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Flavonoids are rich in  Juglans regia  L. leaves. They have potent antioxidant properties, which have been related to regulating immune function and enhancing anticancer activity. Herein, qualitative and quantitative determination of flavonoids from  J. regia  leaves was carried out using high performance liquid chromatography coupled with tandem mass spectrometry with electrospray ionization and negative ion detection (HPLC-ESI-MS/MS) by comparison of the retention times and mass spectral fragments with standard substances or related literatures. Seventeen compounds were identified and major components are quercetin-3-O-rhamnoside (453.11  μ g/g, dry weight), quercetin-3-O-arabinoside (73.91  μ g/g), quercetin-3-O-xyloside (70.04  μ g/g), kaempferol-O-pentoside derivative (49.04  μ g/g), quercetin-3-O-galactoside (48.61  μ g/g), and kaempferol-O-pentoside (48.46  μ g/g). The  in vitro  intracellular antioxidation indicated that flavonoids from  J. regia  leaves could reduce the reactive oxygen species (ROS) level in RAW264.7 cells and showed good radical scavenging activities. These results proved to be more related to the flavonoids that could be considered in the design of new formulations of dietary supplements or functional foods.

Flavonoids inJuglans regiaL. Leaves and Evaluation ofIn VitroAntioxidant Activity via Intracellular and Chemical Methods