Level of Catechin, Myricetin, Quercetin and Isoquercitrin in Buckwheat (Fagopyrum esculentum Moench), Changes of Their Levels during Vegetation and Their Effect on The Growth of Selected Weeds

Abstract

Buckwheat is well-known as a crop rich in flavonoids, however, attention has usually only been paid to the main flavonoid rutin as an important natural antioxidant or as a possible allelopathic compound. Therefore, some of the other constituents found within individual plant parts of buckwheat (isoquercitrin, quercetin, catechin, and myricetin), as well as changes of their level during the growing season, were determined by HPLC analysis. The effects of these compounds on plant growth were proved on seven plant species. In buckwheat, isoquercitrin represented the largest component of the selected compounds. The strongest inhibitive effects on the growth of those selected plants were produced by catechin. Quercetin and isoquercitrin had weak inhibitive effects. Myricetin did not show any influence on plant growth. Hence we suppose that myricetin, isoquercetin and quercetin do not have important function in allelopathy of buckwheat. Buckwheat as row material for functional foods could be a significant source of another antioxidant, isoquercitrin.

Weed Suppression by Common Buckwheat: A Review

“…This is mainly due to its important concentration in the aboveground organs of buckwheat (on average 50.5 mg g 1 DW (Golisz et al, 2007)). Once in the soil however, the disaccharide moiety of rutin may be hydrolyzed to give rhamnose, glucose and quercetin (Kalinova and Vrchotova, 2009) whose specific activity (EC50) is approximately 8 times higher than rutin and therefore much less phytotoxic (Golisz et al, 2007). Rutin was found to induce oxidative stress in Arabidopsis (Arabidopsis thaliana) (Golisz et al, 2008), while quercetin was identified as a potent inhibitor of the photosystem II and ATPase of spinach (Spinacia oleracea) (Moreland and Novitzky, 1988).…”

Response surface modeling and optimization of ultrasound-assisted extraction of three flavonoids from tartary buckwheat (Fagopyrum tataricum)

“…[14] Rutin and quercetin are the most intensely studied flavonoids in tartary buckwheat, due to their functions and high concentrations. [15161718]…”

Fagopyrins and Protofagopyrins: Detection, Analysis, and Potential Phototoxicity in Buckwheat

“…19 The most promising isolation approach appears to be reported by Samel, 23 but our unpublished reproduction of their procedure was unsuccessful, as we were unable to elute a fluorescent fraction from silica gel 60 with any solvent. 23 In all reported isolation attempts, effective extraction solvents for fagopyrins are evidently highly (5), protofagopyrin (6), and fagopyrin (7). unspecific and are difficult to evaporate due to their high boiling points.…”