Kalinova Jana, Vrchotova Nadezda
Faculty of Agriculture, University of South Bohemia, Studentska 13, 370 05 Ceske Budejovice, Czech Republic.
J Agric Food Chem. 2009 Apr 8;57(7):2719-25. doi: 10.1021/jf803633f.
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.
荞麦作为一种富含黄酮类化合物的作物而闻名，然而，人们通常只关注主要的黄酮类化合物芦丁，将其视为一种重要的天然抗氧化剂或一种可能的化感化合物。因此，通过高效液相色谱分析确定了荞麦各个植物部位中发现的一些其他成分（异槲皮苷、槲皮素、儿茶素和杨梅素），以及它们在生长季节的含量变化。在七种植物物种上证明了这些化合物对植物生长的影响。在荞麦中，异槲皮苷是所选化合物中含量最大的成分。儿茶素对所选植物的生长产生了最强的抑制作用。槲皮素和异槲皮苷的抑制作用较弱。杨梅素对植物生长没有任何影响。因此我们推测，杨梅素、异槲皮素和槲皮素在荞麦化感作用中没有重要作用。作为功能性食品原料的荞麦可能是另一种抗氧化剂异槲皮苷的重要来源。
