Fig. 1. DA7250 diode array nalyzer

Fig. 2. Samples of peanut seed coats with different colors
(a): Black purple peanut kernels; (b): Red peanut kernels; (c): Pink peanut kernels

Fig. 3. Scanning spectrum of black-purple samples

Fig. 4. Scanning spectrum of red samples

Fig. 5. Scanning spectrum of pink samples

Fig. 6. Correction model and prediction model of peanut seed sugar content in different seed coat colors
(A), (a): Black-purple coat, sucrose content; (B), (b): Black-purple coat, solublesugar content; (C), (c): Black-purple coat, total sugar content; (D), (d): Red coat, sucrose content; (E), (e): Red coat, solublesugar content; (F), (f): Red coat, total sugar content; (G), (g): Pink Color coat, sucrose content; (H), (h): Pink coat, soluble sugar content; (I), (i): Pink coat, total sugar content

Table 1. Statistical analysis of chromaticity values of different seed coat colors

Table 2. Chemical determination results of sugar content in peanut seeds with different coat color

Table 3. Optimal pretreatment method and prediction model of spectral value of praline content of peanut seed in different seed colors