Methods
100 IU insulin was added to PP bags containing 100 ml of 0.9% NaCl solution(n = 6). The infusion was started at a rate of 2 ml/h using infusion sets in the PVC structure. Insulin quantification was performed in the samples taken both from the bag and from the end tip of the infusion set during infusion. The stability of insulin solutions stored at room (+24°C) and refrigerator (+4°C) temperatures were compared. Samples were analyzed using reverse-phase high-performance liquid chromatography.