6628
Total polyphenols , catechin profiles and antioxidant activity of tea products from purple leaf coloured tea cultivars .
 Chemical: polyphenols; Chemical: catechin
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: polyphenols, catechin 
Answer:
 Chemical: polyphenols; Chemical: catechin