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以石油醚为提取剂 ,杜仲叶和皮经过硫酸或氢氧化钠水溶液处理后 ,能提高杜仲胶的提取率。但硫酸浓度太高会导致杜仲胶降解 ,而用碱处理不会发生此现象。提取液经蒸馏适量回收溶剂后 ,再以乙醇为沉淀剂 ,丙酮为脱色剂制得白色富有弹性的杜仲精胶。
Using petroleum ether as an extracting agent, Eucommia leaves and skin can be treated with sulfuric acid or sodium hydroxide solution to increase the extraction rate of gutta percha. However, if the sulfuric acid concentration is too high, eucommia gum will degrade, but this will not happen with alkali treatment. After the extract was distilled to recover the solvent, ethanol was used as a precipitant and acetone was used as a decolorizer to obtain a white elastic Eucommia ulmoides.