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植物样品的前处理,大都操作繁杂,费时费工,且耗能高。该试验利用微波的高渗透性和快速加热性能,以1mol/L盐酸作为提取溶剂,采用微波消解技术,对番薯样品中的钙进行快速提取。以20%的氯化锶作硅、磷等干扰离子的掩蔽剂,用原子吸收分光光度法对所提取钙的含量进行了测定。以番薯样品中钙的含量为考察指标,讨论提取料液比、微波功率、提取时间等因素对钙提取效果的影响。通过正交试验,确定微波提取番薯中钙的最佳工艺条件:料液比1∶70,提取功率440W,提取时间5min。与传统直接盐酸提取法对照,测定结果没有显著性差异。试验结果表明,该法具有操作简便、快速、不污染环境、提取效果好、便于推广普及等优点。
Pretreatment of plant samples, most of the complicated operation, time-consuming and labor-intensive, and high energy consumption. The experiment uses the microwave permeability and rapid heating performance, with 1mol / L hydrochloric acid as the extraction solvent, using microwave digestion technology, rapid extraction of calcium in sweet potato samples. With 20% of strontium chloride as silicon, phosphorus and other interference ions masking agent, atomic absorption spectrophotometry of the extracted calcium content were determined. The content of calcium in the sweet potato sample was taken as the index of investigation, and the effects of extraction ratio of the solid to liquid, microwave power and extraction time on the calcium extraction were discussed. Through orthogonal test, the optimum technological conditions of microwave extraction of calcium in sweet potato were determined: the ratio of solid to liquid was 1:70, the extraction power was 440W and the extraction time was 5min. Compared with the traditional direct hydrochloric acid extraction method, there is no significant difference between the determination results. The test results show that the method has the advantages of easy operation, fast, non-polluting environment, good extraction effect, easy popularization and popularization.