The absorption, fluorescence and phosphorescence of phalloidin and α-amanitin |
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Authors: | Eva Fü rlinger,Otto S. Wolfbeis, |
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Affiliation: | Institut für Organische Chemie, Karl-Franzens-Universität, 8010 Graz, Austria |
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Abstract: | The peptides, phalloidin and α-amanitin, contain two unusual indole-derived chromophores, whose absorption, fluorescence and phosphorescence in aqueous solutions are described. Fluorescence is very weak, but phosphorescence at 77 K is intense. Phalloidin seems to undergo adiabatic photodissociation in alkaline solutions and to fluorescence from the indole anion form. In contrast, neither the phenolic nor the indolic protons of α-amanitin undergo photodissociation. The pKa value of the phenolic hydroxy group of α-amanitin is 9.71 at 23°C. |
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Keywords: | α -Amanitin Phalloidin Absorption Fluorescence Phosphorescence |
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