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Metal Chelates of Petunidin Derivatives Exhibit Enhanced Color and Stability.

ABSTRACT: Anthocyanins with catechol (cyanidin) or pyrogallol (delphinidin) moieties on the B-ring are known to chelate metals, resulting in bluing effects, mainly at pH ? 6. Metal interaction with petunidin, an O-methylated anthocyanidin, has not been well documented. In this study, we investigated metal chelation of petunidin derivatives in a wide pH range and its effects on color and stability. Purple potato and black goji extracts containing >80% acylated petunidin derivatives (25 µM) were combined with Al3+ or Fe3+ at 0 µM to 1500 µM in buffers of pH 3-10. Small metal ion concentrations triggered bathochromic shifts (up to ~80nm) at an alkaline pH, resulting in vivid blue hues (hab 200°-310°). Fe3+ caused a larger bathochromic shift than Al3+, producing green colors at pH 8-9. Generally, metal ions increased the color stability and half-life of petunidin derivatives in a dose-dependent manner, particularly at pH 8. Petunidin derivative metal chelates produced a wide range of colors with enhanced stability.

SUBMITTER: Tang P

PROVIDER: S-EPMC7599678 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature

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Metal Chelates of Petunidin Derivatives Exhibit Enhanced Color and Stability.

Tang Peipei P Giusti M Monica MM

Foods (Basel, Switzerland) 20201009 10

Anthocyanins with catechol (cyanidin) or pyrogallol (delphinidin) moieties on the B-ring are known to chelate metals, resulting in bluing effects, mainly at pH ≤ 6. Metal interaction with petunidin, an <i>O</i>-methylated anthocyanidin, has not been well documented. In this study, we investigated metal chelation of petunidin derivatives in a wide pH range and its effects on color and stability. Purple potato and black goji extracts containing >80% acylated petunidin derivatives (25 µM) were comb ...[more]

PMID: 33050218

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Metal Chelates of Petunidin Derivatives Exhibit Enhanced Color and Stability.

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Metal Chelates of Petunidin Derivatives Exhibit Enhanced Color and Stability.

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