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Betanin and isobetanin from purple pitaya fruits originating from Israel, commercial red beet samples from Germany and France, as well as from a commercial pigment extract, respectively, were isolated by column chromatography and semi-preparative HPLC. Their δ 13 C V-PDB and δ 2 H V-SMOW values were determined by Elemental Analyser-Isotope Ratio Mass Spectrometry in...
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