A Study on Correlation and Regression Analysis of Anthocyanin Contents and Color Indices in Chinese Cabbage

To find a fast method for determining anthocyanin content in Chinese cabbage [Brassica campestris L.ssp.pekinensis(Lour) Olsson],anthocyanin contents and color indices of 3 different colored Chinese cabbage cultivars were measured by the pH method and a colorimeter,respectively.Correlation and regression analysis between the color parameters and contents of anthocyanin was conducted.The results showed that the 6 color indices including L,a,b,C,h,and H could effectively reflect minor changes of leaf color;no anthocyanin was detected in cvs.'Cheng yang qing' and 'Qiu bao huang'.High contents of anthocyanin were detected in the 1-4th leaf layer from outside to inside of the purple Chinese cabbage cv.'Cai feng'.Significant correlations were found between the color indices(L,b,h,C) and contents of anthocyanin with correlation coefficients of-0.85**,-0.58**,-0.49*,and-0.58**,respectively.Correlation coefficient of the regression equations was 0.9629.The regression equation obtained was as following: y=90.24-1.07x1+5.65x2-142.71x3(where x1 was the L value;x2 was the a value;x3 was the h value;y was anthocyanin content).Anthocyanin content in Chinese cabbage can be quickly determined by using a colorimeter and the regression equation.