Onions, quercetin and human health: the effects of growing and storage conditions

A study which shows the effect of growing and storage conditions on the concentration of the antioxidant quercetin in onions.

Year of Publication2011

Onions contain the compound quercetin which is linked to health benefits such as a lower incidence of cardiovascular disease and of some cancers. A study of the effect of growing and storage conditions on quercetin concentration found that it was highest in crops given low rates of nitrogen fertiliser and in those exposed to the greatest sunlight in August both whilst growing and after harvest. Quercetin remained very stable during storage.

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