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International Journal of Interdisciplinary Research

Table 5 1 H-NMR chemical shift (ppm) of the purified pink pigment

From: Extraction of Indigo dye from Couroupita guianensisand its application on cotton fabric

Peak no.

Position of1H

Chemical shift (ppm)

Comment

1

H-1

8.083

Sec. amide

2

H-6

6.966

1- benzene

3

H-7

7.338

1- benzene

4

H-8

7.145

1- benzene

5

H-9

8.916

1- benzene

6

H-5′

8.903

1- benzene

7

H-6′

7.025

1- benzene

8

H-7′

7.458

1- benzene

9

H-8′

6.884

1- benzene

10

H-1′

4.054

Aromatic C-NH