title: Liquid chromatography-mass spectrometry identification of anthocyanins of isla oca (Oxalis tuberosa, Mol.) tubers.
abstract: High-performance liquid chromatography (HPLC)-diode array detection (DAD)-mass spectrometry (MS) techniques have been successfully employed in the identification of the anthocyanins of the coloured tubers of isla oca (Oxalis tuberosa), the second most cultivated tuber in the Andean region. Tubers underwent a pre-treatment step in order to inhibit enzymatic reactions and to obtain a stable powder or "concentrate". This concentrate was dissolved, purified and then analysed. Eight different compounds were found. The major peaks were malvidin glucosides (malvidin 3-O-glucoside and 3,5-O-diglucoside). The rest of the peaks were 3,5-O-diglucosides of petunidin and peonidin, and 3-O-glucosides of delphinidin, petunidin and peonidin. Only malvidin 3-O-acetylglucoside-5-O-glucoside was found as an acylated anthocyanin.
authors.affiliation: Unidad de Nutrición y Bromatología, Facultad de Farmacia, Universidad de Salamanca, Campus Miguel de Unamuno, 37007 Salamanca, Spain.
authors.forename: Cristina
authors.initials: C
authors.lastname: Alcalde-Eon
authors.forename: Gloria
authors.initials: G
authors.lastname: Saavedra
authors.forename: Sonia
authors.initials: S
authors.lastname: de Pascual-Teresa
authors.forename: Julián C
authors.initials: JC
authors.lastname: Rivas-Gonzalo
mesh_terms: D000872:Anthocyanins / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D019684:Magnoliopsida / Q000737:chemistry*; D013058:Mass Spectrometry / Q000379:methods*
chemical_list: D000872:Anthocyanins