Apparent B₁₂

Alkali-resistant factor

Corrected B₁₂

(µg/100g dry weight)

Pu’er tea leaves

Sample A

1.94

1.32

0.62

Sample B

1.75

1.5

0.25

Sample C

2.55

1.86

0.69

Sample D

1.53

1.05

0.48

Sample E

2.35

1.77

0.58

Sample F

1.52

1.07

0.45

Sample G

2.42

2.02

0.40

Ryubao tea leaves

Sample H

2.94

1.57

1.37

Fu tea leaves

Sample I

1.87

1.30

0.57

Brick tea leaves

Sample J

0.74

0.61

0.13

Mean ± SD

1.96 ± 0.63

1.41 ± 0.43

0.55 ± 0.33