AOAC SPDS Meeting Book March 19 2015

Existing Methods‐Compendium  • USP‐ Powdered Decaffeinated Green Tea Extract ‐2014 • ISO 14502 Determination of substances characteristic of  green and black tea‐2005 – Part 1: Content of total polyphenols in tea —Colorimetric method using  Folin‐Ciocalteu reagent – Part 2: Content of catechins in green tea —Method using high‐ performance liquid chromatography • GB/T8312 (China) Tea‐Determination of caffeine content‐2002

Fitness for Purpose (proposal)

The method must be suitable for analysis of tea catechins, caffeine and theaflavins in tea leaf, tea extract, powdered tea extract, liquid tea and tea extract in other herbal blend matrices.