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Updated: Jun 27, 2026

Annotation of Plant Gene Function via Combined Genomics, Metabolomics and Informatics
Published on: June 17, 2012
Ultrafast internal conversion in a model anthocyanin-polyphenol complex: implications for the biological role of
Rita França Rodrigues1, Palmira Ferreira da Silva, Karina Shimizu
1Centro de Química Estrutural, Technical University Lisbon, Av. Rovisco Pais s/n, 1049-001 Lisbon, Portugal.
Abstract:
The red flavylium cations of anthocyanins form ground-state charge-transfer complexes with several naturally occurring electron-donor copigments, such as hydroxylated flavones and hydroxycinnamic or benzoic acids. Excitation of the 7-methoxy-4-methyl-flavylium-protocatechuic acid complex results in ultrafast (240 fs) internal conversion to the ground state of the complex by way of a low-lying charge-transfer state. Thus, both uncomplexed anthocyanins, whose excited state decays by fast (5-20 ps) excited-state proton transfer, and anthocyanin-copigment complexes have highly efficient mechanisms of deactivation that are consistent with the proposed protective role of anthocyanins against excess solar radiation in the vegetative tissues of plants.
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