Figure 2.

Quenching of HSA fluorescence by PpIX obtained for 280 nm (${}_{▬■▬}$) and 295 nm (${}_{▬●▬}$) excitation wavelength. In the inserts: fluorescence emission spectra of HSA at concentration 1 × 10⁻⁶ M (I) and HSA in the presence of increasing PpIX concentration in range from 1 × 10⁻⁵ M to 3 × 10⁻⁴ M (II, III, IV, V, VI, VII, VIII) excited at 280 nm (Insert 1) and 295 nm (Insert 2).