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Encapsulation of food grade antioxidant in natural biopolymer by electrospinning technique : a physicochemical study based on zein - gallic acid system .
 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: gallic acid