Abstract:

The optimal ultrasonic-surfactant extraction of dioscin from Dioscorea zingiberensis C. H. Wright was studied. The effects of ultrasonic frequency, ultrasonic treatment time, material/liquid ratio and surfactant concentration on the extraction rate of dioscin were explored through single factor and orthogonal array experiments. The optimal conditions for the extraction of dioscin were determined as follows: material/liquid ratio, 1:14; surfactant concentration, 8.6×10-3 mol/L; ultrasonic frequency, 25.8 kHz; and ultrasonic treatment time, 40 min. The extraction rate of dioscin reached up to 6.50% under the optimal extraction conditions, which was higher than that of 3.33% using water extraction. This extraction method is characteristics of high yield, time-saving, energy-saving and pollution-free advantages.

Key words: ultrasonic, surfactant, Dioscorea zingiberensis C.H wright dioscin, extraction