正交试验结果表明：超声波预处理时间是影响褐菇多糖提取量的主要因素；
The results of orthogonal experiment showed that ultrasonic pretreatment time was the main factor that affected the extraction of polysaccharide in portabella.
采用空气氧化预处理、硝酸氧化预处理、超声波预处理三种方法提高腐殖酸的提取率。
Three pretreatments including air oxidation pretreatment, nitric acid oxidation pretreatment, ultrasonic pretreatment are used to increase the rate of humic acid extraction.
在酶法制备微孔淀粉的基础上进行了原淀粉的预处理工作，包括原淀粉的预糊化和超声波预处理。
The pretreatments were the pregelatinization of the raw starch and the ultrasonic action based on that the microporous starch was produced by the enzyme act raw starch .
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