NDLI: Experimental study of the excited-state properties and photostability of the mycosporine-like amino acid palythine in aqueous solution

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Photochemical & Photobiological Sciences Vol - 6 Issue - 5

Photochemical & Photobiological Sciences Vol - 6 Issue - 4

Photochemical & Photobiological Sciences Vol - 6 Issue - 3

Photochemical & Photobiological Sciences Vol - 6 Issue - 2

Photochemical & Photobiological Sciences Vol -5

Photochemical & Photobiological Sciences Vol -4

Photochemical & Photobiological Sciences Vol -3

Photochemical & Photobiological Sciences Vol -2

Experimental study of the excited-state properties and photostability of the mycosporine-like amino acid palythine in aqueous solution

Content Provider	Royal Society of Chemistry (RSC)
Author	Previtali, Carlos Mario Churio, María Sandra Conde, Federico Rubén
Copyright Year	2007
Abstract	Characterization of the excited states of the mycosporine-like amino acid palythine (λmax = 320 nm) in aqueous solutions was achieved experimentally. The low value for the photodegradation quantum yield, (1.2 ± 0.2) × 10−5, confirms that palythine is highly photostable in air saturated-aqueous solutions. Laser flash photolysis of acetone in the presence of palythine allowed for the observation of a transient spectrum which is consistent with the triplet–triplet absorption of palythine. Kinetic treatment of the transient signals yields a lifetime of the triplet state of ca. 9 µs and a triplet energy around 330 kJ mol−1. The photoacoustic calorimetry results are consistent with non-radiative decay as the major fate of excited palythine. A comparison of the photodegradation quantum yields and photophysical properties of palythine with those previously determined for the other mycosporine-like amino acids, shinorine and porphyra-334, suggests that geometrical isomerization around the CN bond may contribute to the rapid deactivation of this group of molecules.
Starting Page	669
Ending Page	674
Page Count	6
File Format	HTM / HTML PDF
ISSN	1474905X
Volume Number	6
Issue Number	6
Journal	Photochemical & Photobiological Sciences
DOI	10.1039/b618314j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Photodegradation Carboxylic acid Isomerization Covalent bond Calorimetry Mycosporine-like amino acid Flash photolysis Quantum tunnelling Acetone
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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