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Table 1 Chemical indicators of tea-leaves in modern and ancient tea plantations, respectively

From: HPLC and high-throughput sequencing revealed higher tea-leaves quality, soil fertility and microbial community diversity in ancient tea plantations: compared with modern tea plantations

Item

Modern tea plantations

Ancient tea plantations

Mean (n = 5*5)

Rang

Mean (n = 5*5)

Rang

Water extraction (%)

49.74 ± 2.65

48.65 ~ 50.84

50.82 ± 2.09

49.96 ~ 51.69

Free amino acids (%)

2.81 ± 0.36

2.65 ~ 2.96

3.43 ± 0.30***

3.31 ~ 3.55

Tea polyphenols (%)

29.47 ± 1.44

28.87 ~ 30.06

30.83 ± 1.77**

30.10 ~ 31.56

Polyphenols/Amino acids ratio

10.74 ± 2.03

9.90 ~ 11.58

9.08 ± 1.23***

8.57 ~ 9.59

Caffeine (mg g− 1)

40.21 ± 3.93

38.59 ~ 41.83

42.78 ± 3.33*

41.40 ~ 44.15

Gallic acid (mg g−1)

0.09 ± 0.18

0.01 ~ 0.16

0.56 ± 0.11***

0.51 ~ 0.60

C (mg g−1)

15.74 ± 4.94

13.70 ~ 17.78

13.85 ± 5.45

11.60 ~ 16.11

EC (mg g−1)

28.34 ± 7.60

25.20 ~ 31.47

30.10 ± 10.33

25.84 ~ 34.36

EGC (mg g−1)

18.20 ± 5.45

15.95 ~ 20.44

30.47 ± 3.52***

29.02 ~ 31.93

ECG (mg g−1)

85.66 ± 19.44

77.64 ~ 93.69

75.04 ± 20.66

66.51 ~ 83.57

GCG (mg g−1)

5.45 ± 1.50

4.83 ~ 6.07

4.35 ± 1.78*

3.61 ~ 5.08

EGCG (mg g−1)

53.40 ± 6.28

50.81 ~ 55.99

44.92 ± 4.70***

42.98 ~ 46.86

Total catechins (mg g−1)

200.79 ± 35.87

191.98 ~ 221.60

198.74 ± 37.51

183.25 ~ 214.22

Non-ester catechins (mg g−1)

62.28 ± 16.70

55.38 ~ 69.17

74.43 ± 15.51*

68.02 ~ 80.83

Ester catechins (mg g−1)

144.51 ± 22.38

135.28 ~ 153.75

124.31 ± 22.91**

114.85 ~ 133.76

Non-ester/ Ester catechins ratio

0.43 ± 0.09

0.39 ~ 0.46

0.60 ± 0.05***

0.57 ~ 0.62

  1. Note: Polyphenols/Amino acids ratio = Tea polyphenols content/ free amino acids content; Total catechins were the summation of C, EC, EGC, ECG, GCG and EGCG contents; Non-ester catechins were the summation of C, EC and EGC contents; Ester catechins were the summation of ECG, GCG and EGCG contents; Non-ester/ Ester catechins ratio = Non-ester catechins content/Ester catechins content
  2. And all data were present by mean value ± standard deviation. The range was the mean value at 95% confidence coefficient. Significance difference levels: * P < 0.05; ** P < 0.01 and *** P < 0.001 determined by the independent-samples T-test using SPSS 20.0 for Windows