21941
The rate of chemical degradation of citral in acidic aqueous solutions was found to be highest , which was subsequently reduced significantly within these studied surfactant systems , suggesting protection of citral from an acidic environment once it is incorporated into the micelles .
 Chemical: citral; Chemical: citral
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: citral, citral 
Answer:
 Chemical: citral; Chemical: citral