地黄中水苏糖的分离与脱色

用超滤法和吸附法对地黄水苏糖提取液进行了初步分离和脱色。考察了微滤预处理、操作压力、温度及体积浓缩比对膜通量的影响,确定的最佳超滤工艺为:压力0.10 MPa,温度50℃,体积浓缩比8。应用该工艺可使w(水苏糖)由28.3%提高到40.5%,对溶液的脱色率达72.4%。将超滤透过液分别用活性炭、A l2O3和5种离子交换树脂进一步脱色,活性炭的脱色效果最佳,进而考察了活性炭用量、温度、脱色时间及pH对脱色率的影响。确定的最佳脱色条件为:温度50℃,活性炭0.3 g/L,脱色时间2.5 h,pH 4.0。在该条件下,脱色率可达99.1%。

Separation and Decoloration of Stachyose from Radix Rehmanniae Libosch

Separation and decoloration of stachyose derived from Radix Rehmanniae extract was carried out by use of ultrafiltration and adsorption technology.The optimum conditions were pressure 0.10 MPa,temperature 50 ℃ and volume concentration rate 8.The mass fraction of stachyose in the extract increased from 28.3% to 40.5%,the decoloration ratio achieved 72.4%.The solution permeated through the membrane was further decolored by activated carbon,aluminium oxide and five kinds of ion exchange resins,respectively.The results showed that activated carbon possessed the highest decoloration capacity.When temperature was kept at 50 ℃ and pH at 4.0,content of activated carbon was 0.3 g/L,and decoloration time was 2.5 h,the decoloration ratio reached 99.1%.