PERTANIKA JOURNAL OF TROPICAL AGRICULTURAL SCIENCE

A method for the extraction of betacyanins pigments of dragon fruit (Hylocereus polyrhizus) grown in Malaysiawas studied. A processing scheme consisting of solvent system selection (ethanolic and aqueous ethanolic)was proposed to study the effect of water in enhancing betacyanin recovery from the pulp of H. polyrhizusfruit. Betacyanins, in concentrated extracts from the dragon fruit (H. polyrhizus), were identified as betanin,phyllocactin, hylocerenin and their respective C-15 isoforms using High-performance liquid chromatographic(HPLC) analysis. Structural alteration was monitored by using selected solvent systems. As for the relativepeak area ratios, some betacyanins showed a higher stability than others. Betanin, one of the main betacyanin inselected Malaysian H. polyrhizus cultivars, displayed the most stable structure. Comparing the peak area ratiosof individual betacyanins, it was noticed that ethanolic assay might induce co-occuring of the C-15 isoforms.