Table 1: Absorption band maximums in IR spectra of PS and their assignment.

Frequency ( , cm−1)Assignment

3460 (OH), (H2O)
3260 (NH)
2962, 2872 (CH3)
2573 (OH),
1730 (C=O)B COOH
1640 (OH)λ
1540 (NH)
1380–1450 (C–CH3), (C–O) pyranose rings
1331 (OH) in pyranose rings
1265 (C–O) in esters
1150 (C–O–C)
1095 (C–C)
1027 (C–OH)
890δ(C1–H) in glucopyranose ring
766, 629, 528Pulse vibrations of pyranose ring