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. Author manuscript; available in PMC: 2012 Mar 11.
Published in final edited form as: J Chromatogr A. 2011 Jan 5;1218(10):1359–1366. doi: 10.1016/j.chroma.2010.12.114

Table 2.

The slopes, intercept and ΔGCH2 a obtained from different carbon phases

Materials Slope (B) Intercept R2 ΔGCH2(cal/mol)c
ODS b 0.301± 0.001 -0.712±0.003 0.99999 -431±1
C/ZrO2 0.322± 0.002 -1.349±0.003 0.99995 -461±3
24 % C/Al2O3 c 0.376± 0.003 -1.02±0.01 0.99986 -538 ±4
8 % C/2μmolAl/SiO2 0.305± 0.001 -1.49±0.01 0.99986 -437 ±1
32 % C/2μmolAl/SiO2 0.350± 0.002 -1.33±0.01 0.99986 -501 ±3
14 % C/8μmolAl/SiO2 0.332± 0.002 -1.34±0.01 0.99990 -475 ±3
21 % C/8μmolAl/SiO2 0.338± 0.002 -1.24±0.01 0.99987 -484 ±3
25 % C/8μmolAl/SiO2 0.339± 0.002 -1.21±0.01 0.99986 -486 ±3
a

The free energy of transfer per methylene group based on nitroalkane homolog series. (See Fig. 4 for LC conditions)

b

Zorbax SB C18, uracil used for dead volume measurement, 50 × 2.1 mm id. Column

c

Data obtained from ref 14.

d

The slope and intercept of the linear regression of log k’ vs. n CH2