Prediction of α-Solanine and α-Chaconine in Potato Tubers from Hunter Color Values and VIS/NIR Spectra

Table 1

Statistics for calibration and prediction of α-solanine (mg kg⁻¹) using potato tubers color variables.

Set	Parameters	Sample number	Mean	Range	SD	R^2	RMSEC	RPD
Calibration	Reference α-solanine	960	32.40	1.70–129.46	29.28	—	—	—
	Hunter’s		33.47	0.00–91.00	23.50	0.78	13.97	2.09
	Hunter’s		33.21	0.00–130.08	24.72	0.74	13.09	2.24
	Hunter’s ()^2		32.39	7.29–137.96	26.52	0.82	12.34	2.37
	Multivariate		32.38	0.13–122.80	29.28	0.85	11.24	2.60
Set	Parameters	Sample number	Mean	Range	SD	r	RMSEP	RPD
Prediction	Reference α-solanine	480	28.74	9.58–61.37	10.38	—	—	—
	Hunter’s		39.18	12.32–63.84	11.15	0.74	11.93	0.87
	Hunter’s		39.58	10.75–78.97	12.99	0.62	13.54	0.77
	Hunter’s ()^2		33.60	10.22–93.77	15.54	0.62	10.98	0.95
	Multivariate		33.92	7.61–80.82	14.40	0.76	9.09	1.14

SD: standard deviation; RMSEC: root mean square error of calibration; RMSEP: root mean square error of prediction; RPD: residual predictive deviation; R²: coefficient of determination in calibration; and r: coefficient of correlation in prediction data set.