采用氢氧化钾改性剂脱除魔芋中乙酰基团

采用分子修饰的机械力化学改性方法从魔芋葡甘聚糖中脱除乙酰基团有利于提高其膜性能。该文采用氢氧化钾作为改性剂，利用高能量密度的振动磨对魔芋葡甘聚糖的乙酰基团进行有效脱除的机械力化学改性研究试验。试验结果表明：机械力化学的方法可以有效地降低魔芋葡甘聚糖的乙酰度。经过30 min的机械力化学改性处理，魔芋葡甘聚糖中乙酰基团的脱除率可达到了90%，其受热时的质量损失率减小，水溶胶的溶胀速率和稳定性均得到了提高。

Acetyls removal from konjac glucomannan with potassium hydroxide

The removal of acetyls from konjac glucomannan (KGM) can modify the molecular structure via a molecular modification method by mechano-chemical treatment to increase the film performance of the KGM in engineering. The de-acetylation from the KGM was performed with potassium hydroxide (KOH) as a modifier through a mechano-chemical treatment in a high energy intensive vibrating mill. The results showed that the mechano-chemical treatment was an effective modification method to remove the acetyls from the KGM. The removal rate of acetyls from the KGM sample could be 90 % when the KGM sample was treated by this effective mechano-chemical method for 30 min. The mass loss of de-acetylated KGM sample was lower than that of original sample. The de-acetylated KGM samples possessed a better swelling rate and a stability in water.