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In the batch system , the optimal concentration of fructose for lactulose synthesis was 20 % , and the effect of galactose , glucose and fructose on beta - galactosidase activity was determined for hydrolysis of whey lactose and the transgalactosylation reaction for lactulose synthesis .
 Chemical: fructose; Chemical: lactulose; Chemical: galactose; Chemical: glucose; Chemical: fructose; Chemical: lactose; Chemical: lactulose
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: fructose; Chemical: lactulose; Chemical: galactose; Chemical: glucose; Chemical: fructose; Chemical: lactose; Chemical: lactulose