【摘要】 D—木糖醇和L—阿拉伯糖醇都是戊糖醇,二者分子构型仅是C₄上羟基在空间排列位置不同。用H⁺型阳离子交换树脂不能使二者有效分离。但是二者与La³⁺型阳离子交换树脂络合能力不同;用水淋洗,可以有效地分离。采用该法分离出工业木糖醇中不宜食用和药用的L—阿拉伯糖醇,得到了纯度为99.8％,收率达70.04％的木糖醇。更多还原

【Abstract】 The paper describs a separation of xylitol and L-arabitol on a cation-exchange resin in the La3+ form using water elution.Complexing of xylitol and L-arabitol with La3+occurs at three oxygen atoms positioned 02,03,04 which located at the ax-eq-ax sites. The energy required to form this arrangement will vary with the configuration of xylitol and L-arabitol. The configuration of xylitol is more favourable for complexation with La3+than that of L-arabitol,hence by the use of column cation-exchange resin containing Lanthanum ions two alditols can be separated from each other.By this method,industrial xylitol can be separation from L-arabitol and the product of the xylltol crystal of 99. 8% purity is obtained with a yield of 70. 04%.更多还原