... 70%, 80%, 90%, 95%, 98% UV 2. Catechins 10%, 15%, 20%, 25%, 30%, 40%, 50%, 60%, 65%, 70%, ... 75%, 80%, 90% HPLC 3. EGCG 10%, 15%, 20%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, ... example, Polyphenols 95%+Catechins 70%+EGCG 40%+Caffeine 5% Specification Sheet Product Name:Green Tea Extract PowderUsed ... 2ppmAssayPolyphenols by UV> 95.0%Catechins by HPLC> 70.0%EGCG by HPLC> 40.0%Caffeine by HPLC< 5.0%Total ...