Figure 4.
(A), Purification of recombinant Aβ(1–40) by reverse-phase HPLC on a Vydac C18 column. The elution solution from 24 min to 28 min (arrows) was collected and lyophilized. (B), Chromatographic profile of a chemically synthesized purified Aβ(1–40) on the same Vydac C18 column using the same elution gradient for comparison. The dashed line indicated the percentage (v/v) of acetonitrile in the elution solution.