Table 1.

Gradient elution program for biogenic amine analysis.

Time program/min	A:10 mmol/L Ammonium acetate/%	B: Acetonitrile/%
0	40	60
5	40	60
7	50	50
8	40	60
10	30	70
15	20	80
20	20	80
25	30	70
30	40	60