Fig. 5

(a) Absorption variation of MPTP (100 µM) with cations (100 µM) at 361 nm, and (b) Colour change of MPTP (200 μm in ethanol) in the presence of various cations (200 μm in ethanol).

(a) Absorption variation of MPTP (100 µM) with cations (100 µM) at 361 nm, and (b) Colour change of MPTP (200 μm in ethanol) in the presence of various cations (200 μm in ethanol).