title: The effect of the irradiation wavelength on the processes sensitized by protoporphyrin IX dimethyl ester.
abstract: The formation of triplet states of photosensitizers and singlet oxygen during reactions sensitized by protoporphyrin IX dimethyl ester (PPDME) and the products of its photo-oxidation in solution were studied by time-resolved spectroscopy. Irradiation with long-wavelength light (670 nm), which is absorbed by the products of photo-oxidation of PPDME, provides lower quantum yields of singlet oxygen than in sensitization with PPDME alone, which absorbs light with a wavelength of 630 nm. Spectroscopic measurements also confirmed the lower rate of sensitized photo-oxidation of bilirubin during irradiation with light with a wavelength of 670 nm.
authors.affiliation: J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Praha.
authors.forename: P
authors.initials: P
authors.lastname: Kubát
authors.forename: Z
authors.initials: Z
authors.lastname: Zelinger
authors.forename: M
authors.initials: M
authors.lastname: Jirsa
mesh_terms: D001663:Bilirubin / Q000528:radiation effects; D007834:Lasers; D008027:Light; D010100:Oxygen / Q000378:metabolism*; D010777:Photochemistry; D010778:Photochemotherapy; D017319:Photosensitizing Agents / Q000494:pharmacology*; D011524:Protoporphyrins / Q000494:pharmacology*; D026082:Singlet Oxygen; D013056:Spectrophotometry, Ultraviolet; D014978:Xenon
chemical_list: D017319:Photosensitizing Agents; D011524:Protoporphyrins; D026082:Singlet Oxygen; D014978:Xenon; C041104:dimethyl protoporphyrin IX; D001663:Bilirubin; D010100:Oxygen