0000000000849263

AUTHOR

Xiumei Wu

showing 3 related works from this author

Synthesis and antioxidant evaluation of novel silybin analogues

2006

In this work, we evaluated the antioxidant properties of the eight novel silybin analogues for their capacity to scavenge free radicals including superoxide anion radicals and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals in vitro. Compound 7d demonstrated an excellent antioxidant effect in scavenging superoxide anion free radical with an IC50 value of 26.5 microM, while the IC50 of quercetin (the reference compound) was 38.1 microM. Compounds 7b, 7e, 7h showed certain scavenging activities for both types of free radicals.

AnionsAntioxidantDPPHRadicalmedicine.medical_treatmentDrug Evaluation PreclinicalMedicinal chemistryAntioxidantsInhibitory Concentration 50chemistry.chemical_compoundPicratesSuperoxidesDrug DiscoverymedicineOrganic chemistryIC50PharmacologyDose-Response Relationship DrugSuperoxideBiphenyl CompoundsAnion radicalsFree Radical ScavengersGeneral MedicineIn vitroHydrazinesModels ChemicalchemistrySpectrophotometrySilybinQuercetinQuercetinSilymarinJournal of Enzyme Inhibition and Medicinal Chemistry
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Preparation of C-23 esterified silybin derivatives and evaluation of their lipid peroxidation inhibitory and DNA protective properties.

2009

A diverse series of C-23 esterified silybin derivatives (1a-n) were designed and synthesized. The antioxidative properties of these compounds were evaluated by 1,1-diphenyl-2-picrylhydrazyl (DPPH) and superoxide anion radical scavenging, ferrous ion chelation, and inhibition of rat liver homogenate lipid peroxidation. Their protective effects on the prevention of hydrogen peroxide induced DNA damage were also investigated. Most of the synthesized compounds exhibited more effective antioxidant activities than silybin. The esterified silybin analogues displayed satisfactory performance especially on iron chelation and antiperoxidative activity. Compound 1n in particular exhibited remarkable a…

AntioxidantDNA damageDPPHmedicine.medical_treatmentClinical BiochemistryPharmaceutical ScienceSilibininBiochemistryLipid peroxidationchemistry.chemical_compoundStructure-Activity RelationshipDrug DiscoverymedicineAnimalsChelationMolecular BiologyChemistryOrganic ChemistryFree Radical ScavengersFree radical scavengerRatsBiochemistrySilybinMolecular MedicineLipid PeroxidationQuercetinNuclear chemistryDNA DamageSilymarinBioorganicmedicinal chemistry
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Preparation of two sets of 5,6,7-trioxygenated dihydroflavonol derivatives as free radical scavengers and neuronal cell protectors to oxidative damag…

2009

An unusual class of 5,6,7-trioxygenated dihydroflavonols (3a-e and 4a-j) were designed and prepared. Their antioxidative properties were assessed by examining their capacities in several in vitro models, including superoxide anion and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging, rat liver homogenate lipid peroxidation inhibition, PC12 cells protection from oxidative damage, and xanthine oxidase inhibition. These dihydroflavonols displayed positive quenching abilities towards O(2)(-) and DPPH free radicals, in which the majority exhibited superior antioxidant properties to Vitamin C. cis-Configurated compound (+/-)-3e demonstrated remarkable inhibition to LPO with an IC(50) value…

Models MolecularXanthine OxidaseAntioxidantFlavonolsmedicine.drug_classDPPHmedicine.medical_treatmentClinical BiochemistryMolecular ConformationPharmaceutical Sciencemedicine.disease_causeBiochemistryPC12 CellsAntioxidantsLipid peroxidationRats Sprague-Dawleychemistry.chemical_compoundStructure-Activity RelationshipDrug DiscoverymedicineAnimalsXanthine oxidaseMolecular BiologyXanthine oxidase inhibitorNeuronsSuperoxideOrganic ChemistryFree Radical ScavengersFree radical scavengerRatschemistryBiochemistryMolecular MedicineLipid PeroxidationReactive Oxygen SpeciesOxidative stressBioorganicmedicinal chemistry
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