100 µL solution of PFKDOPA fibrils at a concentration of 3 mM, prepared as described above in Hepes buffer (50 mM, pH 7.4, KCl 0.6 M) was co-incubated for 2h with the pre-coated silica beads. The beads were subsequently centrifuged and separated, and washed three times with DIW to remove PFKDOPA/salt leftovers. The coated and washed beads were inserted into a 3 mL plasticsyringe, fitting the volume of the syringe.