Figure 2.

Singlet oxygen phosphorescence decays at 1270 nm acquired in TPP solution in DMSO–d6:CHCl₃ (1:1, v/v) upon excitation with 590 nm laser pulse in the absence and in the presence of increasing concentration (5.2–19.1 mM) of TUDCA (A). Dependence of pseudo-first-order rate constant (s⁻¹) of singlet-oxygen quenching on concentration of both bile acids studied TUDCA and UDCA (B).