Table 1
Comparison of the influence of acetonitrile (ACN) concentration on chromatographic parameters
Retention time
Peak symmetry
ACN concentration in the mobile phase
Bupivacaine
Fentanyl
Bupivacaine
Fentanyl
20%
13.32
26.61
4.76
2.17
25%
11.83
20.86
4.21
1.96
30%
10.42
16.26
3.51
1.73
35%
10.36
15.98
3.34
1.66