Photodynamic activity of pyropheophorbide methyl ester and pyropheophorbide a in dimethylformamide solution.
Comparative spectroscopic study including the photosensitizers of pyropheophorbide methyl ester (PPME) and pyropheophorbide a (PPa) was performed to study their photodynamic activity. The investigated photosensitizers in a homogeneous system of dimethylformamide (DMF) are not photostable upon irradiation. The photobleaching efficiency of PPa is higher than that of PPME. Combining these results with the data obtained by measuring the singlet oxygen quantum yield and the hydroxyl group generation, it was revealed that the photobleaching efficiency could be correlated with the singlet oxygen quantum yield and the hydroxyl group production of the photosensitizer.
Al-Omari
Saleh
S
Department of Physics, The Hashemite University, Zarqa 13115, Jordan. salomar@hu.edu.jo
Ali
Ahmad
A
D000042:Absorption; D000465:Algorithms; D002734:Chlorophyll / Q000031:analogs & derivatives* / Q000737:chemistry; D004126:Dimethylformamide / Q000737:chemistry*; D007700:Kinetics; D038761:Photobleaching; D017319:Photosensitizing Agents / Q000737:chemistry; D011166:Porphyrins / Q000737:chemistry*; D026082:Singlet Oxygen / Q000737:chemistry; D013050:Spectrometry, Fluorescence
D017319:Photosensitizing Agents; D011166:Porphyrins; C452939:pyropheophorbide-a methylester; D002734:Chlorophyll; D026082:Singlet Oxygen; C040298:pyropheophorbide a; D004126:Dimethylformamide