Colour Interval Value Publication Food Name Reference
[ 1.97, 2.91 ) 1.97 mg/100 g FW Lettuce - Red oak leaf DuPont, et al (2000) Effect of variety, processing, and stora.... Journal of Agricultural and Food Chemistry 48:3957-3964 PubMed (10995297)
[ 2.91, 3.86 ) 3.85 mg/100 g FW Lettuce - Red - Lollo rosso - Malibu DuPont, et al (2000) Effect of variety, processing, and stora.... Journal of Agricultural and Food Chemistry 48:3957-3964 PubMed (10995297)