Comparison of the Level of Boron Concentrations in Black Teas with Fruit Teas Available on the Polish Market
Table 1
Information on the tea types, ingredients, origins for the analyzed tea samples, and the result of concentration of boron in cup of tea, fruit brew samples, calculated amounts of boron in tea infusion as three cups a day (200 mL/cup), and calculated percentage of the water soluble fraction of boron and the pH value for water extracts.
Sample
Type of tea
Composition of tea and ingredients
Origin
Tea weight per bag g
Concentration of boron in cup (200 mL) of tea and fruit brew
mg/200 mL
Calculated amounts of boron in tea infusion as three cups a day (200 mL/cup)
Calculated percentage of the water soluble fraction of boron
%
pH value for water extracts
1
Black
100% tea leaves
Kenya, India (Assam)
3.00
0.877 ± 0.115
2.630 ± 0.345
12.09
5.071
2
Black
100% tea leaves
Africa, India (Assam)
2.00
0.984 ± 0.057
2.951 ± 0.172
18.19
4.948
3
Black
Tea leaves with bergamot flavored. Lemon aroma. Gluten
India, Kenya, Ceylon
1.50
0.829 ± 0.041
2.487 ± 0.122
23.74
4.811
4
Black
100% tea leaves
India (Assam)
2.00
0.955 ± 0.020
2.866 ± 0.059
16.78
5.288
5
Black
100% tea leaves
China (Yunnan)
2.00
0.289 ± 0.009
0.868 ± 0.027
7.983
4.973
6
Black
100% tea leaves
Ceylon
2.00
0.893 ± 0.046
2.680 ± 0.138
15.45
6.27
7
Black
100% tea leaves. Bergamot flavor
NAa
2.00
1.144 ± 0.050
3.431 ± 0.150
24.21
4.653
8
Black
100% tea leaves. Bergamot flavor
Ceylon (region of Dimbula)
1.50
0.446 ± 0.017
1.338 ± 0.051
12.33
4.782
9
Black
100% tea leaves
Himalayas
1.40
0.621 ± 0.028
1.862 ± 0.083
22.79
4.567
10
Black
100% tea leaves
Sri Lanka
2.00
0.742 ± 0.024
2.226 ± 0.073
14.35
6.425
11
Black
100% tea leaves
India (Assam)
1.75
0.726 ± 0.034
2.178 ± 0.101
17.43
5.577
12
Black
100% tea leaves. Lemon peel
NAa
1.70
0.692 ± 0.031
2.077 ± 0.094
15.47
4.526
13
Black
NAa
NAa
1.75
0.454 ± 0.023
1.361 ± 0.070
15.61
4.903
14
Black
NAa
NAa
1.50
0.691 ± 0.040
2.073 ± 0.120
19.39
5.955
15
Black
NAa
NAa
1.50
1.346 ± 0.080
4.037 ± 0.241
26.56
4.882
16
Black
100% tea leaves
India (Assam)
1.30
1.029 ± 0.034
3.086 ± 0.101
23.24
6.887
17
Black
100% tea leaves
Sri Lanka
1.75
0.921 ± 0.040
2.763 ± 0.121
16.32
4.737
18
Black
100% tea Leaves. Bergamot flavor
Indonesia, Kenya, Sri Lanka
1.40
1.091 ± 0.051
3.274 ± 0.153
21.80
4.62
19
Black
NAa
NAa
1.40
0.757 ± 0.028
2.270 ± 0.085
20.30
4.866
20
Black
NAa
NAa
2.00
1.171 ± 0.058
3.513 ± 0.174
22.73
4.505
21
Black
NAa
NAa
1.50
1.454 ± 0.064
4.363 ± 0.192
24.53
4.582
22
Black
NAa
NAa
1.50
0.953 ± 0.375
2.859 ± 1.126
26.95
5.829
23
Black
NAa
NAa
1.40
1.208 ± 0.054
3.624 ± 0.163
22.73
5.266
24
Black
NAa
NAa
1.40
1.145 ± 0.057
3.436 ± 0.171
23.26
5.047
25
Fruit
Tea leaves with strawberry flavor
Sri Lanka
1.50
0.725 ± 0.030
2.176 ± 0.090
17.41
4.765
26
Fruit
Tea leaves with strawberry flavor
NAa
1.40
0.887 ± 0.048
2.660 ± 0.144
24.65
4.578
27
Fruit brew
Hibiscus. Rosehip. Apple. Orange peel. Raspberry. Elderberry fruit
NAa
2.50
7.241 ± 0.368
21.72 ± 1.105
68.56
2.702
28
Fruit brew
Hibiscus. Chokeberry. Apple. Blackberry leaf. Rosehip. Flavors. Lemon peel. Orange Peel. Black Currant. Strawberry fruit 0.1%
NAa
2.00
3.031 ± 0.101
9.094 ± 0.302
42.50
2.641
29
Fruit brew
Hibiscus Flower. Wild rose 20%. Black currant 11%. Aronia 10%. Apple 9.3%. Orange peel 2%