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An Iron(III)-Catechol Complex as a Mushroom Pigment
Franz von Nussbaum1, Peter Spiteller1, Matthias Rüth1
1Institut für Organische Chemie der Universität, Karlstrasse 23, D-80333 München (Germany), Fax: (+49) 89-5902-604.
Angewandte Chemie (International Ed. in English)
|May 2, 2018
Summary
The dark violet mushroom Cortinarius violaceus uses iron ink as its pigment. This pigment is a 1:2 iron(III)-catechol complex, with (R)-β-dopa as the key amino acid ligand.
Area of Science:
- Mycology
- Biochemistry
- Materials Science
Background:
- The pigment responsible for the distinctive dark violet color of the mushroom Cortinarius violaceus has not been previously identified.
- Understanding fungal pigments can provide insights into unique natural compounds and their applications.
Purpose of the Study:
- To identify the chemical composition of the pigment in Cortinarius violaceus.
- To elucidate the molecular structure of the pigment complex.
Main Methods:
- Spectroscopic analysis to determine the elemental composition of the pigment.
- Chemical analysis to identify organic ligands associated with the metal ion.
Main Results:
- The pigment was identified as an iron-based ink.
- A 1:2 iron(III)-catechol complex was detected.
- The amino acid (R)-β-dopa was identified as the ligand coordinating the iron-catechol complex.
Conclusions:
- Cortinarius violaceus utilizes an iron-based pigment for its coloration.
- The pigment is a novel iron(III)-catechol complex involving (R)-β-dopa, representing a unique biochemical mechanism for natural color production.
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