Correlation Analysis between Color Difference and Sensory Quality of Dracocephalum rupestre Hance Tea Soup
Objective:To establish a reliable,accurate,and objective method for evaluating the quality of Dracocephalum rupestre Hance tea(DRH)through statistical analysis.Methods:The correlation and linear regression relationship between the color difference value,absorbance value,water extract content of DRH samples,and sensory evaluation scores of tea soup were determined and analyzed.Results:There is a significant positive correlation between the sensory evaluation score of DRH and the L value of lightness and darkness.There is a significant negative correlation between the value of the red-greenness indicator a and the yellow-blueness indicator b value.And there is a significant positive correlation between the color difference derivative value Cab and color difference Δ E.Therefore,it can be used to reflect the quali-ty of DRH that the color difference parameters L,a,b,Cab,and ΔE.There was a linear relationship between the total score of sensory evaluation(Y1)and brightness L(X1),chroma a(X2),and chroma b(X3).The established prediction equation was Y1=24.93+6.78X1-66.55X2-21.35X3(P＜0.05,R2=0.62).There was a very significant positive correlation be-tween the absorbance value of DRH soup and various sensory scoring items.There was a linear relationship between the absorbance value(Y2)and appearance(X1),aroma(X2),soup color(X3),taste(X4),leaf bottom(X5),and the total score(X6).The linear equation was Y2=-0.008-5.43×10-5X1+7.33×10-5X2+0.001X3+0.001X5-0.001X6(P＜0.01,R2=0.96).There was a very significant positive correlation between the content of DRH extract and various sensory scoring items.Water extract content(Y3),appearance(X1),aroma(X2),soup color(X3),taste(X4),leaf bottom(X5),and the to-tal score(X6)were selected.The established prediction equation was Y3=-0.036+6.21 × 10-5X1+0.002X2+0.005X3-4.61 × 105X4-0.003X5+0.001X6(P＜0.05,R2=0.87).Conclusion:This study established an evaluation method for the quality of Mao-jian tea,which provided the reference for the production and processing of herbal tea.
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