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The researchers report that they haven't yet isolated the compound in the scallops that reacts with the wine, but they suspect it's an unsaturated fatty acid, which could be breaking down rapidly and releasing the decaying fish smell when exposed to iron. How much iron a wine contains depends on the amount in the soil where the grapes were grown, as well as other factors such as how the grapes are harvested and processed. Red wine tends to have a higher iron content, hence the admonition against mixing it with seafood.
