SUMMARY The flavonoid and anthocyanin pigments were isolated and identified in three onion cultivars: Southport Yellow Globe, Southport White Globe, and Southport Red Globe. All three varieties contain quercetin‐4′‐glucoside, quercetin‐3,4′‐diglucoside, quercetin‐4′,7‐diglucoside, and quercetin‐3‐glucoside. In addition, Southport Yellow Globe contains quercetin, and Southport Red Globe contains quercetin and peonidin‐3‐arabinoside.
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Bernard Jay Brandwein (1965) studied this question.
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