Betalain profile, phenolic content, and color characterization of different parts and varieties of opuntia ficus-indica

Description

Three different varieties of Opuntia ficus-indica (R, red; Y, yellow; RY, red-yellow) have been considered in this study. Attention was focused on differential tristimulus colorimetry and on the analysis of individual betalains (HPLC-DAD-ESI-ToF-MS) and phenolic content, scarcely previously reported in these kinds of samples. The importance of this research stems from the elucidation of the parts and varieties of cactus pear more optimal for use as natural colorants and sources of phenolics and betalains. Thus, the RY pulp was appropriate to obtain colorants with high color intensity (Cab = 66.5), whereas the whole Y fruit and R pulp reached powerful and stable yellow and red colors, respectively (Cab/hab, 57.1/84.7 and 61.1°/81.8°). This choice was also based on the visually appreciable differences (ΔEab > 5) among samples, mainly quantitative (%Δ2L, %Δ2C). In addition, seeds of all Opuntia varieties showed significantly (p < 0.05) similar phenolic content (around 23.3 mg/g) and color characteristics.

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