Table S5.

The peak capacity comparison of three stationary phase.

	Biphenyl	F5	C18
0.1% FA (pH ≈ 2.6)	37.2	39.5	28.1
1% FA (pH ≈ 2.2)	48.1	51.9	39.2
2% FA (pH ≈ 1.9)	54.6	58.5	45.8
3% FA (pH ≈ 1.7)	63.7	67.3	53.6
3% AcOH (pH ≈ 2.5)	41.3	43.1	27.4

^*The specification was 2.1 × 100 mm, 2.6 μm particle size.