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Lastly , the 1 , 1 ' - diphenyl - 2 - picrylhydrazyl ( DPPH ) assay showed that the gallic acid had retained its antioxidant activity after incorporation in zein electrospun fibres .
 Chemical: 1 , 1 ' - diphenyl - 2 - picrylhydrazyl; Chemical: DPPH; Chemical: gallic acid
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: gallic acid