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Green Tea Extract

 

 

 1.       Chemical Constituents of Green Tea.

The chemical constituents of green tea varies with climate, season, horticultural practices, and age of leaf. The active constituents in green tea are antioxidants called polyphenols. Among the polyphenols in tea is a family of compound called the flavanoids contains a substance called catechins. Major catechins present in the green tea are epicatechin (EC), epigallocatechin gallate( EGCG),epigallocatechins (EGC) and epicatechin gallate(ECG).

Figure 1: Major constituents of green tea

 

The yellow color in green tea infusion in mainly determined by the water soluble flavonols,which include kaempferol, quercetine, isoquercetin, myricetin, myricitrin, rutin, kaempferitrin,etc and flavones which include apigenin, isovitexin, vitexin, saponarin, vicenin-2,etc as well as their glycosides; besides the water soluble anthocyanin. Other polyphenols present in green tea are flavanols and their glycosides,as chlorogenic acid,coumarylquinic acid. Amino acid degradation in involved in the biogenesis of the tea aroma.

 

Table 1: Percentage of different chemical constituents presented in Green Tea. 1

 

2.       Specifications of Green Tea Extract

 

No

Product name

Total Polyphenols

Catechins

EGCG

Caffeine

Ash

%min

%min

%min

%max

%max

Conventional Series

1

TP98C

98

75

45

6

0.5

2

TP95C

95

70

45

10

0.5

3

TP90C

90

65

40

12

1

4

TP80C

80

60

30

15

1

5

TP70C

70

50

25

15

6

6

TP60C

60

40

20

12

10

7

TP50C

50

30

12

10

12

8

TP40C

40

20

-

8

15

9

TP30C

30

15

5

8

15

10

TP20C

20

-

-

5

20

11

TP98D

98

80

45

1

0.5

12

TP95D

95

75

45

1

1

13

TP90D

90

70

40

1

1

14

TP80D

80

60

30

1

5

15

TP70D

70

50

25

1

8

16

TP60D

60

40

20

1

10

17

TP50D

50

30

12

1

12

18

TP40D

40

20

-

1

15

De-bitter series

19

TP98DCL

98

80

45

1

1

20

TP95DCL

95

75

40

1

1

21

TP90DCL

90

70

35

1

1

22

TP80DCL

80

65

30

1

2

23

TP70DCL

70

50

25

1

2

24

TP60DCL

60

40

20

1

2

25

TP50DCL

50

30

12

1

2

26

TP40DCL

40

20

8

1

3

27

TP30DCL

30

15

5

1

3

28

TP98CL

98

75

40

6

1

29

TP95CL

95

70

40

10

1

30

TP90CL

90

65

35

12

1

31

TP80CL

80

60

30

15

2

32

TP70CL

70

50

25

15

2

33

TP60CL

60

40

20

12

2

34

TP50CL

50

30

12

8

2

35

TP40CL

40

20

8

5

3

36

TP30CL

30

15

5

5

3

High caffeine series

37

CF40




≥40

25

38

CF20




≥20

25

High purified EGCG

39

EG95DCL



95

1

0.5

40

EG90DCL



90

1

0.5

41

EG80DCL



80

1

1

42

EG70DCL



70

1

1

43

EG60DCL



60

1

1

44

EG50D



50

1

1

                    C:Conventional products with normal caffeine content

                    D:Decaffeinated products,caffeine content <1.0%

                    DCL:Decaffeinated,caffeine content <1.0%.Refined product with less bitter,high clarity,good transparency,good flavor and taste.

                    CL:Refined product with less bitter,high clarity,good transparency.good flavor and taste.

                    EG:High EGCG series

                    CF:High caffeine series

 

 

Reference:

1.Anand J,Rai N,Kumar N,Gautam P, Green Tea:A Magical Herb with Miraculous Outcomes,Rai Nishant et al.IRJP 2012,3(5)