Table 3 Antioxidants present per gram of tea samples (extracted in hot water for 20 min) separated in an HPLC with CUPRAC post-column derivatization using phenyl-hexyl core-shell column
Antioxidants | Brand 1 (n = 3) | Brand 2 (n = 3) | Brand 3 (n = 3) | Brand 4 (n = 3) | Brand 5 (n = 3) |
|---|---|---|---|---|---|
Catechin, mg/g | 12.16 ± 0.24 (RSD = 1.97%) | 0.68 ± 0.06 (RSD = 8.82%) | 12.94 ± 0.17 (RSD = 1.31%) | 0.45 ± 0.02 (RSD = 4.44%) | 0.69 ± 0.05 (RSD = 7.25%) |
EGCG, mg/g | 40.71 ± 2.76 (RSD = 6.77%) | 1.30 ± 0.01 (RSD = 0.78%) | 61.57 ± 0.44 (RSD = 0.72%) | 0.62 ± 0.16 (RSD = 25.81%) | 1.09 ± 0.09 (RSD = 9.17%) |