小麦麸皮中木聚糖提取条件的优化

Optimization of Xylans Extraction from Wheat Bran

以小麦麸皮为原料,先后采用碱液提取法和乙醇沉淀法对小麦麸皮中的木聚糖进行提取,并对提取条件进行优化。得到最佳碱提条件为麸皮与碱液的料液比1∶20,碱液(Na OH)质量分数12%,在75℃条件下提取2.5 h;最佳醇沉条件为95%乙醇与碱提液体积比2∶1,p H值5的条件下,醇沉1.0 h。

In this paper, xylans are extracted through alkali extraction and alcohol precipitation in succession from wheat brans which regarded as raw materials and the extraction condition is also optimized. The optimum conditions of alkali extraction are gained as followed 1 ： 20 of material-liquid ratio, 12% of NaOH concentration, 75 ℃ of temperature, 2.5 hours of extracting time; the optimum conditions of ethanol precipitation are also gained as followed： 95% ethanol and alkali volame ration is 2 ： 1 volume, 5 of pH, 1.0 hour of precipitating time.