Journal
FOOD CHEMISTRY
Volume 208, Issue -, Pages 26-34Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2016.03.109
Keywords
Anthocyanin; Anthocyanin-metal chelate; Metalloanthocyanin; Brassica oleracea var. capitata f. rubra; Aronia melanocarpa
Funding
- Mars Global Chocolate, NJ, U.S.A.
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In many food products, colorants derived from natural sources are increasingly popular due to consumer demand. Anthocyanins are one class of versatile and abundant naturally occurring chromophores that produce different hues in nature, especially with metal ions and other copigments assisting. The effects of chelation of metal ions (Mg2+, Al3+, Cr3+, Fe3+, and Ga3+) in factorial excesses to anthocyanin concentration (0-500x) on the spectral characteristics (380-700 nm) of cyanidin and acylated cyanidin derivatives were evaluated to better understand the color evolution of anthocyanin-metal chelates in pH 3-8. In all pH, anthocyanins exhibited bathochromic and hyperchromic shifts. Largest bathochromic shifts most often occurred in pH 6; while largest hyperchromic shifts occurred in pH 5. Divalent Mg2+ showed no observable effect on anthocyanin color while trivalent metal ions caused bathochromic shifts and hue changes. Generally, bathochromic shifts on anthocyanins were greatest with more electron rich metal ions (Fe3+ approximate to Ga3+ > Al3+ > Cr3+). (C) 2016 Elsevier Ltd. All rights reserved.
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