Please use this identifier to cite or link to this item:
http://hdl.handle.net/10884/1335
Title: | Formation of Anthocyanin Ion-pairs. A Co-Pigmentation Effect |
Authors: | Figueiredo, Paulo Pina, Fernando |
Issue Date: | 1994 |
Citation: | J. CHEM. SOC. PERKIN TRANS. 2, pages 775-778 |
Abstract: | The influence of the addition of ionic salts (NaCI, NaBr, Nal, NaCIO,) on anthocyanin equilibria is studied in this work. The effect of their addition is a colour enhancement through the formation of an ion-pair between the charged flavylium cation and the anion, which displaces the equilibria towards the coloured flavylium form. The ion-pair formation is an alternative model to that which suggests a preferable hydration of salt anions instead of the flavylium cation. Throughout this work two natural anthocyanins are studied (malvidin 3,5-diglucoside and malvidin 3-glucoside) as well as one anthocyanidin (malvidin). The thermal and photochemical stability of the ion-pairs formed is also examined. Experiments with a synthetic anthocyanin anaIogue (4',7-dihydroxyf lavyIiu m c hloride) w hich has photochromic properties are also described for comparison purposes |
URI: | http://hdl.handle.net/10884/1335 |
Appears in Collections: | A CS/CN - Artigos |
Files in This Item:
File | Description | Size | Format | |
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perkin1.pdf | 1.95 MB | Adobe PDF | View/Open |
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