Table 3
Influence of potassium chloride on chromatographic separation
Retention time
Peak symmetry
Mobile phase
Bupivacaine
Fentanyl
Bupivacaine
Fentanyl
30% ACN
10.15
15.46
3.51
1.73
30% ACN with 0.08 g/l KCl
9.77
15.10
3.38
1.70
ACN, acetonitrile.