Table 2.
Polyphenol (mg GAE/240mL) content of loosely packed and bagged black tea after different brewing times
| Tea brand | Infusion time | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Tea bags | 1 min | 2 min | 3min | 4min | 5min | p-value * | |||||
| A | 23.98±0.01 | 23.64±0.01 | 27.06±0.01 | 36.40±0.01 | 71.92±0.01 | >0.05 | |||||
| B | 27.16±0.02 | 36.95±0.02 | 38.74±0.01 | 42.53±0.01 | 66.34±0.02 | >0.05 | |||||
| C | 13.30±0.01 | 18.890.02 | 19.26±0.01 | 26.07±0.02 | 31.10±0.02 | >0.05 | |||||
| D | 16.36±0.01 | 18.74±0.02 | 19.35±0.02 | 21.29±0.02 | 29.52±0.01 | >0.05 | |||||
| E | 17.53±0.01 | 17.90±0.01 | 18.34±0.02 | 21.97±0.01 | 27.31±0.02 | >0.05 | |||||
| F | 21.78±0.02 | 23.64±0.02 | 27.06±0.01 | 29.40±0.02 | 71.92±0.01 | >0.05 | |||||
| G | 23.98±0.02 | 24.64±0.01 | 27.91±0.01 | 31.45±0.02 | 69.73±0.01 | >0.05 | |||||
| H | 17.16±0.01 | 21.940.02 | 21.72±0.02 | 26.53±0.01 | 66.41±0.02 | >0.05 | |||||
| I | 13.30±0.01 | 18.89±0.01 | 19.26±0.02 | 26.07±0.02 | 31.10±0.01 | >0.05 | |||||
| J | 6.36±0.02 | 8.743±0.01 | 9.35±0.02 | 11.29±0.02 | 13.52±0.01 | >0.05 | |||||
| K | 17.53±0.01 | 17.90±0.02 | 18.34±0.01 | 21.97±0.01 | 27.34±0.02 | >0.05 | |||||
| p-value * | <0.001 | <0.001 | <0.001 | <0.001 | <0.001 | ||||||
| Infusion time | |||||||||||
| Loose tea | 5 minutes | 10 minutes | 15 minutes | 30 minutes | 60 minutes | p-value* | |||||
| A | 18.90±0.01 | 23.72±0.02 | 28.31±0.01 | 28.84±0.01 | 30.65±0.01 | <0.001 | |||||
| B | 19.21±0.01 | 27.31±0.01 | 27.76±0.01 | 33.84±0.01 | 34.69±0.02 | <0.001 | |||||
| C | 13.25±0.02 | 27.10±0.02 | 28.10±0.02 | 30.26±0.02 | 31.83±0.01 | <0.001 | |||||
| D | 18.39±0.01 | 21.70±0.02 | 24.60±0.01 | 25.92±0.02 | 33.59±0.02 | <0.001 | |||||
| E | 21.35±0.01 | 29.24±0.01 | 30.25±0.02 | 30.63±0.02 | 40.35±0.01 | <0.001 | |||||
| F | 17.90±0.01 | 22.71±0.02 | 27.80±0.01 | 29.16±0.01 | 40.68±0.02 | <0.001 | |||||
| G | 21.23±0.01 | 29.16±0.02 | 33.02±0.01 | 35.26±0.02 | 38.36±0.01 | <0.001 | |||||
| H | 18.54±0.01 | 22.46±0.02 | 23.65±0.01 | 25.13±0.01 | 34.08±0.01 | <0.001 | |||||
| I | 8.90±0.02 | 13.75±0.01 | 18.31±0.02 | 18.84±0.02 | 19.65±0.02 | <0.001 | |||||
| J | 19.21±0.02 | 27.3±0.011 | 27.76±0.02 | 33.84±0.02 | 34.69±0.02 | <0.001 | |||||
| K | 13.22±0.02 | 18.10±0.02 | 27.10±0.02 | 30.26±0.01 | 31.83±0.01 | <0.001 | |||||
| L | 18.39±0.02 | 20.70±0.01 | 21.60±0.02 | 24.92±0.01 | 33.596±0.02 | <0.001 | |||||
| M | 21.35±0.02 | 25.24±0.02 | 29.25±0.01 | 30.63±0.01 | 40.33±0.01 | <0.001 | |||||
| N | 17.90±0.01 | 22.71±0.02 | 27.80±0.01 | 29.16±0.02 | 40.78±0.01 | <0.001 | |||||
| O | 21.23±0.02 | 29.16±0.01 | 33.04±0.01 | 34.26±0.02 | 38.36±0.01 | <0.001 | |||||
| P | 17.42±0.02 | 22.46±0.02 | 23.65±0.02 | 24.13±0.02 | 34.08±0.02 | <0.001 | |||||
| Q | 15.02±0.01 | 17.69±0.02 | 21.72±0.02 | 26.32±0.01 | 27.80±0.02 | <0.001 | |||||
| R | 16.91±0.02 | 18.60±0.02 | 23.72±0.02 | 25.79±0.01 | 30.39±0.01 | <0.001 | |||||
| S | 16.54±0.02 | 24.47±0.02 | 24.92±0.01 | 29.48±0.02 | 30.22±0.01 | <0.001 | |||||
| T | 23.73±0.01 | 23.03±0.01 | 25.87±0.01 | 30.63±0.02 | 30.61±0.01 | <0.001 | |||||
| p-value * | <0.001 | <0.001 | <0.001 | <0.001 | <0.001 | ||||||
All analytical data are the mean of triplicate measurements of three independent samples ±SD.
*
p-value of one-way ANOVA for different brewing times.
**
p-value of one-way ANOVA for different brands.