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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

From: HPLC-CUPRAC post-column derivatization method for the determination of antioxidants: a performance comparison between porous silica and core-shell column packing

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%)