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Annulatin
Annulatin is an O-methylated flavonol found in the roots of ''Pteroxygonum giraldii ''Pteroxygonum giraldii'' is a species of flowering plant in the family Polygonaceae, endemic to the China, Chinese provinces of Gansu, Hebei, Henan, Hubei, Shaanxi, Shanxi, and Sichuan. It is found at altitudes of . It grows to more than in hei ...''.Antioxidant Flavone Glycosides from the Root of Pteroxygonum giraldii. Bao-Lin Li, Zhan-Jun Yang, Lin-Ling Jiang, Xi-Quan Zhang, Hong-Mei Gu, Hui-Chun Wang and Xian-Hua Tian, Bull. Korean Chem. Soc. 2009, Vol. 30, No. 7, pp. 1459-1462, References O-methylated flavonols {{aromatic-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
O-methylated Flavonol
The O-methylated flavonoids or methoxyflavonoids are flavonoids with methylations on hydroxyl groups (methoxy bonds). O-methylation has an effect on the solubility of flavonoids. Enzymes O-methylated flavonoids formation implies the presence of specific O-methyltransferase (OMT) enzymes which accept a variety of substrates. Those enzymes mediate the O-methylation on a specific hydroxyl group, like on 4' (example in ''Catharanthus roseus'') or 3' (example in rice) positions. Those positions can be ortho, meta, para and there can be a special 3-O-methyltransferase for the 3-OH position. Calamondin orange ('' Citrus mitis'') exhibits all of those activities. Plant enzymes * Apigenin 4'-O-methyltransferase * 8-hydroxyquercetin 8-O-methyltransferase * Isoflavone 4'-O-methyltransferase * Isoflavone 7-O-methyltransferase * Isoliquiritigenin 2'-O-methyltransferase * Isoorientin 3'-O-methyltransferase * Kaempferol 4'-O-methyltransferase * Luteolin O-methyltransferase * Methylquercet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pteroxygonum Giraldii
''Pteroxygonum giraldii'' is a species of flowering plant in the family Polygonaceae, endemic to the China, Chinese provinces of Gansu, Hebei, Henan, Hubei, Shaanxi, Shanxi, and Sichuan. It is found at altitudes of . It grows to more than in height, with leaf blades triangular or triangular-ovate in shape, by . References * "Reappraisal of the generic status of ''Pteroxygonum'' (Polygonaceae) on the basis of morphology, anatomy and nrDNA ITS sequence analysis", Wei SUN et al., ''Journal of Systematics and Evolution'' 46 (1): 73–79 (2008)eFloras description Polygonoideae Taxa named by Carl Lebrecht Udo Dammer Taxa named by Ludwig Diels {{Polygonaceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |