Research Article
Development and Validation of an HPLC Method for Simultaneous Assay of Potassium Guaiacolsulfonate and Sodium Benzoate in Pediatric Oral Powder
Table 7
Results of system precision for sodium benzoate.
| | No. of injection | Retention time of sodium benzoate (minutes) | Peak area (mAu·s) | Asymmetry of peak | Number of theoretical plates | Resolution |
| | 1 | 12.340 | 1905008 | 0.99 | 27071 | 14.0 | | 2 | 12.386 | 1906997 | 0.99 | 27273 | 14.1 | | 3 | 12.416 | 1906631 | 0.99 | 27405 | 14.2 | | 4 | 12.344 | 1904799 | 0.98 | 27088 | 14.1 | | 5 | 12.291 | 1905328 | 0.98 | 26856 | 14.0 | | 6 | 12.334 | 1905038 | 0.99 | 27044 | 14.2 | | Average | 12.352 | 1905634 | 0.99 | 27123 | 14.1 | | RSD (%) | 0.4 | 0.1 | 0.5 | 0.7 | 0.6 |
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