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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