Colour Interval Value Publication Food Name Reference
[ 0.00, 1.80 ) 0.00 mg/100 g FW Red onion - Edible portion Kiviranta J., et al (1988) Variation of the phenolic substances in .... Acta Pharmaceutica Fennica 97:67-72
[ 1.80, 3.61 ) 3.60 mg/100 g FW Red onion - Middle part - Allium cepa L. - SRG Tsushida T., et al (1996) Flavonoid in fruits and vegetables. II. .... Journal of the Japanese Society for Food Science and Technology 43:642-649