Potential of Non-destructively Detefmining the Purple Color of Flesh in Blood Oranges using Visible/near-Infrared Spectroscopy

概要

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The blood orange (Citrus sinensis) is one of the sweet orange cultivars, and its flesh color changes orange to purple. Anthocyanins impart the characteristic purple color of the flesh, and one of the primary anthocyanins is cyanidin-3-glucoside. The purple color is attractive and valuable to consumers, and the anthocyanins have antioxidants. However, it is difficult to judge this purple-colored flesh from the external appearance of the blood orange. Therefore, the objective of this study is to assess the potential of non-destructively determining the purple-colored flesh in blood oranges using visible (Vis) / near-infrared (NIR) spectroscopy. Multiple linear regression (MLR) analyses of the spectra (500 nm -1000 nm) of intact blood oranges (n = 48) gave a calibration equation that uses absorbance at 508 nm, 580 nm, 606 nm, and 834 nm with a multiple correlation coefficient of 0.87. The MLR calibration was validated by using other blood orange sample lots, and the intact blood oranges were predicted well. Therefore, VIS / NIR technology is a potentially effective way to non-destructively determine the purple color of the flesh in blood oranges.
社団法人照明学会の論文