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(a) Fluorescence titration curve of HSA with compound 2. Arrow indicates the increase of quencher concentration. (b) Stern-Volmer plot for quenching with ligand 1 and compounds 2, 3, 5-8 and cisplatin. In the measurements of the fluorescence titration curve of HAS with compound 4 the appearance of a precipitate prevented us to obtain a valid reading and therefore the Stern-Volmer plot was not included in graph b).
