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Issue 17, 2019
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Unraveling the molecular mechanisms of color expression in anthocyanins

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Abstract

Anthocyanins are a broad family of natural dyes, increasingly finding application as substitutes for artificial colorants in the food industry. In spite of their importance and ubiquity, the molecular principles responsible for their extreme color variability are poorly known. We address these mechanisms by computer simulations and photoabsorption experiments of cyanidin-3-O-glucoside in water solution, as a proxy for more complex members of the family. Experimental results are presented in the range of pH 1–9, accompanied by a comprehensive systematic computational study across relevant charge states and tautomers. The computed spectra are in excellent agreement with the experiments, providing unprecedented insight into the complex behavior underlying color expression in these molecules. Besides confirming the importance of the molecule's charge state, we also unveil the hitherto unrecognized role of internal distortions in the chromophore, which affect its degree of conjugation, modulating the optical gap and in turn the color. This entanglement of structural and electronic traits is also shared by other members of the anthocyanin family (e.g. pelargonidin and delphinidin) highlighting a common mechanism for color expression across this important family of natural dyes.

Graphical abstract: Unraveling the molecular mechanisms of color expression in anthocyanins

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Supplementary files

Article information


Submitted
06 Feb 2019
Accepted
12 Mar 2019
First published
18 Mar 2019

This article is Open Access

Phys. Chem. Chem. Phys., 2019,21, 8757-8766
Article type
Paper

Unraveling the molecular mechanisms of color expression in anthocyanins

M. Rusishvili, L. Grisanti, S. Laporte, M. Micciarelli, M. Rosa, R. J. Robbins, T. Collins, A. Magistrato and S. Baroni, Phys. Chem. Chem. Phys., 2019, 21, 8757
DOI: 10.1039/C9CP00747D

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