OBJECTIVE To explore the optimal parameters of simmered Rhei Radix et Rhizoma and the correlation between the chroma values and the intrinsic composition of simmered Rhei Radix et Rhizoma decoction pieces powder.
METHODS The single-factor-response surface method was used to investigate the simmering temperature, simmering time, paper dosage and plant ash dosage, the response surface experiment was carried out on the basis of the single factor experiment, the appearance traits, total anthraquinones, free anthraquinones, leachables, sennoside A and B contents were taken as indicators, the analytic hierarchy process (AHP) was used to give weights to each index, and the process was optimized. The chroma values of raw and simmered products were determined by electronic eye, the correlation and regression analysis were carried out by SPSS22.0 software, and the chroma-component regression equation was constructed.
RESULTS The optimal process of simmering Rhei Radix et Rhizoma was 140 ℃, 5 times of plant ash, 2 layers of wet paper wrapped and being simmered for 2.5 h.
CONCLUSION The simmering process of Rhei Radix et Rhizoma optimized by AHP combined with response surface method is reasonable and feasible, the color of decoction pieces has a significant correlation with the component content, and the regression equation constructed is reliable, which can predict the intrinsic component content of decoction pieces through chroma values.
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