QuercetinFlavonolsFlavonoidsOnionsAntioxidantsChromatography, High Pressure LiquidDose-Response Relationship, DrugGlycosidesArea Under CurveHalf-LifePlant ExtractsElectrophoresis, Polyacrylamide GelRecombinant ProteinsEscherichia coliAdministration, OralHaemophilus parainfluenzaeKineticsChromatography, AffinityFlavanonesPhenolsPolyphenolsLiverCatechinLevofloxacin