8982
The antioxidant activity was evaluated by DPPH , ABTS , beta - carotene bleaching test and Fe - chelating activity assay .
 Chemical: DPPH; Chemical: ABTS; Chemical: beta - carotene; Chemical: Fe
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: DPPH; Chemical: ABTS; Chemical: beta - carotene; Chemical: Fe