Table 1.
Experimental data obtained for the mobility of dextrans in water
| 37°C
|
22°C
|
||||||
|---|---|---|---|---|---|---|---|
| Mw (kDa) | R (Å)a | Theoretical D (μm2s–1) | Experimental 3D D (μm2s–1) | Ratio | Teoretical D (μm2s–1) | Experimental 3D D (μm2s–1) | Ratio |
| 20 | 33 | 97.5 | 79.9 ± 5.2 | 0.82 | 70.6 | 63.43 ± 3.9 | 0.90 |
| 40 | 45 | 73 | 59.0 ± 4.6 | 0.80 | 52.9 | 51.5 ± 2.3 | 0.96 |
| 70 | 60 | 54.2 | 48.5 ± 2.6 | 0.89 | 39.3 | 43.7 ± 1.3 | 1.11 |
| 500 | 133b | 24.6 | 32.8 ± 1.9 | 1.33 | 17.8 | 23.2 ± 1.1 | 1.30 |
Ratio is the quotient between the experimentally estimated and the theoretically expected diffusion coefficients at each temperature. Diffusion coefficients were estimated using the 3D method.
a
Values reported in Sigma-Aldrich; supplier data online
b
This value was extrapolated from the radius values reported in supplier's data using the relation R = C + A M1/3, where C = –1.81 Å and A = 0.19