A phytochemical study was undertaken on the
internal leaves of tronchuda cabbage (Brassica oleracea L. var. costata DC). Seventeen phenolic compounds were
characterized and quantified by reversed-phase HPLCDAD-ESI-MSn and HPLC/DAD, respectively: quercetin 3-O-sophoroside-7-O-glucoside, 3-p-coumaroylquinic acid,
kaempferol 3-O-sophoroside-7-O-glucoside, kaempferol
3-O-(caffeoyl)-sophoroside-7-O-glucoside, sinapoyl glucoside
acid, kaempferol 3-O-(sinapoyl)-sophoroside-7-Oglucoside,
kaempferol 3-O-(feruloyl)-sophoroside-7-Oglucoside,
kaempferol 3-O-(p-coumaroyl)-sophoroside-
7-O-glucoside, 4-p-coumaroylquinic acid, sinapic acid,
kaempferol 3-O-sophoroside, 3 isomeric forms of 1,2-
disinapoylgentiobiose, 1-sinapoyl-2-feruloylgentiobiose,
1,2,2-trisinapoylgentiobiose and 1,2'-disinapoyl-2-feruloylgentiobiose.
Seven organic acids (aconitic, citric,
ascorbic, malic, quinic, shikimic and fumaric acids) were
also identified and quantified. The hot water extract of
tronchuda cabbage internal leaves was investigated for its capacity to act as a scavenger of DPPH- radical and reactive
oxygen species (superoxide radical, hydroxyl radical
and hypochlorous acid), exhibiting antioxidant capacity in
a concentration dependent manner against all radicals.
