气升式反应器超声破碎海带提取硫酸酯多糖

在内径8cm、有效容积为1L的气升式循环超声破碎浸提装置中，进行了超声波强化海带硫酸酯的多浸提实验。在pH5．0、提取温度40℃、液固比45、提取时间25min、通气量75L/h、超声功率120W、超怕作用时间百分比为100％的工艺条件下，硫酸酯多糖的提取率可达1．86％，比传统水提法高，且大地缩短了提取时间，比相同条件下不用超声时的提取率（1．11％）高得多。此法所得多糖的SO4^2－含量（26．5％）比水法浸提（20．8％）和相同条件下不用超声时（21．3％）都要高，显示出超声波在强化海带硫酸酯多糖浸提方面的良好应用前景。

Extraction of Sulfate Radical Polysaccharide from Laminaria Japonica Enhanced by Ultrasonic Wave in an Air-lift Reactor

The extraction of sulfate radical polysaccharide from Laminaria Japonica enhanced by ultrasonic wave in an air-lift reactor was reported. The optimal experimental conditions in this reactor (diameter 8 cm, working volume 1 liter) were pH 5.0, operation temperature 40oC, mass ratio of liquid to solid 45, extraction time 25 min, air flow rate 75 L/h, ultrasonic power 120 W, ultrasonic duty cycle 100%. Under the above conditions, the extraction ratio of sulfate radical polysaccharide reached 1.86%, higher than that by treatment for 3 h in water at 100oC and that under the same conditions without ultrasonic wave applied. The content of SO42( in sulfate radical polysaccharide of the former was 5.7% higher due to application of ultrasonic wave. The experimental results showed that this novel extraction process is prospective in the extraction of polysaccharide from seaweed.