Optimization on Preparation of a Lactulose Syrup by Lactose Isomerization

Firstly,the agent that isomerized lactose to lactulose was selected,the best isomerizing agent was disodium hydrogen phosphite,secondly,the isomerization conditions were optimized,the best isomerization conditions were as follows: the quantity of isomerization agent was 2.0 %,the reaction time was 3 h,the temperature of reaction was 110 ℃,the concentration of lactose was 70 %,in the above conditions,the content of lactulose in reaction mixture reached 56.84 %.