Abstract:

The cyanidin-3-glucoside content and color value of red kernel color (RKC) were detected by HPLC method
and UV spectrophotometry, respectively. The correlation between both parameters was analyzed by linear regression. The
results showed that the two parameters were positively correlated, and cyanidin-3-glucoside content and color value were
slightly higher in powder samples than in liquid ones. For liquid samples, color value of 1 referred to (91.40 ± 0.15) mg of
cyanidin-3-glucoside in 100 mL of samples, with the variation coefficient of 3.17% and the correlation coefficient of 0.9983.
For powder samples, color value of 1 represented (102.10 ± 0.21) mg of cyanidin-3-glucoside in 100 g of samples, with the
variation coefficient of 0.38% and the correlation coefficient of 0.9953. Good linearity indicated that the content of cyanidin-
3-glucoside in RKC could be simply calculated through determining its color value, thereby providing a theoretical basis for
quality control of RKC in small and medium enterprises.

Key words: red kernel color, cyanidin-3-glucoside, color value, linear regression, correlation