Abstract:

The ultrasonic-assisted extraction of ginseng starch was optimized using single-factor and orthogonal array
designs. The extraction yield of ginseng starch was investigated with respect to ultrasonic power, ultrasonication time, ratio
of material to liquid and material particle size. The particle and physicochemical properties of ginseng starch were studied
by using scanning electron microscope, polarizing microscope, infrared spectrometer, Brabender viscograph and texture
analyzer. The results showed that the optimal conditions for ultrasonic-assisted extraction of ginseng starch were found to be
ultrasonic power 600 W, ultrasonic time 20 min, ratio of material to liquid 1:25 (g/mL) and material particle size 80 mesh.
The extraction yield of ginseng starch under the optimized conditions was up to 70.51%, which was 10.69% higher than that
obtained with the conventional method. Ginseng starch from the ultrasonic-assisted extraction exhibited increased levels of
amylose content, solubility, swelling power and transparency and reduced retrogradation property, and had a gelatinization
temperature of 70.5 ℃ and a peak viscosity of 70.0 BU.

Key words: ginseng starch, ultrasonic, extraction, properties