Determination of some selected secondary metabolites and their invitro antioxidant activity in commercially available Ethiopian tea (Camellia sinensis)

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Table 2 Total tannin content of tea brands, the results were expressed in terms of TAE/g the of sample for three independent measurements (triplicate; n = 3, mean ± SD)

Tea brands	TPC ^D₁ mg TAE/g DW	TPC ^E₂ mg/g DW	TTC^F mg TAE/g DW
Green tea	42.1 ± 0.41	34.6 ± 0.67	7.45 ± 0.23^d
Black lion	29.6 ± 0.52	23.2 ± 1.05	6.42 ± 0.53^ab
Eirmon	28.5 ± 0.31	21.8 ± 1.05	6.62 ± 0.77^bc
Gumero	33.3 ± 0.32	26.5 ± 0.52	6.81 ± 0.21^bc
Abyssinia	32.2 ± 1.04	25.5 ± 0.55	6.65 ± 0.84^bc
Dire	29.8 ± 0.31	24.2 ± 0.17	5.64 ± 0.39^a
Addis	29.8 ± 0.66	23.0 ± 0.67	6.90 ± 0.45^bc
Wushwush	31.5 ± 0.72	25.5 ± 0.48	6.0 ± 0.25^ab

Values in the same column that are followed by a different letters (a–d) are significantly different p < 0.05 by Duncan’s multiple range tests
TPC ^D₁ is total polyphenol content expressed in terms of tannic acid equivalent per gram of dry weight before protein precipitation
TPC ^E₂ is total polyphenol content expressed in terms of tannic acid equivalent per gram of dry weight after protein precipitation
TTC^F is total tannin content expressed in terms of tannic acid equivalent per gram of dry weight