myricitrin and 1-1-diphenyl-2-picrylhydrazyl

myricitrin has been researched along with 1-1-diphenyl-2-picrylhydrazyl* in 2 studies

Other Studies

2 other study(ies) available for myricitrin and 1-1-diphenyl-2-picrylhydrazyl

Article	Year
Antioxidant Flavonols and Phenolic Compounds from Atraphaxis frutescens and Their Inhibitory Activities against Insect Phenoloxidase and Mushroom Tyrosinase. Journal of natural products, 2016, Dec-23, Volume: 79, Issue:12 Chemical investigation of the aerial parts of Atraphaxis frutescens resulted in the isolation of five 7-methoxyflavonols with pyrogallol B-ring moieties (1-5), a fisetinidol glucoside (13), and a benzyl glycoside (18), together with 26 known compounds including flavonoids, phenylpropanoid amides, anthraquinone glycosides, lignans, and a benzyl derivative. The principal chemical structural feature of the isolated compounds was either a pyrogallol or catechol B-ring moiety, and they showed potent 1,1-diphenyl-2-picrylhydrazyl radical scavenging activities. To assess the effects of these antioxidants on biological enzymes, their inhibitory effects against an insect phenoloxidase and a mushroom tyrosinase were evaluated. This study indicated that insect phenoloxidase was inhibited by phenylpropanoid amides and that mushroom tyrosinase was inhibited by the characteristic 7-methoxyflavonol 3-O-rhamnopyranosides. Topics: Agaricales; Animals; Antioxidants; Aphids; Biphenyl Compounds; Catechol Oxidase; Flavonols; Glucosides; Molecular Structure; Mongolia; Monophenol Monooxygenase; Nuclear Magnetic Resonance, Biomolecular; Phenols; Picrates; Plant Components, Aerial; Polygonaceae	2016
Enzymatic production of highly soluble myricitrin glycosides using beta-galactosidase. Bioscience, biotechnology, and biochemistry, 2006, Volume: 70, Issue:4 Myricitrin, a botanical flavonol glycoside, could be a useful ingredient of functional foods, cosmetics, and medicines because of its high anti-oxidative activity. However, due to its insolubility in water, it has a limited range of use. To improve this solubility, we glycosylated myricitrin by an enzymatic transglycosylate reaction. Myricitrin was galactosylated by beta-galactosidase from Bacillus circulans using lactose as a sugar donor. The reaction product was 480 times more soluble than myricitrin. Four myricitrin galactosides were isolated from the reaction products by column chromatography, and their molecular structures were identified by using ESI-MS, 1H-NMR, 13C-NMR, 1H-1H COSY, 1H-13C HMQC and 1H-13C HMBC analysis. The solubility of these four myricitrin galactosides was more than 3.9 x 10(3) fold that of myricitrin, and each had similar anti-oxidative activity to that of myricitrin. Topics: Bacillus; beta-Galactosidase; Biphenyl Compounds; Chromatography, High Pressure Liquid; Flavonoids; Free Radicals; Glycosides; Hydrazines; Lipid Peroxidation; Magnetic Resonance Spectroscopy; Molecular Structure; Picrates; Solubility; Spectrometry, Mass, Electrospray Ionization; Water	2006

Article

Year

Antioxidant Flavonols and Phenolic Compounds from Atraphaxis frutescens and Their Inhibitory Activities against Insect Phenoloxidase and Mushroom Tyrosinase.

Journal of natural products, 2016, Dec-23, Volume: 79, Issue:12

Chemical investigation of the aerial parts of Atraphaxis frutescens resulted in the isolation of five 7-methoxyflavonols with pyrogallol B-ring moieties (1-5), a fisetinidol glucoside (13), and a benzyl glycoside (18), together with 26 known compounds including flavonoids, phenylpropanoid amides, anthraquinone glycosides, lignans, and a benzyl derivative. The principal chemical structural feature of the isolated compounds was either a pyrogallol or catechol B-ring moiety, and they showed potent 1,1-diphenyl-2-picrylhydrazyl radical scavenging activities. To assess the effects of these antioxidants on biological enzymes, their inhibitory effects against an insect phenoloxidase and a mushroom tyrosinase were evaluated. This study indicated that insect phenoloxidase was inhibited by phenylpropanoid amides and that mushroom tyrosinase was inhibited by the characteristic 7-methoxyflavonol 3-O-rhamnopyranosides.

Topics: Agaricales; Animals; Antioxidants; Aphids; Biphenyl Compounds; Catechol Oxidase; Flavonols; Glucosides; Molecular Structure; Mongolia; Monophenol Monooxygenase; Nuclear Magnetic Resonance, Biomolecular; Phenols; Picrates; Plant Components, Aerial; Polygonaceae

2016

Enzymatic production of highly soluble myricitrin glycosides using beta-galactosidase.

Bioscience, biotechnology, and biochemistry, 2006, Volume: 70, Issue:4

Myricitrin, a botanical flavonol glycoside, could be a useful ingredient of functional foods, cosmetics, and medicines because of its high anti-oxidative activity. However, due to its insolubility in water, it has a limited range of use. To improve this solubility, we glycosylated myricitrin by an enzymatic transglycosylate reaction. Myricitrin was galactosylated by beta-galactosidase from Bacillus circulans using lactose as a sugar donor. The reaction product was 480 times more soluble than myricitrin. Four myricitrin galactosides were isolated from the reaction products by column chromatography, and their molecular structures were identified by using ESI-MS, 1H-NMR, 13C-NMR, 1H-1H COSY, 1H-13C HMQC and 1H-13C HMBC analysis. The solubility of these four myricitrin galactosides was more than 3.9 x 10(3) fold that of myricitrin, and each had similar anti-oxidative activity to that of myricitrin.

Topics: Bacillus; beta-Galactosidase; Biphenyl Compounds; Chromatography, High Pressure Liquid; Flavonoids; Free Radicals; Glycosides; Hydrazines; Lipid Peroxidation; Magnetic Resonance Spectroscopy; Molecular Structure; Picrates; Solubility; Spectrometry, Mass, Electrospray Ionization; Water

2006