Flavonole und Flavone der Gemüsearten

Distribution of quercetin and kaempferol in lettuce, kale, chive, garlic chive, leek, horseradish, red radish, and red cabbage tissues

“…Herrmann (1976) reported more kaempferol than quercetin in a German variety of kale, "Halbhoher griiner extra-krauser". Quercetin and kaempferol levels reported in this study generally were less than those found by Herrmann and co-workers (Wildanger and Herrmann, 1973b;Eloesser and Herrmann, 1975;Starke and Herrmann, 1976). Van der Hoeven et al (1983) detected mutagenic properties in extracts of lettuce and other vegetables by means of the Ames test.…”

“…of flavonol determination was based on separation by HPLC, while Woldecke and Herrmann carried out photometric analyses of bands separated by TLC (Wildanger and Herrmann, 1973a). This procedural difference as well as the characteristics of the varieties examined may explain the difference between our results and those reported by Herrmann and co-workers.…”

Basis for the new challenges of growing broccoli for health in hydroponics

“…The flavonoids in greenhouse‐grown broccoli are stated to be present at lower levels than in field cultures 23. Broccoli produced in late summer and early autumn field crops in different parts of Europe presented different flavonol contents, ranging from 1.5–6.5 mg 100 g −1 fresh weight8 to 5.7–9.6 mg 100 g −1 fresh weight (‘Marathon’ broccoli) 4.…”

Flavonols and flavones in food plants: a review†

“…Ryan & Coffin (1971) Cansfield & Francis (1970) RibCreau-Gayon ( 1964) Since the formation of flavonol glycosides depends on light, it is not surprising that they are found mainly in the skins of fruits (Workman, 1963;Walker, 1964;Wildanger & Herrmann, 1973b). Their distribution in pome fruits is summarized in Table 3.…”

“…Blackcurrants contain mainly delphinidin, corresponding to myricetin, and only small quantities of cyanidin. In 1971 and 1974 we found in 'Rosenthals langtraubige Schwarze' 55 and 43 mg/kg myricetin and in 1973 and 1974 in 'Silvergieters Schwarze' 95 and 41 mg/kg myricetin calculated on the fresh weight of the fruit (Wildanger & Herrmann, 1973b;Starke & Herrmann, 1976b). These flavonols occur in the form of glycosides.…”