Lollo rosso

Substantial quantities of luteolin-7-O-glucuronide, luteolin-7-O-glucoside, and luteolin-7-O-rutinoside occur in Red Oak Leaf and Lollo Rosso, two red-leaved varieties of lettuce (Lactuca sativa) [Llorach et al., 2008], Polymethoxylated flavones such as nobiletin, scutellarein, sinensetin, and tangeretin (Fig. 1.8) are found exclusively in citrus species [Crozier et al., 2006c], while diosmetin-7-O-glucuronide has been isolated from the fruits of a Chinese herb, Luffa cylindrical. 

The red-leaved lettuce Lollo Rosso contains the hydroxycinammates caf-feoyltartaric acid, dicaffeoyltartaric acid, 5-O-caffeoylquinic acid, and 3,5-0-dicaffeoylquinic acid (Fig. 1.31) [Ferreres et al., 1997]. 5-O-Caffeoylquinic acid has also been detected in tomatoes [Paganga et al., 1999]. 

GIL MI, castaner m, FERRERES, F, ARTES F and tomAs-b, FA. 1998. Modified atmosphere packaging of minimally processed Lollo Rosso (Lactuca sativa). Phenolic metabolites and quality changes. Z Lebensm Unters Forsch. 206 350-354. 

The quercetin content of lettuce cultivars purchased in the market in The Netherlands ranged from 2 to 30 mg/kg f.w. [68]. In a recent survey of the quercetin contents of lettuce cultivars purchased in the U.K., head lettuce cultivars again contained the smallest amounts (11 mg/kg). Green leaf lettuce cultivars (e.g. Green salad ) contained 147 mg/kg, while red cultivars like Lollo Rosso contained the highest amounts 91 Img / kg in external leaves and 450mg / kg in inner leaves [49]. 

Fig. 8 shows typical HPLC chromatograms of Lollo rosso phenolics, and Fig. 9 a characteristic chromatogram of Romaine lettuce. The main difference in the phenolic compound patterns of both lettuce types is that... 

Lollo rosso contains large amounts of flavonoids and anthocyanins, while Romaine only presents small amounts of caffeic acid derivatives. Thus, the antioxidant activity of Lollo rosso should be much more important than that of Romaine. ... 

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