[Optimation the extracting technology of Angelica sinensis by central composite design and response surface...

To optimize the extracting technology from Angelica sinensis by central composite design-response surface methodology.

On the basis of the single factor,independent variables were ethanol concentrations, solvent ratio and ultrasonic time, while dependent variable was the OD value of extraction rates of ferulic acid and liqustilide. A two-order polynomial equation was fitted to estimate the relationship between independent and dependent variables. Response surface method was used to optimize the extracting process.

The optimum extraction conditions for Angelica sinesis were obtained as follows: the extracting solvent was methanol concentrations of 70%, 30 fold solvent, extracting for once and for 40 minutes. The deviation between observed and predicted values was 1.23%.

The result indicates that the central composite design and response surface methodology is simple, convenient and reliable for optimizing the extraction process of Angelica sinesis with higher precision.