1212
On the other hand , fluorescence and CD spectra reflected that the ultrasound irradiation had increased the number of tryptophan on dextranase surface with increased alpha - helix by 15 . 74 % and reduced random coil by 5 . 41 % upon ultrasound - treated dextranase protein compared to the control , which were helpful for the improvement of its activity .
 Chemical: tryptophan
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: tryptophan 
Answer:
 Chemical: tryptophan