19607
To evaluate their anti - oxidative activities , 1 , 1 - diphenyl - 2 - picrylhydrazyl ( DPPH ) / free radical scavenging activity and nitroblue tetrazolium ( NBT ) / superoxide anion scavenging activity were determined .
 Chemical: 1 , 1 - diphenyl - 2 - picrylhydrazyl; Chemical: DPPH; Chemical: nitroblue tetrazolium; Chemical: NBT; Chemical: superoxide
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: 1 , 1 - diphenyl - 2 - picrylhydrazyl, DPPH, nitroblue tetrazolium, NBT, superoxide 
Answer:
 Chemical: 1 , 1 - diphenyl - 2 - picrylhydrazyl; Chemical: DPPH; Chemical: nitroblue tetrazolium; Chemical: NBT; Chemical: superoxide