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South African
Wine Lab Association:

The Effect of Copper Ions on Colour in Extracts of Cabernet Sauvignon and Sangiovese Skins Under Wine-like Conditions

L. Rustioni

Pigment-metal complexes are generally not considered to play significant roles in grape and wine colour.
However, to the best of my knowledge, this hypothesis has never been investigated. In this work, grape skin
extracts (cultivars Sangiovese and Cabernet Sauvignon) were allowed to react with copper sulphate aqueous
solutions at different concentrations. High, and toxic, copper additions produced significant absorption
increases in the green spectral region (corresponding to the typical absorption band of anthocyanins).
Further studies will be necessary to characterise the nature of this interaction.

Grape pigments, coloured complexes, metals, interactions, malvidin

Full article

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