Abstract:
The optimization and kinetic analysis of ultrasound-assisted extraction of polysaccharides from
Panax notoginseng residue was studied in this paper. On the basis of single factor experiment, the result was optimized by Box-Behnken Response Surface Methodology, which was as follows: ultrasound temperature 60 ℃, ultrasound power 136.8 W, ultrasound time 53 min, liquid-solid ratio 43 mL/g. Under those conditions, the yield of polysaccharide was 6.79%. While the predicted yield was 6.88% and the relative standard deviation (RSD) was 1.31%. In comparison with the same conditions of hot water extraction, the yield was increased by more than 55% by the optimization. In this paper, the kinetic model of ultrasound-assisted extraction of polysaccharides from
Panax notoginseng residue was built. The rate constant and relative extraction residual rate of polysaccharides was calculated by measuring the concentration of polysaccharides in the extraction solution at different ultrasound powers and different ultrasound times. According to those two parameters, the half-life regression equation and the effective diffusion coefficient regression equation were fitted. The experimental results showed that the rate constant increased with the increasing of ultrasonic power. The enhancement of ultrasonic power was beneficial to the faster dissolution of polysaccharides from
Panax notoginseng residue.