Solvatochromic behavior of the natural colorant of blueberry (Vaccinium floribundum Kunth)
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.
| Main Authors: | , , , |
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| Format: | Digital revista |
| Language: | spa eng |
| Published: |
Universidad Politécnica Salesiana
2023
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| Online Access: | https://lagranja.ups.edu.ec/index.php/granja/article/view/6676 |
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