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
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: 1 , 1 - diphenyl - 2 - picrylhydrazyl; Chemical: DPPH; Chemical: nitroblue tetrazolium; Chemical: NBT; Chemical: superoxide