Solvatochromic behavior of the natural colorant of blueberry (Vaccinium floribundum Kunth)

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Published: Oct 5, 2023
Updated: 2023-10-05
Versions:
2023-10-05 (4)
DOI: https://doi.org/10.17163/lgr.n38.2023.01
Keywords:
malvidin-3-glucoside, secondary metabolites, dye, natural products, solvatochromism, anthocyanins, pectin

Main Article Content

Tatiana Stephanie Mora Gilces
Universidad Central del Ecuador
https://orcid.org/0000-0002-7442-6317
Martha Suárez
Universidad Central del Ecuador
https://orcid.org/0000-0002-1573-7430
Carlos Brito
Universidad Central del Ecuador
https://orcid.org/0000-0002-7371-5141
Dennys Almachi
Universidad Central del Ecuador
https://orcid.org/0000-0002-6316-0314

Abstract

The solvatochromic effect is the modification of the absorption spectrum of a solute by varying the solvent. This research evaluated the solvatochromic characteristics of Malvidin-3-glucoside hydrochloride. The method to obtain maximum wavelengths was by spectral scanning. In primary standard CAS No. 7228-78.6, the variation was determined in binary mixtures of ethanol-water: 40,55, and 70%v/v. The solvatochromic effect when modifying the pH of the solvent (water) was evaluated in natural dye and stabilized. The results suggest that the intermolecular hydrogen connections between Malvidin-3-glucoside and the ethanol-water binary mixtures are responsible for the solvatochromic changes: 565.2586 ± 3.2784nm, 472.5498 ± 2.5128nm and 457.3589 ± 6.2586nm, produced by the analyzed combinations. When anthocyanins are stabilized in a chelating matrix, the solvatochromic changes produced by varying the pH of the water solvent are not significant compared to the unstabilized natural dye.

Article Details

Issue
Vol. 38 No. 2: (September 2023-February 2024)
Section
Scientific Article
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