... tea polyphenols, 50% ; 80% ; 90% ; 95% ; 98% EGCG, 10%-98% catechins, 20-90% ORAC values 19500/gram We ... tea polyphenols, 50% ; 80% ; 90% ; 95% ; 98%EGCG, 10%-98%catechins, 20-90% ORAC values 19500/gramfresh stock ... extractSpec: 50% 60% 70% 80% 90% 95% 98% EGCG: 45% 50% 60% 70%Test method: HPLC UVProduct name: ... catechin ( D, L-C, EGC ) and ester type catechin ( EGCG, GCG, ECG ).Spec: 50% 60% 70% 80% 90% ...