12552
The stability of the extracted phycocyanin was also confirmed by comparing its DPPH ( alpha , alpha - diphenyl - beta - picrylhydrazyl ) scavenging activity , showing 83 % removal of oxygen free radicals .
 Chemical: DPPH; Chemical: alpha , alpha - diphenyl - beta - picrylhydrazyl; Chemical: oxygen
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: DPPH, alpha , alpha - diphenyl - beta - picrylhydrazyl, oxygen 
Answer:
 Chemical: DPPH; Chemical: alpha , alpha - diphenyl - beta - picrylhydrazyl; Chemical: oxygen