Fig. 1: Protocol of AUC-SAS for multi-component system.

For aggregation system, in Steps 3 and 4, the contribution of monomer in the scattering intensity is estimated because that of aggregation is not measurable directly. On the other hand, if all ij(q) (j ≠ k) are obtained by individual measurements, such as an association–dissociation equilibrium system, Steps 3 and 4 are skipped.