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      New C-deoxyhexosyl flavones and antioxidant properties of Passiflora edulis leaf extract.

      Journal of Agricultural and Food Chemistry
      Antioxidants, analysis, pharmacology, Apigenin, chemistry, Chromatography, High Pressure Liquid, Flavones, Glycosylation, Luteolin, Passiflora, Plant Leaves, Tandem Mass Spectrometry

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          Abstract

          The flavonoids present in passion fruit (Passiflora edulis) leaves were identified by a high-performance liquid chromatography-diode array detection-tandem mass spectrometry (HPLC-DAD-MS/MS) method. Sixteen apigenin or luteolin derivatives were characterized, which included four mono-C-glycosyl, eight O-glycosyl- C-glycosyl, and four O-glycosyl derivatives. With the exceptions of C-hexosyl luteolin and C-hexosyl apigenin, all the compounds exhibited a deoxyhexose moiety. Moreover, the uncommon C-deoxyhexosyl derivatives of luteolin and apigenin have been identified for first time in P. edulis by HPLC-DAD-MS/MS. The antioxidative capacity of passion fruit leaves was checked against DPPH radical and several reactive oxygen species (superoxide radical, hydroxyl radical, and hypochlorous acid), revealing it to be concentration-dependent, although a pro-oxidant effect was noticed for hydroxyl radical.

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