Figure 4: Sedimentation equilibrium in the AUC. The top row of plots show ln c(r) vs r2 for IE1, IE2 and IE4.
As the fit lines are linear, it can be assumed that the samples are all near-monodisperse. The second row of plots shows M*(r) vs r, the plots have been extrapolated to the cell base (radius = 7.155 cm) to give the weight average molar mass over the whole distribution (Mw) (Creeth and Harding 1982). The bottom set of plots show local or point average molar masses Mw(r) at different positions r by taking the local gradients along the ln c(r) vs r2 curve. These plots are noisier than the estimate for the whole distribution Mw because of the differentiations of the data.
