| 
      
        | Parameters | Variations | Peak area | %RSD | Avg. %RSD | Rt (min.) | Capacity factor | Theoretical plate |  
        | Flow rate | ± 0.1ml/min | 239521 | 0.21 | 0.35 | 7.51 | 1.201 | 3425 |  
        | 235684 | 0.32 | 7.31 | 1.425 | 3375 |  
        | 228796 | 0.54 | 7.19 | 0.962 | 3412 |  
        | pH | ± 0.20 | 245231 | 0.46 | 0.48 | 7.23 | 1.623 | 3422 |  
        | 241124 | 0.51 | 7.14 | 0.711 | 3463 |  
        | Mobile phase | ± 2 ml methanol | 221124 | 0.31 | 0.29 | 7.12 | 1.322 | 3433 |  
        | 224565 | 0.27 | 7.54 | 1.121 | 3386 |  |