Optimization of the ultrasonically assisted extraction of polysaccharides from Zizyphus jujuba cv. yuanlingdazao

Polysaccharides were extracted from Zizyphus jujuba cv. yuanlingdazao. A novel ultrasonic extraction technology was applied to the polysaccharides extraction. The main effect of ultrasonic power and ultrasonic time was significant. The results indicated that the order of the influence of the four factors on the yield of polysaccharides was ultrasonic power,extraction time,extraction temperature and the liquid-solid ratio. The interaction between ultrasonic power and extraction temperature was not significant. The interaction between other factors on the influence of the polysaccharide extraction yield was significant. The optimal extraction conditions were ultrasonic power of 360W,extraction time of 40min,extraction temperature of 55℃ and liquid-solid ratio of 12∶ 1. Under these conditions,the experimental yield of polysaccharides was 4. 93%.