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