Table 2.

Measured values for k′, D_m, D_eff, and $\frac{D_{\mathit{eff}}}{D_m}$ along with the conditions used for the BEH-C18 column (2.1 mm × 50 mm, 1.7 μm) at 30 °C.

Analyte	Mobile phase	k′	Dm (cm2/s)	Deff (cm2/s)	$\frac{D_{\mathit{eff}}}{D_m}$
Ascorbic acid	50/50 water/MeOH	0	4.43 ± 0.08 × 10−6	2.01 × 10−6	0.45
MA	60/40 water/MeOH	0.75	5.07 ± 0.09 × 10−6	2.95 × 10−6	0.58
4-MHA	75/25 water/MeOH	5.50	5.07 ± 0.09 × 10−6	1.43 × 10−6	0.28
4-MHA	85/15 water/MeOH	13.7	5.96 ± 0.11 × 10−6	1.12 × 10−6	0.19
4-MHA	92.5/7.5 water/MeOH	34.8	6.49 ± 0.12 × 10−6	8.42 × 10−7	0.13