Fig. 1a

Fig. 1b

Fig. 1c

Fig. 1d

The mobile phases studied
| No. | Mobile phase A | Mobile phase B |
|---|---|---|
| 1 | Water with 5 mM ammonium acetate and 0.1% formic acid | Acetonitrile with 0.1% formic acid |
| 2 | Water with 5 mM ammonium acetate and 0.1% formic acid | Acetonitrile : methanol (50/50; v/v) with 0.1% formic acid |
| 3 | Water with 5 mM ammonium acetate and 0.1% formic acid | Methanol with 0.1% formic acid |
| 4 | Water with 5 mM ammonium acetate and 0.01% formic acid | Methanol with 0.1% formic acid |
| 5 | Water with 5 mM ammonium acetate, 0.1% formic acid and 0.01% trichloroacetic acid (TCA) | Methanol with 0.1% formic acid |
| 6 | Water with 5 mM ammonium acetate, 0.01% formic acid and 0.01% TCA | Methanol with 0.1% formic acid |