本文综述了从植物中提取果胶的各种方法，包括化学提取法和生物提取法。
In this paper, the methods of pectin extraction and purification from plant tissues, including chemical and biological methods, are introduced.
目前，评价土壤中金属植物有效性的方法主要有：化学提取法、植物吸收试验、微生物和酶活性试验及同位素法。
The main methods now to evaluate Pb availability in soil are chemical extraction, plant adsorption, microbial and enzyme activation and isotopes tests.
采用同时蒸馏萃取法提取白鲜皮中的挥发油，通过GC-MS对其化学成分进行分析。
The volatile oil from Dictamnus dasycarpus Turcz was extracted by simultaneous distillation and extraction(SED), then separated and analyzed by GC-MS.
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