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) 890 δ(C1–H) in glucopyranose ring 766, 629, 528 Pulse vibrations of pyranose ring