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Photochemical and photophysical properties of lumazine in aqueous solutions

Paper ID Volume ID Publish Year Pages File Format Full-Text
28998 44112 2008 5 PDF Available
Title
Photochemical and photophysical properties of lumazine in aqueous solutions
Abstract

Lumazine (pteridine-2,4(1H,3H)-dione, LU) was investigated for its efficiency of singlet oxygen (1O2) production and quenching in aqueous solution. The quantum yield of 1O2 production (ΦΔ) was determined by measurements of the 1O2 luminescence in the near-infrared upon continuous excitation of the sensitizer. Values of ΦΔ are sensitive to the pH and were found to be 0.44 ± 0.01 and 0.080 ± 0.004 in acidic and alkaline media, respectively. The photochemical stability of LU was investigated under different pH conditions, in the presence and in the absence of O2. The photochemical consumption of LU in aqueous solution at room temperature under irradiation at 350 nm was followed by UV–vis spectrophotometry and HPLC. Values of the quantum yields of LU disappearance are low, indicating that LU is rather photostable under physiological conditions.

Keywords
Lumazine; Singlet oxygen; UV-A
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Photochemical and photophysical properties of lumazine in aqueous solutions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 200, Issues 2–3, 15 December 2008, Pages 282–286
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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