Chemistry of anthocyanin pigments. 9. UV-visible spectrophotometric determination of the acidity constants of apigeninidin and three related 3-deoxyflavylium salts

R Brouillard, GA Iacobucci…

Index: Brouillard, R.; Iacobucci, G. A.; Sweeny, J. G. Journal of the American Chemical Society, 1982 , vol. 104, # 26 p. 7585 - 7590

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Citation Number: 83

Abstract

Abstract: The equilibrium constants for the structural transformations of some 3- deoxyanthocyanidins in water at 25 “C have been measured by using the pH-jump method. This method has been described previously. 2 According to their particular substitution patterns, hydroxylated flavylium salts can exist in slightly acidic media in several neutral forms: the quinoidal bases A, the carbinol pseudobase B, and the chalcone pseudobase ...