Photodegradation and photosensitization of mycosporine-like amino acids.

摘要: The photodegradation and photosensitization of several mycosporine-like amino acids (MAAs) were investigated. the MAA, palythine, was tested with three photosensitizers: riboflavin, rose bengal natural seawater. For comparison degradation rates, riboflavin-mediated six other MAAs also examined. When riboflavin used as a photosensitizer in distilled water, undetectable after 1.5h. Palythine showed little when added (k=0.12x10(-3)m(2)kJ(-1)). dissolved seawater containing high nitrate concentrations slow rate constants (k=0.26x10(-3)m(2)kJ(-1)) over 24-h period constant irradiation. Similar experiments deep porphyra-334 shinorine resulted 75% initial MAA remaining 4h irradiation rates 0.018 0.026x10(-3) m(2) kJ(-1), respectively. Experiments conducted additions between 0.77x10(-3) 1.19x10(-3)m(2)kJ(-1) for porphyra-334, Photoproduct formation appeared to be minimal presence dehydration product cycloheximine ring structure indicated well acids. Evidence continues build role potent stable UV absorbers. This study further highlights photostability both photosensitizers.