From: Validated HPLC–PDA methodology utilized for simultaneous determination of Etoricoxib and Paracetamol in the presence of Paracetamol toxic impurities
Time, min
Phosphate buffer, %
Acetonitrile, %
0 a
93
7
0–2.5
75
25
2.5–5
50
5–7.5
7.5–9.5