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The antioxidant activity of flavonoids depends on the availability of the donation of phenolic hydrogens (Rice-Evans et al
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C.-W.HungH.-F.LiC.-H.et al (2007)
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The researchers also used ultra-performance liquid chromatography coupled with diode array detection and electrospray ionization mass spectrometry (UPLC-DAD-MS) to identify differences in natural metabolites derived from different plant sources (Tang et al., 2013
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