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Spectral and colorimetric characteristics of metal chelates of acylated cyanidin derivatives.
Food Chemistry 2017 April 16
Colorants derived from nature are increasingly popular due to consumer demand. Anthocyanins are a class of naturally occurring pigments that produce red-purple-blue hues in nature, especially when interacting with metal ions and co-pigments. The role of various acylations of cyanidin (Cy) derivatives on color expression and stability of Al(3+) and Fe(3+) chelates in pH 6-7 were evaluated by spectrophotometry (380-700nm) and colorimetry (CIE-L(∗)a(∗)b(∗)) during dark, ambient storage (48h). Increased substitution generally increased λmax of Cy chelates: malonic acid monoacylationferulic-sinapic>sinapic-sinapic)>monoacylated (malonic≈sinapic>ferulic>p-coumaric).
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