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Effect of theasinensin A addition on the bitterness of tea soups. TSA was added to black tea (A), oolong tea (B), and green tea (C) to study the effect on the bitterness of tea soup. [Nore: 200 μmol/L, 1,000 μmol/L, and 2,000 μmol/L of TSA concentrations correspond to 1, 5, and 10 of bitterness sensory intensity score of TSA respectively. a, b, cDifferent letters in the same column indicate significant differences between mean values (p < 0.05)].
