紫草天然染料提取工艺优化

Optimization of Extraction Process of Natural Dye from Arnebiae Euchroma(Royle) Johnst

通过单因素试验和正交试验对紫草天然染料的无水乙醇提取工艺进行了研究。单因素分析结果为浴比1∶20,提取温度60℃,提取时间2h;正交优化工艺为浴比1∶10,提取温度60℃,提取时间90min。同时研究了pH值和存放时间对所提取紫草天然染料的影响,结果表明,紫草天然染料对酸碱比较敏感;染液贮存48h后,紫草染料性质基本保持不变。

The optimization of the extractton proce and orthogonal test with anhydrous ethanol was studied. The optimal result of signal factor test was as follows., the extraction was carried out in the bath ratio of 1 ： 20 at 60 ℃ for 2 h. The optimal result of the orthogonal test was as follows： the extraction was car- ried out in the bath ratio of 1 ： 10 at 60 ℃ for 1.5 h. The effect of pH and storing time on the stability of dye were studied. The re- sults showed that the colour of the dye could be significantly affected by acids and bases, and after storage for 48 h, the properties of dye were basically unchanged.