrose injection stored at 21-24 °C or 2-4 °C was evaluated. Methods. Sodium bicarbonate injection was obtained in 50-mL vials of 8.4% (1 meq/mL). A total of 50, 100, or 150 meq of sodium bicarbonate was added to each 1-L polyolefin bag of either sterile water for injection or 5% dextrose injection. All solutions were prepared in a laminar-airflow hood using aseptic technique. Bags were punctured once to remove headspace air and once for the addition of each 50 meq of sodium bicarbonate. Six replicates of each test solution were prepared. The solutions were stored at 21-24 °C and 2-4 °C. Control solutions (50 and 150 meq) were similarly prepared in triplicate. Control solutions were sparged with either nitrogen gas or oxygen gas before storage. Sodium bicarbonate stability was assessed by measuring solution pH. Bicarbonate content was measured utilizing titration. Both pH and bicarbonate concentrations were measured immediately upon preparation and on days 3, 5, and 7 for both test and control solutions. Results. All 95% confidence interval values for sample solution pH remained within 7.0-8.5 for seven days at 2-4 °C. Conclusion. Sodium bicarbonate solutions of 50, 100, and 150 meq in sterile water for injection or 5% dextrose injection were stable for up to seven days when refrigerated. The 50-meq solution was stable for up to 48 hours when stored at room temperature, and the 100- and 150-meq solutions were stable for up to 30 hours when stored at room temperature.


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