TABLE 2.
Cathodal extraction fluxes (nmol × h−1 × cm−2) at 6 h for glucose and the neutral internal standard candidates
| MW | pH 8.5 + 30 mM NaCl | pH 8.5 + 30 mM NaCl + 10 mM EDTA | pH 8.5 + 100 mM CaCl2* | pH 6.3 + 30 mM NaCl* | n | |
|---|---|---|---|---|---|---|
| Urea | 60 | 41.4 ± 7.9† | 52.0 ± 6.6† | 26.5 ± 10.5† | 27.2 ± 7.9† | 4 |
| JEO | 33.2 ± 3.6 | 46.5 ± 3.9 | 20.1 ± 6.2 | 25.5 ± 6.8† | 4 | |
| Glycerol | 92 | 36.7 ± 8.5† | 49.6 ± 9.2 | 21.7 ± 11.8 | 16.1 ± 6.5 | 4 |
| JEO | 33.9 ± 7.9 | 47.4 ± 8.4 | 18.7 ± 9.4 | 14.2 ± 5.4 | 4 | |
| Mannitol | 182 | 28.2 ± 2.6 | 41.5 ± 4.7 | 14.7 ± 2.6 | 11.8 ± 4.4 | 4 |
| Glucose | 180 | 26.2 ± 3.7 | 39.6 ± 5.0 | 15.2 ± 5.5 | 12.4 ± 4.1 | 16 |
| Sucrose | 342 | 27.2 ± 5.0 | 40.8 ± 6.0 | 16.0 ± 5.8 | 12.6 ± 6.7 | 4 |
The electroosmotic contributions (corrected for passive diffusion) for urea and glycerol fluxes are given as JEO.
*
The extraction fluxes at pH 8.5 + 100 mM CaCl2 were not significantly different, for any solute, from those at pH 6.3 + 30 mM NaCl.
†
These values are significantly different (p < 0.01) from all others in the corresponding columns.