Table 5 The comparison of 1H-NMR and 13C-NMR spectra of the VC compound and the reference.

From: Optimization of extraction and structural characterization of bioactive compounds from Musa balbisiana peel

Carbon No

VC compound

Assignment

Reference37

δ13C (ppm)

δ1H (ppm, multiplicity, J in Hz)

δ13C (ppm)

δ1H (ppm, multiplicity

C-1

38.05

1.18–1.35 (m)

CH₂ (ring methylene)

39.0

1.02–1.57 (m)

C-2

26.94

1.64–1.81 (m)

CH₂ (ring methylene)

28.1

1.82

C-3

76.82

4.27 (dd, J = 10.0, 4.8)

CH (hydroxylated methine)

78.2

3.44 (dd)

C-4

38.38

–

Quaternary carbon

39.4

–

C-5

54.79

0.90–1.15 (m)

CH (tertiary)

55.9

0.88 (dd)

C-6

25.59

1.25 (m)

CH₂

18.8

1.36–1.58

C-7

32.82

1.22–1.34 (m)

CH₂

33.4

1.36–1.53

C-8

38.87

–

Quaternary carbon

39.8

–

C-9

47.08

2.76 (m)

CH (tertiary)

48.2

1.71(tr)

C-10

36.60

–

Quaternary carbon

37.4

–

C-11

23.36

1.81 (m)

CH₂

23.8

1.96

C-12

121.05

5.16 (t, J = 3.7 Hz)

Olefinic CH

122.6

5.15 (tr)

C-13

143.83

–

Olefinic quaternary carbon

144.8

–

C-14

40.80

–

Quaternary carbon

42.2

–

C-15

27.20

1.20–1.80 (m)

CH₂

28.4

1.12–2.19

C-16

22.61

1.96 (m)

CH₂

23.8

1.96–2.12

C-17

45.68

–

Quaternary carbon

46.7

–

C-18

41.32

2.99 (tr)

CH (tertiary)

42.1

3.3 (dd)

C-19

45.45

1.80–1.83 (m)

CH₂

46.6

1.32–1.83

C-20

30.39

–

Quaternary carbon

31.0

–

C-21

33.31

1.40–1.55 (m)

CH₂

34.3

1.23–1.46

C-22

32.41

1.58–1.65 (m)

CH₂

33.2

1.82–2.04

C-23

28.23

0.90 (s)

CH₃

28.8

1.24

C-24

16.85

0.88(s)

CH₃

16.5

1.02

C-25

15.09

0.68 (s)

CH₃

15.6

0.93

C-26

18.01

0.88 (s)

CH₃

17.5

1.04

C-27

25.59

1.09 (s)

CH₃

26.2

1.30

C-28

178.55

12.02 (s)

COOH (carboxylic acid proton)

180.0

–

C-29

32.09

0.72 (s)

CH₃

33.4

0.97

C-30

22.90

0.86 (s)

CH₃

23.8

1.02

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