Objective To establish a method for the determination of contents of sodium metabisulfite and sodium sulfate in phentolamine mesylate injection.
Methods The ion chromatography method with a DionexIonPac AS11-HC (250 mm×4.0 mm, 5 µm) column was used, with potassium hydroxide solution as eluent, gradient elution, flow rate of 1.0 mL/ min. The column temperature was 30 ℃ and the injection volume was 25 µL.
Results Sodium metabisulfite showed good linearity (r=0.999 3) in the range of 10.596-211.920 µg/mL, and its average recovery rate was 100.00%, with an RSD of 1.4% (n=9). Sodium sulfate showed good linearity (r=0.999 8) in the range of 1.027-20.540 μg/mL, and its average recovery rate was 99.96%, with an RSD of 1.8% (n=9).
Conclusion The established method is simple, accurate, sensitive and suitable for the determination of sodium metabisulfite and sodium sulfate contents in phentolamine methylate injection.
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