Publication: Reversible bleaching of betalains induced by metals and application to the fluorescent determination of anthrax biomarker
Authors
Guerrero Rubio, M. Alejandra ; Martínez Zapata, Joaquín ; Henarejos Escudero, Paula ; Gandía Herrero, Fernando ; García Carmona, Francisco
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Publisher
Elsevier
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DOI
https://doi.org/10.1016/j.dyepig.2020.108493
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info:eu-repo/semantics/article
Description
© 2020 Elsevier Ltd. This document is the Published version of a Published Work that
appeared in final form in Dyes and Pigments. To access the final edited and published work see https://doi.org/10.1016/j.dyepig.2020.108493
Abstract
Betalains are antioxidant pigments of plant origin that are found in nature in the order Caryophyllales. They are
classified into two groups: betacyanins, which present a violet coloration, and betaxanthins, fluorescent betalains
with yellow coloration. In this work, the effect of metals, such as copper and europium, on the spectroscopic
properties of betalains is studied. For the first time, the reversibility of spectral changes in fluorescence and
absorbance is considered after the addition of chelating substances. These results explain the general bleaching of betalains by metals. The reversibility of the betalain-metal complexes is applied to the fluorescent detection of
the presence of spores from Bacillus by the interaction of the complexes with the chelator dipicolinic acid, which
is the main and characteristic component of endospores. This fast, economic method allows the detection of
spores below the infective dose for anthrax by using a flower pigment present in Mirabilis jalapa.
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Citation
Dyes and Pigments, 2020, Vol. 180 : 108493
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