Quercetin-3-o-rutinose

Electrochemistry of catechol-containing flavonoids.[Pubmed:8031931]

J Pharm Biomed Anal. 1994 Mar;12(3):325-34.

The electrochemical properties of four structurally related flavonoids, quercetin, quercetin-3-O-rhamnose (quercitrin), Quercetin-3-o-rutinose (rutin) and luteolin were investigated. These flavonoids were shown to undergo homogenous chemical reactions following oxidation at a glassy carbon electrode. These reactions were studied using cyclic voltammetry and rotating ring-disk voltammetry. Both first-order and zero-order processes were observed. The rate of the zero-order process was strongly dependent on the substituent at the C-3 position of the flavonoid. The rate of the first-order process was independent of substitution. Two products were observed using liquid chromatography. These products did not correspond to previously reported products of enzymatic oxidation. The products were not stable under conditions for isolation.

The inhibitory effects of 12 medicinal plants and their component compounds on lipid peroxidation.[Pubmed:14992543]

Am J Chin Med. 2003;31(6):907-17.

The antioxidative activities of 12 medicinal plants and the compounds isolated from them were investigated using the thiocyanate method to evaluate inhibitory effects on lipid peroxidation in the linoleic acid system. The peroxide levels gradually increased during incubation in the presence of linoleic acid over 3 days, and most of the plants inhibited lipid peroxidation. In particular, of the plants tested, Cudrania tricuspidata, Zanthoxylum piperitum, Houttuynia cordata and Ulmus parvifolia reduced lipid peroxidation more effectively as lipid peroxidation progressed, resulting in inhibition of about 80% relative to the control value by the 3rd day of incubation. In addition, the polyphenols isolated from the plants also showed marked and dose-dependent inhibitory effects on lipid peroxidation. The compounds with the strongest activities were 3,4-dihydroxylbenzoic acid, quercetin, the quercetin glycosides quercetin-3-O-beta-D-galactoside, quercetin-3-O-alpha-L-rhamnoside, quercetin-3-O-beta-D-glucoside and Quercetin-3-o-rutinose, catechin, gallic acid, methyl gallate and rosamultin isolated from Zanthoxylum piperitum, Houttuynia cordata, Rosa rugosa and Cedrela sinensis. Moreover, quercetin glycosides showed stronger activity than quercetin, suggesting that glycosylation increases the antioxidative activity of quercetin. Our results indicate that the medicinal plants and their polyphenols show promise as therapeutic agents for various disorders involving free radical reactions.

Study on the inhibitory effects of Korean medicinal plants and their main compounds on the 1,1-diphenyl-2-picrylhydrazyl radical.[Pubmed:13678241]

Phytomedicine. 2003;10(6-7):544-51.

A 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical-generating system was used to evaluate the antioxidant properties of Korean medicinal plants that have been used widely as folk medicines for several disorders, as well as compounds isolated from them. Among the Rosaceae, Rosa rugosa and Rosa davurica showed strong DPPH radical-scavenging activity. The most effective medicinal plant from families other than Rosaceae was Cedrela sinensis, followed in order by Nelumbo nucifera, Eucommia ulmoides, Zanthoxylum piperitum, Cudrania tricuspidata and Houttuynia cordata. These results serve as a good index of the free radical-scavenging activities of Korean medicinal plants. Furthermore, the polyphenols isolated from these plants, procyanidin B-3, (+)-catechin, gallic acid, methyl gallate, quercetin, quercetin-3-O-beta-D-glucoside, quercetin-3-O-beta-galactoside, Quercetin-3-o-rutinose and kaempferol, exerted strong DPPH radical-scavenging activity. These results suggest that the Korean medicinal plants and the polyphenols isolated from them that exhibited effective radical-scavenging activity may be promising agents for scavenging free radicals and treating diseases associated with excess free radicals.