文中对50℃烘干的中华苦荬菜多酚进行了超声提取工艺的研究,采用响应面法优化了乙醇浓度(A)、超声时间(B)和料液比(C)3个因素,分析并建立数学模型。结果表明:乙醇浓度对中华苦荬菜多酚得率有极显著影响(P<0.01),料液比具有显著影响(P<0.05)。在乙醇体积分数为60%,超声时间60 min,料液比为1∶20(g∶mL)条件下,多酚得率可达1.84%。在最佳提取条件下分别对真空冷冻干燥、红外干燥、自然阴干、烘干及自然晒干的中华苦荬菜进行提取并测定,试验结果表明:真空冷冻干燥的中华苦荬菜多酚得率高,为3.22%,自然晒干的中华苦荬菜多酚得率低,为1.23%,干燥效果依次为冻干>红外干燥>烘干>阴干>晒干。所得回归方程为Y=1.87+0.18A+0.056B+0.071C+0.067AB-0.013AC+0.030BC-0.36A2-0.057B2-0.18C2。

This paper studied ultrasonic extraction of polyphenols from Ixeris Chinensis under 50 ℃ drying. The response surface methodology was used to establish a models for Alcohol concentration( A),Processing time( B) and Material-liquid ratio( C). Results showed that alcohol concentration( P < 0. 01) and material-liquid ratio( P < 0. 05)had significant affects on extraction rate. The optimum extraction condition was: the ethanol concentration 60%,ratio of solid to liquid was 1: 20,uUltrasonic extraction for 60 minutes. Under the above conditions,the highest rate was1.84%. Under the optimum extraction conditions,the vacuum freeze drying,infrared drying,natural shade drying and natural drying were compared. The results showed that the vacuum freeze-drying has the highest yield of 3. 22%. The sun drying yield was the lowest of 1. 22%. The drying effect order were freeze drying > infrared drying > natural shade drying > sun drying. The regression equation was Y = 1. 87 + 0. 18A + 0. 056B + 0. 071C + 0. 067AB-0. 013AC + 0. 030BC- 0. 36A2- 0. 057B2- 0. 18C2.