Table 2.

Identification of papaya fiber parameters.

Wavenumber (cm−1)				Designations
Water. Ext	2.5%NaOH	5%NaOH	7.5%NaOH
3342	3339	3324	3334	Elongation of -OH from hemicelluloses and O-H from cellulose
2920	2915	2913	2900	C-H and CH2 stretching of cellulose
1731	1731	1731	1731	Symmetrical C=O extension of hemicelluloses and pectins
1625	1593	1593	1593	Shearing of the -OH bond in free water
1507	1507	1506	1506	Symmetrical C=C stretching of lignin
1317	1262	1264	1317	CH and C-O stretching vibration in the ester (cellulose and hemicellulose)
1029	1026	1025	1027	Elongation vibration of OH and C=O bonds in cellulose.
898	898	897	897	Symmetrical stretching of the CH and O-H bonds in cellulose.