20302
Furthermore , the glycerol - containing particles had a significantly lower dissolution rate ( 7 . 8 % +/- 2 . 1 % , over 180min ) compared to the glycerol - free particles ( 58 . 0 % +/- 2 . 9 % , over 60min ) when measured using a Franz diffusion cell .
 Chemical: glycerol; Chemical: glycerol
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: glycerol; Chemical: glycerol