Application of DRIFT-FTIR spectroscopy for quantitative prediction of simple sugars in two local and two Floridian mango (Mangifera indica L.) cultivars in Kenya

Journal of Analytical Science and Technology

Table 2 Calibration and cross-validation statistics for sugars on freeze-dried mango samples

Sugars (N)	Pre-treatments	Wavelength (cm⁻¹)	R ²	SECV	RPD	F	Bias	PRESS
Fructose (67)	1stDer	4000–500	0.70	0.28	12.73	3	−0.53	0.0048
Glucose (38)	1stDer	750–1500	0.80	0.55	11.52	3	−0.34	0.0155
Sucrose (34)	1stDer	4000–500	0.64	7.24	0.18	8	−0.81	0.0499
Maltose (41)	1stDer	750–1500	0.37	0.39	2.03	3	−1.15	0.0944

F PLS factors/number of partial least squares factors used in calibration equation, R ² = coefficient of determination, SEC standard error of cross-validation; Bias difference between mean of the MIR-predicted values and the mean of the reference method values, N number of samples, RPD (std. dev. of reference data)/(std. error of cross-validation), PRESS predictive residual sum of squares