Table 9.

FTIR frequencies and intensities of the mango pectin functional groups.

Frequency (Number of bands, cm−1)	Functional groups	Intensity
3600–2500	O–H stretching	broad, strong
3000–2800	C–H symmetric stretch, asymmetric	Acute, occasionally double overlap with O–H
1760–1745	C=O esterified	Strong
1640–1620	COO- asymmetric stretch	Strong
1200–950	Main chemical groups in polysaccharides	Carbohydrate fingerprint