Table 1.

The composition of mobile phases.

Type	Mobile Phase A	Mobile Phase B
I	water/methanol (98:2) + 0.05% formic acid	methanol + 0.05% formic acid
II	0.1% formic acid	methanol
III	0.1% formic acid	acetonitrile
IV	0.05% formic acid + 5 mmol/L ammonium acetate	methanol
V	0.05% formic acid + 5 mmol/L ammonium acetate	acetonitrile