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Organic–Inorganic Hybrid Pigments Based on Bentonite: Strategies to Stabilize the Quinoidal Base Form of Anthocyanin

Anthocyanins are one of the natural pigments that humanity has employed the most and can substitute synthetic food dyes, which are considered toxic. They are responsible for most purple, blue, and red pigment nuances in tubers, fruits, and flowers. However, they have some limitations in light, pH, o...

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Autores principales: Cunha, Robson V., Morais, Alan I. S., Trigueiro, Pollyana, de Souza, João Sammy N., Damacena, Dihêgo H. L., Brandão-Lima, Luciano C., Bezerra, Roosevelt D. S., Fonseca, Maria Gardennia, Silva-Filho, Edson C., Osajima, Josy A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9917136/
https://www.ncbi.nlm.nih.gov/pubmed/36768738
http://dx.doi.org/10.3390/ijms24032417
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author Cunha, Robson V.
Morais, Alan I. S.
Trigueiro, Pollyana
de Souza, João Sammy N.
Damacena, Dihêgo H. L.
Brandão-Lima, Luciano C.
Bezerra, Roosevelt D. S.
Fonseca, Maria Gardennia
Silva-Filho, Edson C.
Osajima, Josy A.
author_facet Cunha, Robson V.
Morais, Alan I. S.
Trigueiro, Pollyana
de Souza, João Sammy N.
Damacena, Dihêgo H. L.
Brandão-Lima, Luciano C.
Bezerra, Roosevelt D. S.
Fonseca, Maria Gardennia
Silva-Filho, Edson C.
Osajima, Josy A.
author_sort Cunha, Robson V.
collection PubMed
description Anthocyanins are one of the natural pigments that humanity has employed the most and can substitute synthetic food dyes, which are considered toxic. They are responsible for most purple, blue, and red pigment nuances in tubers, fruits, and flowers. However, they have some limitations in light, pH, oxygen, and temperature conditions. Combining biomolecules and inorganic materials such as clay minerals can help to reverse these limitations. The present work aims to produce materials obtained using cetyltrimethylammonium bromide in bentonite clay for incorporation and photostabilization of anthocyanin dye. Characterizations showed that the organic molecules were intercalated between the clay mineral layers, and the dye was successfully incorporated at a different pH. Visible light-driven photostability tests were performed with 200 h of irradiation, confirming that the organic–inorganic matrices were efficient enough to stabilize the quinoidal base form of anthocyanin. The pigment prepared at pH 10 was three-fold more stable than pH 4, showing that the increase in the synthesis pH promotes more stable colors, probably due to the stronger intermolecular interaction obtained under these conditions. Therefore, organobentonite hybrids allow to stabilize the fragile color coming from the quinoidal base form of anthocyanin dyes.
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spelling pubmed-99171362023-02-11 Organic–Inorganic Hybrid Pigments Based on Bentonite: Strategies to Stabilize the Quinoidal Base Form of Anthocyanin Cunha, Robson V. Morais, Alan I. S. Trigueiro, Pollyana de Souza, João Sammy N. Damacena, Dihêgo H. L. Brandão-Lima, Luciano C. Bezerra, Roosevelt D. S. Fonseca, Maria Gardennia Silva-Filho, Edson C. Osajima, Josy A. Int J Mol Sci Article Anthocyanins are one of the natural pigments that humanity has employed the most and can substitute synthetic food dyes, which are considered toxic. They are responsible for most purple, blue, and red pigment nuances in tubers, fruits, and flowers. However, they have some limitations in light, pH, oxygen, and temperature conditions. Combining biomolecules and inorganic materials such as clay minerals can help to reverse these limitations. The present work aims to produce materials obtained using cetyltrimethylammonium bromide in bentonite clay for incorporation and photostabilization of anthocyanin dye. Characterizations showed that the organic molecules were intercalated between the clay mineral layers, and the dye was successfully incorporated at a different pH. Visible light-driven photostability tests were performed with 200 h of irradiation, confirming that the organic–inorganic matrices were efficient enough to stabilize the quinoidal base form of anthocyanin. The pigment prepared at pH 10 was three-fold more stable than pH 4, showing that the increase in the synthesis pH promotes more stable colors, probably due to the stronger intermolecular interaction obtained under these conditions. Therefore, organobentonite hybrids allow to stabilize the fragile color coming from the quinoidal base form of anthocyanin dyes. MDPI 2023-01-26 /pmc/articles/PMC9917136/ /pubmed/36768738 http://dx.doi.org/10.3390/ijms24032417 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Cunha, Robson V.
Morais, Alan I. S.
Trigueiro, Pollyana
de Souza, João Sammy N.
Damacena, Dihêgo H. L.
Brandão-Lima, Luciano C.
Bezerra, Roosevelt D. S.
Fonseca, Maria Gardennia
Silva-Filho, Edson C.
Osajima, Josy A.
Organic–Inorganic Hybrid Pigments Based on Bentonite: Strategies to Stabilize the Quinoidal Base Form of Anthocyanin
title Organic–Inorganic Hybrid Pigments Based on Bentonite: Strategies to Stabilize the Quinoidal Base Form of Anthocyanin
title_full Organic–Inorganic Hybrid Pigments Based on Bentonite: Strategies to Stabilize the Quinoidal Base Form of Anthocyanin
title_fullStr Organic–Inorganic Hybrid Pigments Based on Bentonite: Strategies to Stabilize the Quinoidal Base Form of Anthocyanin
title_full_unstemmed Organic–Inorganic Hybrid Pigments Based on Bentonite: Strategies to Stabilize the Quinoidal Base Form of Anthocyanin
title_short Organic–Inorganic Hybrid Pigments Based on Bentonite: Strategies to Stabilize the Quinoidal Base Form of Anthocyanin
title_sort organic–inorganic hybrid pigments based on bentonite: strategies to stabilize the quinoidal base form of anthocyanin
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9917136/
https://www.ncbi.nlm.nih.gov/pubmed/36768738
http://dx.doi.org/10.3390/ijms24032417
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