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International Journal of Interdisciplinary Research

Table 3 Functional groups of purified pink pigment from FTIR Spectra

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

Wave number (cm−1)

Functional group with mol. motion

Purified pink pigment

3500-3300

Amines N-H stretch (1 per N-H bond)

3319.26

2950-2800

Alkanes C-H stretch

2945.10

2950-2800

Alkanes C-H stretch

2831.31

1440-1400

Carboxylic acids (O-H bend)

1444.58

1200-1025

C-N stretch (alkyl) Amines

1114.78

1200-1025

C-N stretch (alkyl) Amines

1022.20