13.

Time profiles recorded at 490 nm after excitation at 337 nm (pulse duration 800 ps, energy 1.9 mJ) for AlPcS₄ (5 μM) in buffer solution (black noisy line), in the presence of HSA (150 μM) (blue noisy line), and in the presence of human colon cells (red noisy line, AlPcS₄ (1 μM)). The excited triplet state decay in each case is well described by a single exponential function (smooth lines). The numbers in the figure indicate the decay times of the AlPcS₄ triplet state in a given solution.