From: Screening of caffeine, preservatives and antioxidants in dairy products available in Bangladesh using an RP-HPLC method
Time (min)
Diluted sulfuric acid (0.002 M) (%)
Acetonitrile (%)
0.01–10.00
85
15
10.01–11.00
40
60
11.01–13.00
30
70
13.01–16.00
20
80
16.01–18.00