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

Table 2

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

Set	Parameters	Sample number	Mean	Range	SD	R^2	RMSEC	RPD
Calibration	Reference α-chaconine	960	18.69	0.93–59.36	15.60	—	—	—
	Hunter’s		18.98	0.00–48.74	12.43	0.69	8.42	1.85
	Hunter’s		18.87	0.00–68.32	12.88	0.71	8.25	1.89
	Hunter’s ()^2		18.68	6.04–71.86	13.36	0.74	7.98	1.95
	Multivariate		18.70	1.68–65.30	13.77	0.78	7.34	2.12
Set	Parameters	Sample number	Mean	Range	SD	r	RMSEP	RPD
Prediction	Reference α-chaconine	480	14.85	8.32–25.69	4.25	—	—	—
	Hunter’s		22.17	8.40–34.82	5.72	0.70	8.00	0.53
	Hunter’s		22.34	7.70–42.36	6.60	0.58	8.66	0.49
	Hunter’s ()^2		19.29	7.52–49.60	7.83	0.57	6.98	0.61
	Multivariate		19.43	5.39–42.32	4.46	0.71	6.30	0.67