Non-destructively determining of peel thickness and pulp percentage in blood orange ‘Tarocco’ granulated juice sacs using visible / near-infrared spectroscopy
2020
Itou, F. | Oouchi, Y. | Ochi, H.
Granulation of Juice Sacs in blood orange ‘Tarocco’ occurred in Ehime. We examined the accuracy of non-destructive measurement using visible / near-infrared spectroscopy for peel thickness and pulp percentage, which are highly correlated with the degree of granulation. Irradiated with visible / near-infrared light (500～1010nm), non-destructive measurement of diffuse reflected light at two places in the fruit equator. After that, multivariate analysis was performed to create a multiple linear regression equation calibration curve. The calibration curve for peel thickness composed of five wavelengths had a correlation coefficient of 0.911, bias-corrected standard error of prediction of 0.452, and the average of difference between actual predicted of 0.072. Similarly, the calibration curve for the pulp percentage had a correlation coefficient of 0.940, bias-corrected standard error of prediction of 2.350, and the average of difference between actual predicted of 0.117. The measurement accuracy of the two calibration curves was good.
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