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. 2023 May 9;10:1138023. doi: 10.3389/fnut.2023.1138023

Table 2.

Dose-over-threshold (DOT) of bitterness substances in black tea, oolong tea, and green tea soups.

Tastant Threshold (μmol/L) Black tea soup Oolong tea soup Green tea soup
Dian Qimen Hainan Dahongpao Anxi Rougui Longjing Maojian Biluochun
TSA 65 2.88 ± 0.09 a 1.47 ± 0.05 b 0.99 ± 0.05 c 0.83 ± 0.00 d 0.08 ± 0.00 e 0.07 ± 0.00 e ND ND ND
C 860 ND ND ND 0.01 ± 0.00 c ND 0.01 ± 0.00 c 0.02 ± 0.00 b 0.02 ± 0.00 b 0.03 ± 0.00 a
EC 930 ND 0.01 ± 0.00 d ND ND 0.01 ± 0.00 d 0.01 ± 0.00 d 0.08 ± 0.00 b 0.09 ± 0.00 a 0.04 ± 0.00 c
EGCG 190 0.06 ± 0.00 f 0.05 ± 0.00 g 0.05 ± 0.00 g 0.23 ± 0.01 c 0.09 ± 0.00 e 0.11 ± 0.00 d 0.64 ± 0.03 b 0.68 ± 0.00 b 1.06 ± 0.00 a
GCG 390 ND ND ND ND ND ND 0.03 ± 0.00 b 0.03 ± 0.00 b 0.17 ± 0.00 a
ECG 180 0.06 ± 0.00 d 0.01 ± 0.00 g 0.03 ± 0.00 e 0.06 ± 0.00 d 0.02 ± 0.00 f 0.02 ± 0.00 f 0.57 ± 0.02 a 0.52 ± 0.00 b 0.47 ± 0.00 c
CG 170 0.01 ± 0.00 a 0.01 ± 0.00 a 0.01 ± 0.00 a 0.01 ± 0.00 a ND ND ND ND ND
Caffeine 500 0.39 ± 0.01 b 0.29 ± 0.01 c 0.26 ± 0.01 c 0.19 ± 0.00 d 0.06 ± 0.00 e 0.06 ± 0.00 e 0.36 ± 0.01 b 0.35 ± 0.00 b 0.48 ± 0.00 a

Different letters in the same column indicate significant differences between mean values (p < 0.05). ND means that the substance is not detected. The bitterness threshold of C, EC, EGCG, GCG, ECG, CG, and caffeine was cited from Xu et al. (8).