摘要
[Objective] This study was conducted to obtain the optimal process for the preparation of biological humic acids （BHAs） from fermented furfural residue by al- kali-dissolution and acidification. [Method] BHAs were extracted from fermented furfural residue by the alkali-dissolution and acidification method, to investigate the effects of solid-liquid ratio （mass ratio of fermented furfural residue to water）, alkali concentration, extraction temperature and extraction time on the extraction rate of BHAs by an orthogonal experiment, and then a solid BHA product was obtained by acidification of its extract followed by solid-liquid separation and oven-drying. [Result] The results showed that the optimal extracting conditions were as follows： solid-liquid ratio of 1：8, alkali concentration of 8% KOH, with extracting temperature at 70℃ and extracting time of 2.5 h in the alkali-dissolution step, and in the acidification step, the pH of the BHA mixture was 2.5. Under the optimal conditions, the content of solid BHAs was 76%, and the extraction rate of BHAs was 49%. [Conclusion] This study provides a theoretical basis for the separation and purification of BHAs from fermented furfural residue by the alkali dissolution and acidification method.
[目的]获得从腐熟糠醛渣中利用碱提酸析方法制备生化腐植酸的最优工艺。[方法]以发酵糠醛渣为原料,采用碱提酸析法提取生化腐植酸(BHAs)。通过四因素四水平的正交实验,考察固液比(发酵糠醛渣与水的质量比)、碱液浓度、提取温度、提取时间对生化腐植酸提取率的影响,再利用盐酸调节提取液的p H值,使生化腐植酸沉淀析出,固液分离烘干后得到成品生化腐植酸。[结果]最佳的腐植酸提取工艺条件为:碱提步骤固液比为1:8、碱液浓度为8%、提取时间为2.5 h、提取温度为70℃,酸析步骤p H为2.5。得到腐植酸含量为76%的固体生化腐植酸成品,其提取率为49%。[结论]该研究为碱提酸析法从发酵糠醛渣中分离提纯BHA提供了理论依据。
