采用 H2O2/TAED/NaHCO3 体系对白藜芦醇进行脱色处理。
Removing polysaccharides-and saccharides-related coloring impurities in alkyl polyglycosides by bleaching with the H2O2/TAED/NaHCO3 system.
机构信息
Department of Process Equipment and Control Engineering, Hebei University of Technology, Tianjin 300130, China; Research Center of Engineering Fluid and Process Enhancement, Hebei University of Technology, Tianjin 300130, China.
Department of Process Equipment and Control Engineering, Hebei University of Technology, Tianjin 300130, China; Research Center of Engineering Fluid and Process Enhancement, Hebei University of Technology, Tianjin 300130, China.
出版信息
Carbohydr Polym. 2014 Nov 4;112:416-21. doi: 10.1016/j.carbpol.2014.05.065. Epub 2014 Jun 12.
The effect of H2O2/TAED/NaHCO3 system, namely NaHCO3 as alkaline agent with the (tetra acetyl ethylene diamine (TAED)) TAED-activated peroxide system, bleaching of alkyl polyglycosides solution was studied by spectrophotometry. The results showed that the optimal bleaching conditions about H2O2/TAED/NaHCO3 system bleaching of alkyl polyglycosides solution were as follows: molar ratio of TAED to H2O2 was 0.06, addition of H2O2 was 8.6%, addition of NaHCO3 was 3.2%, bleaching temperature of 50-65 °C, addition of MgO was 0.13%, and bleaching time was 8h. If too much amount of NaHCO3 was added to the system and maintained alkaline pH, the bleaching effect would be greatly reduced. Fixing molar ratio of TAED to H2O2 and increasing the amount of H2O2 were beneficial to improve the whiteness of alkyl polyglycosides, but adding too much amount of H2O2 would reduce the transparency. In the TAED-activated peroxide system, NaHCO3 as alkaline agent and buffer agent, could overcome the disadvantage of producing black precipitates when NaOH as alkaline agent.
通过分光光度法研究了 H2O2/TAED/NaHCO3 体系（即 NaHCO3 作为碱性试剂与（四乙酰乙二胺（TAED））TAED 活化过氧化物体系）对烷基多糖苷溶液的漂白效果。结果表明，H2O2/TAED/NaHCO3 体系漂白烷基多糖苷溶液的最佳漂白条件为：TAED 与 H2O2 的摩尔比为 0.06，H2O2 的添加量为 8.6%，NaHCO3 的添加量为 3.2%，漂白温度为 50-65°C，MgO 的添加量为 0.13%，漂白时间为 8h。如果向体系中加入过多的 NaHCO3 并保持碱性 pH，漂白效果会大大降低。固定 TAED 与 H2O2 的摩尔比并增加 H2O2 的用量有利于提高烷基多糖苷的白度，但添加过多的 H2O2 会降低透明度。在 TAED 活化过氧化物体系中，NaHCO3 作为碱性试剂和缓冲试剂，可以克服使用 NaOH 作为碱性试剂时产生黑色沉淀物的缺点。
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